Re: Lost drill hole size accuracy in drilling operations
Originally Posted by
venta7
Thank you for the reply.
I do understand that, it was accurate enough for my purpose and now the holes are way oversized.
I've also tried to drill with 5.7mm and then use 6mm reamer. That didn't produce better result. Still too oversized for 6mm pins.
Can't figure out what is different now unless there is some tool holder run out, as I mention even with 6mm drill only the tolerance was good for my purpose.
Well it used to work fine and now you have some runout or something going on. I would put a dial indicator on your chuck and with the drill bit in the chuck. Try to move the the bit with your fingers or something while the dial indicator present. Rotate by hand with the dial indicator on the bit and etc. Has your drill bit got run out or is it the chuck or perhaps the machine has some wear on the axis?
Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP