Compound Indexing on Rotary table 90 tooth worm for 127 divisions

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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
 

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
 

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


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. :)
 

Mechanicboy

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Why don't you try this.
6 holes in a 19 hole cricle.
It will divide 127 divisions
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..
 

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

Why don't you try this.
6 holes in a 19 hole cricle.
It will divide 127 divisions
 

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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