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Toolholder and Collets ADVICE - ER v. EOC4/17
We have a Weeke Vantech 512 CNC and are looking to buy a few more toolholders for the first time. We purchased the few we have now (HSK-63F) with the CNC and they have an EOC25-R collet, but it looks like almost everyone else used an either ER32 or ER40 collet. Can anyone explain in simple terms the reason to go with one type or size of collet over another? Any brands recommended?
We have searched the internet and this website, but have not been able to find a simple chart that show pros/cons/etc. of one type or brand over another. Any advice on toolholders in general would be helpful as well.
I am sure the 25 allows you to run a capacity of up to 16mm 5/8 shank and the er32 is up to the 20mm 3/4". The er 40 Is larger. We have a Rover 30 and most of the bits we are running are 3/8 so we are using the er-30. However on the fly cutter we are using the er-40. I believe you extend the actual length of the grip on the shank, and larger shank capacity
Hopefully Chuck Hicks will jump on and comment further
My understanding is the difference between ER and EOC is the length of the collet. Specifically the length of the contact area on the tool shank. The EOC style is longer and has a longer contact area. This presumably relates to greater holding force. The EOC is ever so slightly less accurate. It is .0004 TIR (Total Indicator Reading) compared to a .0003" TIR of the ER. The EOC style is usually more expensive. Unless you are cutting something really hard, I'm not sure EOC has an advantage.