er32 collet holder

This topic has 16 replies, 12 voices, and was last updated 30 May 2013 at 19:19 by Sub Mandrel.

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29 May 2013 at 15:45 #120921
Notlob
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@notlob
I have a warco vmc milliing machine. The problem is on this machine is the spindle b

e locked, my er32 chuck just rotates with the spindle.. Anyone gt any solution to this.

Edited By Notlob on 29/05/2013 16:17:11
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29 May 2013 at 15:45 #37591
Notlob
Participant
@notlob
29 May 2013 at 15:54 #120922
Chris Heapy
Participant
@chrisheapy71135
There should be a hole in the body of the chuck to accept a bar – I use a screwdriver pushed through. Hold it with that whilst you tighten the nut.
29 May 2013 at 16:15 #120924
joegib
Participant
@joegib
Posted by Chris Heapy on 29/05/2013 15:54:15:

There should be a hole in the body of the chuck to accept a bar …

— or 2 flats on the chuck body to take a spanner. You hold that element with one spanner and tighten the nut with another spanner (either a conventional spanner if the nut has flats or a C-spanner if it has notched indents).

Come to think of it, machine spindles that have a locking mechanism are the exception rather than the rule.

Joe

Edited By joegib on 29/05/2013 16:19:48
29 May 2013 at 16:18 #120925
JasonB
Moderator
@jasonb
Or a knurled ring on the holder body which you hold with one hand and a C spanner on the nut which is what I have.

J
29 May 2013 at 16:20 #120926
Notlob
Participant
@notlob
The chluck body has no flats, it is just round

And my bridgeport the spindle can be locked

Edited By Notlob on 29/05/2013 16:21:52

Edited By Notlob on 29/05/2013 16:35:12
29 May 2013 at 16:39 #120930
Les Jones 1
Participant
@lesjones1
Hi Notlob,
How do you prevent the spindle turning when tightening the draw bar ?

Les.
29 May 2013 at 16:42 #120931
Windy
Participant
@windy30762
I have a Warco VMC with a ER32 chuck supplied by them and no means to lock it when tightening the nut.

It is not like a Vertex one I have with spanner flats (different taper)

I used a carbide end mill to create some spanner flats on the Warco ER32 chuck.

Paul
29 May 2013 at 16:49 #120933
Notlob
Participant
@notlob
And I was a toolmaker for 35 years
29 May 2013 at 17:03 #120936
Notlob
Participant
@notlob
When I pointed this out to Warco their reply was ther is no way to lock the spindle so tough
29 May 2013 at 17:36 #120940
Tony Pratt 1
Participant
@tonypratt1
On my Myford VME vertical milling m/c there was no means of locking the spindle so I made one! Underneath the large front pulley there are a series of what I presume are balancing holes, it was a simple matter to knock up a block and sliding pin to locate in one of these holes whilst tightening the draw bar.

It may be that the Warco VMC has something similar?

Tony
29 May 2013 at 18:37 #120946
Notlob
Participant
@notlob
I probably will have to buy another collet holder one with spanner flats
29 May 2013 at 19:30 #120952
Mustafa B. Adday
Participant
@mustafab-adday34743
I never tighten my collet chucks in the machine. Either using a dedicated holder (screwed to the bench) or the vise with alu jaws.

regards, M.B.A..

Oh, that speeling!

Edited By Mustafa B. Adday on 29/05/2013 19:31:25
29 May 2013 at 20:00 #120956
Old School
Participant
@oldschool
Notlob, You should be able to hold the spindle with an oil filter type wrench with a rubberised fabric strap.
29 May 2013 at 20:24 #120959
Trevor Drabble 1
Participant
@trevordrabble1
Notlob,

I faced exactly the same problem as yourself with my ER32 holder, but since one of the reasons I chose my Myford VMB milling machine was because of the 3000 RPM top speed, the solution was relatively simple. I modified an R8 stub arbour to accept a grinding wheel I had in stock , then set up the collet holder vertically onto an angle plate on the milling macine table, protected all exposed machined surfaces, installed a front safety guard for myself, and then, ensuring I was below the MOS, ground a pair of flats on the holder body to suit a Clarkson collet chuck spanner I had in stock.. One thing I did particularly ensure was that I only presented the holder to the wheel AGAINST the direction of rotation since I did not want it to grab.

Hope you will find this info of some use.

Trevor.
30 May 2013 at 02:07 #120994
Gone Away
Participant
@goneaway
My ER-25 chuck has the same problem. At the top of the mill there is a tubular nut with flats on it that the drawbar jacks against when releasing. I used to do that nut up as tight as I could and hold it with a wrench when tightening/loosening the collet nut.

That was OK when tightening the collet nut of course. As with all my ER chucks, I don't overdo the chuck tightening – just a little nip – nonetheless at intervals when loosening the collet nut, the top nut would loosen and I'd have to remove the whole chuck and put it in the vice with soft-jaws to undo it.

Then I bought an ER-32 chuck which had proper flats on it which I prefer anyway since the size range suits me better and I rarely use the ER-25 any more.

Edited By Sid Herbage on 30/05/2013 02:08:40
30 May 2013 at 19:19 #121061
Sub Mandrel
Participant
@submandrel
is the body of your chuck hardened? If not, why not drill three holes for a tommy bar?

If it is hard, a carbide drill might still drill it.

Neil
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