Where to find ca. 24 RPM?

- M
- Mike Spencer
  
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posted
1 year ago

Wed, Jan 20, 2021 5:36 AM

I need a couple of shafts that turn about 24 RPM. I have a variety of
gear motors but they're either tiny or the wrong type to be slowed
with a variac.
What production device might I be able to salvage either ca. 24 RPM
gear motors or smallish speed-controlable motors from?
No machine shop gear so making a gearbox from scratch isn't on.
Target is a mechanical candy puller to handle smaller-then-commercial
batches of pulled candy so service is continuous but very modest
torque.
Now I have to go clean up the mess left by verifying that all the
motors I have are unsuitable. Grumble.

- C
- Carl
  
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posted
1 year ago

Wed, Jan 20, 2021 5:54 AM

Not quite what you asked, but my favorite surplus purveyer is Marlin P. Jones, they have a 12VDV 25 rpm gear motor for $13:

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- J
- Jim Wilkins
  
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posted
1 year ago

Wed, Jan 20, 2021 12:33 PM

I need a couple of shafts that turn about 24 RPM. I have a variety of gear motors but they're either tiny or the wrong type to be slowed with a variac.
What production device might I be able to salvage either ca. 24 RPM gear motors or smallish speed-controlable motors from?
No machine shop gear so making a gearbox from scratch isn't on.
Target is a mechanical candy puller to handle smaller-then-commercial batches of pulled candy so service is continuous but very modest torque.
Now I have to go clean up the mess left by verifying that all the motors I have are unsuitable. Grumble.

- B
- Bob La Londe
  
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posted
1 year ago

Wed, Jan 20, 2021 2:41 PM

McMaster Carr has a number of gear motors for under $100.
This one looks like it might be close to what you are looking for:

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400 oz/in is more torque than a stepper on a small CNC hobby mill.
Surplus Center, American Scientific, and Ebay are also places to check for surplus and new alternatives. I can't speak to food safety on any of them.

- S
- Spehro Pefhany
  
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posted
1 year ago

Wed, Jan 20, 2021 5:37 PM

Maybe an old laser printer? Especially the giant ones that were built like tanks.
Maybe too wimpy for your application, but there are a bunch of DC right-angle gear motors from China for tens of dollars up to maybe $80 or so, and they can supply an open-board speed controller for a bit more. Quality seems quite good (metal worm gear train). There are also some reducers that could be coupled to a brushless motor or stepper if you need really long life.

Best regards, Spehro Pefhany

- J
- Jim Wilkins
  
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posted
1 year ago

Wed, Jan 20, 2021 7:11 PM

What production device might I be able to salvage either ca. 24 RPM gear motors or smallish speed-controlable motors from?
----------------------------- Not for this perhaps, but garage door openers. The adjustable overload sensor may be useful too.