[SCzEngrgGroup]

The cuts at the end are heavier than was possible before the PDB.

That makes no sense.... The PDB can't possibly enable heavier cuts, unless you were under-tightening it before. You can get the drawbar MUCH tighter manually than the PDB can.

Regards,
Ray L.

[btu44]

That makes no sense.... The PDB can't possibly enable heavier cuts, unless you were under-tightening it before. You can get the drawbar MUCH tighter manually than the PDB can.

Regards,
Ray L.

Just like alot of things, tighter doesn't always mean more clamping pressure.
I think I've increased clamping surface area and it's why the improvement.
But all I can say is I'm not a newbie at this, I've done work that required alot of roughing on the PCNC1100 and I know how to tighten a draw bar.

[SCzEngrgGroup]

Just like alot of things, tighter doesn't always mean more clamping pressure.
I think I've increased clamping surface area and it's why the improvement.
But all I can say is I'm not a newbie at this, I've done work that required alot of roughing on the PCNC1100 and I know how to tighten a draw bar.

Well, I gotta wonder if there are some funky collets floating around out there, as there have been a number of people having pull-out problems lately. I've been using TTS with several different machines, and several different collets for years. I've never experienced pull-out, either working manually, or with my PDB, which tightens the drawbar to 30 ft-lbs. If the collet and spindle are as they should be, tighter should be better, and a PDB should make no difference, other than convenience.

Regards,
Ray L.