capstan socket : why so expensive ?

Happy New Year.

Can you please help me with some keywords for google / ebay searches.

AM looking for a MT3 socket inside a straight sleeve, without being inundated by MT3/MT2 conversion sleeves etc.

Google helped me to find "capstan socket" but they seem to be relatively expensive + killer postage given that very similar things like MT3/MT4 converters cost far less. Maybe its simply an economy of scale with far more demand for the cheaper items.

https://www.ebay.com.au/sch/i.html?_...ocket&_sacat=0

Any other keywords that might find a straight shaft with an MT3 socket inside it please ?

Why ? Have realised that at times it might be convenient to be able to mount an MT3 ER32 collett chuck inside dividing jig on mill.

Found this thread re DIY MT3 sockets but it sounds like a lot of work to do it properly, and need to buy MT3 reamers.

Machining morse tapers ( internal)

Another option seems to be a MT2 taper to MT3 socket and cut the MT2 off the end of it. But the finish on the outside of the socket might be rubbish.

MT3 to MT2 Morse Taper Adapter Drill Sleeve No. 3 to No. 2 | eBay


Bill

Bill,

It may be better to go straight from parallel to ER32.
It would certainly be much easier to make without MT tapers involved.

Andrew.

Something like this looks too cheap for me to want to try making one.
https://www.ebay.com.au/itm/202048175890

Thanks Gents,

I guess I was kind of blinkered by the fact that my current ER32 collett chuck came complete with MT3 taper and the mill and lathe are both MT3 tapers. Will ponder for a bit regarding straight shanks.

Quick aside - kind of related, but not really ....

I know some people mount their drill chucks on a straight shanks and then hold that straight shank in an ER collet, means less changing of the taper and drawbar.

And I know some people use drill bits in their ER colletts bypassing need for jacobs chuck.

Off to replace some rotten wood on the verandah and think a bit ..... thanks again.

Bill

Quote:

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Originally Posted by steamingbill

...Another option seems to be a MT2 taper to MT3 socket and cut the MT2 off the end of it. But the finish on the outside of the socket might be rubbish.

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For me the concern would be concentricity - the MT2 taper and the MT3 socket should be concentric, but I would not necessarily put money on the OD of the socket being spot on concentric with the socket.

The straight ER chuck looks to be the better option.

Michael

Am still interested in these sleeves for various reasons.

FYI : Best I could do is this one https://www.chronos.ltd.uk/acatalog/info%5fSOL11%2ehtml @ $14ish but then add postage UK to Aus and its a fortune.

Some also available at good prices in USA but again postage is an issue.

Anybody seen any available on ebay / alibaba / bang good ? I had a look but couldn't find any - kept getting swamped with the search engine giving me zillions of mt3/Mt2 conversion sockets.


Bill

This guy is out of MT3 stock at the moment but a possibility -
ü1 C..-MTA. Straight shank ADAPTER 20,25,32mm shank | Morse taper inside MT1,2,3 | eBay
(try searching on 'morse straight adaptor')

Michael

https://www.ebay.com.au/itm/322260140171

Just use an R8 mt3 drill holder

Quote:

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Originally Posted by steamingbill

Why ? Have realised that at times it might be convenient to be able to mount an MT3 ER32 collett chuck inside dividing jig on mil
Bill

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Bill,
Are you proposing to mount a 3MT collet chuck in a 3MT socket and use it to hold a work piece in the chuck for milling? If so, when you then apply milling side forces to it, won't you still need either a draw bar/draw bolt for the chuck or a tailstock centre applied to the work piece to stop the chuck taper working loose in the socket?

Frank.

Quote:

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Originally Posted by franco

Bill,
Are you proposing to mount a 3MT collet chuck in a 3MT socket and use it to hold a work piece in the chuck for milling? If so, when you then apply milling side forces to it, won't you still need either a draw bar/draw bolt for the chuck or a tailstock centre applied to the work piece to stop the chuck taper working loose in the socket?

Frank.

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Thanks Frank,

The two jobs I had in mind were

1. Make a ball turning jig with my MT3 mounted boring bar - have since found a workaround for this - discovered that the MT3 taper unscrews (didn't realise that) and I can make another straight bar to screw into the back of the boring head.

2. Was making an adaptor - basically a hollow tube with two square notches carved out of one end, the workpiece was mounted on an MT3 taper mounted in lathe headstock - workpiece was then turned on the lathe. Realised that it might be handy and useful in the future to be able to mount a job like this on my mill either in dividing jig or vice or on table etc. and as you suggest this would need some sort of (tiny) drawbar.

Workaround for this current job was simply to do the job with a hacksaw and a file.

I can get a bit blinded by the idea that I need to do everything with fancy tools - sometimes I realise its time for a reality check and have a go with simple tools.

I would still like a MT3 socket inside a straight tube but no hurry - ideally would like to pay same price as an MT3/MT4 adaptor.

Bill

Hi Frank,

I was in "Barretts Tools" on Monday. They do mostly second user tooling, they have hundreds of 1" inch capstan lathe sockets. They are in the UK so carriage might be an issue, but they respond to Email and might be able to help.

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