Retrofitting a 1986 Maho MH400E

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8 years 1 week ago #119239 by drimaropoylos
Replied by drimaropoylos on topic Retrofitting a 1986 Maho MH400E
Hello, thank you for the info, so in newer models the shaft for the encoder is like this?

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8 years 1 week ago #119240 by drimaropoylos
Replied by drimaropoylos on topic Retrofitting a 1986 Maho MH400E
I also was thinking to put a hallow encoder directly in the shaft, but I am afraid the oil mist will find its way insight the encoder.

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8 years 1 week ago #119241 by RotarySMP
Replied by RotarySMP on topic Retrofitting a 1986 Maho MH400E
Hi John,

That encoder looks like a great solution (for my lathe project :)), at least for shafts which are not within an oil bath, Strange they used -Z bearing shields instead of -2RS seals.

Where did you source it from?
Mark

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8 years 1 week ago #119242 by drimaropoylos
Replied by drimaropoylos on topic Retrofitting a 1986 Maho MH400E
They are very common encoder in elevators, so they are relative cheap.
www.aliexpress.com/item/Good-quality-GHH...5e-acf2-3d73ec1c44a1
.They can even customize the bore.

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8 years 1 week ago #119249 by RotarySMP
Replied by RotarySMP on topic Retrofitting a 1986 Maho MH400E
Thanks for the link. I should have guessed.

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8 years 6 days ago #119382 by RotarySMP
Replied by RotarySMP on topic Retrofitting a 1986 Maho MH400E
Yesterday I pulled finger and did a little more wiring. This is the connector for the two encoders which do feed override and rapid select.

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The Heidenhain 602D EXE I ordered arrived, so hopefully I can wire that up and get three axis motion at last.
Mark

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8 years 5 days ago #119412 by RotarySMP
Replied by RotarySMP on topic Retrofitting a 1986 Maho MH400E
I got the EXE 602D wired up to the Z axis encoder. It is working fine with the output scale correct. I am having some trouble with the PID tuning, but will sleep on it.
Mark

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8 years 4 days ago #119478 by RotarySMP
Replied by RotarySMP on topic Retrofitting a 1986 Maho MH400E
Dumb question, but how do I reverse a servo axis? Z is moving reversed. Going up when it should go down.

Running this slow (0.2 output scale) moves smoothly and moves the correct distance, up to 1mm when commanded, but the following error is moving out to 1mm, and then slowly returns once the axis stops.

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Mark

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8 years 4 days ago #119479 by andypugh
Replied by andypugh on topic Retrofitting a 1986 Maho MH400E

RotarySMP wrote: Dumb question, but how do I reverse a servo axis? Z is moving reversed.


Change the sign on the encoder scale so that the counter counts in the right direction, and then _also_ swap the sign of the PWM (or analog) output scaling.

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8 years 4 days ago #119481 by RotarySMP
Replied by RotarySMP on topic Retrofitting a 1986 Maho MH400E
Thanks Andy, that makes the motion sense correct, but I still have the following error = distance moved. The encoder is working and the 1mm move stops after exactly 1mm,

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