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Inexpensive Spindle and Chuck/Collet

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  • J Tiers
    replied
    Originally posted by lwalker View Post
    Not going to find an HF type drill press with that low runout
    Don't know why not.

    The chuck will be trash, with probably well in excess of 5 thou runout. But you weren't going to use the chuck, were you?

    The spindle and bearings are probably harder to make with bad runout than with acceptable runout, so I'd expect them to be acceptable.

    What you would do would be to attach your collet holder to the spindle in place of the chuck, and then , since you have the grinder, you can grind the collet holder to take out the last bit of eccentricity, in place, on its bearings.

    After that it should be "on" about as well as it ever will be.

    you might have more trouble finding an HF (or other) cheap drill press that actually has two bearings in the quill. Many have but one at the bottom and rely on the splines to center the spindle at top.

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  • Alistair Hosie
    replied
    I have both er 25 and er 32 collets and chucks to match if I just had the one I would opt for er 32 myself it gives you a wider range of sizes. IMHO er 32's seem to be the most widely bought and used. Alistair

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  • Paul Alciatore
    replied
    Originally posted by Paul Alciatore View Post
    Don't know if I could bring myself to butcher one. But I will keep it in mind. Perhaps an Atlas or Craftsman? I wouldn't feel so guilty.
    My hesitation was for the SB, not the 7" mini lathe. I would butcher one of those in an instant. I have a SB9 and love it.

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  • Johnh57
    replied
    I wonder if you could modify the spindle on a die grinder to accommodate an Er25 collet and holder.

    Leave a comment:


  • macona
    replied
    I have a new spindle shaft for a 7" chinese lathe lying around. A couple ball bearings and you have a basic spindle. Has a MT3 and face mount for a 3" chuck.

    Leave a comment:


  • Paul Alciatore
    replied
    Don't know if I could bring myself to butcher one. But I will keep it in mind. Perhaps an Atlas or Craftsman? I wouldn't feel so guilty.


    Originally posted by martik View Post
    South bend 9 and 10 headstocks with spindle are frequently on ebay under $100

    Little machine shop sells mini lathe headstocks and castings

    http://littlemachineshop.com/product...2299&category=

    http://littlemachineshop.com/product...1299&category=

    Leave a comment:


  • Paul Alciatore
    replied
    Yea, I would think that too. Probably more like 0.003" or more. OK for drilling holes, but probably not good enough for what I want.


    Originally posted by lwalker View Post
    Not going to find an HF type drill press with that low runout

    Leave a comment:


  • martik
    replied
    South bend 9 and 10 headstocks with spindle are frequently on ebay under $100

    Little machine shop sells mini lathe headstocks and castings

    http://littlemachineshop.com/product...2299&category=

    http://littlemachineshop.com/product...1299&category=

    Leave a comment:


  • lwalker
    replied
    Not going to find an HF type drill press with that low runout

    Leave a comment:


  • Duffy
    replied
    Obviously NOT a member of this herd! How about a cheap and cheerful 8" drill press and throw away everything you dont want. I think that HF or Princess Auto up here sell one for about $50.00. I have seen lots of them on Kijji for $25.00 to $40.00, and I even picked up a Delta at a garage sale for $25.00.

    Leave a comment:


  • RussZHC
    replied
    this little chart gives the decimal equivalents for each collet size (assuming I am reading the table correctly)

    http://www.techniksusa.com/metal/cnaerpci.htm

    looks like ER 20 should work

    an ER collet chuck is still on my "to do" list and was thinking of an ER 32 but the spindle will pass just a bit over an inch so I might go to ER40 as the ER 32 capacity is shy of that but its 3/4" is what the original 4C collet capacity was, so...
    Last edited by RussZHC; 02-21-2014, 06:23 PM.

    Leave a comment:


  • Jan Nieuwenhuis
    replied
    Originally posted by Paul Alciatore View Post
    Wow, ER collet set and a couple of bearings seems to be instantly unanimous.

    I will have to check to be sure that one series of ERs will cover the range I want.
    I am sure that the ER25 series will cover the entire range from 1 to 16mm.
    Each collet has a spanning range of 1 mm, so metric and imperial sizes can all be used.
    The ER20 series have a range up to 13 mm, so that could work too.
    Given the prices from CTC tools I think I would go for the ER25, to have some extra room on the upper side of the spanning range.

    Leave a comment:


  • Paul Alciatore
    replied
    Wow, ER collet set and a couple of bearings seems to be instantly unanimous.

    I will have to check to be sure that one series of ERs will cover the range I want.

    Leave a comment:


  • Jan Nieuwenhuis
    replied
    Originally posted by Paul Alciatore View Post
    I want to construct an inexpensive spindle with some kind of chuck or collet. It will be used to hold and rotate small parts while grinding them. My specs look like this:

    RPM: 100 - 2500, the final version will probably be one fixed speed.

    Chuck/Collet range: 1/8" to 1/2", must hold non fractional sizes.

    Axial loading: very low

    Radial (sideways) loading: low to moderate

    Concentric and runout on the part being ground: should be as low as possible - +/-0.001" or preferably better

    Axial play: +/- 0.010" or better

    I plan to use some kind of small motor and probably a belt drive to rotate it. I would prefer to use stock components, but that is not a requirement. I would like the total effort and expense to be as low as possible.

    Any thoughts and suggestions will be appreciated.
    Hello Paul,

    How about this:

    http://www.ctctools.biz/servlet/the-...CK-20MM/Detail

    I think it would be simple to use with two ball bearings to get the results you need.

    [Edit: ok, I should have noticed the other answers before I reacted....]

    Best wishes,
    Jan

    Leave a comment:


  • Jaakko Fagerlund
    replied
    ER collet chuck with straight shank, couple of deep grrove bearings with a proper spacer ring or tube between them and done. Couple of issues are that usually the collet chucks shank is with a g6 tolerance, meaning it is a 0.01 or 0.02 mm under the nominal size. If one wants to be good, one would either grind the shank down to the next bearing size (preferably two different ID bearings for ease of install) or microweld some thin feeler gauge stock on the bearing spots and then regrind it to .00 measurement or so.

    Other option is to build a Quorn type spindle. I've designed a similar spindle for a cut off machine that uses 7200 (or was it 7300) series angular contact bearings with 2RS to keep crap out, a set of 40 mm OD Bellewille washers to set about 300 N preload and the other end has a keyed HTD belt wheel on it.

    Leave a comment:

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