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19th September 2020, 01:30 PM #1Most Valued Member
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Setting up to grind large countersink
SAM_0708.jpgHello from the Old Goat.
I thought this might be interesting as I time the countersink to the grinder's cam. Just like timing a car engine the procedure has only a few steps but the instructions are hard to find.
On the top of the fixture there is a sliding plate that is slid into a slot in the cam driver. The cam is timed to the shaft. An engineers square is placed on the parallel on the table and brought up behind the countersink. The rear flute has both leading edge and trailing edge aligned with the square. Both edges are perpendicular to the table. The chuck or collet is now tightened. When the fixture is run and reaches this point the roller is going over the cam and the shaft is retracted, moving away from the wheel. Further rotation advances the shaft and the wheel grinds the land behind the edge. I have a set of cams from 1 to 8 lobes.
Around 15 mins to regrind a $200 cutter.
Regards
BC
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