Hi Geoff,

Harold Hall has a nice description here for a collet chuck which will thread onto the spindle nose of your lathe rather than blocking up your spindle… **LINK**

This method can easily be adapted to make an ER20 collet chuck that will thread on your spindle nose (?) – with the same 8 degree taper which would open up the possibility to use it for holding workpieces too.

Arc Euro sell ER20 collets, nuts and spanners at reasonable prices.

HTH

Jon

One of the recent threads regarding ER collets for tool or work holding had the torque figure for correct tightening of ER nuts (or a link to it) as, IIRC, 100ft.lbs. I am surprised that with this in mind there are no spanner flats machined on the collet holder body in the link above to allow use of a large spanner for collet tightening and releasing. I know that some ER32 collet holders are supplied with suitable flats. Maybe it's the ones without flats that cause problems for some people with cutter movement during machining. I would be wary of trying to achieve this sort of torque with a tommy bar in a Ø6 hole or with a pin wrench. Insufficient tightening may lead to the unexpected movement of the milling cutter in the collet.

I know that milling in the lathe is not usually a high force, maximum metal removal rate, operation but any slipping of the cutter is clearly not welcome.

Martin

I use a 6mm bar and a C-spanner. I know the collet is tight when the bar bends. Next time, I turn the bar round and when its straight, I know the collet is tight

When the bar breaks, it will be time to get a second c-spanner.

Neil

hi I have a question which i think someone in the forums will know the answer to, I bought a myford lm7 off Ebay a few months back with some tooling which seems to suggest it was used for production, what I need to know is a bunch of collets that was with it the code on the collets is MA99E made by Hardinge it came with a quick release lever but I plan to sell it on ebay as I have no use for it, I need to know is there an adapter that will take these collets and marry up to the ml7. thanks for any info John

.

Have a look at this advert, John **LINK**

https://www.gumtree.com/p/lathes/myford-lever-collet-chuck-22-ma99e-hardinge-collets-super-7-ml7-ml7r-ml10-etc-/1211231030

That's the arrangement Myford used for the MA99E collets.

… Their other [MT2] collets were very different.

MichaelG.

Hi Roderick,

Thanks for your reply sorry I was slow getting back to you, yesterday before I seen your reply I recieved a message back from an ebay trader who is selling lots of this type of collet and to use them on a myford the qick release collet holder has to be used so I will have to sell all the collets with the qick release and buy some of the ER 32 type.

Thanks again. John