The Shop > Tools
micro mill electricals problems, help please!!
drmico60:
--- Quote from: steampunkpete on December 17, 2014, 04:28:22 PM ---Would this controller from ebay do the job? The output would need to be routed through a reversing switch.
http://www.ebay.co.uk/itm/Rotary-Knob-Adjustable-Motor-Speed-Controller-AC-220V-Input-DC-180V-Output-/290933673054?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item43bcff8c5e
--- End quote ---
I think this would work although the description does not give any indication of the current or power rating. However, this type of controller is usually designed to cope with several amps so I think it would be worth the risk.
I doubt that the controller has ant provision for feedback to maintain constant speed regardless of the load but this may not be so important.
Mike
pmdevlin:
I really appreciate the help all, its very encouraging.
Following some suggestions (I posted on hmem then realised this was the UK site) I connected a 240v test light to the controller. Turned it on, holding my breath! the test light lit (60w bulb, very bright) I turned on the potentiometer, and the bulb light remained constant throughout the range. I was pleased thinking this means the most expensive item is ok, but is it? Should the bulb have lit with potentiometer turned off (meaning nil rpm for motor) or am I being stupid.
I then connected the motor to a 12v dc feed (don't know if its a dc or ac motor). The motor did not work, however I could feel "resistance" when turning the shaft by hand, which went if the motor was disconnected from the 12v feed. No hot wires suggesting a short. I stripped the motor again and inspected under an LED magnifying glass, I cant see anything wrong with windings etc.
Don't know if I have achieved anything doing these tests, any thoughts?? Thanks for the ebay link, I can breathe more easily now there is a potential fix at budget money : :mmr:
Again, many thanks, keep the suggestions rolling in, I need a cheap fix!
Paul
rleete:
I replied on the other forum, but I can repost here as well. All my problems with my micro mill were solved by replacing the speed control pot.
pmdevlin:
many thanks, sorry we are diving between the two forums.
By speed control pot, is it this (depending on which board I have)
http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/Super-X1-Spares scrolling down to the SX1-124 Potentiometer.
The control unit from ebay suggested previously, I have no real need for reverse, not use it in 18 months, so I would assume its an easy wiring up job? It has been suggested that 12v on the motor would not be sufficient to spin it up, and the fact the bulb was illuminated with pot turned off suggests its the control unit, as it should have gone brighter turning up the potentiometer?
So I was thinking, if the pot is faulty, should the motor not just run at a constant speed, or not at all? back to the beginning, it runs for a second or two then pops the fuse.
Whilst on the subject of fuses, I anticipate I will be blowing many more before its fixed, and only have 1 left, can I use something like this
http://www.ebay.co.uk/itm/ABB-S201-1-POLE-MCB-CIRCUIT-BREAKERS-2-4-6-10-16-20-25-32-40-AMP-/321302757144?pt=UK_BOI_CircuitBreakers_RL&var=&hash=item4acf22ff18
Thanks
Paul
I need to find someone with electronics experience!
pmdevlin:
well I have found a local electronics engineer, and have dropped off the motor and control unit for testing. I'm back in work tomorrow so this threads might go a bit quiet for a bit
Paul
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