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End mills in a drill chuck

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John Olsen09/12/2010 21:20:18
1294 forum posts
108 photos
1 articles
I mustr admit that the idea of holding milling cutters in a either a lathe chuck  or worse a drill chuck does not fill me with enthusiasm. One of the problem I have had with parting has been when the job decides to start moving outwards in the chuck. If a piece of soft mild steel, maybe half an inch to an inch in diameter, can start to work sideways under the forces from a parting tool, what chance have we of holding a milling cutter securely?
 
I know that not everyone, especially when starting out, can afford the proper gear, but there are cheap alternatives. One that I have already mentioned elsewhere on this site is to make a holder for the cutter. This can be a taper shank to fit the spindle, tapped for a drawbar, and bore in situ for the size of cutter. A couple of grubscrews/setscrews at right angles will secure the cutter in place. (you can grind little flats where the screws will bear to be extra sure if you like.) This sort of things is actually sold commercially, but is not too hard to make, especially if you buy the taper shank. If you don't have a taper in the headstock (the Unimat does not) another possible plan would be a similar holder, but with a parallel shank to hold in the  four jaw chuck. This would need setting up with a dial gauge before use, but the holder being soft and a larger diameter should be able to be held securely in the jaws. It can of course be long enough to extend to the back of the jaws.
 
regards
John
Chris Trice10/12/2010 00:15:56
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1376 forum posts
10 photos
As John points out, a purpose made holder beats a lathe chuck but a lathe chuck beats a drill chuck. Frankly any chuck with jaws that tilt or are belled is no good to man nor beast. The jaws want regrinding parallel while gripping a ring at their tip or the whole chuck replacing.
Nobby13/01/2011 17:29:20
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587 forum posts
113 photos
Hi
These home made cutter holders is


an  an alterative to holding cutters in my drill chuck on my kerrys drill. the abour is scerwed to an insert in the drift slot
Regards Nobby
Martin W15/01/2011 11:20:36
940 forum posts
30 photos
I notice in the Feb 2011 edition, No 173, of MEW that there are two articles that appear to show drill chucks being used to hold milling cutters , see articles on edge Finding and Strip Cutting! 
 
If this is such a frowned upon practice then should these articles have had the chuck obscured so that new comers to the hobby aren't tempted into what many regard as bad practices? I will leave it to the more knowledgeable contributors on this forum comment as to the wisdom of employing a drill chuck to hold milling cutters  and whether this practice should appear to be condoned by such an august publication as MEW.
 
 
 
Cheers
 
Martin
David Clark 115/01/2011 13:46:05
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3357 forum posts
112 photos
10 articles
Hi There
Missed those.
Slapped wrists.
regards David
 
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