Groz type quick change tool post.
The picture above and the three below show the basic arrangement of the tool post. I don't have blue prints for this as I made it pretty much on-the-fly. I've included pictures with a ruler in critical places and kept the pictures at a high resolution.
The above picture shows the stainless steel insert that the tightening bolt presses against. The tool post is made of aircraft grade aluminium (hard) but I still prefer to have the stainless bush in there.
The picture above shows the split side with the side removed. Note that the rod pivot is glued in on one side.
NOTE: The channel and dovetails and the hole for the rod pivot are cut/drilled BEFORE the block is split in two, as is the hole for the tightening bolt. Naturally, the block should be machined flat and square on all sides before any work is carried out.
The picture above shows the moving part.
The tightening bolt. It's made of stainless steel. The tommy bar is a sliding fit and can be removed for safety.
The picture above shows the two major parts.
The pictures below include a ruler in the shot. In short, the block is 50Wx50Lx40mm deep.
In the shot above, note the stainless steel, threaded bush. Again, this is for strength.
Most of the tool carriers have three bolts. This one escaped with two because it was for a different tool. The boring tool really should be in a three bolt carrier as it's too short for this two bolt one.
In the picture above I've arrowed a little bit of rubber. A hole was drilled that partly cut into the main thread for the brass thumbscrew. A short 10mm length of cut up 'O' ring was pushed in the hole and this gives friction to the thumbscrew to stop it turning accidently.
See what I mean about too short for two bolts.
I hope the pictures help
you to make your own quick change tool post. None of the dimensions are critical,
it's a very tolerant design.