« Last post by Bitterend on September 18, 2018, 12:51:03 PM »
Not quite. I have a Clarkson tool grinder and would like to be able to grind drills with 2 and 4 facets. The clarkson attachment is about as rare as hens teeth! and the last one I found for sale was about 4 years ago and sold for about £1000. The geometry for drill points is complicated. The best explanation I had was grinding the form of the inside of a cone one one face. This jig is similar to Clarksons own, which appears to be a modified Potts Jig. I am making further modifications to take an ER32 Colet holder (because I have one) and also to take a clamp to hold lathe tools so I can easily grind accurate angles for oddball screw threads, Buttress threads being one of them.
There are plenty of these Clarksons about, also known as a Mach tool grinder in the states, I could make one from paper sketches, but, I really need proper working drawings, and hopefully I can see most of the problems before cutting metal.
I have not managed to get my head round TC properly before, only used it for 2D plans. This seemed to be a good real-world exercise. An assembly with multiple parts, most of which are fairly simple. What throws me mostly is the manipulation of the workspace and the snaps. Just spent hours trying to figure out how to get a construction line a set distance above the bottom of the base for the axis height of the grindstone.
There is a YouTube video of a Clarkson Drill Grinder Atachment by George Hegg