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1018 cold rolled lathe chuck key

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by umahunter, Apr 20, 2017.

  1. umahunter

    umahunter United States Active User Active Member

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    Was gonna make up a extra chuck key outta some spare cold rolled was wondering if heating up to red hot then oil quenching would add some durability any thoughts? ??
     
  2. dulltool17

    dulltool17 United States Active User Active Member

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    Nope. Not enough Carbon.
    You could case harden, though.
     
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  3. scwhite

    scwhite United States Active Member Active Member

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    Not enough carbon
    You will be better off to go to a steel supplier and order you some 4140 and make you one
    You can buy it 29 to 30 RC . It will machine easy enough . And is still hard enough .
    Or just go it tractor Supply and buy a Grade 8
    Bolt . Machine you one out of that .
     
  4. umahunter

    umahunter United States Active User Active Member

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    Oh good idea I've got some grade eights I can probably use
     
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  5. scwhite

    scwhite United States Active Member Active Member

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    Get one big enough to drill a hole through it for the T- handle
     
  6. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    I have been using some key stock because it has a very good fit and nice square corners. It is standing up well but then I don't torque my chucks or D1-4 cams all that hard. The round corners and loose fit of the OEM chuck key were too sloppy for my liking.
     

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  7. scwhite

    scwhite United States Active Member Active Member

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    Yes yes should not be to hard to make
     
  8. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    Last edited: Apr 20, 2017
  9. scwhite

    scwhite United States Active Member Active Member

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    Yep I have used a 3/8 drive extension to
    Works good
     
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  10. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    I used to do the same on the cam locks for my lathe. But on my lathe the came locks are 10mm square & 3/8" extension is pretty loose. I now use a 10mm drain plug socket. I prefer to use a ratchet & extension over the stock chuck type key.
     
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  11. umahunter

    umahunter United States Active User Active Member

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    A ratchet fits my scroll chuck but the 4 jaw are a smaller square
     
  12. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    This is what happens to a cam lock if you use a poor fitting wrench
    IMG_0082.JPG
     
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  13. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    Ouch! That's what I was afraid of happeneing when I was using the 3/8" ratchet extension on my cam locks. I didn't imagine it could get that bad though. I'm glad I switched out to using the proper size 10mm square drain plug socket. Thanks for sharing!

    To clarify, I stated earlier that I didn't like using the stock chuck type key that came with my lathe for the cam locks. Nothing against using that type of key, I just didn't like the one that came with my lathe. I was too lazy to make a new better key & is why I use what I use but I like it.
     
  14. umahunter

    umahunter United States Active User Active Member

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    Ok is there a formula to figure out what size circle I need to come out with a square the right size I thought I mesured right but I came out way undersized once I milled down a square with square corners I must have mesure wrong some how ???
     
  15. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    Uma, I would look at the square as two right angled triangles joined along their hypotenuses.
    Measure the width of the socket and use 45 deg. trig functions to calculate the hypotenuse.

    If you measured the socket diagonally there is a chance of coming out too small when the inside corners are rounded.
     
    Last edited: Apr 21, 2017
  16. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    DZ, ever since I mangled a cam lock I have been using a better fitting softer wrench. Granted it may have been a defective cam lock (too soft) and lack of experience on my part but I feel better using a tool that should give before the cam lock does. Key stock seems to fit the bill perfectly.

    IMG_0168.JPG
     
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  17. bobshobby

    bobshobby Australia H-M Supporter - Premium Content H-M Supporter-Premium

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  18. Jonno_G

    Jonno_G Australia Iron Registered Member

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    Yes, there is.

    If you know your dimension across the flats (say 10mm for instance) then Pythagoras theorem (a^2 + b^2 = c^2) tells you that your diagonal will be 14.14mm, so you need to start with at least 15mm round stock to get a 10mm square.

    Cheers,... Jon.

    Sent from my Lenovo YT3-X50F using Tapatalk
     
  19. T Bredehoft

    T Bredehoft Active User H-M Supporter-Premium

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    The diagonal of a square is 1.414 times the side. The side of a square is .707 times the diagonal. These numbers have been in my head for over 30 years.
     
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  20. Tozguy

    Tozguy Active User H-M Supporter-Premium

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    I can't do that, my head is round.
     
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  21. RCWorks

    RCWorks United States 5 Star Possum Chef Active Member

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    I'd ask Tom Lipton at Ox Tool Co.
     
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  22. umahunter

    umahunter United States Active User Active Member

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    So I need to make a wrench with side that are .3125 and mesures on the diagonal .4200 but the corners aren't perfectly square so the diagonal might not be totally accurate
     
  23. umahunter

    umahunter United States Active User Active Member

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    Mm 7.98 sides and 10.48 diagonal
     
  24. Catcam

    Catcam Australia Steel Registered Member

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    Hi,
    to get the circle diameter you need to get a certain square machined out of it, simply divide the diameter by the square root of 2 (1.414) gives the perfect size, but if you don't mind a chamfer on the corners you can get a bigger square out of the round shaft.

    Alternatively instead of dividing by 1.414 multiply the diameter by its reciprocal, that is multiply by 0.7071 to give the same answer.
    works for any circle to give the included square.
     
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  25. bfd

    bfd United States H-M Supporter - Premium Content H-M Supporter-Premium

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    you don't want to have too sharp of corners on your key. the socket may not have good sharp corners and the key will not fit bill
     
  26. umahunter

    umahunter United States Active User Active Member

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    Well I got a chance to make a body had to stop and make a vise clamp to use got me to thinking should I use regular cold rolled for a handle or should that be hardened aswell 20170507_022854.jpg
     
  27. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    Handle doesn't need to be hardened, don't even need to harden the entire body either, just the square end will be perfectly fine.
     
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  28. umahunter

    umahunter United States Active User Active Member

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    20170511_140317.jpg 20170511_140310.jpg Finished I used a 5/8 grade eight bolt and some 5/16 for the handle drilled and tapped for 1/4 set screw I milled a lil flat on the handle and put some locktite to hopefully keep it from moving
     
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  29. kd4gij

    kd4gij United States Active User Active Member

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    I always use mild steel for lathe chuck keys. I would rather mess op the key than the socket.
     
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  30. scwhite

    scwhite United States Active Member Active Member

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    It looks good
     
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