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  1. #1
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    Default Need help with a Chuck Drawing

    Looking for a chuck for my Toyo lathe and although close have not yet found any with the right PCD, chuck register etc yet.

    There is a seller on eBay who has a TOS chuck but his measurements don't make sense if this is the one he has. Says his is 23mm PCD.

    NEW TOS 65mm SCROLL BACK CHUCK Direct From Myford Ltd | eBay

    Here's the PDF of the chuck.

    http://www.tos.cz/tospdf/iux.pdf

    What I don't understand is dimension EH7. If this is E then why is it bigger than F which is the PCD. Bit confused here.

    Nev

  2. #2
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    Default

    BTW the original chuck is beyond repair. Jaws are pretty well chewed up. It has a register of 22mm and a PCD of 28mm with 3 x M4 holes for mounting. If anyone knows if they exist I will be very happy to know where they are.

    Nev

  3. #3
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    Default

    And only 4mm difference in the diameters? Something printed wrong I think.
    If you can't find a chuck to fit directly, you might have to resort to using a backplate.

    Jordan

  4. #4
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    Default

    Quote Originally Posted by nadroj View Post
    If you can't find a chuck to fit directly, you might have to resort to using a backplate.

    Jordan
    There is an adapter which apparently is suitable available (from Cowells) to addapt chucks with the Unimat 14mm thread. The thing is I want to keep it original if I can because I have the rotary table that has the same mounting system.

    Have seen chucks on the net that have a pic of the right one but when I enquire it turn out they have all changed the design and made them 12mm or 14mm mounts.

    The other idea I have is to get Unimat style chucks and then bore back for mounting and drill holes for the mounting screws but is this possible?

    Next quest will be to find the 4 jaw with a mounting PCD of 36mm. Spindle has both sets of holes.

    Nev

  5. #5
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    Default

    Quote Originally Posted by SurfinNev View Post
    Looking for a chuck for my Toyo lathe and although close have not yet found any with the right PCD, chuck register etc yet.

    There is a seller on eBay who has a TOS chuck but his measurements don't make sense if this is the one he has. Says his is 23mm PCD.

    NEW TOS 65mm SCROLL BACK CHUCK Direct From Myford Ltd | eBay

    Here's the PDF of the chuck.

    http://www.tos.cz/tospdf/iux.pdf

    What I don't understand is dimension EH7. If this is E then why is it bigger than F which is the PCD. Bit confused here.

    Nev
    The Ebay seller maybe has the PCD wrong. Have you asked him to double check.
    The Ebay pic shows that the register recess is bigger than the PCD.

    In the Tos pdf EH7 is E , the H7 would be the hole diameter tolerance. The 65 diameter chuck shows the register as bigger than the PCD so it is as the Ebay pic.

    Cheers.
    If I'm not right, then I'm wrong, I'll just go bend some more bananas.

  6. #6
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    Default

    Have not asked the seller to check PCD. Took forever to even contact him for answers to my first questions.

    A bigger register can be overcome by altering the spindle with a collar, or even an insert in the chuck I suppose. It's the PCD that the most important part.

    Looking at the eBay pics again I think that the register at 30mm and the PCD at 26mm could be about right.

    So if they sell these chucks, what are they originally intended for if the Toyo is 28mm PCD. Never come across anything that these chuck would fit. Very strange.

    Nev

  7. #7
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    Quote Originally Posted by SurfinNev View Post
    Have not asked the seller to check PCD. Took forever to even contact him for answers to my first questions.

    A bigger register can be overcome by altering the spindle with a collar, or even an insert in the chuck I suppose. It's the PCD that the most important part.

    Looking at the eBay pics again I think that the register at 30mm and the PCD at 26mm could be about right.

    So if they sell these chucks, what are they originally intended for if the Toyo is 28mm PCD. Never come across anything that these chuck would fit. Very strange.

    Nev
    If the 26mm in the Tos pdf is correct I wonder if the holes could be elongated outwards by 1mm without hitting anything(the scroll for instance) inside the guts of the chuck. I'd be thinking 1mm wouldn't hit anything surely.

    Have you tried to find any Toyo forums or similar for information as to where you may source chucks.

    Cheers.
    If I'm not right, then I'm wrong, I'll just go bend some more bananas.

  8. #8
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    Not sure if they can be elongated. Don't want to butcher it by doing that though. Never seen a forum for the Toyo stuff. Another reason I want to keep it original is because of the bore through the spindle. It is just over 12mm and by using an adapter with the M14 thread it reduces this to about 10mm. I'm really keen to get this thing back together and use it. In some ways I think it's a better lathe than the Unimat.

    Nev

  9. #9
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    Quote Originally Posted by SurfinNev View Post
    I want to keep it original if I can because I have the rotary table that has the same mounting system.
    I don't understand. If you use an adaptor to make the chuck fit your Toyo spindle, then it would also fit the Toyo rotary table?

    Jordan

  10. #10
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    Default

    Quote Originally Posted by SurfinNev View Post
    Not sure if they can be elongated. Don't want to butcher it by doing that though. Never seen a forum for the Toyo stuff. Another reason I want to keep it original is because of the bore through the spindle. It is just over 12mm and by using an adapter with the M14 thread it reduces this to about 10mm. I'm really keen to get this thing back together and use it. In some ways I think it's a better lathe than the Unimat.

    Nev
    Hi SurfinNev, If correct chucks are in the realms of unobtanium then I'd be getting one of the Tos ones from the Ebay seller, pulling it apart and as per my previous post seeing if it's PCD could be taken out from 26mm(if that's what it is) to the 28mm you require, it only means elongating the holes 1mm outwards. I consider that a minor butcher if that was the size of chuck I wanted and couldn't find the correct chuck. Done carefully it wouldn't look butchered anyway. If elongation of the holes is impossible due to interference with any internals then you could reassemble it and put it up on Ebay in Aus.

    You could make an adapter for a non screw on chuck, though I can understand not wanting an adapter as you would have to remove the 3 screws from the front mount chuck so you could remove the 3 screws of the adapter to remove it from the spindle nose when you wanted to mount the 4 jaw with the 36mm PCD.

    You could though make the adapter so the bolts for the 36mm PCD goes through the adapter straight into the nose of the spindle. It would be a double adapter. It would still suit your other device. Trouble with adapters on short lathes you are losing length capacity which is in short supply to start with.

    You said your original chuck has a register of 22mm so is there a bigger section on the spindle nose for the 36mm PCD of the 4 jaw or does it also have 22mm register.


    Cheers.
    If I'm not right, then I'm wrong, I'll just go bend some more bananas.

  11. #11
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    I doubt I can get the TOS chuck to fit because it has M5 (M5.5 clearance) holes. Spindle has M4.

    Now thinking about a Sherline chuck with the 3/4-16 thread. Bore out the thread to the 22mm and drill mounting holes if there's enough metal on back of chuck to get the 28mm PCD. I could do this to both the 3 and 4 jaw Sherline. 36mm PCD on the 4 jaw.

    Looked at my Unimat chuck and it is only 30mm diameter on the back. The Toyo is 35mm.

    Nev

  12. #12
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    Quote Originally Posted by SurfinNev View Post
    I doubt I can get the TOS chuck to fit because it has M5 (M5.5 clearance) holes. Spindle has M4.

    Now thinking about a Sherline chuck with the 3/4-16 thread. Bore out the thread to the 22mm and drill mounting holes if there's enough metal on back of chuck to get the 28mm PCD. I could do this to both the 3 and 4 jaw Sherline. 36mm PCD on the 4 jaw.

    Looked at my Unimat chuck and it is only 30mm diameter on the back. The Toyo is 35mm.

    Nev
    Any chance of a pic of the spindle snout, somehow I got the impression that the snout was drilled and tapped in the face to take front mount chucks.

    Cheers.
    If I'm not right, then I'm wrong, I'll just go bend some more bananas.

  13. #13
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    Here's the pic of spindle nose.

    Nev

  14. #14
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    Bugger! Looks like back of Sherline is only about 30mm as well.

    http://www.sherline.com/images/chuckplan.jpg

    Nev

  15. #15
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    Quote Originally Posted by SurfinNev View Post
    Here's the pic of spindle nose.

    Nev
    Can't quite tell; the spindle nose holes are threaded? You said they were M4 so take it that you meant M4 meant 4mm ISO thread.

    Tos chuck could still be a candidate anyway. Assuming that the Tos chuck is 26mm PCD. You would have to put a thin sleeve in the back of the chuck to bring it down to snout register diameter as you previously said.

    Seeing as the holes in the Tos are 5.5mm diameter you would only have to elongate the holes in the chuck slightly outwards(1/4mm) to get your 4mm screws to fit in the 28mm PCD of the snout. With a bit of care the 1/4mm could be done neatly with a rat tail file.
    The counter-bored holes in the chuck for the head of the screws could be neatly elongated outwards slightly with a slot drill or end mill. They may also be deep enough to allow a thin washer to fit in under your screw heads or you could make up 3 screws with bigger diameter heads and thus be able to do without a washer. Upon reflection I suppose you are going to have to make or source new screws anyway. Silver steel screws with a slotted head could be hardened and tempered and would do the job admirably and the slots would stand up well, or you could just opt to make screws out of silver steel, medium or high tensile steel and leave without any heat treating.

    Did the original fixings have socket head or slotted head screws, doesn't matter really as slotted head screws would be adequate anyway.

    Am feeling your pain with your dilema

    Not quite sure how you intended to fit the Sherline chuck. Maybe by threaded holes in the back of the chuck and attachment screws coming in from behind the flange of the snout, but aren't those holes threaded M4.

    Cheers.
    If I'm not right, then I'm wrong, I'll just go bend some more bananas.

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