Compound Indexing on Rotary table 90 tooth worm for 127 divisions

Discussion in 'The Break Room' started by SmithDoor, Mar 9, 2015.

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  1. Mar 9, 2015 #1

    SmithDoor

    SmithDoor

    SmithDoor

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    Has any ever did compound indexing on Rotary table 90 tooth worm or 72 tooth worm . I am working a chart for 20, 60, 72, and 90 tooth worm here the first one.
    127 division 6 32/41 + 15/49 10 times around for a 90 tooth worm
    127 division 2 23/39 + 12/49 12 times around for 72 tooth worm

    Dave
     
  2. Mar 9, 2015 #2

    Mechanicboy

    Mechanicboy

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    It is not difficult to create the 127 divisions with simple methods: Create the pointer and disc. Then create 127 division in exact dimension with Turbocad or Autocad. Clue the printed paper exactly on the disc. Fasten to the indexinghead/indexing table and the work is ready. 90/127 for 90 tooth worm, 72/127 for 72 tooth worm, 40/127 for 40 tooth worm. :)

    I has created the 127 gearwheel for Sieg C6 lathe without trouble. :)

    IMG_1376.jpg

    IMG_1374.jpg

    IMG_1375.jpg
     
  3. Mar 11, 2015 #3

    SmithDoor

    SmithDoor

    SmithDoor

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    Looks good
    I am working on charts for 20, 60, 72 and 90 tooth worm gear for indexing from 25 to 250 divisions.
    Use standard indexing plates

    Dave


     
  4. Nov 3, 2019 #4

    Shehan Perera

    Shehan Perera

    Shehan Perera

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    Why don't you try this.
    6 holes in a 19 hole cricle.
    It will divide 127 divisions
     
  5. Nov 3, 2019 #5

    Mechanicboy

    Mechanicboy

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    Not possible to index with 6 holes in 19 holes circle to creade 127 division, you need compound indexing or as i showed in early comments about printet paper as indexing..
     
  6. Nov 3, 2019 #6

    SmithDoor

    SmithDoor

    SmithDoor

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    127 is a prime number.
    If cutting metric threads use 37 and 47 tooth gear inlue of 127 and 100. This can be cut on BS-0 dividing head.
    Some manufacturer will use other gear sets.

    Dave

     
  7. Nov 5, 2019 #7

    SteveM

    SteveM

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    There is a beautifully simple and free website called Blocklayer that makes it a doddle to print a divided circle in addition to many other useful functions, like for example a pulley calculator. It literally takes about 10 seconds to specify a circle with 127 divisions like this:


    The image can be printed and it's a viable alternative for those of us without CAD.
    This should be a link to the website:
    https://www.blocklayer.com/circle-divider.aspx
     

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