Indexing on a 80mm3" rotary table

SmithDoor · Jan 4, 2025

If every need to index on a mini rotary table 3"

I am putting a indexing on new table.
Next part it is a 36 tooth worm index chart/table.

Any ever do this small ?

Dave

SmithDoor · Jan 4, 2025

Here a EXCEL for indexing Chart.
Had to zip

Dave

mole42 · Jan 4, 2025

I’ve used one, a lovely little tool.

Schatten · Jan 4, 2025

Unfortunately, it cannot be opened.

SmithDoor · Jan 4, 2025

Schatten said:
Unfortunately, it cannot be opened.

I check it out today

RM-MN · Jan 4, 2025

That file downloaded as soon as I clicked on it and went into my download folder. Opening it with Libre Office it looks good.

SmithDoor · Jan 4, 2025

Schatten said:
Unfortunately, it cannot be opened.

Try this one it old format
Last night I had to put zip files as would let upload the new format FYI I do not like the new but what is on my phone.

I also found a app on google today it is call Dividing head calculator.

Dave

SmithDoor · Jan 4, 2025

mole42 said:
I’ve used one, a lovely little tool.

I have larger one too but it takes time to setup for one part and was just hand laying.
Today getting everything smaller. I hit the 70 mark last year and making changes on size

Dave

SmithDoor · Jan 4, 2025

Schatten said:
Unfortunately, it cannot be opened.

Works on my phone .
It would not let me do OpenOffice unless zip it first

Dave

Note I left on Calculation data on sheet so see how done but in gray in dark gray print

SmithDoor · Jan 4, 2025

It still like BS 00
Making 59, 127 and 157 still a Dividing just for that gear.

FYI
59 tooth is for clock builders. Used for 29½ day moon cycle

127 metric threading you can use 37/47 works great too. Chinese way is very close too and great way to too.

157 tooth for worm gears. This only one no has ask me about.

If you rebuilding they always use odd numbers for gears. Compound indexing is great difference takes a long time to setup and takes time test.
There is a third way too not in most books. You indexing head then move the indexing pin one hole to for odd gear. I ran across this for clock makers for moon phase. This accuracy is less than 0.000510 off by one tooth. The guy did for a three other too . This was before the hand held calculator so all paper.

Maybe some here put more light on this way of indexing

As I remember some like this.
It is simple make 3 indexs and then backup one hole.

Dave

Schatten · Jan 4, 2025

SmithDoor said:
Works on my phone .
It would not let me do OpenOffice unless zip it first

Dave

Note I left on Calculation data on sheet so see how done but in gray in dark gray print

View attachment 163223

Schatten · Jan 4, 2025

Thank you, it worked. The mistake was mine.

SmithDoor · Jan 4, 2025

Schatten said:
Thank you, it worked. The mistake was mine.

It is handy to have. It is hard find charts on a lot of rotary tables.

When start with gears I found a lot od odd teeth gears like 51, 53, 63, 77 just every space a Dividing head did not have. It very simple manufacturer whan to sell parts.

I think back then a set odd numbers Dividing plates would a great seller.

Today on Ebay I seen odd numbers like 127 Dividing plates.

Dave

SmithDoor · Jan 4, 2025

Here youtube video on compound indexing.
The video show pin on top from time to time it get in way. The video a welding rod will .
It is in the Machinist Book last look in 1980’s

Best set of books

This what I like the pin is on the bottom

I have full chart on this one and should download here too. Around 2015

https://www.bing.com/videos/search?...FA2E4CB2BB59E&view=detail&FORM=VIRE&PC=EMMX01

Dave

SmithDoor · Jan 4, 2025

If look at chart from machinist hand book. Steps for 51 tooth gear.
1) 8 turns 41 on 47 index plate. .
2) backup 12 holes on a 49 index plate.

By Time you finished you 11 rounds no fun. Very accurate too

Dave

SmithDoor · Jan 6, 2025

. .
UPDATED ON INDEXING

I am using a disk on set collar.
Keeping the indext low to avoid using a sector. (few parts to builded)

Here charts a full and short for almost all work for both color and black & white printers all in PDF Files.

Dave

Vasily_A · Jan 6, 2025

My use case for an 80mm index table: Made a few years ago, used as the 4th axis of a small homemade CNC router.

SmithDoor · Jan 6, 2025

Vasily_A said:
My use case for an 80mm index table: Made a few years ago, used as the 4th axis of a small homemade CNC router.

Looks great

One easy way is use an electronic counter used in food and oil production.
I used back in 1980s in cutting steel sheets to length off coils of steel.
I know saw this in 1960s

Today you can buy a gear motor with the encoder all one. Then buy an electronic counter with scaling.
FYI The scaling you make the display read in degrees.

The programing just takes fun out.

Dave

Vasily_A · Jan 7, 2025

For me, working with metal is a hobby, and programming and electronics are what I do for a living

In any case, I use the 4th axis on a machine controlled by linuxCNC, and even work without a program (pressing buttons instead of rotating the lead screws using handles) is done by looking at the screen with coordinates, this is more convenient for me.

SmithDoor · Jan 7, 2025

Vasily_A said:
For me, working with metal is a hobby, and programming and electronics are what I do for a living
In any case, I use the 4th axis on a machine controlled by linuxCNC, and even work without a program (pressing buttons instead of rotating the lead screws using handles) is done by looking at the screen with coordinates, this is more convenient for me.

You see on my Avarar what did for living. No programing just use the drum switch.

Dave

Indexing on a 80mm3" rotary table

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