Novamill BT30 stud angle

[Clive S]

I am trying to make a powered draw bar for a Novamill BT30 what is the correct angle for the stud? The collect will have 5 1/4" balls

[m_c]

30 (or 60 depending where you take the reference from) degrees.

http://www.denfordata.com/bb/viewtopic.php?f=41&t=4889&p=19429#p19429

[Clive S]

30 (or 60 depending where you take the reference from) degrees.

http://www.denfordata.com/bb/viewtopic.php?f=41&t=4889&p=19429#p19429

Thanks. I had seen that thread before some time ago but forgot where it was:stupid: I probably have bought the wrong one then.
https://www.ebay.co.uk/itm/110222-BT30-40-50-45-Degree-Chuck-Pull-Stud-Retention-Knob-CNC-Milling-Tool/272292194770?ssPageName=STRK%3AMEBIDX%3AIT&var=571118252607&_trksid=p2057872.m2749.l2649

Its not come yet do you recon the above would work?

[m_c]

My guess would be the 45 deg taper is likely to not lock as strongly as the 30deg, and might possibly push the gripper balls back under high/interrupted cuts.

Cutwel have the correct studs listed - https://www.cutwel.co.uk/tool-holding/tool-holder-accessories/pull-studs/bt-mas-pull-stud-standard
I did also find an Indian company last week who had through coolant studs listed at a cheaper price - https://www.toolsengg.com/ps-bt30-45-deg-w-tc.html

Only reason I currently know the spec, is I'm looking for a batch for some new tool holders I've got ordered for my Triac.

[Clive S]

My guess would be the 45 deg taper is likely to not lock as strongly as the 30deg, and might possibly push the gripper balls back under high/interrupted cuts.

Cutwel have the correct studs listed - https://www.cutwel.co.uk/tool-holding/tool-holder-accessories/pull-studs/bt-mas-pull-stud-standard
I did also find an Indian company last week who had through coolant studs listed at a cheaper price - https://www.toolsengg.com/ps-bt30-45-deg-w-tc.html

Only reason I currently know the spec, is I'm looking for a batch for some new tool holders I've got ordered for my Triac.

Thanks I knew you would know.. I have found these
https://www.ebay.co.uk/itm/2Pcs-BT30-x-60-Degree-Pull-Stud-Retention-Knob-CNC-Milling-Tool-Holder/392131060115?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

[m_c]

Those should do.

I've just bit the bullet and ordered a batch of BT35 ER toolholders with pull studs, as trying to juggle the existing mish mash of holders and collets finally broke me last week when I wanted to add a new cutter. Just need to wait a couple months for them to be delivered now..