Universal dividing head with absolute encoder

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01 Nov 2019 18:05 - 01 Nov 2019 18:06 #149380 by Leon82

1 to 1 timing pulleys will also.give same results is not it?


I think because of the reduction you may have error before the encoder sees the next pulse, as it is not hooked to the motor.

You would have to overdrive the encoder to equal motor shaft revolutions
Last edit: 01 Nov 2019 18:06 by Leon82.

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02 Nov 2019 08:43 - 02 Nov 2019 08:43 #149410 by rodw
Its not Linuxcnc but Arduino and its only a stepper but I wrote the Arduino script for the indexer shown here. Scott used a prox sensor in place of the indexing button so he could wave a tool past the proximity sensor to index it. A better way would be to trigger a relay with an M code on some CNC controllers.



Un like a lot of others, this uses interrupt driven code and ramps acceleration up and down much like the way Linuxcnc does it.

I could find the script if you were interested.
Last edit: 02 Nov 2019 08:43 by rodw.

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02 Nov 2019 12:56 #149424 by Leon82
Have you purchased the gearbox already?

There are harmonic drives reducers too with high reduction ratios too and very low backlash.

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02 Nov 2019 13:29 #149425 by andypugh

Have you purchased the gearbox already?
There are harmonic drives reducers too with high reduction ratios too and very low backlash.


And some with a built-in servo and cross-roller bearings too.

The FHA-25 is basically a ready-to-go rotary axis.

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02 Nov 2019 14:50 #149426 by Dinuka_Shehan
I have got universal dividing head

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02 Nov 2019 15:48 #149428 by andypugh

I have got universal dividing head


One of these?
photos.app.goo.gl/Viqqgy7bB1yqDBuc9

If so, before you do any conversion work in it, make sure that the worm engagement can be adjusted for very small backlash in the loosest spot whilst still being smooth and free in the tightest spot.
Mine was too inconsistent in that regard.

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02 Nov 2019 23:17 #149456 by rodw

I have got universal dividing head


I personally don't think there is any benefit in the dealing with the backlash for a dividing head on a manual machine because you are not going to be using it for milling operations. For indexing, you just need to make sure that you only go in one direction which is the way we've used manual machines since they were invented. Then backlash does not exist.

It quite simple to mount a motor to one. Using mounting posts like this makes it very easy to align the motor.



you can do circular milling operations but on my 90:1 table the rpm maxes out at about 4 RPM so maybe a 40:1 is good for say 8-10 rpm


This is a mount for a spindle light for my Seig SX3 mill

The LED ring is for a headlight which we bought off eBay.
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03 Nov 2019 03:45 #149466 by Dinuka_Shehan
I have dividing head like that which was made in England
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01 Sep 2020 10:39 #180299 by kris321
Replied by kris321 on topic Universal dividing head with absolute encoder
you can do a Hybrid stepper and connect the system ?

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01 Sep 2020 10:50 #180305 by rodw
Yes you can.

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