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  1. #1
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    530

    Default 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

  2. #2
    Join Date
    Oct 2009
    Location
    Upwey VIC
    Posts
    157

    Default

    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.

  3. #3
    Join Date
    Aug 2015
    Location
    Melbourne
    Posts
    37

    Default

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

  4. #4
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    530

    Default ER32 collets & tapers & straight

    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

  5. #5
    Join Date
    Oct 2011
    Location
    Burnie/ Adelaide
    Age
    53
    Posts
    4,572

    Default

    Quote Originally Posted by steamingbill View Post
    ...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.
    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

  6. #6
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    530

    Default Found some solid MT straight sockets

    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

  7. #7
    Join Date
    Oct 2011
    Location
    Burnie/ Adelaide
    Age
    53
    Posts
    4,572

    Default

    This guy is out of MT3 stock at the moment but a possibility -
    ΓΌ1 C..-MTA. Straight shank ADAPTER 20,25,32mm shank | Morse taper inside MT1,2,3 | eBay
    (try searching on 'morse straight adaptor')

    Michael

  8. #8
    Join Date
    Aug 2015
    Location
    Melbourne
    Posts
    37

  9. #9
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    19

    Default

    Just use an R8 mt3 drill holder

  10. #10
    Join Date
    Oct 2008
    Location
    Cairns, Q
    Posts
    485

    Default

    Quote Originally Posted by steamingbill View Post
    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
    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.

  11. #11
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    530

    Default

    Quote Originally Posted by franco View Post
    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.
    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
    Attached Images Attached Images

  12. #12
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    1,631

    Default

    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.

    Welcome to RDBarrett - New & Used Engineers Tooling



    Best Regards:
    BaronJ.

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