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Патент USA US2403546

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July 9, 1945.
J. o. OLSEN ' -
Filed‘sept. 27, 1943
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July 9, 1946.
‘ 2,403,546
Filed Sept. 27, 1943
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July 9, 1946.
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Filed Sept. 27, 1943
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Patented July 9, 1946
Joseph 0. Olsen, Rockford, Ill., assignor to Barnes
Drill 00., Rockford, 111., a corporation of Illi
Application September 27, 1943, Serial No. 563,886
11 Claims. (01. 51_1s4.s)
The invention relates to the art of ?nishing
cylindrical surfaces and more particularly to the
honing art.
' ing machine and tool embodying the features of
the invention.
Figs. 2, 3 and 4 are side views of the honing tool
shown in di?erent sections of a cylinder bore in
The honing process, in which a cylindrical abra
sive tool and the work are relatively rotated and
process of being honed.
simultaneously relatively reciprocated axially, is
Fig. 5 is a vertical sectional view of the ?uid
distributing head associated with the tool.
employed extensively in ?nishing cylindrical sur
Fig. 6 is a sectional View taken in a horizontal
faces Where a smooth, true surface and a high de
plane substantially on the line 6-6 of Fig. 5.
gree of accuracy is required. This process is ca
Fig. 7 is a side elevational view of the honing
pable of ?nishing either internal or external 10
tool showing the location of the gauging mecha
nism’ associated therewith.
Fig. 8 is a sectional view taken in a vertical
.0001 inch being readily attainable. In order to
plane substantially on the line 8—8 of Fig. 7.
maintain such accuracy it has been necessary
heretofore to interrupt the operation frequently 15 Figs. 9 and 10 are sectional views taken in
horizontal planes substantially on the lines 9-—9
for gauging the size of the work, particularly as
and |0—-I0 of Fig. 8, respectively.
the desired ?nal dimensions are approached.
Fig. 11 is a horizontal sectional view of a modi
Such interruption substantially increases the ?n
?ed form of nozzle adjusting mechanism.
ishing time required and consequently reduces
Fig. 12 is a sectional view taken in a vertical
the productive capacity of the machine upon 20
plane substantially on the line l2-I2 of Fig. 10.
which the honing operation is performed. More
Fig. 13 is a graph showing the relationship be
over, a high degree of skill is required to gauge the
tween the spacing of the coolant discharge ori
work within the close limits referred to and the
?ces from the surface being honed and the pres
gauging is especially dif?cult when the internal
surface of cylindrical bores are involved. These 25 sure of the liquid coolant discharged through
such ori?ces.
considerations all contribute to increasing the
The improved gauging method may be carried
cost of the ?nishing operation.
7 ,
out with. various types of honing machines and
With the foregoing in view a general object of
tools for ?nishing either internal or external
the invention is to provide an improved method
cylindrical surfaces. For purposes of illustration
of and apparatus for gauging work in process of 30 theapparatus
for carrying out the method has
being honed whereby the size thereof may be de
been shown herein as constructed and arranged
termined with a high degree of precision at any
for the honing of internal cylindrical surfaces
stage of the honing operation and without in
such as cylinder bores. The particular machine
cylindrical surfaces to precise dimensions, accu
racy within limits as close as plus or minus
terrupting the operation whereby the machine
selected to exemplify the honing operation is of
time and labor required for ?nishing a workpiece 35 the type in which the honing tool is rotated and
is reduced to a minimum with a consequent re
simultaneously reciprocated relative to a sta
duction in the cost of the operation.
tionarily supported workpiece. It is to be under
Another object is to provide novel means op
stood, however, that the invention is not limited
erative to automatically gauge the work and pro
to use in ‘the particular environment shown but
vide a continuous indication of the size thereof,
is readily applicable to other types of machines
while the honing operation is in progress.
and honing tools. The invention accordingly,
Still another object is to provide novel means
embraces all modi?cations, adaptations and al
whereby a cylindrical bore may be quickly and
ternative constructions falling within the scope
accurately gauged for size throughout its entire 45 of the appended claims.
' Referring to Fig; 1 of the drawings, a typical
It is also an object of the invention to provide
machine for honing cylinder bores comprises a
an improved honing tool having novel work gaug
head l5 adapted to bereciprocated by a pres
ing means, incorporated directly therein.
sure ?uid operated actuator I6 of the cylinder
Other objects and advantages of the inven 50 and piston type. J ournaled in the head and pro
tion will become apparent from the following de
jecting from one face thereof is a spindle l‘! to
tailed description of the preferred embodiment
which a honing tool I8 is operatively secured by
illustrated in the accompanying drawings in
means of an elongated tubular driver Hi. The
Figure 1 is a fragmentary side view of' a hon
spindle I1, driver l9 and tool l8 are rotatably
driven by a motor M through suitable gearing.
The honing tool l8 may be of any preferred
type. Such tools ordinarily include a generally
cylindrical ‘body 2i (Figs. 1, 7, 8 and 12) having
a plurality of radially movable elongated abra
plug gauges in the work in alternate strokes of
the tool has been proposed, but has proven in
capable of operating with the degree of precision
required. Moreover, in apparatus of that type,
sive stones 22 assembled thereon in a circular
series. The abrasive stones are conveniently
best, are adapted only for gauging the extreme
the gauges are subject to excessive wear and, at
endsof the workpiece. Such apparatus, there
mounted in’ elongated carriers 23 ‘(Figs _8 and
fore‘, does not'disclose irregularities intermediate
12) which provide ‘rigid support 'for'the' stones
the ends of the work. The use of ' leakage path
and guide the same for radial movement in the
air gauges has been suggested to overcome the
tool body 2|. Annular springs '26 encircling the
latter di?iculty. Air gauges have been found
series of carriers yieldably urge the carriers and
unsatisfactory however, due to the necessity of
abrasive stones inwardly to a contracted posi
,maintaining the tool and work flooded with
liquid coolant.
In operation, the tool is expanded, that is, the
I have discovered that the above difficulties
carriers 23 and abrasive stones 22' are shifted 15
may be completely avoided by employing the
radially outwardly to force the working faces
liquid coolant as‘ the gauging medium and have
of the stones against the surface‘ to’ be ?nished.
provided the novel gauging method and appa
In the exemplary tool, the means for-effecting
ratus herein disclosed for utilizing that discovery.
such expansion comprises a pair of’ generally
conical cam members 25‘a'nd 25' slida‘ole but non
rotatably held within the hollow to'ollbody 2! for‘
coaction with adjusting plates 26 (Fig, 12)‘ asso
ci'a‘te'd' with the respective carriers 23. The cam
members are mounted in opp‘ositely'facing" rela
tion upon a shaft 21, the member 25 being rotat->
ably‘ anchored to one end of the" shaft while the
member 25' is threaded on the other end' of the
By'turning the shaft 27’ in one direction, the
cam' members 25 and 25' are moved toward each
other and ‘act through the plates 26 to shift the
carriers 23 and their abrasive stones 22 radially
outwardly. ‘ A spring 28' interposed between the
The improved method of gauging contemplates
the dischargev of the liquid’ coolant under pres—
sure through one or more restricted outlets de
?ned jointly by the work surface and members
40 carried by or movable with the honing tool
whereby the ?ow of liquid is restricted in accord‘
ance with the diameter of the’ work. Variations
in diameter may therefore be determined with
a high degree of accuracy by measuring changes
. in either‘ the volume’ or the pressure of the
liquid in the coolant system. In practice, I prefer' to supply a constant volume of the liquid‘
coolant to the tool and to determine size by
measuring the pressure in the coolant supply
cam members yieldably ‘urges themembers away
from each other when the shaft is turned in the
The members 40 coacting with the work sur-'
face to define the coolant outlets are preferably
opposite direction thus permitting the‘ springs 24
to shift the carriers and abrasive'stones' radially
inwardly‘ and thus‘ contract thetool.
,The shaft 2111s adapted to be turned by an
adjusting‘ rod 2.8 connected‘ to the" upper end of
the ‘shaft by a ?exible joint 29. The rod extends
axially through the driver to a point at which
it‘ may be‘ conveniently operated by an adjusting
sleeve 30 (Fig. 1)‘.
In honing a cylindrical‘ bore such as‘ the bore '
33 of a metal block or workpiece W' the‘tool i8‘
is" inserted therei'n‘in‘ a collapsed condition, that
is‘; with the‘ abrasive stones 22 ‘withdrawn in
w’ my so‘t‘hat the‘ overall diameter of the tool
is'les's" than the diameter‘ of the bore. After in
sertion the tool is expanded until the working
facesof the stones 22 are pressed against the‘
walls‘ ‘of the'bore. The stones are therefore‘ effec
tive to abrade or cut away the walls of the bore‘
when thé't'o‘oli's rotated and reciprocated therein.
_ ‘As'th'e‘ here is gradually enlarged by‘ the action’
of the‘ abr'asive‘stone‘s' 22; the tool is progressively
expanded to maintain the required working pres
sure ori the work. Throughout the entire opera
mounted directly on the ‘tool body.
These mem
bers, while adjustable relative to the tool, are
held in ?xed spaced relation during the honing
operation. The spacing may be adjusted ini
tially to’ provide a predetermined gap or outlet
between each member and the un?nished work
surface. Accordingly, the pressure in the cool
. ant supply system is at its maximum when the
tool is initially associated with the work, aslfor
example, when it is» inserted. in a bore of small
diameter. As the bore is progressively enlarged
due to the gradual removal of stock bythe tool,
the gaps between the work surface and the mem
bers 40 increase and the pressure drops corre-'
spondingly. Thus, as the honing operation pro
ceeds, the pressure gradually falls in accord
ance with the progressively increasing diameter
of the bore. It will be evident therefore, that'the
pressure of the liquid coolant provides an accu
rate indication of the diameter of the work at
the particular point- at which the tool isv
To establish a de?nite reference point for the
tion ‘the work and tool are flooded with a copious 60 accurate gauging of the work, the members 48
are preliminarily set by means of- a ring gauge 4|
supply of liquid coolant ‘which serves to ?ush
(Fig. 1) or the like having anlinternal diameter
away‘ metal and abrasive‘chips and to prevent
the tool‘ and work from becoming overheated.
In ?nishing cylindrical work’with‘in the close
limits demanded in precision honing, the honing
operation must ‘be terminated at‘ the precise in
sta‘nt‘that the desired ?nished diameter is at
tained. Thisv dimension can be determined with
the‘ required accuracy only'by'the actual gauging
or‘measurement of the work. Numerous attempts
have been made to develop automatic work gauge
ing means with a view of reducing the labor re
quired and“ avoiding the delays involved‘ in man
ual‘g'auging ‘as now‘ generally practised.
The‘ use‘o‘f automatic mechanism for inserting‘v
corresponding exactly to the desired diameter of
the ?nished work. With the members set-‘so that
they may be inserted in an un?nished bore, the
pressure set up by the gauge corresponds to the
pressure that will obtain when thefwork is ?n
ished to the desired size. Accordingly, the hon
ing operation may proceed without interruption
until the pressure in the coolant supply system
indicates that the desired dimension has been
attained. Moreover, localized constricted areas
or taper in the work are‘ indicated by appropriate
pressure changes in the coolant supply system
' thus‘ enabling the machine attendant to amplify
.the action of the tool in such areasby “short
stroking.” ,
. The apparatus for carrying out the improved
gaugingmethod may take various forms. In the
vpreferred embodiment illustrated the members 48
which, in cooperation with the work surface de
?ne the coolant outlets, comprise tubular nozzles
.42 supported on the body of the honing tool and
positioned to direct the coolant against the Work
the tips of the plungers so that in their limit posi
tions contact between the plungers and the work
surface is interrupted during the ?nal stages of
the honing operation. In this way any possibil
ity of the plungers marking the ?nished surfaces
is effectually avoided.
' vWhen the honing tool is used for removing
‘small amounts of stock, a single coolant outlet
may be used if desired. Moreover the automatic
surface. As herein shown two such nozzles are 10 centering plungers may be replaced by ?xed ad
located on diametrically opposite sides of the tool
justing screws 62 adapted to thread into the stop
plates BI and to bear against the tool body as
shown in Fig. 11. Thus by appropriate manipu
lation of the screws 62, the nozzles 42 may be
shifted toward or from the axis of the tool body
and accurately centered with respect to the
working faces of the abrasive stones.
erally rectangular metal block 43 _(Fig. 8) having
As stated heretofore, the supply of liquid cool
cylindrical mounting studs 44 and 45 projecting
ant is delivered to the nozzles 42 through the
from its upper and lower faces. The upper stud 20 distributor 50 which acts to provide a connection
between the rotating tool and a stationarily sup
44 is formed with an axial bore or passage 46
ported coolant source. As shown in Figs. 5 and
communicating at its lower end with the nozzle.
6, the distributor comprises a central body ‘H in
A coupling 41 threaded on the upper end of the
the form of a cylindrical enlargement of the
stud connects the passage 46 with a ?exible tube
driver I9. Vertical passages 12 in the body com
48 which has its other end connected by a
municate at their lower ends with the tubes 48
coupling 49 with a coolant distributor 50 carried
leading to the nozzles 42. Each passage 12 is
on the driver [9.
‘closed at its upper end by a plug 13 and it is
> Cooperating with the mounting studs 44 and 45
provided with a radially opening port 14 formed
to support nozzles on the tool body are a pair of
by a circumferential groove in the body ‘I l.
yokes 5| and 52. The yokes are of similar form,
Rotatably mounted on the distributor body ‘H
each comprising a metal plate having a central
is a sleeve 15 having an inlet opening 16 to which
aperture dimensioned to ?t loosely over the end
coolant is delivered through a pipe ‘IT. The inlet
of the tool body 2i and having laterally project
is alined with the groove forming the ports 14
ing arms apertured to receive the studs. The
whereby coolant is delivered to passages 12 dur-v
couplings 41 engage the upper face of the yoke
5| and act to clamp it rigidly against stop shoul
ing the rotation of the distributor body relative
to the sleeve 15 which remains stationary. To
ders 53 formed on the studs 44. Nuts 54 threaded
prevent endwise movement of the sleeve relative
onv the lower ends of the studs 45 clamp the lower
yoke 52 against stop ?anges 55 formed on the
to the distributor body, the sleeve is con?ned
studs._ Thus the nozzles are supported by a rigid 40 between a ?ange 18 projecting outwardly from
the lower end of the body and a collar 19 clamped
frame structure mounted for limited movement
to the body. ,
transversely of the tool body 2|.
Liquid coolant may be supplied .to the dis
Adjustment of the nozzles with respect to each
tributor 55 for delivery to the nozzles 42 from
other may be readily effected either by shifting
body so that the reaction from the discharge
tends to center them in the work. Additional
nozzles may be provided if desired to accommo
date a greater volume of coolant.
In the exemplary apparatus, each of the noz
zles 42 is ?tted into and rigidly secured to a gen
the studs toward or from each other in the yokes. -
any suitable source capable of delivering a sub
Alternatively, the nozzles may be readily replaced
stantially constant volume of liquid under pres
by nozzles of different length or shape or having
sure. As shown in vFig. 1, the coolant source com
prises a constant volume adjustable delivery vane
different size ori?ces.
To guide the nozzle supporting structure in its
pump P driven by an electric motor M—I. The
lateral movements, the tool body 2| is formed 4.1) pump is adapted to draw liquid coolant through
with radially opening recesses 56 adapted to
an intake line 19 from a settling tank or reser
voir R and discharge it under pressure through
snugly receive the inner ends of the nozzle sup
porting blocks 43 which have their side edges
a pipe 80 to which the pipe 11 is connected as
by a T-?tting 8|. A pressure gauge 82 is con
tapered as shown in Figs. 9, 10 and 11 to permit
them to ?t between the adjacent abrasive stone .55 nected with the other outlet of the ?tting 8| to
visually indicate the pressure in the coolant sup
carriers. Detents 51, herein shown as spring
ply system. Adjustment of the pump output is
pressed balls carried by the blocks 43, engage the
walls of the recesses to prevent undesired move
effected in well-known manner by means of a
manually operable adjusting member 83.
ment of the nozzle supporting structure.
Means is provided for automatically effecting 60
Before the gauging apparatus is placed in oper
the adjustment of the nozzles and associated sup
ation the nozzles 42 are initially adjusted so that
porting structure to center the nozzles in a bore
their outer ends are within but in close proximity
and maintain'this central position throughout
to the cylindrical path described by the working
the honing operation and thus compensate for
faces of the abrasive elements 22 in the rotation
‘uneven wear of the abrasive elements of the tool. 65 of the tool. The nozzles are therefore separated
The means provided for this purpose comprises a
by'a relatively small gap 90 from the un?nished
pair of plungers 58 slidably ?tted in recesses in
walls of the bore thus DI‘OVidiIlg a restricted out
the blocks 43 for movement radially of the tool
let for the ?uid discharged from thenozzles. The
body into engagement with the walls of the bore.
output of the pump ~P may then be adjusted to
Springs 58 acting on collars 60 integral with the 70 provide any desired pressure for the outlet thus
plungers urge the latter outwardly against the '
formed, the pressure being indicated by the gauge
bore walls. Stop plates 6| suitably attached to
the plates for engagement by the collars 60 limit
the outward movement of the plungers. In
practice, the collars 68. are spaced inwardly from 75
82. As stock is removed by the tool (increasing
the diameter of the work in the case of an internal
‘cylindrical surface and decreasing the diameter
in the caseof. an external cylindrical surface) the
Spacing-of the work: surfacefromithe- nozzlesin
a( substantial‘ contraction of‘ the here at that‘ point.
With these indications for guidance, tlielatt'endL
antimay- operate the machine in well-knownaim'an
creases thus increasing: the area of‘ thei'coolant
outletw'and-causing a pressure dropin the supply
system-1.. Thispressuredropprovides an accurate
indication of the change in the diameter of‘ the
ner to “short-stroke” the tool‘ within‘ thev con
strictedi'area‘until the diameter is substantially
uniform-throughout; the length of the bore.v _ The
t'o'oll may. then be traversed. axially of‘ the! bore
in‘ the usual way- until the honingxop'erati'on is
completed. When the desired?nal dimension-is
attainedlthe gauge 82v registers a pressure‘: of
that- is, with relatively.‘ large gaps between-the
twenty-'pounds per square inch‘ (Fig. 4'0- corre
nozzles- and‘ the work surface and at relativelyr
sponding exactly‘ with the indication given when
low‘ pressure will ordinarily be found most? satis
thehone is associated with the‘c'a'librating gauge
factory.‘ For. example, the nozzles maybe set. to
41- as shown in Fig-1i thus enabling-the attend
initial gap'of .015 inches between the
outer‘ end‘ of each nozzle and the Work surface 15 ant to terminate the‘ honing operations: city the
proper time.
and the pumpgdelivery adjusted'to produce a pres
It. will ‘be apparent‘ from the foregoing thatthe
sure in the system of approximately‘ twenty
invention provides ‘an, improved method. of game
pounds per square inch. With this setting, re
ingworkpieces in process of being'h‘onedv which
movalof' .OlQ inch of stock and the consequent
enlargement of the gap at each nozzle to .020 inch 20 permits? the Work- to: be ?nished‘ precisely to-d'e
sired dimensions‘W-ithout(interrupting the honing
Willi result in a pressure drop of approximately
operation. The time and- labor required for pre
ten pounds as indicated by the bracketed section
cision ?nishing of. cylindrical work by ‘honing is
X of thepressure curve shown in Fig. 13. In
substantially reduced thus increasing the produc
otherwords, under the conditions stated each
tive capacity of the machine used for performing
pound; variation in the pressure corresponds ap
the honing operation and correspondingly reduc
proximately to».00l‘inch of stock measured on the
ing the cost of the ?nishing operation.‘ Further
diameter of‘ the work.
more,v due to the constant visible gauging, over
For‘ high‘ precision ?nishing where relatively
size honing‘ of the-workis avoided thus elimi
little-stockisYremoved‘, greater sensitivity is ob
tained with a smaller outlet; that is, whenlthe 30 nating or substantially. reducing‘ spoiled or
scrapped work.
nozzles are set'closer to thework'surface and the
The. invention also-provides new and improved
pump adjusted for operationiin the higher pres
apparatus for carrying out the improved method
sure range indicated by.‘ the bracket Y‘ in Fig. 13.
oflgau'ging; In particular, theapparatus is de
Thusa-with an initial gap of‘ .007 inch between the
outer‘ end of eacnnozzle and the work surface 35 signedwto utilize ‘liquid coolant as the gauging
medium, thereby‘ adapting the ?uid gauging
and‘ with the pump adjusted to produce a pres
meth'odwfor usein the honing process which‘ re
sure of" seventy pounds per square inch in the
quiresa constant how of? liquid coolant over the
‘coolant supply system, an increase of .002‘ inch
tool and work.» It should be understood, however,
inzt'he spacing of the nozzles from the work sur
that the-gauging apparatus can be operated with
face-or an; increase of .094 inch in the work di
For roughlhoning, where a‘ substantial amount
of stock is to~be removed, operation?- of‘the gaug
ing-apparatus with outlets of substantial area,
ameter will result" in a pressure ‘change of ap
proximately twenty pounds per square inch. Ac
cordingly, much more accurate gauging may be
effected due to the relatively large pressure
liquidsother than. the coolant ordinarily employed
in honing provided such liquids do-not interfere
with theproper functioning of the coolant. As a
matter:v of convenience, the gauging apparatus
changes produced'by relatively small changes in 45 may be incorporated directly in" the tool.
The-improved apparatus is simple. and rugged
work diameter.
It will be understood, of course, that with either
in construction and yet adapted to provide'ex
tremely accurate measure ofth'ev work size. When
desired,'ia.continuous indication of size is available
calibrated initially with reference to a suitable
gauge. When used with an external honing tool, 50 thuslproviding. for accurategauging of a bore or
theilikerduring the'entire operation‘. Moreover,
a conventional cylindrical plug gauge is utilized
a.cylindricalworkpiecemay be gauged accurately
for this purpose. For apparatus used with an in
throughout its length with a minimum‘of effort on
ternal honing tool, the ring gauge 4! is utilized
type of- adjustment, the gauging apparatus is
as previouslyexplained. The honing operationiis
started'with a substantially higher pressure than 55
that produced‘ by the. calibrating gauge‘ and the
operation is continued until thepressure indicated
by the gauge 82' corresponds exactly with that
produced by the calibrating gauge. . It will also
theipart' of the operator ‘and Without loss of time.
While * the exemplary gauging method and ap~
paratuscont'emplates the discharge of‘ a constant
volume of liquid.v coolant. through the gauging
out'letswith: measurement of pressure variations,
it will berappreciated'that the pressure» of the
be understood that the gauging apparatus may 60 liquidcouldbe maintained constant andth'e varia
tionsrin; the.volume...of_ discharge measured in
be‘ calibrated to indicate actual diameters, if de
stead; In:either:case,ltheiarea of the outletsde
?ned bythe gauging member‘ and the work sur
The gauging apparatus above described is
face- affects; the flow‘ of liquidin a-‘manner' sus
adapted to accurately indicate any variations in
the‘ diameter of a bore at any point throughout 65 ceptibl‘e; ot accurate measurement. Accordingly,
its length. Thus when the tool is operating in a
theternr: “flow.” as used: herein'is' intended to
cylindrical bore having, a slight taper‘ developed
apply-‘to. either: mode'of.’ operation. \
I‘. claim; as myv invention:
in a preceding. operation, the pressure of the cool
1:.'.'Ahonin‘g.toolilhaving; in‘combination; a rigid
ant is low when the tool is located in the large
end'oi' the bore as shown in Fig. 2, a pressure of 70 body: supporting. a. circular‘ series-of elongated
fortye?ve pounds per square inch being indicated
on the gauge 82 in this instance.
As the tool is
moved downwardlyv to the. smaller end of the
bore the pressure. gradually risesto approximately
sixty . pounds ., as. shown. in _ Fig; . 3, thus . indicating
abrasive. elements,- nozzle supporting members
disposedon opposite sides of‘ the tool bodyg'studs
projectingfr'omrthe upper and'lower facesof- said‘
mem_bers,;and .apair of yokesconn'ecting said
studs "to; form‘ a: rigid ‘frame structure; saidto‘ol
body being recessed for the reception of said
members whereby to guide the frame structure
for movement radially of the tool body, and ad
justable means carried by said members coacting
with said tool'body to determine the position of
said frame structure with respect to the tool
and movable radially thereof for engagement
with the cylindrical surface of a workpiece, mem
bers mounted on said body for limited movement
as 'a unit transversely of the axis of the body,
said members :being adapted to coact with the
surface of the workpiece to de?ne a pair of out
lets located on opposite sides of the tool and
maintained substantially equal in effective area
2. A honing tool having, in combination, a rigid
body supporting a circular series of abrasive ele
by the unitary movability of said members, and
ments, nozzle supporting members disposed on ll.) means connecting said outlets with a source‘ of
opposite sides of the tool body, studs projecting
liquid under pressure.
from the upper and lower faces of the members,
8. In a honing tool in combination, a rigid
and yokes connecting said studs with the tool
body, a plurality of abrasive elements supported
body, one of the studs associated with each of said
on said body in a circular series and movable
members having a passage for conveying liquid to 15 radially thereof for engagement with a cylin
the nozzle supported by the member. I
drical work surface, a frame mounted on said
3. A honing tool having, in combination, a rigid
body supporting a circular series of'elongated
abrasive elements, nozzle supporting members
disposed on opposite sides of the tool body, studs
projecting from the upper and lower faces of said
members,.and a pair of yokes at opposite ends of
said tool body, said studs being rigidly clamped
to said yokes for supporting the members on the
tool body.
body for movement transaxially of the body,
a nozzle carried by said frame with its outlet
disposed in close proximity to the work surface,
means carried by said frame coacting with the
work surface to center the frame within the work
whereby to maintain uniform spacing of said
nozzle from the Work surface while the tool is
traversed through the work, and means connect
ing said nozzle with a source of ?uid under pres
4. A honing tool having, in combination, a rigid
body supporting a circular series of elongated
abrasive elements, nozzle supporting members
disposed on opposite sides of the tool body, studs
projecting from the upper and lower faces of
9. The combination with a rigid body adapted
to be traversed axially through a cylindrical bore,
of a plurality of nozzles spaced circumferentially
around said body for coaction with the surface
said members, and a pair of yokes connecting said
of the bore, and a frame supporting said noz
studs to form a rigid frame structure, said tool
body being recessed for the reception of said
zles in ?xed spaced relation, said frame being
mounted on said body for movement transaxially
members whereby to guide the frame structure
thereof to enable said nozzles ‘to be centered in
35 said bore irrespective of the position of the body
for movement radially of the tool body.
5. A honing tool having, in combination, a
therein, and means connecting said nozzles with
body, a plurality of abrasive elements supported
a source of ?uid under pressure.
on said body in a circular series, a pair of rigidly
10. The combination with a rigid body adapted
connected members mounted on said body for
to be traversed axially through a cylindrical bore,
limited movement transversely of the axis of the 40 of a frame mounted on said body for movement
body, said members adapted to coact with the
transaxially thereof, a nozzle carried by said
surface of a cylindrical workpiece to de?ne a
frame with its outlet disposed in close proximity
pair of outlets located on opposite sides of the
to the walls of said bore, a, plurality of circum
tool, spring pressed plungers mounted on said
ferentially spaced plungers mounted in said
members adjacent the outlets adapted to engage 45 frame and yieldably urged into engagement with
with the work surface to center the outlets there
the walls of the bore to maintain said frame sub
in, and means limiting the movement of said
stantially centered therein independently of the
plungers to interrupt their contact with the work
position of said body, and means connecting said
surface as the workpiece approaches its ?nished
nozzle with a, source of ?uid under pressure.
11. The method of gauging a cylindrical bore
in process of being operated on by a honing tool
6. A honing tool having, in combination, a body,
a plurality of abrasive elements supported on said
which comprises, traversing a plurality of cir
body in a circular series, a pair of members
cumferentially spaced nozzles axially of the bore
mounted on said body and rigidly connected to
with a honing tool, discharging a constant vol
gether for limited movement transversely of the 55 ume of liquid coolant through said nozzles against
axis of the body, said members being adapted to
the walls of said bore, measuring changes in the
coact with the surface of a cylindrical workpiece
pressure of the liquid to detect changes in the
to de?ne a pair of outlets located on opposite
restrictive action of the bore walls upon the dis
sides of the tool, and means operative automati
charge of the liquid from said nozzles, and main
cally to center said members with reference to 60 taining said nozzles substantially centered in the
the workpiece.
:bore irrespective of the position of the honing
7. A honing tool having, in combination, a
tool therein.
rigid body, a plurality of elongated abrasive ele
ments supported on said body in a circular series
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