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Another ER32 chuck question..

MT4-ER32 chuck wanted..

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John Hall 703/06/2020 21:50:46
56 forum posts

I’ve just purchased a MT4-ER32 chuck for my Warco 250 lathe ...it’s got a 3thou runout on the collet taper which I find pretty poor for a tool designed for accurate work..

.The morse taper in the lathe spindle has almost no runout and the morse taper on the chuck body where it sticks out from the spindle reads the same.....the outer body of the chuck reads the same as the collet taper..3thou runout...

It’s being returned to the seller,

my question is...Where can I buy one that is guaranteed to be accurate?

cheers

old mart03/06/2020 22:00:42
1795 forum posts
138 photos

That is bad, I bought a cheap er25 on an R8 shank and it had 0.002" runout, but kept it. Later I bought another cheapie from another ebay source and it is better than 0.0004". Of course, R8 shank ones are much easier to get than MT4, but you could try your luck with another vendor, I notice ARC have all the sizes except MT4, but there are two on ebay for drawbars. RDG Tools have them.

Edited By old mart on 03/06/2020 22:12:05

Edited By old mart on 03/06/2020 22:15:35

Barrie Lever03/06/2020 22:57:04
596 forum posts
61 photos
Posted by John Hall 7 on 03/06/2020 21:50:46:

I’ve just purchased a MT4-ER32 chuck for my Warco 250 lathe ...it’s got a 3thou runout on the collet taper which I find pretty poor for a tool designed for accurate work..

.The morse taper in the lathe spindle has almost no runout and the morse taper on the chuck body where it sticks out from the spindle reads the same.....the outer body of the chuck reads the same as the collet taper..3thou runout...

It’s being returned to the seller,

my question is...Where can I buy one that is guaranteed to be accurate?

cheers

John

I bought some INT30 ER25 holders from Kemmler Prazion in Germany, superb quality and attention to detail and they were 51 euro's each

**LINK**

Their MT4 ER 32 is somewhat more expensive though.

Even the nut had counterbalancing in the castellation to offset the out of balance from the internal retaining lip that picks up in the collet.

I would not go anywhere else now.

Regards

Barrie

Thor04/06/2020 09:46:21
1231 forum posts
37 photos

Hi John,

Several years ago I bought a Chinese MT 3 ER-32 chuck that I can use both on my small lathe and in the milling machine. The run out on the inner taper of the ER part of mine is slightly less than 0.01mm, so the run out on your chuck is bad and should be returned.

Thor

Vic04/06/2020 10:12:06
2500 forum posts
14 photos

It’s best if you can get a flange mount chuck for your lathe if you can. This means you can pass long stock right through the chuck and head stock spindle. This is the type of thing:

Chuck

John Hall 704/06/2020 10:39:39
56 forum posts

That’s exactly what I’m doing Thor...

im heading that way Vic...I just fancied the morse tapered one for ease of use, .. up finding a good one is not easy..very few uk suppliers have them, and those that do are quite expensive...you get what you pay for..

Vic05/06/2020 15:06:40
2500 forum posts
14 photos

I’ve got a number of ER 32 Chucks. Flange for the MW lathe, MT3 for the mill and MT2 for the WW lathe.

John Hall 705/06/2020 15:58:20
56 forum posts

Where did you buy them from Vic?...and are they accurate?

cheers

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