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Strange clamps

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Trevorh10/06/2019 11:57:08
303 forum posts
87 photos

Hi all,

looking for help in identifying these clamps I have been given.

2019-06-09 19.38.44.jpg

Here are the what I think are some kind of setting screw note the head

2019-06-09 19.40.17.jpg

I have 2 sets of these but have no idea what they are used for

I have more photo's in my album - Clamping tools



Edited By Trevorh on 10/06/2019 11:58:20

YouraT10/06/2019 12:04:55
64 forum posts
16 photos

I'll bet the "setting screws" as you call them are hardened and have a range of different sized holes through them.

This looks very much like a cross-drilling jig - the cut outs on the bushes are for the retaining screw shown in your album.


Plasma10/06/2019 12:07:55
443 forum posts
1 photos

+1 for cross drilling jig. Looks a nice piece of kit, I built the Hemingway finger plate clamp and it has bushings for different sized drills.


Neil A10/06/2019 12:09:02
102 forum posts

This looks like a fixture for cross drilling round bar. The items in the second picture are interchangeable drill bushes that fit in the cross bar at the rear of the fixture. There should be a screw in the tapped hole that engages with the cutout on the head of the bush to stop it coming out when the drill is withdrawn. A handy fixture.


HOWARDT10/06/2019 12:16:41
800 forum posts
28 photos

Looks like a production shaft cross drilling jig. The bushes are Grip drill bushes for guiding the drills. Used to use Grip in the 70's, they used to make the whole range of fixture components in those days in competition with WDS. Not sure when Grip expired, bushes now made by B&T in Nottingham and others.

Trevorh10/06/2019 12:17:01
303 forum posts
87 photos

Hi Yourat

yes that correct the different screws all have different dia holes through them and are hardened

So its called a cross drilling jig and so assume that as Neil A says i guess if I need to drill a round bar/shaft then its clamped and use the setting screws (guide bushes) to control the drill

Many thanks for this info

regards trevor

Trevorh10/06/2019 12:25:19
303 forum posts
87 photos


thanks you for your description, combined with the others it now makes sense as there were also some end stops to butt up against so that what ever was being drilled could be replicated

I have uploaded some more photo's of the both sets that I have, they even came in there own wooden protective boxes with cut outs for each of the various parts

Now I just need a use for them



old mart10/06/2019 12:54:59
3411 forum posts
210 photos

Used all the time by toolmakers and jig makers, the drilling bushes are hard and quick detachable by gripping and twisting the knurled top. The jig would also be used on drilling machines for production runs.

geoff adams10/06/2019 13:07:06
210 forum posts
201 photos

drill bushes for drill jigs so you can drill and ream in one op in the same jig using different sizes holes in the bush they drop into a harden guide the shape allows the bush to be turned to lock under a cap screw so the bush does not come out when drilling made many jigs using these


Trevorh10/06/2019 13:09:54
303 forum posts
87 photos

Thanks lads

the parts must have been quite small as the largest hole in the guides is only 4mm and goes down to 0.5mm

overall length of the base is only 200mm



YouraT10/06/2019 13:53:54
64 forum posts
16 photos

A more general purpose version would be something from the Reglus range.

I have one of these (not mine, but identical, and the pictures are better!):

Don't use it much, but invaluable when needed!

Trevorh11/06/2019 08:49:08
303 forum posts
87 photos

Plasma, I have sent you a PM



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