JoeOCNJ
Member
Hi gang,
I've been noticing lately when I drill blanks on my lathe using the PSI "C" series chuck with the dedicated drilling jaws for it, along with the tailstock drill chuck; the hole that is drilled does not remain the same size. It's tapered and off by as much as 1mm (checked with a caliper). It's always the side that the drill bit makes contact with first, and I'm not sure how deep the size variation goes but I'd guess at least 1/4 - 1/2 inch through the blank. This is the first time I have had any issues with drilling this way since I got the equipment to do it like this.
BTW.. this only occurs with acrylic blanks, wood ones seem to be just fine.
Any thoughts??? I'm stumped (other than my bits magically grew as time went on :wink
Thanks in advance
I've been noticing lately when I drill blanks on my lathe using the PSI "C" series chuck with the dedicated drilling jaws for it, along with the tailstock drill chuck; the hole that is drilled does not remain the same size. It's tapered and off by as much as 1mm (checked with a caliper). It's always the side that the drill bit makes contact with first, and I'm not sure how deep the size variation goes but I'd guess at least 1/4 - 1/2 inch through the blank. This is the first time I have had any issues with drilling this way since I got the equipment to do it like this.
BTW.. this only occurs with acrylic blanks, wood ones seem to be just fine.
Any thoughts??? I'm stumped (other than my bits magically grew as time went on :wink
Thanks in advance