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Industrial Hobby Mill question.

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I have one of Aaron’s first IH mills. What have you done to yours, if you still use it, to maximize speed. If you use your speeds and feeds unless you can get over 2000 rpms the machine is limited.

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FWIW, I sold the mill and now own a Tormach PCNC 1100.

The weak link, as you surmise, is the spindle.  My plan had been to solve the problem by fitting a Tormach spindle cartridge.  They’re available pretty cheap in R8 and BT30 tapers. I was going to fit a BT30.  I don’t think it wouldn’t been hard.  I also looked at doing a straight belt conversion to the existing head, which many have done.  I preferred the Tormach approach because the amount of work looked about same and I felt the Tormach spindle cartridge was better made.

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