Myford extension for spindle.

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?

**LINK**

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.

Regards

Brian

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.

Regards

Brian

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

How do you drive the myford milling machine attachment.

Steve.

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

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

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

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.

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

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

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

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

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

MichaelG.

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.

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.

Bill

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

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

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.

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.

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.