Random stuff, reduction, servo motors, ideas and thoughts

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27 Mar 2020 19:35 #161737 by tommylight
Starting a new topic as we keep hijacking other threads.
Use this as random everything, so to start here are some pictures of 4 servo motors i bought used for 120 Euros a while back, they seem to be 1.5KW, 4000RPM, 3.7MN and 25.8MN peak, they have tachos but no encoders and there is no easy way to mount them.

Spec:

Tacho:

I have another 4 much bigger from the same machine/manufacturer on hold at 50$ a piece that i will collect after this "V mess", they should be at least 2.5KW or more, they are to damn heavy.
Today i did some experimental work on a reduction for smaller machines with belt drive, using some aluminium profiles, and there is no way on earth i can explain how it is done so here are pictures instead of me yapping to no end:

Front:

And from above so you can see what is going on inside:

Thoughts, ideas, critique ? Free velocity servo drives ??? :)
Attachments:
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28 Mar 2020 07:43 #161787 by bbsr_5a
isent this a standard 42 mount
and the tachos are hooked up
take the backcase off and mount cheep 20USD 2000ppr Hole/Shaft encoders and you got a real good system
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28 Mar 2020 14:01 #161806 by tommylight
They are 98mm frame, so not exactly nema42, and i did open them but there is no way to mount anything on them.
I do have 5x of 2500ppr encoders with 8mm shafts that will need mounts and axle made to be mounted beside the motor and driven by the belt. Not the best solution, but it works.
Thank you.

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28 Mar 2020 15:03 #161818 by PCW
Another option is to mount the encoder on the far end of the ballscrew
Though this adds to wiring complexity
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28 Mar 2020 23:29 #161864 by andypugh
Use the servos in velocity mode with linear scales for position feedback.
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28 Mar 2020 23:39 #161871 by tommylight

tommylight wrote: Thoughts, ideas, critique ? Free velocity servo drives ??? :)

I would, but i have none! Like no servo drives and no linear encoders.
I do have 2 of the Gecko 320 servo drives collecting dust somewhere in the shop, but i do not like them much.

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05 Apr 2020 02:47 #162740 by thefabricator03
I am a little late to the party Tom.

Where do you come across all your motors?

In the other plasma thread with the round frame steppers you posted. How old are those motors?

I am in a rural city in Australia so its hard for me to come across these kinds of things without driving 500km north,south or east. Not many old factories out here.

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05 Apr 2020 22:34 #162808 by tommylight
Yeah old factories, we had plenty of them before that war, now they all got sold for scrap and shopping centres opened in their place. Miserable!!!
I tend to buy big old xerox photocopiers and dismantle them, they always have Japanese motors, the big ones are usually from the machines mentioned in the above factories that got to the scrap yard.
Of the over 20 big factories ( my father worked for Zastava, car manufacturing, very crappy cars, for over 30 years, it had 2200 workers ), the only one still working is the beer factory.
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06 Apr 2020 00:01 #162827 by thefabricator03
Seems to be a sign of the times with factories shutting down. Although maybe that might change after the world gets over the virus. If it has done one thing well, it has shown how fragile the worlds product supply chains have become.

Funny how putting all your eggs into one basket can cause havoc.
I for one would like to see the return of local manufacturing. Its going to be interesting to see the aftermath of all this.
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06 Apr 2020 10:15 #162879 by tommylight

thefabricator03 wrote: Seems to be a sign of the times with factories shutting down. Although maybe that might change after the world gets over the virus. If it has done one thing well, it has shown how fragile the worlds product supply chains have become.

Funny how putting all your eggs into one basket can cause havoc.
I for one would like to see the return of local manufacturing. Its going to be interesting to see the aftermath of all this.

Agreed!
I am refraining from going off the handle again about how humanity got messed up with the bloody phones to the point that humanity does not exist any more, we still look like humans, but there is not much humanity left in us. Maybe this teaches us how to be humans again.
BTW, i use my phone for calls and e-mails, nothing more, except some drawings and writings i do from time to time on a Note 8.
No anti-social networking, i still like to socialise with humans, not phones.
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