I use a radiused groove to minimize the groove volume....
Form tools are incredibly useful items to have Jack. If you have a grinder and a piece of HSS, most any shape is possible, just look at the job that needs doing and grind the cutting edge and relief that you need. A thread cutting tool is an example of a form tool, as is a grooving tool...internal or external. Trepanning tools, radius cutters etc...all form tools.This fellow shows a simple technique that results in some accurate tools sized perfectly for your Sherline...Al
Form tools are incredibly useful items to have Jack. If you have a grinder and a piece of HSS, most any shape is possible, just look at the job that needs doing and grind the cutting edge and relief that you need.
This fellow shows a simple technique that results in some accurate tools sized perfectly for your Sherline...
. I then removed the stock piston, adjusted the length of the one with the Crosman cup to put it under slight compression (you can feel the resistance when the handle is 1" from closing) and repeated the test.... I then removed the valve, replaced the valve front end with the flat one, installed the flat-topped piston (adjusted so that resistance on the handle is felt at 3/4" from closing) and tested one more time[