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Thread: Indexing for Myford lathes

  1. #1
    Bony's Avatar
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    Bony's Tools

    Indexing for Myford lathes

    My smallest lathe is a Myford Super 7, purchased new over 40 years ago. It's extremely well made, very versatile and still in perfect working condition. I now use it only occasionally for small jobs and to utilise (no z in Au) the very handy T slots machined across the saddle to hold various accessories, eg. for turning spherical shapes.

    Attachment 25152


    Indexing for Myford lathes-m2.jpg
    A closer view.

    Indexing for Myford lathes-m3.jpg
    With chuck removed showing the locking (screw in) pin, made from an old plumbing tap, with the shaft turned down to fit snugly into the slots on the plate attached to the back of the chuck. This fitting screws into an existing otherwise unused tapped hole, very handy as no modification to the lathe is needed.

    Indexing for Myford lathes-m5.jpg
    Chuck removed showing indented plate on the back.

    Indexing for Myford lathes-m6.jpg
    Rear view on the chuck with plate attached. there are 3 bolts holes on the chuck which I have used for 3 countersink screws, 1/4 inch Whitworth I think they are, to hold the plate in position.

    Indexing for Myford lathes-m7.jpg
    This is the plate with 24 slots machined into it, plus a recess to reduce the width of the protrusion at the rear of the chuck to gain sufficient clearance. I think I used a gear cutter to mill the slots, it was some time ago now. Any form of slot would do so long as the shape of the pin to mate with it screws in place with no movement whatsoever.

    Indexing for Myford lathes-m8.jpg
    The other parts.

    This form of indexing is extremely rigid and is suitable for any milling operation on the lathe. The indents are number stamped, a bit pointless really. The best idea is to colour code them (yes we add a "u" in Au, as the Brits do) using nail varnish (as shown on my other indexing post about a week or so ago). Dab a drop of say yellow nail polish on every 4th slot to use for 6 divisions, red for every 6th indent for 4 divisions, blue for each 8th slot for 3 divisions etc. 24 slots will provide a handy combination of 2, 3, 4, 6, 12 and 24 divisions. if you want 5 and 10 or any other combination simply make another plate.

    A very handy indexing method which requires no mods to your lathe and is rock solid in use.

    Hope you find this as useful as I do.

    Bony
    Attached Thumbnails Attached Thumbnails Indexing for Myford lathes-m1.jpg  

  2. The Following 11 Users Say Thank You to Bony For This Useful Post:

    allenz (08-21-2018), Bushtracker (08-20-2018), Frank S (08-21-2018), high-side (12-13-2018), Jon (08-23-2018), LMMasterMariner (08-21-2018), Paul Jones (08-21-2018), PJs (08-20-2018), rossbotics (08-20-2018), Seedtick (08-20-2018), Toolmaker51 (12-12-2018)

  3. #2

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    Thatís a great post. Would your idea work on a Southbend Nordic 15? I would love to have this as an option for my lathe. Thanks

    Michael Sutton

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    What is the name of the other post you spoke of? Iíd like to see it

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    Thanks Bony! We've added your Lathe Indexing Setup to our Lathe Accessories category,
    as well as to your builder page: Bony's Homemade Tools. Your receipt:




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    wizard69's Tools
    Had a bit of a laugh here thinking you guys down under varnish your nails before driving them into the wood.

    In any event a great little improvement for your lathe!!! I might ask, did you cut the index slots with a gear tooth form cutter? They just have the appearance of being cut with a rack tooth cutter.

  7. #6
    Bony's Avatar
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    Bony's Tools
    I think I used a gear cutter, don't remember now as I made this about 30 years ago. And it's still very useful indeed.

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    I really like this, converting rotation to indexed spindle degrees would benefit user with milling attachment. Bet milling isn't only possibility. Inspecting bolt circles, multi-start threads, layout keyways, simple cams...Wonder if a lineal ramp [like taper attachment] and cutter arrangement could trace an oil groove helix. Indexing parts for each pass is needed.
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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    Bony's Avatar
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    ??? Never heard that before, why so they don't fall out?

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    Quote Originally Posted by Bony View Post
    ??? Never heard that before, why so they don't fall out?
    Hmmm? what doesn't fall out?
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

  11. #10
    Bony's Avatar
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    Just responding to Wizard69's comment below about Aussies from down under.


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