Bostomatic tool holder specifications

[Kmed]

Hi. We recently purchased an older bostomatic 300 mill, and even though we have a very good tool holder selection, I am looking at purchasing more for ER collets. The tool holders seem to be a little shorter than what I am familar with and was wondering if anyone knew what type they are so I can purchase new ones.

Thanks

[Gunner]

Kmed
We have older bostomatic 400 single and multi spindle mills. Not sure if the collet size will be the same but we use ER-16 on 40,000 RPM spindles and ER-20 on the 24,000 RPM spindles. Hope this will help some.

[Kmed]

Sorry maybe I shout have been a little more specific. I am curious at to weather or not they are BT-CAT- or possibly a proprietary taper. I have 2 er 32 tool holders but want 15-20. Carbide tooling does not like to have screws tightened. I have cracked 6 tools so far. getting annoying, and HHS / CObalt does not cut as well. Hohummm should have bought anew machine.. The accuracy of it is incredible though, and can interpolate holes within .0005.. Better than many machines using a boring bar..

[Gunner]

Kmed,
took a little research but here it is.
SKI-20 for the 40K spindles and SKI-25 for the 24K's. We purchase these through Schaublin or Precise.

[howdy]

The toolholders for the Bostomatic SC82 spindle, which is the 40,000 RPM is a 20 taper toolholder, and Schaublin or Precise are the only places you can get the holders. They are ER16 collet holders & run $430.00 each from Precise. I made the mistake of trying an ISO 20 taper toolholder that Techniks makes for the Haas OM-1, which is less than half the cost, and it does not fit. However, Techniks may make toolholders based on your specifications. Agie Charmilles / Mikron now owns Bostomatic. They are locted in Holliston MA., and will give you the toolholder specs. Precise also will have them listed on their website.

[RICHARD ZASTROW]

Bostomatics also used Universal Quick Switch holders in the main spindle. The Universal Q/S has two appendages protruding from the sides. Ours used Universal Q/S 300 size in the main spindle.

Dick Z