Bessey / Wolfcraft One-Hand Clamp to 20 mm Workbench Clamp conversion

For best performance the Benchdog has to fit closely. Due to different accuracies/ tolerances of every printer and perforated grid plate, I recomend you first print the "tolerance test". It is steped in 0.1 mm incremets from 19.7 to 20.2 mm diameter. In most cases 19.9 mm should be the right size.

The difference between Wolfcraft and Bessey is the position of the retaining hole and pin.

I also made a two piece version where the clamps rail can be pushed further into/ below the perforated grid plate. You can find it here: https://www.printables.com/model/774798-bessey-wolfcraft-one-hand-clamp-perforated-grid-wo

A version without any Screws can be found here: https://www.printables.com/model/774915-fast-and-screwless-bessey-and-wolfcraft-one-hand-c

Print settings:

8 Perimeters
50% Infill

Hardware:

1x Panhead screw M6 x 16 shortened to 14mm
1x Square Nut M6 (DIN 557)

You could try ¼'' equivalent, but i am uncertain it fits the hole in the Rail

Installation:

1.  Remove fixed jaw
2.  Push Benchdog with flange towards movable jaw onto Rail until holes align
   (if to tight use a mallet)
3.  Secure with Nut and Screw
   (The Screw does not transmit any clamping force hence only hand tight!)

Usage:

The workpiece (pressure point) has to be placed as far as possible away form the clamps rail due to how this type of clamp works mechanically. If the workpiece (pressure point) is to close to the Rail the Benchdog will simply slide out. To improve clamping, tilt the Clamps Rail away from the workpiece while tightening.

Uninstallation:

1.  Remove Nut and Screw
2.  Pump movable jaw towards benchdog to push it off the rail
3.  Pull benchdog from Rail
   (If its still stuck, print the extraction tool or find something similar to extend the range of the movable jaw.) 
4. Reinstall original fixed jaw 

Notes:

To ensure maximum strenght of the Benchdog the holding screw is placed below the perforated grid plate (thickness <20mm). Therefor the Benchdog extends below the plate.

Commercial Benchdogs have an undercut below the flange to sit flush against the table. This would reduce the strenght of a printed part and therefor was not included. However, if the holes of your perforated grid plate are chamfered or rounded this is no problem.

.step-files are provided in case you need a different diameter or want to adapt to other clamps. If you do feel free to add a remix.