ER32 Myford Collet Chuck

[JohnFParticipant @johnf59703]

At the MidlandsExhibition I purchased a Myford fit ER32 collet chuck and a set of collets from RDG

However I was a little sceptical of the accuracy quoted [due to previous experience with imported tools] for the chuck but I must say I am delighted—it runs with 0.0001” TIR or less than! Just a flicker on my dial gauge and the collets are well within the DIN tolerance. It runs “Bob On” and you have the added advantage of the 20mm capacity for short components. Had it on and off the lathe a few times to amke sure it was not a fluke but it is always the same–delighted!

I have no connection with RDG other than a satisfied customer–hope you find this info useful

http://www.rdgtools.co.uk/acatalog/MYFORD_LATHE_USERS_NEW1.html

[JohnFParticipant @johnf59703]

[Chris TriceParticipant @christrice43267]

I bought a Soba one to fit my Myford that was so awful I just chucked it in the bin since you couldn’t do anything with it. Myford offered their own ER25 version that came with its own separate backpiece you could machine fitted to your particular lathe so that when you bolted the front section on, it runs spot on. In hindsight I should have gone with ER32 but I commited to a set of Vertex ER25 collets (excellent) so I’ve just stuck with 25 size throughout. In truth I can count on one hand the times I’ve used them on the lathe but they get used 95% of the time with my milling machine.

[Ex contributorParticipant @mgnbuk]

I bought a Soba one to fit my Myford

 

I bought one of those at Harrogate – don’t know how good the runout is as it doesn’t fit the spindle register (too tight). Finish doesn’t appear too bad, but I have not had the time or inclination to lap the register to get it to fit on the machine.

 

I suppose it is better to have it a bit too tight than loose – at least it should be possible to get a good fit with a bit of effort.

 

Nigel B.

[Douglas JohnstonParticipant @douglasjohnston98463]

As a matter of interest John did you buy the chuck and collets seperately or the set of chuck and collets in a case? There may be no difference in quality, indeed the items may be identical but I am a little wary and was wondering which way to go.

Doug

[Chris TriceParticipant @christrice43267]

In my case, I already had the collets so just bought the chuck. Mine was a little tight too but the deal breaker was the runout was worse than my scroll chucks. What’s the point of a collet chuck if it fails to perform its reason for existence? Although the exterior surfaces aren’t important, confidence was not inspired either by watching the exterior visibly wobble as it went around. I couldn’t be bothered to send it back but it doesn’t matter because the damage is done. Soba products are out of my frame.

[NJHParticipant @njh]

Hi Nigel

 

You say “it doesn’t fit the spindle register (too tight) ” “lap the register to get it to fit on the machine” First I assume you are not intending to lap the spindle ? ( just checking!)

 

I bought one of these a while ago and thought, like you, that it was too tight a fit and I couldn’t get it as far as the register. I gave the register and nose thread a good clean and applied some oil to both the spindle and the inside of the adapter. With a bit of patience and persistance it went on.

It is crucial to get it lined up correctly first. I put a piece of 8mm (say) silver steel in my tailstock drill chuck and an 8mm collet in the chuck but don’t tighten it. Bring the tailstock with the collet up to the spindle and it is aligned spot on.

I’m really pleased with my Soba collet chuck the run-out, taken on the inside of the chuck taper, is really not measureable – just the slightest flicker on my clock.

 

Persevere I’m sure you will be delighted in the end!

 

Regards

 

Norman

[Gone AwayParticipant @goneaway]

I have a Soba collet chuck for my ML7 and have exactly the same experience as Norman. It often feels like it won’t go on, that it’s way too tight. You have to make sure the nose is quite clean and then get the chuck just right and it goes on smooth as you like. It’s that close-fitting (which it needs to be I guess).

 

I would think long and hard before you resort to lapping.

[Ex contributorParticipant @mgnbuk]

First I assume you are not intending to lap the spindle ? ( just checking!)

I will freely admit to being a bit daft on occasions, but I’m not that daft !

I would think long and hard before you resort to lapping.

 

I had a closer look & a measure-up this evening. The collet chuck body starts to go on the spindle, but goes tight with around a 5mm gap to the spindle register face.

 

My Super 7 is a mid-60s built, ex-school machine that doesn’t appear to have had much use * – the original rust preventative was still present in the spindle taper & the spindle nose appears as though “just ground”. The register measures around 1.2499″ as near as I can read a Starrett 0-2″ mic that zeros correctly against it’s 1″ standard – that is visbly under 1.2500″, but by barely the width of the fiducial line. The register appears parallel along it’s length.

 

Using an M&W telescopic bore gauge & the Starrettt mic, the collet chuck register bore appears to be around 1.2505″ diameter. By feel the bore is pretty parallel. Comparing the gauge set in the collet chuck with the 3 jaw chuck backplate bore, the backplate is a very slightly tighter fit.. As the collet chuck goes tight before the apparently big enough, apparently parallel bore has seated, that suggests to me that the problem is with the thread.

 

Looks like I have the perfect excuse to “invest” in a Myford nose thread tap !

 

Nigel B.

 

* It must have had the chuck changed at some point in it’s life though – there is a “chuck jaw end ” shaped ding in the rear shear close to the chuck. Butterfingers !

 

Reminder to self – always use the chuck board !

[JohnFParticipant @johnf59703]

Hi All,

Just an observation but it seems to me that all the problems are with another brand of chuck—not RDG.

 

When I was speaking to the owner at the show he told me that all their tooling was made to DIN standard and mostly in India this being the case one would expect any of their chucks to perform and fit correctly.

 

Regarding Douglas’s question no they were not a “set” just bought at the same time because of a show deal.

John

[geoffParticipant @geoff]

Hi all I have now tried three 32mm collet chucks but none of them have fit my myford spindle at all

Geoff

[_Paul_Participant @_paul_]

I understand it may not suit everyone but making your own ER32 chuck isnt that hard IMHO and if made on the machine it is to be used on you are assured of the best concentricity.

I'm sure John Stevenson (Sir John) posted a diagram on here somewhere if you wanted to go that route.

Regards

Paul

[NJHParticipant @njh]

Geoff

In what way don't they fit your spindle? If they are designed for the Myford spindle nose then they should fit. As I posted above though when I first got my ER25 chuck I couldn't get it to fit and was sure that it must be faulty! The fit of this chuck is very close and must be offered up precisely to get it onto the spindle. Have you tried the technique I mentioned to align the chuck by means of a rod held in the tailstock chuck?

Norman

[Chris HeapyParticipant @chrisheapy71135]

I bought a Myford ER32 set from Glostertools, not very impressed with the TIR to be honest. I recently got a couple of ball-bearing closing nuts and meant to test it again but so far haven't bothered. I have an R8 ER32 chuck from RDG and the collets seem to be fine used in that so I suspect it is the chuck at fault. It doesn't appear to be well hardened anyway. My new 6-jaw is more accurate than the collet set.

[Michael GilliganParticipant @michaelgilligan61133]

Nigel & Geoff,

There is some useful discussion about the Myford register diameter, on an earlier thread.

I think it worth checking what [very slight] taper exists on your register.

MichaelG.

[geoffParticipant @geoff]

Hi all thanks for your comments and I have not tried your method norman but I did previously read about it although I cannot see the chuck fitting as it is so tight on the spinle nose thread at the start of the thread

Geoff

[Claus HansenParticipant @claushansen90462]

Hi

I purchased the ER 32 collet chuck fro Myford.co.uk.

The collets are from Rego-Fix.

But the fit, or missing fit, on the register, makes it almost useless.

The runout are around 30 my. And it is very depent of the torque when you screw it on the spindle.

The runout on the spindle itself, is around 5 my.

I think it is better to make my own, as descibed in several articles.

DON't buy it!!!

[Clive IndiaParticipant @cliveindia]

Posted by JohnF on 25/10/2011 11:39:46:At the MidlandsExhibition I purchased a Myford fit ER32 collet chuck and a set of collets from RDG

However I was a little sceptical of the accuracy quoted [due to previous experience with imported tools] for the chuck but I must say I am delighted—it runs with 0.0001” TIR or less than! Just a flicker on my dial gauge and the collets are well within the DIN tolerance. It runs “Bob On” and you have the added advantage of the 20mm capacity for short components. Had it on and off the lathe a few times to amke sure it was not a fluke but it is always the same–delighted!

John, just to say I had a similar experience when I standardised on ER32 for lathe, mill and Quorn. works very well for me.

[AjohnwParticipant @ajohnw51620]

I bought one of the one piece units that screw directly on rather than having sort of back plate fitting. My conclusion was that they hadn't aligned the register to the collet taper so the run out was pretty bad. Hard to be entirely sure why but the thread being of centre wouldn't help.

I do know from a long time ago that suppliers were having problems with that type and hoped that they had sorted them out.

The actual collet holder on the 2 piece ones are available from several sources including Arc. I wanted mine for milling on a DW.

John

–

[Claus HansenParticipant @claushansen90462]

It seems that the part that screws on the nose, are fitting badly (sloppy) on the register.

It feels more sloppy than any of my 3 chucks.

And can be veryfied with marking blue.

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