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I am looking to get a spare ISO30 chuck. My existing ones have smooth tapers with a groove. Some of the ones I'm looking at have a notch in the taper, pic attached. The spindle is an HSD 951. Could someone shed some light on the smooth taper vs notched alternatives.
hy, notch type is there to assure that the contact is done in both areas : upper and lower; this is a trick to avoid uneven contact, at least theoretical
downside is that using a notch type for too long will generate a specific wear inside the spindle, and may lead to fly-out issues if a non-notch/classical toolholder is used
i would gently advise you to stick with the cone types that you allready use; also, you may inspect your toolholders, especially the ones that you use most, so to have a clue about your current contact area; if it is not the same among different toolholders, then ... take a guess :) kindly :)
ps1 : if you wish 4 something extra, then use nikken's 3point contact, with elastic taper, but this would be too much for a mere er32
ps2 : bearing nuts ...
Sound advice, I have ordered more of the chucks I have. Thanks for the info.