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Thread: Lathe Indexing Fixture

  1. #1
    LMMasterMariner's Avatar
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    Lathe Indexing Fixture

    Hi guys,

    This is just addition to lathe chuck brake, but both combined make perfect tool.



    Consists of the following parts:

    - Lathe Chuck Brake (already described)
    - Indexing disc
    - Bar
    - Indexing pin
    - Locking piece

    Indexing Disc
    =============

    It is actually brake / indexing disc as it has 2 purposes.
    Making of that disc is described in my post 'Lathe Chuck Brake' and drilling
    of the holes on it was done as follows:

    1. Brake / Indexing disc was mounted onto lathe chuck with three 8mm bolts.

    2. 5" four jaws scroll chuck was mounted onto 6" rotary table. TIR 1/100 mm.

    3. Both chucks were connected with perfectly straight 22 mm s.steel round bar.
    TIR at lathe chuck = 2/100 mm, which is almost negligible for this project.

    4. First I drilled inner circle of holes (24 holes) with 15/64" drill and afterwards milled
    holes with 1/4" end mill. Then outer circle of holes (30 holes) was done the same way.

    With these 2 rows of holes I have the following divisions: 2, 3, 4, 5, 6, 8, 10, 12, 15, 24 and 30.


    Bar
    ===

    Made from 30 x 5mm stainless steel flat bar; two bars connected at 90 deg angle.
    Guider for indexing pin made from 15 mm s.s. round bar, drilled with 1/4",
    one end threaded with M12 thread and screwed onto flat bar.


    Indexing pin
    ============
    Made from S.S. 8mm round bar. Partly turned to 6.35 mm


    Locking Piece
    =============
    Made from steel 10mm bolt. Head of the bolt was milled in order to fit behind the brake block.


    And the most important for the end:
    Chuck brake keeps chuck fully locked in desired position.

    Regards
    LMMasterMariner
    Attached Thumbnails Attached Thumbnails Lathe Indexing Fixture-01.jpg   Lathe Indexing Fixture-02.jpg   Lathe Indexing Fixture-03.jpg   Lathe Indexing Fixture-04.jpg   Lathe Indexing Fixture-05.jpg  

    Lathe Indexing Fixture-06.jpg   Lathe Indexing Fixture-07.jpg   Lathe Indexing Fixture-08.jpg  

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    Paul Jones (06-14-2017), rendoman (06-14-2017), Ron 2 (06-15-2017), rossbotics (06-14-2017), Seedtick (06-13-2017), Toolmaker51 (06-13-2017)

  3. #2
    Content Editor DIYer's Avatar
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    Thanks LMMasterMariner! We've added your Lathe Indexing Fixture to our Measuring and Marking category,
    as well as to your builder page: LMMasterMariner's Homemade Tools. Your receipt:




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    LMMasterMariner (06-13-2017)

  5. #3
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    I liked the brake but now this has really got my interest,

    "With these 2 rows of holes I have the following divisions: 2, 3, 4, 5, 6, 8, 10, 12, 15, 24 and 30."

    Boy do I have a lot of catching up on my math, luckily I have a rotary indexer but I still can picture needing more division as I imagine I will eventually want to
    make some gears.

    Thanks for posting, more distractions to be thinking about.

    Ralph

  6. #4
    Frank S's Avatar
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    That spindle brake is fast becoming as handy as pockets on a shirt
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

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    LMMasterMariner (06-14-2017), Paul Jones (06-14-2017)

  8. #5
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    I have some brake disk from a Nissan and a 12x36 Craftsman lathe I wonder if maybe I could...

    Damm, the poor lathe has been sitting outside my shop for the past six months and is likely to set there for another year if I do not stop letting myself
    get distracted with these projects that keep popping up.

    But at least this one I would have to get the area in the shop finished so I could bring the lathe in to do the work on it.

    I really like the indexer function, I am just starting working with a lathe so I do not know about the brake but I can see where that might be a benefit.

    Ralph

  9. #6
    Frank S's Avatar
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    Ralph if you noticed in the video the brake also served to further secure spindle by removing any possibility of movement in the indexing arm
    I can foresee gear cutting on this lathe with the addition of a mill and since the brake is controllable in the amount of applied braking force, with the proper fixtures even helical gears
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  10. #7
    LMMasterMariner's Avatar
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    Ralph,
    I have 6" rotary table on my milling machine for cutting gears. Also have 2 sets of involute gear cutters modules M1 and M1.5. Half of the sets actually, from #5 to #8, so I can cut from 26 teeth to rack. Also purchased R8 arbor for these cutters. Indexing fixture on my lathe will be used mainly for rifling grooves inside barrels once I complete my lathe/rifling machine project, which is postponed for some better times.
    Regards
    LMMasterMariner


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