The Shop > Tools
Real Bull Mini-lathe Speed Controller Woes
Ross:
Sorry John I had the DVM set wrong it read 11.7 volts so nothing wrong there
John Rudd:
:worthless:
--- Quote from: Ross on September 08, 2015, 01:46:11 PM ---Sorry John I had the DVM set wrong it read 11.7 volts so nothing wrong there
--- End quote ---
Ok, thats good...so now you need to test the pot as I described...
If that checks out ok, you need to recheck your wiring to/from the board...the test with a 240 domestic light bulb connected in place of the motor...the bulb should vary in brightness as you rotate the speed pot....you could measure the voltage across the bulb too...,it should vary between 0 and around 170-180 volts DC.....
Ross:
--- Quote from: John Rudd on September 08, 2015, 11:51:10 AM ---
You can check the speed pot with your meter of the ohms range ( set to 20k ) connect one lead to the centre tag and the other lead to one of the outer tags,turn the spindle and watch the meter reading....should go from zero to either 5k or 10 k depending on the value of the pot, I forget it at the moment -:(
--- End quote ---
Measured the resistance of the Pot. One lead to centre has a reading and one lead has no reading whatsoever.
John Rudd:
Ok, worth changing the pot then.... :zap:
Is there anything special about this pot? Has it got a switch on the back? If it hasnt and the value is 4.7k let me have your address and Ill post you one .......
Or else you might be worth getting in touch with Amadeal...Speak to Hugh...very helpful..
Keep us posted...,
Ross:
GOOD NEWS
Ordered a Pot from Amadeal, as per your suggestion John, Re tested once installed and got a reading on both points instead of just the one. Plugged in the lathe and she runs as sweet as a nut!
Thanks all for your help we are up and running again :mmr:
The only thing is that LED readout for the spindle display is intermittent I think it must be the unit as I have replaced the sensor and board for it.
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