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Old 17th Nov 2018, 11:44 am   #16
squegging
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Join Date: Mar 2011
Location: Bristol, UK.
Posts: 44
Default Re: DC motor speed control

Quote:
Originally Posted by Ed_Dinning View Post
Is this motor directly coupled to the wheel, or through a belt/ gearbox system?
If that is the case and you do not need the max speed, alter the drive ratio.
Ed,
There is belt dive reduction using two "fan belts". Smaller pulleys x2 64mm running dia, larger ones x2 241mm running dia. So I reckon overall the ratio is 14.18:1. So plenty of torque on the turntable. Not so easy changing gear!

And thanks everyone else for your interest and suggestions. There are indeed two pots L & H which I haven't yet touched, but will give them a good twiddle to ensure their wipers are ok when I can get back to the job.

Last edited by squegging; 17th Nov 2018 at 11:50 am. Reason: correction
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