The parameter can be trivially measured with a 50 tool and is one of the most rudimentary things to examine when designing a millnote that there are aftermarket spindles that can be fitted into certain mills though. If they are not sure its an obvious red flag.
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Harvey tools technical resources master library includes charts and article to help you make the best tool selection decisions.
Upcut vs downcut aluminum. Try to avoid cnc mills without real spindles. If you need to get one ask the manufacturer about tir.
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