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Myford extension for spindle.

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old mart31/05/2021 18:23:06
3524 forum posts
217 photos

I have just come across this ebay listing for a Super 7 spindle extension, I recon it is 70mm effective length. What would it be usd for?


Brian Wood31/05/2021 18:36:40
2498 forum posts
39 photos

Old Mart,

To guide swarf out of the bore and through the hole in the change wheel door, rather than have it falling into the change wheels inside the cover.



Brian Wood31/05/2021 18:40:21
2498 forum posts
39 photos

Oh, sorry, the extension is to the spindle nose. I assumed, without checking, that it would be as I described.

I'm sorry, I can't help with a use for an extension this way round.



Robert Butler31/05/2021 18:40:35
338 forum posts
6 photos

I don't think so! It is solid and seems to replicate the Myford nose thread, swarf's going no where using that device.

Robert Butler

Steviegtr31/05/2021 18:52:44
2320 forum posts
317 photos

How do you drive the myford milling machine attachment.


Robert Butler31/05/2021 18:59:56
338 forum posts
6 photos

The Rodney uses a 2MT adaptor with a gear fitting which fits into a Nylon? drive coupling. Not sure on other types but why would you fit a chuck or collet and then a duplicate Myford nose adaptor? The Amolco as far as I can recall is self powered.

Robert Butler

Pete Rimmer31/05/2021 19:03:34
1127 forum posts
70 photos

I'd like to know how concentric the bore and OD are.

Robert Butler31/05/2021 19:10:41
338 forum posts
6 photos

The Rishton attachment is self powered, as is the Amolco.

Peter that may be its purpose, machining eccentrics.

Robert Butler


Edited By Robert Butler on 31/05/2021 19:11:10

old mart31/05/2021 19:14:41
3524 forum posts
217 photos

An extension will loose the stiffness and be subject to some runout and will only be good rather than very good on any spindle other that the one it had the male threads and register produced on. That one must be a one off made for a special job, but what that job was defeats me.

Martin Kyte31/05/2021 19:24:31
2638 forum posts
46 photos

Thats a Myford spindle nose blank. It's machined identical to the nose on your lathe with centres either end for conversion into the arbor of your choice. I used a couple when I built my GHT Versatile dividing head so that it would take Myford chucks.

It's just badly advertised. I hope it's not as badly made.

regards Martin

old mart31/05/2021 20:03:32
3524 forum posts
217 photos

There is no photo showing any female thread, which fooled me as I assumed there was.

Swarf, Mostly!31/05/2021 20:19:45
623 forum posts
67 photos

Hi there, all,

If you were making (for example ) Harold Hall's ER32 collet chuck to screw on to the ML7 or Super 7 mandrel, it would be useful to have such a facsimile of the mandrel nose to periodically check progress. That assumes that the facsimile is accurate.

It would avoid having to perodically unscrew the lathe chuck, complete with work-piece, and turn it around to try the job on to the actual lathe mandrel.  The same rationale applies to machining a chuck back-plate.

Of course, if one trusted one's skill and measuring equipment, one would machine the job by dead reckoning.

I prefer the facsimile.  One of the Myford ML7/Super 7 accessories is/was such a mandrel nose facsimile on an MT2 taper shank.  I have two but I've never clocked either of them to check their accuracy.

Best regards,

Swarf, Mostly!

Edited By Swarf, Mostly! on 31/05/2021 20:22:43

Edited By Swarf, Mostly! on 31/05/2021 20:23:54

Michael Gilligan31/05/2021 20:26:00
19604 forum posts
997 photos

I see from the ‘Item details’ that the ‘Brand’ is Boxford

... perhaps he just held it in the 3-jaw and attached Myford accessories devil


old mart31/05/2021 20:33:12
3524 forum posts
217 photos

One thing has just occured to me regarding chucks screwed onto dividing heads, or rotary tables, is the danger of the chuck unscrewing if the cutting forces are in the wrong direction. This is certainly a factor with lathes if nothing is done to lock the chuck.

peak431/05/2021 21:51:42
1597 forum posts
172 photos
Posted by Michael Gilligan on 31/05/2021 20:26:00:

I see from the ‘Item details’ that the ‘Brand’ is Boxford

... perhaps he just held it in the 3-jaw and attached Myford accessories devil


I have something similar, but smaller diameter, which is a direct fit into my 5C collet chuck on the Warco 1330, so I can use a Myford mount chuck on it.
This would fit a larger collet system, and allow the same facility.
Alternatively, if one is making a faceplate or backplate, it's often advised to make a dummy spindle, so you can check the fit of the workpiece.


Zan31/05/2021 22:07:02
301 forum posts
20 photos

Would be very useful when using my Myford captain thus allowing use of the cross slide for cutoff on my short bed S7

bernard towers31/05/2021 22:16:12
401 forum posts
102 photos

I’ve got one of those, always assumed it was Myford it’s accurately made and have used it on the mill in various ways

Mike Hurley01/06/2021 09:44:00
249 forum posts
80 photos

Use something similar on my rotatry table for holding a spare myford chuck. Just have to be careful on direction of feed / cut to avoid it unscrewing. The plain part is locked in situ with a couple of screws. Only use very occasionaly anyway.

larry phelan 101/06/2021 16:41:44
1141 forum posts
14 photos

Old Mart,

The chucks for the Craftsman lathes are screwed on and held there by means of two simple clamps.

Simple idea, and I never had one come loose no matter what direction the lathe ran.

Mark Kilgore06/06/2021 17:21:52
9 forum posts

That spindle blank was originally designed for holding a chuck, with workpiece, in a bench vise for filing or whatever. It was so described in early Myford catalogs.

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