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Thread: rotary table worm shaft

  1. #1
    Supporting Member thehomeengineer's Avatar
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    Nov 2017
    Berkshire UK
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    thehomeengineer's Tools

    rotary table worm shaft

    Hi All
    Yesterday I spent the day making a new worm shaft for my rotary table. The reason for this, I am currently trying to make this motorised. controlled via an Arduino and stepper motor. As I need to find away of coupling the shaft of the rotary table to the stepper motor I didn't want to make modification to the existing shaft just in case I ever need to convert back to manual table.
    The last time I cut a worm was in my apprentice days so a bit of head scratching and research it all came flooding back.
    The first thing was to remove the existing shaft so I could get some measurements. As I could measure the pitch this was a good starting point and the table being made in Spain I was guessing it would be a Module gear? so to calculate the Mod=Pitch/Pi. So Mod=6,28/3.14= Mod 2,
    I then calculated the helix angle to ensure I had enough lead clearance when setting the tool and cutter to cut the HSS tool. The helix angle is simple trigonometry. First the opposite side is the pitch and the adjacent side = (Pi x Dia of shaft) which equates to one full thread.
    The shaft blank was machined and the lathe gear box/gear train set to the Mod 2 mode.
    rotary table worm shaft-gearbox-plate.jpg
    Gear selection chart

    rotary table worm shaft-mod-gear-train.jpg
    Mod gear train

    rotary table worm shaft-low-range-gear-train.jpg
    Standard low range gear train I normally use

    rotary table worm shaft-first-passes.jpg
    First few passes.

    rotary table worm shaft-retracting-tool.jpg
    Retracting tool makes the process a lot easier

    rotary table worm shaft-oilway-tab-slot.jpg
    Milling oilway and lock washer tab slot

    rotary table worm shaft-finished-worm.jpg
    Finished worm

    rotary table worm shaft-both-shafts.jpg
    Both shafts

    rotary table worm shaft-new-assembly.jpg
    Assembled new shaft assembly

    rotary table worm shaft-table-casting.jpg
    Rotary table casting

    Thank you for viewing
    The Home Engineer

  2. The Following 5 Users Say Thank You to thehomeengineer For This Useful Post:

    Altair (10-12-2019), Jon (10-12-2019), olderdan (10-12-2019), shopandmath1 (Yesterday), Toolmaker51 (Today)

  3. #2
    Content Editor Altair's Avatar
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    Aug 2013
    Thanked 1,638 Times in 507 Posts

    Thanks thehomeengineer! We've added your Rotary Table Worm Shaft to our Machining category,
    as well as to your builder page: thehomeengineer's Homemade Tools. Your receipt:

  4. #3

    Join Date
    Oct 2019
    Thanked 1 Time in 1 Post
    Good job this is not easy to do

  5. The Following User Says Thank You to shopandmath1 For This Useful Post:

    thehomeengineer (Today)

  6. #4
    Supporting Member Toolmaker51's Avatar
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    Feb 2016
    Midwest USA
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    Toolmaker51's Tools
    Probably my favorite tooling; powered rotary tables.
    I hunt periodically for a driven table suitable for my Kearney-Trecker 2D. It has the PTO. But powered independently DC and speed control offers different [infinite] feed options.

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