Updated version of my fractal bench dog clamp. STEP file also included for those who want to make adjustments.
After watching a restoration video by Hand Tool Rescue of a fractal vise (https://youtu.be/QBeOgGt_oWU), I was fascinated by the mechanism, it lets you clamp curved or irregular objects. I didn't find anything similar when I searched various model hosting sites, so I decided to design my own. That design was uploaded here a few years ago: https://www.thingiverse.com/thing:4902085
Rather than designing an entire vise I instead designed a jaw that can be used as a bench dog, in workmate benches, or proper workbenches.
Two options for the peg are included 0.77", 19.6mm- this fits my workmate that has slightly oversized holes, the other is a standard 0.75" 19mm version as well.
All parts were split so that printing could be accomplished without supports. The design is intended to be assembled with screws, but adhesive could work for most parts, except the retaining screws.
A 0.3mm clearance was the basis of design, but the pin sides of the sliding dovetailed parts can be shimmed for printers that can't achieve this precision.
either #4-40 or 3mm screws will work. This improved version will accommodate a range of bolt lengths 10mm-16mm (3/8"-5/8") will fit. Another change from the previous version is that in lieu of grub screws instead small cut lengths of filament inserted during assembly of the upper and lower halves. There is a photo included showing where this goes.
If anyone wants a version with a different diameter, let me know and I can adjust that, or you can make your own to fit, the hole in the main jaw has a 3° taper to guarantee a tight fit.
I designed the peg split so that it prints in the orientation for optimal strength, some users prefer a peg printed in one piece so I included this as well, but still recommend the two piece.
For doing real work, this should be printed with several perimeters (I used 4 and it seems quite tough)
agmcmll
