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Oct 1, '1946-_
‘D.T. E. FIELDING
_- 2,408,618 -
MA-QHINE FOR GRINDING‘ DRILLS AND SIMILAR TOOLS
Filed Aprii 15," 1945
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ATI'ORNEYS
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Oct. 1, 1946.
‘2,408,61 8
D. T. E. FlELDlNG
MACHINE FOR GRINDING DRILLS AND SIMILA‘R TOOLS
vFiled April 15, 1945
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~2,408,618
MACHINE FOR GRINDI'NvGv‘D-RILLS AND SIMILAR TOOLS Filed Api~i1 15, 1945
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ATTORNEYS ‘
Patented Oct. 1, 1946
2,408,618 '
UNITED STATES PATENT OFFICE
' David Thomas Edward Fielding,’ Middleton Junc- »
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tion, England
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Application' April 13, ‘1945, Serial No. 588,158‘ v i
In Great Britain May 15, 1944 a
_ 1 Claim.
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(01. ale-1219i
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This invention relates to improvements in ma " 1 means for securing the tool in its supporting
chines for grinding twist drills and similar tools
_ In. the form of the invention illustrated in the
of the kind in which the tool is passed across the
carriers.
face of the grinding wheel.‘
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is mounted on a horizontal shaft so that its 1 A
bracket mounted on a pivot carried by a second
bracket so that it can be moved?to bring the
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drawings the grinding wheel A is driven directly
from the electric motor B being secured‘on the
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According to the invention the grinding wheel
grinding face is vertical and the tool is supported
at a suitable angle to the grinding face by a
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end- of the shaft b thereof. , The motor B is-a?ixed
to a slide C7 mounted in horizontal guides c on the
frame D. The slide’ C and with it the motorB
and grinding wheel A, is moved towards the tool
A1 by a cam or eccentric c1_ actuated by a handle
0"! against the pressure of a return spring 03, the
movement of the cam 01 beyond its maximum
throw being prevented‘ by the stop 04. The cam
tool into various positions relative to the grind
ing face when grinding clearances on the cutting
edge such as the cutting edge clearance and
c1. acts on the head of a screw 05 in the end of
additional clearance‘ behind the cutting edge
clearance and for thinning the drill .point,.the 15 the slide Cand affixed therein by the set screw
c". The forward position of the grinding wheel A
second bracket being pivoted on a third bracket
can be variedv by varying the distance which the
so that it can pivot in a vertical. plane to move
head of the screw 05 projects from the rear of
the tool in an arc acrossv the grinding face and
the slide C thus allowing the wheel A to be ad
the third bracket being mounted on the frame
of the machine so. that it can be moved verti-. 20 justed asits grinding face a becomes worn.
The tool supporting‘ bracket _E is mounted on a
cally to adjust the height of the tool supporting 1
vertical pivot .f carried by‘ a second bracket F.
bracket to suit various sizes. of tools and bring
so that it canbe moved in a vertical plane to vary
the axis of the tool to be ground into the correct
the ‘angle of the cutting edge of the tool A1 rela
position in relation to the _arc._along which the
tool is moved over the grinding face of the grind 25 tive to the wheel A for thepurpose of forming the
ing wheel.
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cutting edge clearance, the additional clearance
behind the cutting edge clearance and for thin
ning the point of ‘the tool i.»e. for making as
carriers formed with a V or other shaped groove
narrow as possible the part between the two cut
slidably mounted on the tool supporting bracket.
The invention is illustrated in and will be de 30 ting edges. Figs. 8, 9 and Y10 show these three
positions of the bracket E relative to the bracket
scribed with reference to the accompanying
F. The bracket E is formed on its edge with
drawings in which:
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The tool is preferably supported'by adjustable
- Fig. 1 is a side elevation partly in section of a
grinding machine constructed in accordance with
the invention.
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three notches e1, e’B-ande3 adapted to be engaged
by a screwed or spring loaded stop ,1‘1 carried by
the bracket F.
When the bracket E is in the 7
position shown in Fig. 8 with the notch e2 en-_
‘ gaged by the stop ]‘1 the tool A1 islin the position
removed.
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for grinding‘ the cutting edge with the cutting
. Fig. 3 is a section on line 3-—3 Fig. 1.,
edge clearance; when it is inithe position shown
Fig. 4 is a section‘; on line 4—4‘ Fig. 1. '
in Fig. 9 with the notch e1 engaged by the'stop
‘Fig. 4 shows diagrammatically a modi?ed con 40 f1 it is in the position for grinding the extra
struction of tool carrier particularlyv for tools of
clearance behind the cutting edgeuclearance of
small diameter.
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the tool A1; and when it is in the position shown
Fig. 6'is a section on line 6-6 Fig. 5.
in Fig. 10 with the notch e3 engaged by the stop
Fig. 7, 7a, 7b and 7°v areiviews-iof the ‘tool car 45 I1 it: isiin the position for thinning the point'of
rier illustrated in Fig. 5 and 6 showing means for
the tool A. By varying the various stop posi
tions the cutting edges of the tool can be ground
setting and centering the tool in the carrier.
Fig. 2 is a plan ofsame with thedriving motor
Fig. 8 is a section taken on the line 8—8 in Fig,
l, and
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Figs. 9 and 10 are sections taken on said sec
to any desired angle and if necessary where a
relatively large clearance to the cutting edge is
50 desired, this may be obtained by moving the
tion line, illustrating the different angular posi
bracket E so that the notch e1 is beyond the
tions of the tool when grinding the cutting edges
thereof.
stop 1*‘.
Figs. 11 and 12 are a plan and transverse sec
tion respectively and drawn to a larger scale, of
. The tool A1 is carried on the bracket E by
supports E1 and E2 the bearing surface of each
being in the form of a y groove. The Support
2,408,618
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cam h6 and located in the horizontal position
shown in Fig. 9. The face of the wheel A is then
moved up to the ?rst cutting edge of the tool
E1 adjacent to the wheel A is ?xed and the sup
port E2 is slidably mounted on the bracket E
being secured in any desired position by the
clamp 64. [The tool is held against the wheel A
by the cam or eccentric c1 and any ?nal ?ne ad
by a screw e5 which is also slidably mounted on
justment made by the screw 65 carried by the
' the bracket E and adapted to be‘ secured in1rany
member E3. vThe motor B is then started and the
desired position relative to the wheel A by the
bracket F’ oscillated about its pivot h to cause
the cutting edge of the tool to travel in an are
over the face of the wheel A until suiiicient ma
clamp 66.
For small tools, the supports E1 and E2 may“
be replaced by an expandible chuck or holder 9
on the end of a spindle 91 carried in a housing‘. G'
‘1.0. terial has been ground off.
slidabfy mounted on the bracket E as shown in
Figs.5 and 6
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' 1 .The wheel A is then moved backwards from
the tool by the cam motion C, the tool reversed
in the supports El and E2 and the wheel again
To facilitate the correct centering of the tool‘ 7 _ brought into its operative position to grind the
in the holder 9, which is difficult with verylsrnall 15 second edge so that both edges are ground for
the same setting of the tool and accordingly both
drills, the housing G may be removed from the
edges will be alike. The extra clearances for both
bracket E and placed on a centering device K_
cutting edges are next ground by moving the
such as shown in Figs: '7, 7a, 7b and 7°. The de-’
bracket E to the position shown in Fig. 9, the
vice K comprises twoi plates k1 and 702 having
their operating faces k3 andrlr1 situated in the 20 wheel A being retracted from the tool after one
clearance has been ground to allow the tool to
same plane so that when the end of the tool A1
be
reversed in the supports and ?nally the
is placed in the device the points of the tool will
bracket E is moved into the position shown in
be correctly set as indicated in Figs. Tb and 7“.
. Fig. 10 for thinning the point at both sides. When
The bracket Fe is mounted on a horizontal pivot
in this position no oscillating movement is given
25
it carried by a bracket H. The bracket F can be
to the bracket F.
oscillated in a vertical plane to traverse the cut
As the tool A1 passes in an arc across the face
ting edge a1 of the tool A1 in an are‘ over the face
of the grinding wheel A it tends to keep the face
of the grinding wheel A.
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true and prevents the formation of grooves
The bracket H is mounted in vertical guides at
therein.
carried by the frame D for adjusting the-height
I claim:
of the tool A1 relative to the wheel A for the cor
In a machine for grinding twist drills and sim
rect setting of the tool according to its diameter.
ilar tools of the kind referred to, the combina
The height of the bracket His controlled by the
tion of a grinding wheel mounted on a horizon
cam 726 on the sleeve h1 which is operated by the
hand wheel hr‘. The wheel h2 is preferably pro 35 tal shaft so that its grinding face is vertical and
a frame carrying the said shaft, a bracket sup
vided with a graduated scale It3 (see Fig. 3) work
porting the tool at a'suitable angle to the grind
ing over a fixed. indicator It4 so that the correct
ing-face of the wheel; a second bracket on which
setting of the bracket H for-any given ‘diameter
the tool supporting bracket is pivotally mount~
of tool A1 ‘within the limits depending on the '
40 ed so that the latter can be moved to bring the
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cam it can be readily obtained;
As it is desirable that the tool A1 should not
be moved over theiface of the-wheel A when
thinning- the point of the'tooL/a stopcl1 (see Figs.
3, 8, 9 and i0) 'i's‘v-provided on the‘ frame D to pre
vent movement of the bracketsE and F across
the face of the wheel when the bracket E is in
the position shown in Fig. 10 for thinning the
point of the tool but which will allow the brack
ets to move over the face of the wheel when grind
ing the cutting edge clearance and the extra '
clearance behind the cutting edge clearance.
When grinding a large drill‘ it may be desir
able to secure the drill in thercarrier E1 and
means for so doing are illustrated in Figs. '11 .
and 12. The‘means illustrated comprise a peg
e7 at the bottom of the V groove in the carrier
E1 which engages one radial face of the. drill and/
or a clamp 68 adjustable mounted on¢a rod e9
tool into‘ various positions relative to the grind
ing face when grinding clearances on the cut
tingedge such as the cutting edge clearance and
additional clearance behind the cutting edge
clearance and for thinning the drill point, a third
bracket on which the'second bracket is mounted
to pivot in‘ a vertical plane to move the tool in
an arc across the grinding face of the wheel and
guides carried by the frame on which the third
bracket is mounted so that it can be moved ver
tically to adjust the height of the tool support
ing bracket to suit Various sizes of tools and
bring the axis of the tool to be ground into the
correct position in relation to the are along which
the‘ tool is moved over the grinding face of the
grinding wheel, a slide or the frame on which
the grinding wheel is mounted so that its grind
ing face can be moved to and away from the tool,
carried by an extension of ‘the carrier E1 and
a spring tending to move the wheel in a back
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adapted to' be secured against the circumferen
tial face of the drill.
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In operation the tool A1 is placed on the sup
ports E1 and E2 ‘and the bracket E raised to the
correct height for the diameter of the tool by the l
ward direction and a cam for moving itina for
ward direction against the pressure of the spring.
DAVID THOMAS EDWARD FIELDING.
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