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Harold Hall

Workshop Projects

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Drawings

Single fixing clamps

Expanding on the idea I then thought that a shorter length with just two grub screws, one either side of a central fixing, would satisfy most requirements. Photographs 3  shows an examples of this type being used on a larger milling machine. On the milling machine your slotted workpiece clamps should suffice as the rear jaw and provide adjustment when being used across two or more tee slots as Photograph 3 shows. Photograph 4, showing the improved type, see below, show s how easily the clamps can be used for mounting a workpiece at an angle. The drawings are based on them being used on the milling machine but could easily be scaled down for use on the lathe's cross or vertical slides.

 

Making the clamps is so simple that no explanation is required, just note that the hole that takes the grub screw is clearance over part of its length so as to minimise the length of the threaded portion to be made.

 

The grub screws used in the single clamp should be at least 12mm long, if not, then the long arm of the key will have to be used to reach the screw and the shorter arm for applying the tightening torque, making it a little difficult. However, do take note of the fact that due to the finer thread of the screw, compared to that of a vice, much less torque is required.

 

Improved Clamps

If you have another hour or so available then you could consider making the improved version which includes its own pressure pads. See Photograph 5 which shows these together with the other suggested parts.

 

I have left the drawings to line up with those I have made but the viewer may like to consider making them shorter, 10mm maybe even 8mm. This would enable them to work with thinner workpieces. Being so simple and quick to make they could be made in various heights, even taller for use with larger parts, say 8, 12, 16 and 20mm.

Low Profile clamps, using
Low Profile Worktable Clamps, using
Low Profile Worktable Clamps
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 3

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 4

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 5