modifying ER collet holder

modifying ER collet holder

This topic has 7 replies, 5 voices, and was last updated 16 April 2014 at 12:58 by Douglas Johnston.

Viewing 8 posts - 1 through 8 (of 8 total)

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15 April 2014 at 13:13 #149888
Douglas Johnston
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@douglasjohnston98463
I want to use an ER32 collet holder with 1 inch parallel shaft to sharpen larger size drills on a Quorn grinder.CTC in China sell them at a very cheap price but the bore through the 1 inch diameter shaft would need to be enlarged to be useful.

Does anybody know if this type of collet holder tends to be too hard to bore out with carbide tooling?

Doug
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15 April 2014 at 13:13 #23252
Douglas Johnston
Participant
@douglasjohnston98463
15 April 2014 at 13:39 #149891
Roderick Jenkins
Participant
@roderickjenkins93242
Doug,

I've trued up an ER collet holder that had an unacceptable run out (not from CTC) and I've turned down a collet nut to reduce its diameter. Both were tough but doable with QC carbide tipped tooling.

cheers,

Rod
15 April 2014 at 19:46 #149916
Tomk
Participant
@tomk39956
Doug

There is a company in Glasgow the sells Er Collet straight shank chucks.

I have a couple of these and the material is tough but can be machined. I have not tried to machine the bore but the shafts can be machined.

Tom

Edited By TomK on 15/04/2014 19:47:21
15 April 2014 at 20:08 #149918
Oompa Lumpa
Participant
@oompalumpa34302
Thanks for the link Tom, they have a terrific selection of threading inserts.

graham.
16 April 2014 at 10:10 #149955
Douglas Johnston
Participant
@douglasjohnston98463
Thanks for the replies, I will go ahead and take the risk and see if I can increase the bore. That link that Tom provided is very interesting and is a company I was unaware of,I must take a look next time I am in Glasgow.Unfortunately they only list an ER32 straight shank collet holder with a shank diameter of 32mm and I need a diameter of 1". Their prices are quite good though and no long wait from China.

Doug
16 April 2014 at 11:30 #149967
John Haine
Participant
@johnhaine32865
Douglas, it's very easy to make ER collet holders and for this purpose it wouldn't need to be hardened. The closers are available cheaply as well. I've posted here somewhere on how to set up the topslide taper for a collet to make the taper in the holder.
16 April 2014 at 12:58 #149971
Douglas Johnston
Participant
@douglasjohnston98463
You are quite right John, I have made some in the past myself and it would get round the problem of being too hard to cut. It is just that they are so cheap from CTC and I bought a smaller sized one a while ago from them and it was very nicely made. By the time I bought a closer and a hefty chunk of steel in the UK I could well have spent more than a very nicely made one from China. The global economy can be a bit crazy!

Doug
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