I have been promising myself to make one of these for a while and the flywheel's were the perfect excuse.
OK its a tool holder with a round bit. : The idea is that the bit can be rotated so for square and acme threads with a large helix angle. the tool can still have a substantial body and be rotated to match the helix angle, maintaining the strength of the bit.
In this case it is rotated so that the OD of the recess can be cut without the bottom of the tool binding on the arc.
The completed recess.
At this point my mobile v SWMBO advised me to stop as I had been on my feet for a whole 2 hours. Nuff said. : :
Good to see you back on your feet after your extended period in dry dock. I empathise with your position after having just returned to the workshop after a couple of weeks off with the dreaded swine-flu. - Take it easy.
When you are back in the shop could we have a close up photo of the business end of that tool please.
Sorry to hear about the op, and glad to hear that you have recovered and are back in your workshop,
also hope you never have to go through that again.. ever, i think i read you have had 6 of these removed.
Wishing you the best of health now and future more
Bob, welcome back to some machining
And as to that tool holder: I have a similar one - made from the body of a broken tungsten tipped tool, except mine has 2 grub screws to hold in the bits - I found that only one screw is sometimes too little to hold the bits securely. I leave it in one of my QCTP holders - making that holder on its own a "semi-quick-change" holder. When I grind bits for it, I just try and make the tips on-center; makes life easy