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The Cowells mill came in handy here with a 1mm end mill to cut the 80 thou deep slot ( 8 passes at 10 thou a time). Very gently did it.
I now need to put the slots in the table.
Try 8mm in 5/16 collet but cannot get it to clamp up tight enough. Never having used the BCA jig borer before I'm not to sure the best way of holding the spindle whilst collet is tightened up. All ideas gratefully received.
If anyone has either a 3/8", 6mm or 10mm collet for a BCA threaded for Clarkson end mills surplus to requirements (I know this is highly unlikely, but got to be asked) there are beer tokens available for the same.
Perhaps you should sell some castings to give them fewer hiding places.