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Holding large milling cutters in an R8 spindle

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lfoggy	30/06/2018 17:28:26
231 forum posts 5 photos	I've just acquired a 'job lot' of new milling cutters consisting of mainly 6-20mm slot and end mills. Included however were 7 new Dormer end mills with 25mm and 1" threaded shanks. I have a mill with an R8 taper and usually use R8 collets to hold cutters. Max size for these is 20mm I believe. These new cutters are too good to waste so I need to find a way of holding them. Looks like I may need to buy an ER40 collet chuck and holder but are there any other options? Regards
colin brannigan	30/06/2018 17:36:16
125 forum posts 29 photos	There is a R8 collet which will take either 25m or 1" dia cutters can't remember which, but I don't like them have seen too many break under decent cuts, go for ER 40 R8. Colin
Chris Evans 6	30/06/2018 17:38:27
2156 forum posts	ER 40 is most likely the best option. I use a Clarkson chuck for my 1" shank stuff on the R8 equipped Bridgeport, downside is that with threaded shanks you cant easily get that extra 1/4" reach without turning up a centred spacer to fudge the job. ER 40 are cheap now so decision is easy.
Mike Poole	30/06/2018 19:33:27
3676 forum posts 82 photos	A carbide lathe tool will turn the shank of a HSS cutter down to a suitable size. Mike
Bob Astill	18/07/2018 12:41:39
114 forum posts 20 photos	I use one of these for light work and for £14 you cant go wrong https://www.ebay.co.uk/itm/25-mm-R8-MILLING-COLLET-SUITS-BRIDGEPORT/332539949140?epid=1793202107&hash=item4d6cecf054:g:WtEAAOSwMNxXUCqu

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