New to STM32 and projects on it

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davemorl
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Re: New to STM32 and projects on it

Post by davemorl » Thu Sep 07, 2017 12:47 pm

Thanks!

No harm in having a play and see how it goes for a couple of quid.

I was thinking off adding a couple of hall sensors in parallel as a bit of protection for the end limits as a bit of a safety measure. I think this will be advisable with almost 25,000Nm of calculated torque.

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ahull
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Re: New to STM32 and projects on it

Post by ahull » Thu Sep 07, 2017 2:18 pm

davemorl wrote:
Thu Sep 07, 2017 12:47 pm
I think this will be advisable with almost 25,000Nm of calculated torque.
:o You certainly don't want that much oomph pinging lumps of metal round the workshop.
- Andy Hull -

zmemw16
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Re: New to STM32 and projects on it

Post by zmemw16 » Thu Sep 07, 2017 3:47 pm

could you post a sketch of what you have in mind for the mechanics ?

you say torque, so it's acting on an arm of some sort. pushing or pulling something (constrained in a guide?) against the pipe ?

stephen

davemorl
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Re: New to STM32 and projects on it

Post by davemorl » Thu Sep 07, 2017 4:12 pm

I'm currently on an oil rig in the north sea, i'll try and upload a screenshot of the CAD drawing later, I may even have a pic of the progress on my phone if you are interested. Its basically a 4 step spur gear reduction with another worn wheel gearbox between that and the motor.

Apologies I had a big brain fart its not 25,000Nm its actually around 5,000Nm god knows where that figure came from its been a long day :o

davemorl
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Re: New to STM32 and projects on it

Post by davemorl » Thu Sep 07, 2017 6:13 pm

Here is what I have on my phone! It's a bit further on than this though!
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davemorl
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Re: New to STM32 and projects on it

Post by davemorl » Thu Sep 07, 2017 6:16 pm

This is the cad drawing I've mate! There will be a few things different. Especially on the adjustable follower.
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zmemw16
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Re: New to STM32 and projects on it

Post by zmemw16 » Thu Sep 07, 2017 6:28 pm

oh, i tend to restrict myself to 10, 15 & 22mm and in plastic :)
also say you meant worm and not worn ? backlash is not a big enough term for that lot.
and up to what size tube ? actually anything from the look of that setup :!:
so the motor came off a 3d printer ?

stephen

davemorl
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Re: New to STM32 and projects on it

Post by davemorl » Thu Sep 07, 2017 6:47 pm

Yeah worm, bloody predictive haha!

Yeah I'm not to worried about backlash as I'll be taking up the slack in the system and then zeroing then bending to the desired bend with the addition of the spring back which will be determined from a few tests.

I've got the die made for 60x30mm oval tube with 3mm wall thickness so that's the first test. I'll just make new dies as I need them which won't be to hard.

I'm putting a 1kw 3phase 4pole motor on it so will be pretty beefy! I'm hoping that the motor will stall before anything snaps especially the gears. I've calculated it this way so hopefully I have done it right 😂

So I'm hoping to get the hang of the stm32 and get this up and running asap. In the mean time I'll just try it manually with fwd and back buttons.

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