New Use for Cone Drills?

This topic has 11 replies, 5 voices, and was last updated 5 January 2015 at 19:38 by Neil Wyatt.

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4 January 2015 at 17:17 #174736
Neil Wyatt
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@neilwyatt
A purely random observation, the included angle of my cone drill exactly matches the 8-degrees of an ER25 collet, but its maximum diameter is only 3/4". This may not seem important, but it could be a useful tip for anyone planning to make a holder for ER16 collets!

Neil
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4 January 2015 at 17:17 #30515
Neil Wyatt
Moderator
@neilwyatt
4 January 2015 at 21:05 #174759
Bazyle
Participant
@bazyle
Other sizes of cone drill are available.

but 5C are so much easier to cater for.
4 January 2015 at 23:02 #174775
Michael Gilligan
Participant
@michaelgilligan61133
Neil,

Sorry if this looks like a hi-jack, but your thread seems convenient place to post:

I just found these interesting arbors & toolholders, which fit into ER holders.

MichaelG.
4 January 2015 at 23:15 #174776
mike T
Participant
@miket56243
MichaelG,

Thats interesting. Now we can fit an expensive Genswiss toolholder into an inexpensive ER collet.

Is that progress? I liked Neil's idea better.

Mike
4 January 2015 at 23:19 #174778
Michael Gilligan
Participant
@michaelgilligan61133
Mike,

I was thinking more of a DIY clone.

… it was the idea that I liked.

MichaelG.
4 January 2015 at 23:37 #174779
Bazyle
Participant
@bazyle
Makes a lot of sense. After all just the equivalent of making a morse shaped saw holder instead of a parellel shank one to hold in a morse collet. Cut out the middle man and remove one set of errors.

Following on it is interesting that we so take it for granted that a lathe spindle will have a morse taper but rarely use it as such and slap in an adaptor. It just needs someone to take the plunge and make retrofit spindles with ER noses.
5 January 2015 at 06:19 #174783
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Bazyle on 04/01/2015 23:37:29:

Makes a lot of sense. …

… It just needs someone to take the plunge and make retrofit spindles with ER noses.

.

In the little Jason lathe that I'm fettling, Brian Perris almost took that plunge [except that he was using a conventional dead-length collet]; and, of course, Watchmakers lathes commonly use collet-shaped solid arbors.

The really clever bit about this one is the way they 'twist' the solid body into the ER nose cap [which is designed to take a springy collet] …

Have hope, Bazyle; there is at least one firm doing retrofit ER headstocks for the Sherline lathe, so maybe the light will be seen.

MichaelG.

Edited By Michael Gilligan on 05/01/2015 06:20:26

Edited By Michael Gilligan on 05/01/2015 06:25:00
5 January 2015 at 10:06 #174794
Neil Wyatt
Moderator
@neilwyatt
I have played with boring the Adept spindle for ER11, but for various reasons I think MT0 will be a better solution, although I won't go quite the whole way in with the bore as it would leave the spindle nose a bit thin.

Interestingly MT3 and ER25 have very similar gauge and small-end diameters so changing over to ER25 would not be difficult, except, of course, for machines with a flange rather than a screwed nose.

Neil
5 January 2015 at 16:54 #174853
colin hawes
Participant
@colinhawes85982
I would not consider using a cone drill to produce a machine taper because only luck will give concentricity. It could be useful though for carefully cleaning up any damage. Colin
5 January 2015 at 18:37 #174863
Bazyle
Participant
@bazyle
I thought Neil's original suggestion was for a storage holder – as per the HSM forum suggestion on their 'shop made tools thread'.

BTW is _Paul_ a member here?
5 January 2015 at 19:38 #174870
Neil Wyatt
Moderator
@neilwyatt
I suppose I was think more of something I saw on a woodworking site. A light handle that took an ER16 collet at the end for holding various gouges and wood-turning tools, but although I doubt you could cut a full socket with one I think it would work as a 'poor mans finishing reamer'.

Neil
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