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Mosey, did you notice the problem before the end mil depth spoiled the workpiece? I suspect the oil is what allowed it to creep in conjunction with the helical milling forces pulling down on the end mill. I hope you may have caught it in time.Bill
Jo,I'm a little confused about you statement. If not using an end mill to cut a slot what would one then use?gbritnell
End mills are not suitable for cutting slots equal to the cutter diameter. For this duty a slot drill should be used; this has the advantage that, unlike the endmill, it may be fed axially down into the work so that slots with blind ends may be cut. "[/i]Jo
Hi Mosey.is it possible you can put up a picture of the W20-ER collet-holder that you have. My be you have a drawing too CS