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Патент USA US2404465

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‘ July 23,1946.
E. v. sTATlA, sà
2$404,465 '
RADIUS*l TO TANGENT COMPOUND ANGLE DRESSER
ATTOENE J
`
July 23, 1‘946.
E. v. sTA'rlA, sR
2,404,465 Y
RADIUS To TANGENT 'COMPOUND ANGLE DRESSER
Filed sepia; 16,1943v
2 Sheets-Sheet* 2
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INVENToR.
»
Edwin )./Sfaí'z'a S7,
BY~
Arroz/vars.
y
` Patented July 23, 1946
^ 2,404,465*
UNIT-ED STATES PATENT ïoFPicEf_
.2,404,465I
fr`
Y
RADIUS 'ro TANGENT coMîPoUNii ANGLE
f
nimssnnf~
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Edwin AVance' Statia, Sr., Royal OakpMich., as- v»
ì‘
signor of one-half to Edward L. Chapman,`De-.,
troit, Mich.
' Application September y16, 1943, Seria! No.V 5027,63? ’
The present invention relates to angleV to tan- ' ` 4
faces cna compound angle.
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following `description ofthe accompanying draw
~
ings,
and the resultant loss of time.
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wherein:
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Figure 1 is a top plan view of the improved
The primary object ofthe invention isr to pro“-l
vide a grinding wheel dressing tool which may
be easily adjusted to position the cutter for move
ment on a projected compound angle without
necessitating the use of extensive computation
kOther objects and advantages of the-¿invention
~ will. become apparentduring the cou-rse of the
gent radius dressers, and, more particularly, to av
dresser which may be positioned for dressing sur
radius to tangent compound dresser illustrating s
theV various parts and the arrangement thereof;
Figure 2 is a longitudinal cross-sectional viewfA '
taken on line 2_2 of Figure ljlooking in the di
10 rection ofzthe arrows `andv illustrating in detail
Another object ofthe invention is t0 provide a
radius tangent dressing tool for grinding wheels i
which is extremely accurate and is. particularlyv
adapted for high precision work.
various. structural features» ofl the radius to tan-l
gen-tzçompound angle dresser;
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« Figure 3 is a side elevational view of the radius
to tangent »compound` anglek dresser illustrating
- Another object of the invention is to provide a 15 the same positioned adjacent a grindingwheel
dressing tool for grinding wheels whereby the
surface of the wheel may be accurately vtrued or
dressed on various compound angles Iby unskilled
withthe cutter presented to the~` operative face
thereof showing the manner> in which theycutter
will movefwith `respect to thel grinding Ywheel to
produce an angular surface thereon of apre
labor or others not having highlyA skilled or tech
„
~
nical training whereby the grinding wheel sur 20 scribed- compoundv angle;
l Figure 4 is a front elevational View of the radius
face' will be conditioned to compensate for irregu
to tangent angle dresser showing the same in
larities in work pieces resulting in the projection
position with respect. to a grinding wheel for
thereof.
v
Heretofore it has-been common practice to po
sition grinding wheel truing devices and dressers
dressing the surface on a horizontal plane; »
so that the cutter will movev onra projected com
piece which is formed by a particular grinding
wheel having predetermined angular faces
pound angle by tilting the base of the dresser and
inserting J ohannson or Hoke gauge blocks under
the base to produce the necessary compound angle
'
Figure 5 is an end elevational view-of a Work
thereon;
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Figure 6 is a side elevational view of a work
and the movement of the dressing cutter on said ' ' piece diagrammatically illustrating the use there
angle, the dresser cutter is positioned by height
of under certain conditions; and
Figure 7 is an isometric cross-sectional lView of
a grinding wheel having angular surfaces pro,
duced by positioning the radiusI to tangent dress
gauges and the' like and various other measure- » ‘
ing cutter on a projected compound angle.
ments are made in addition to the positioning of
the base by means of gauge blocks, so` that ex
illustration like reference characters will be ein-
angle'. In various pieces of work requiring the
grinding wheel to be dressedy so that the work
produced therefrom will be of a predetermined
tensive arithmetical calculationsv andy computa
In the drawings, wherein for the purpose of
ployed to designate like parts throughout, atten
tions are necessary in order to arrive at the' de
sired setting or angle of the dressing cutter move
ment.
The above practice is objectionable in that* it `
tion is iirstwdirected to Figures 1 to 4 inclusive
-‘wherein the reference character 5'will generally
be employed to representa base having a sub
stantially flat surface plate 6 secured tc the bot
consumes considerable time and requires highly
skilled and trained mechanics in determining the
tom wall thereof by means of screwsor the like ¿
proper positioning of the dressing cutter to pro
duce the desired projected compound angle'. By
providing a dressing cutter as set forth in' the
as at 1'. The base ‘5 is substantially rectangular
and Yincludes a thick body portion 8 having-'a top
surface which is likewise relatively ñat.
j
One corner portion of the base 5 has integrali
' formed therewith an upstanding support Shaving
present invention, the above’ objections and dis
a reinforcing web l0 interconnectingthe stand
advantages are overcome and a dressing cutter
is provided which willï eliminate the use of gauge 50 ard 9 and base 8. The upper portion of the verti
blocks and various other gauges'to »position the'
dresser cutter to move in a projected> angle with
out necessitating the useY of arithmetical compu
tation and without sacrificing the precision’oi
the work produced.
_
i
cal standard 9 is formed with a cylindrical bearing
as at -Il which is provided with a horizontal bore
I2 for receiving a supporting member.
_
The supporting member _comprises a ltubular
sleeve-like member I3 having a circular oir-set
2,404,465
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i boss I4 adapted tov abut the cylindrical bearing
theccutaway portion 44 and between the bevelled ' '
p portion I'I of the vertical standard 9 as is clearly
1 shown in Figure l. Formed vintegral with the
slide guides Y45.
ì circular offset boss .I4 is a stub shaft I3a, Yhaving
is a control shaft 56 having an'enlarged head ì
'
.
Rotatably mounted in the elongated sleeve 22
portion 5I 'at one end thereof which is'adapted
Vto slidably operate in an enlarged bora-portion
52 at. one end 'of the elongated sleeve bore 53.
ï the outer end thereof screw-threaded as at léa »
for receiving a locking nut or the like as at I5.
" The locking nut is provided with circumferen
The other end of the control shaft 56 has secured
î tially spaced notches I6 for receiving a tool or
thereto'a collar 54 by means of a set screw 55
; the liketo facilitate tightening ofthe nut uponY
îthe threaded extension I4 and thereby lock the 10 n'andVY formed on said collar is a hand wheel 56
‘ tubular `’supporting sleeve I3 in an adjusted posi- - ï having a knurled peripheral surface' similar to
; tion. The tubular support I3V is provided withY " the hand Wheel29. The hand wheel 56 is posi
tioned adjacent the hand Wheel 28' to facilitateïV v
‘ an offset sector-shaped boss I1 having a hori
, à Zontal bore I8 for receiving' a reciprocating lock-`
i >ing pinV I9 one yend of which islenlarged as at 26
15S
while -the opposite end is knurled as at 2l to pro
. vide a finger-grasping portion.
manipulation of the rotaryhead in two directions
in a mannerwhich is shown inv my co-pendlng
application Serial No. 459,860, filedK‘S'JeptemberY
Thefsliding pin ;.. 26, 1942, patented December 14, 1943, under No. '
ï I9 is adaptedto provide a limiting stop for .the .
A coil spring 51 encircles one end of the shaft
50 and is received in the enlarged -bore 52 so that
one endthereof will abut the enlarged head 5I
`Rot'atably mounted in the bore of the tubular
and project the samev in the direction. of the
1 support I3 is anelongated sleeve 22 having al cir
rotary head 29. The enlarged head '5I is provided
i cular flanged portion 23V at one end thereof abut
with a series of gearteeth 58 adapted to‘mesh
ting one end of the tubular support I3 while~the
opposite end is threaded» as at 24 for receiving an 25 with a rack bar 59 secured in a chamfered por
` dresser head in a manner which .will be morev 'i
` fully described hereinafter.
'
tion .69 of the vadjustable rotary head 43 ,so that '»
rotation of the shaft 50 as by means of the hand
wheel 56 will cause said pinion 58 to mesh with
the gear teeth on the rack'bar 59 andv thereby
internally threadedlocking collar 25 having dia
` metrlcally opposed recessesY 26 for the reception
` of a Spanner ‘wrench to facilitate tightening of
the threaded collar 25 and the retention of the
i elongated sleeve 22 in position'. The extreme free 30 slide the adjustable rotary head 43 diametrically
of the axis of the control shaft 56 and along the
1 end of the elongated sleeve 22 is slightly reduced
` in diameter for receiving'a collar 21 upon which
f is integrally formed Y a handA wheel 28 knurled
slide guide 42.
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The adjustable rotary head 43 is provided with
j around its circumference to provideahand grasp " ' a bore 6I in axial alignment with the control
35V shaft 50 and said bore is provided with a recess
i surface.Y
62 having a bevelled portion 63 for the reception
A` disk-shaped head 29 is secured to the flange
of an integral projection 64 formed on the =en- .
` 23 of the elongated sleeve `22 by means of boltsl
l or the like as at 36 circumferentially spaced about
larged head 5I. The coil spring 51 normally
urges the projection 64 into the bevelled recess
63 to lock the adjustable rotary head 43 in axial
l the axis of the elongated sleeve and said head V29
‘ is provided with an annular recess 3| having an Y
alignment with the head 29, elongated sleeve 22
overhanging _flange 32 spaced from vthe'circular
` flange 23 to provide a restricted >circumferential
. slot 34. Slidably mounted in the annular groove
'
3| is the head of an arcuately shaped stop mem
ber 35 having a threaded portion for the recep
_ tionofa nut or the like to retain the stop in place.
The free end of the slot projects into the path
` of the enlarged head _20 on the slidingvpin I9 to
p facilitate limiting rotation of the head 29_ about
l a predetermined‘arc. The rotary head 29 is pro
" 1 vided with a drum portion 36 having a series of
circumferentially spaced graduations 31 which
I are adapted to register with Vernier graduations
`38 on an xarcuately curved plate 39 havingY av
. flange portion êßìwhich is attached to the offset
ï sector-shaped boss I1 bymeans of screws or the. >
. like as at 4I.
The rotary head asis _provided with a diamet
rical slide guide 42 upon which is slidably mount
and control shaft 56.
The adjustable rotary head 43 is provided with
a dovetailed vslide guide 65 upon which is slidably
mounted a'tool-carrying block 66 having'ways
61 similar to the >ways 42. ‘The tool carrying
block 66 is provided with an axial extension 68
havinga central bore 69 for receiving a diamond
cutting tool 10 having a diamond cutting point 1 I.
It is to be noted that the circular portion II
of the vertical standard 9 is graduated as at‘ 12
in degrees and Vernier graduations` 13 may be
provided on the offset circular boss I4 to reg
. ister- with said graduations `12 thereby facilitat
ing angular adjustmentof the supporting col
lar I3 with respect to the horizontal so that in
addition to the angularity of the adjustable head
43 the axis thereof may be tilted _to project a
compound angle by tilting the supporting co1
`ed an adjustable rotary head 43 movable dia 60 lar I3 the required amount. A set screw 14 lis
threaded in the tubular support I3 and is pro
` metricallyßover the >axis of rotation of said elon
vided at its outer end with a knurled thumb
` gated sleeve 22. The adjustable rotary head 43
piece 15 to facilitate locking the elongated sleeve
is cut away as at 44 for receiving finely machined
22 in an adjusted position to prevent rotation
"bevelled strips 45, the bevelled edges of which .as
‘ at 41 being adaptedto cooperate >with the slide 65 of the head 29 and adjustable head43', after the »
rotary head 29 has been shifted to a predeter
i guide 42 and the complementarysurfaces thereon
mined position. It is to be understood that the
1 to provide a snug iit between the diametrically
locking screw 'i4 may be released when moving
. adjustable rotary head 43 and the rotary head
the
cutter 1I in an arcuate. path between the ‘
ï 29. The slide key guides 45 are retained in posi
1 tion'by means Vof screws or Ythe like 48 and may 70 limits of the stop members 20 and 35 so that the
head may be rotated by the hand Wheel 28 be
be adjusted from time to time to take up any
tween said limits while the hand wheel 56 is ro
wear between the bevelled surfaces of the slide
tated to shift said head from stations at the ends
' guide 42 andthe key guide strips 45.
If desired, ` `
Qshims 49 maybe positioned along the edges of ,75
of said limits.
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By reference to Figure 4 itwiu be see'n'that`r
no4-,4651
5è
the anglevto tangent~ radius dresserk is present
aline tangent to the diameter of the workï at
ed“‘ to a grindingfwheel16 mountedV on an arbor
an angle of Aapproximately '7` degrees, the'heat' is
11 andllheld in position by `a locking nut 18. The
reduced so' that the cutting» operation can` be Y
diamond' cutting> point 1I is`V presentedY tothe
peripheral surfaceV of thezgrinding wheel'1'6 to
trim` a straight surface; and’in this positionl of
of' the: angleA to tangent ndresser', the set screw
14 may be tightened-to `maintain the> rotary head
2-9-in a preset position.Y The knurled hand piece
58 Ais simply- operated` to move-the adjustable ro
carried» out at a much faster rate of speed and
close tov the; speed of the metal employed. When
thev tool '83 is thusv angled, the depth of the
groove- 85H as at 88 moves to the position shown
at 89» so that instead of a 90 degree angular cut,
one of approximately 84» degrees will result by
reason of the projection from the points 88 to
89. In other words, when the tool 83 is tilted
tary ‘head 43,' tubular socket 68l andv diamond
tool 'lvßfíinfa _straightline' path as~ illustrated by
the required» amount-for efficiency in thecutting
operation, the groove v85 is altered by a differ
the> dottedv line; Obviously ifit is desired to cut
a concave orl convex face on the grinding wheel
18,)they adjustablen head 43' is- positioned in cen
= enceof approximately 7 degrees so that the15> workVV 84` insteadof being cut with a 90 degree
teredy relationv with respect> tol the rotary head
groove will be out with a groove in which the
walls are’at an angle> relative to one another of
2|Í andthe' t'ool supporting slide- 68 is moved
tothe; desired amount to produce the curved
approximately 84 degrees.
Oviously, the angular walls 82 of the grinding
convex orv concaveA surfaces on- the periphery of
wheel> 19 must be~ ground or dressed'sc as to cut
the grinding wheel.
ar groove such> as is shown at 85 in a tool 83 at
an angle greater than 90 degrees so that when
the tool 83 is angled with respect to the work
above` or>A below the- axis of theY control shaft 58
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By reference to Figure 3v it will be seen that
the angle to tangent> radius dresser is present“
84, the prescribed angle will be cut therein with
ed to a grinding wheel 19 mounted on a suitable
spindle 88 and said grinding wheel is provided
with an angular peripheral surface 8| having
converging walls at an angle of approximately
90 degrees. The cutter of the dresser 1|` is po
sitioned at a pointY` directly below the> axis of
25
the walls thereof angled» exactly 90 degrees. f
Iny order to compensate for the differences
above, an angle is laid olf on the grinding wheel
'i9 as indicated~ by the lineal! equal to the angle of
inclination of the tool 83,» and the radius to tan
said grinding vwheel -19 Vto move in an angular 30 gent dresser is angledV as shown in Figure 3 to
cause thefcutter 1| tol move along the line z which
direction ofV approximately 45° corresponding to
intersects the linesa: and y in’Figure '7 so that
the: angular‘position of the head'43. By way of
insteadof the walls 82- thereof being at an angle
illustration, attention is directed to the project
of 98- degrees they will be cut on an angle greater
ed view> in Figure '74 wherein a grinding wheel
similarjto the grinding wheel 19 is shown with 35 than 90 degrees as shown by the dot and dash line
faces angularly larranged' at approximately 90°
98» in the projected section in Figure 7, Hence,
as atv 8-2Y which would beV the resultant angle of
the included angle between the walls 98 indicated
by the dot and» dash line will'be greater than.90
dress if the tool is moved on a 45‘l angle'with re
spect to the center line of the grinding wheel.
r degrees> so- that the tool 83 will be cut with a
In Figure? thel line‘œ‘represent's the Vertical ra 40 groove having a corresponding angularity when
on a flat surface. When the tool 83 is presented
dius-of the wheel„and~the‘line y~forms an in
cluded `angle therewith equal to» thev angle of
to the work 84 and tilted the required amount
for mostI efficient operationpthe difference of the
compensation which will hereinafter be more
tool tilt brings the groove to the exact amount
fully`r described». In the formation of certain
work‘ such-'as high speed- cutting tools; it is de 45 of Aangularity such as 90; degrees which is the an
gle of. the desiredv cut in the work 84.
sirous tocut Ya 'groove in- the tool-to form the
cutting edges> therefor and diverting from Fig
The aboveexamples are explanatory for all
angular positions of the rotary head 29 and in
ure 7 for a second 'and' referring to Figures 5
and 6, such >a tool isillustrated as at 83. Let it
setting the/angle to tangent radius dresser the
be supposed that a groove is to be cut in one face 50 support I3 may be adjusted by manipulating the
of the cutting tool 83 so that the metal removed
screw I5 so that the pointer 12 will register with
a graduation 13 corresponding to the angle of
from a piece of work 84 will have a correspond
ing configuration 0r shape to the angularity of
the cutting tool. In proceeding to form the
groove 85 extending the length of the cutting
tool 83, the piece of cutting tool steel 83 is placed
upon a surface table beneath the grinding wheel
19 so that by moving the surface table longitu
dinally beneath the grinding Wheel there will
tool tilt indicated in Figure 6. Of course, the
rotary head 29 would be adjusted in the case of
the above example to produce 90 degree related
walls 82 so that the 45 degree marking on the
graduations 31 would register with the Zero mark
adapted to be presented to the work 84. By
reasonV of the heat generated during the cut
ting operation of the tool which partly passes
into the work and into the tool steel, the cut
ter will stop cutting after a predetermined tem
perature is reached if operated above the sur
face speed of the particular metal. If the tool
steel cutter 83 is slightly angled with respect to
larity with which the tool 83 is presented to the
work 84. It is to be understood that the illustra-y
ing on the graduated plate 39 whereby manipu
lation of the hand wheel 56 would cause the ad
be out a groove such as is shown in the tool steel 60 justable head 43 to slide at an angle of 45 degrees
83 at 85 of the same shape and contour as the
with respect to the horizontal. It is to be noted
grinding Wheel and with the same relative ar
that the diamond point 1| of the tool 10 is posi
rangement or angularity between the walls 82
tioned directly under the axis of the supporting
shaft B8 so that the projected angular cut will
thereof. After the H. S. tool steel has been thus
formed along one wall with a 90 degree groove
be greater than 45 degrees by reason of the tilting
85 it is bevelled along' the top edgel as at 8B
of the grinding wheel dresser to a prescribed
to provide a backing ofi and an acute point 81
`amount in accordance with the tilting or angu
tions are exemplary of one particular angle, and
if desired, grinding faces may be produced on the
grinding wheel 19 which will form various other
shapes and sizes oi grooves with different angu
larly related cutting walls without necessitating
complicated mathematical deductions computedv
2.494,46@
3.
by the usual for-mulafor a projected angle onan `
radiusytol tangent vangle grinding„v_vheel-A
dresser, comprising a base adapted tocbe; posi- ` v
:cya ucoordinate axis Wherethe projectediangles
tioned on Vthe Work tablejof aV grinding n'fiachine,`
a support ¿ìourn‘alledv onfsaid base capable ro_f be_-.
ing 4adjusted >»about .a ,horizontal axis in close.
vention herewith .shown and Vdescribed'is to bey
proximityy to the grinding Wheelîof A,said grinding
taken as a `preferred embodimentlthereof and
machine, a rotatableÄtool'carrying headzcarried
that various changes in the shape, sizel and ar- ‘
by said support -for rotary movement on a tiltable
rangement of parts may bel resorted to Without
departing from the ‘spirit of the invention or the 1
axis at right angles to saidñrst-mentioned axis, a;
scope of the subjoined claims.
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1o sliding head carried by said rotaryhead movable
equals the square rootrof z2 plus y? plusraz.
4
It is to be understo'ôdthatîthe form of the v_in
over said axis and on both sides thereof, individual ‘
What I claim is:
.1. A radius to tangent angle grinding Wheel >
dresser, comprising a base adapted to be posi
control means for said heads to `>impart.rotary and;>
sliding movement thereto, a dressing _tool carried
by said slidable'head extending in the same plane.A ._
tioned on the Work table of a grinding 4machine, .
as said -grinding Wheel, and'indicating markings
a support swiveled on said base to swing aboutva
" on said support .registrable Withïgraduationson
saidy base so,l that the axis ofthe rotatable,toolJ '
i horizontal axis, said support being arranged yin-v
close relation to thegrinding Wheel of said grind
ing machine, a tubular control member journalled
' in said support and positioned in the same plane
` as said grinding Wheel, a rotary toolsupporrting
` head on said tubular control member movable
about the vaxis of said tubular control member at
right angles to the axis of said support, a sliding
head mounted on said rotary head, agrinding
l
carryinghead can be tiltedvto a predetermined.
angular positionV to. impart compound l' angular
29; movement to said dressing toolupon operationofA
either of said control means.
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4. .A~radius to tangent angle radius-dresser' for
grindingv/heels, comprising a. base adapted to be Y
supported on the work table of a grinding maf>
i Wheel dressing tool carried by said sliding head, 25 chine, an upright on said base having a bearingv
' portion at itsupper end lin close proximity to the
and a control _shaft extending through said tubu
,
v
grinding wheel of said grinding machine,`a tubu-Á
lar support journalled in said bearing portion~for
adjustment'about a; horizontal axis, a rotaryfhead>
carried bylsaidsupport to move _about anadjust-v
§ lar control member for imparting slidingmove
i ment to said sliding head whereby _said dressing
tool maybe moved in an oblique plane on a com
ï pound angle wheny the support is swivelled on its
able tiltable axis at right‘angles to said- ñrst-Inen-fî Y
tioned axis, a sliding tool carrying head mountedj
on'said rotary head, a dressing tool carried by
base to a predetermined angular position.
2.*A radius to` tangent angle grinding Wheel
dresser, Acomprising a base adapted to be posi
tioned on a grinding machine having a grinding
Wheel; a support swiveled on said base to move
said sliding head extendingparallel Withthe-last-y
mentioned axis and. .in.,the¿same' planeA as the
about- a horizontal axis,v a control sleeve mounted `
grinding Wheel-individual- control mechanism for-
in a borev in said support, a tool carrying head
secured to said sleeve to rotate about a tiltable and
adjustable axis at right angles to said first-men
tioned'axis, position indicating-markings on said 40
head and base for registry with indicating mark
ings on said support', aV sliding head mounted on
said rotary head movable diametrically across the
axis thereof, and tool carried by said sliding head ~ 45
extending- in the same plane as said grinding
wheel and arranged so that tilting of said support .
to a predetermined angular-position I' and sliding
movement of said sliding head will impartïmove- I
ment to said tool along a compound angular path.
saidrotary and. sliding heads, a ypairof indicate,
ing'markings onthe tubular support >for registry.
respectively» with graduation Ímarkings;V on said..
,rotary head and said. bearing portion of the--up-_¿> '
right, and locking devices for holding said'tubue-Y
lar support and -rotary head in.tilted.predeter-._`
mined angular positions whereby operation ot.
said control mechanisms to impart sliding 'move->
ment to said sliding head WillY cause said-dressing-l
tool to be moved in a resultant direction depends.
Y ing upon the component angular positions of5said(
tubular support and rotary head;
v ; EDWIN VANCE sTA'rIA', sa
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