5cm milling vise

The vise is based on a popular style of vise manufactured by Kurt, but
scaled smaller and around a few handy pieces of scrap and an odd tap.

The body is a strut cut out of the iron frame from a junk George Bent
"Crown" upright piano, but the jaws and nut are some steel cutoffs. The
3/8"-20 lh screw is a nice fit between the 16mm shoulder and 1/4" hex
drive, and it is supported between two thrust bearings.

The fixed jaw is held in place with a 1/4" square key and two 1/4"-20
shcs. To make advantage of the screw body, and even more so to assure
location I drilled undersize pilot holes in the vise body and then in
assembly drilled with a nr. 8 drill though both parts, following with an
F and tap.

The movable jaw is one piece but the rear portion might as well be
pinned and screwed on to simplify milling the recess. The nut is made to
fit the lower channel and jaw recess, and drilled clamped in place at
the same time as the clamping screw hole with a long drill. Instead of a
fiddly loose pad the cylindrical insert is just a 1/4" dowel pin with a
ground flat, lightly pressed in place so it can self align with the face
on the nut.

I used a piece of 1/2" rod for the screw, and pressed a 5/8" collar onto
the end to bear against the thrust washer. The cast iron washer is press
fit into the housing with some grease and the screw, holes for the 2-56
shcs drilled in assembly like with the fixed jaw.

The base is sawn out of a plate that already had the stepped bore, and
the ears shortened on a lathe faceplate to clear hex bolt heads. The
clamping plate is cut off the end of a shaft coupling turned down to fit
the recess. Slots for alignment keys would complete the vise and base
but I haven't made them yet.

Clark Panaccione
http://www.freewebs.com/mireut/
13.02.05

1/4" square key

fixed jaw

thrust bearing

thrust collar

2-56 shcs -

5/8" (2)

thrust bearing housing

1/4"-20 shcs - 1" (2)

clamping screw

8/32 phms -

5/16" (4)

jaw liner (2)

movable jaw

cylindrical insert

clamping nut

8-32 shss - 3/4"

6-32 shss -

3/16" (2)

thrust collar

body

14.1

1.04

1:1

Assembly

5cm vise

103

drill nr

.9 pilot;

in ass’y redrill nr

. G,

c’bore 3/8" dia, 3/8" deep

64

55.0

6.35

19.5

150

10.0

70

48.0

ream

0.313"

9

18.0

7.6

26

20.02

35.0

5cm vise

base

14.1

1.04

1:2

15.0

6.4

10.0

3.175+/-0.04

+0.00/-0.04

1:1

fixed jaw

fixed jaw

1/4" square key

, 48mm long

16.1

1.04

5cm vise

3.175

+0.04/-0.00

19.5

12.7

drill nr

c’bore 8.4, 2.5mm deep

9.00

27.5

35.0

48.0

6.4

28.0

6.35

+0.00/-0.04

Drill in assembly:

nr

. 8 10mm deep,

tap 1/4"-20

3.175+/-0.04

9

14.1

1.04

1:1

moveable jaw

movable jaw

cylindrical insert

5cm vise

40.0

drill nr 29, tap 8-32

23.0

17.0

drilll nr 3, ream 0.2502"

20.00

20.5

48

20.2

13.9

4.00

12.7

6.35

14.1

1.04

1:1

clamp screw

Clamping nut

clamping screw

5cm vise

60660

7.5

17.5

20.00

25.4

25.4

13.5

15.3

1

1.0

161

39

4.0

20.0

23.0

1/4" hex

3/8"-20 LH

drill 5/16" countersink 3/8"

tap 3/8"-20 lh

7.94

15.85

9.53

14.1

1.04

1:1

bearings

thrust bearing

thrust collar

5cm vise

21.0

3.00

drill nr

. 1/16" pilot;

in ass’y redrill nr

. 37,

c’bore 1

1/64" 6mm dp.

thrust bearing housing

8.00

9.53

20.0

9.53

16.00

19

7.94

5

16.00

1:2

Swivel base

base

clamp plate

16.1

1.04

5cm vise

6r

1

19

6.35

109

62.0

12.4

6.3

6.4

12.7

drill nr

. 8

c’

sink nr

. F

tap 1/4"-20

90

70.02

76.32

76.30

70.00