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| Mini Lathe Electrikery....... |
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| lordedmond:
time to get a new motor then A point before you spend :( :( :( :( dis the motor from the control board and replace it with a 100 watt lamp BC or GS your choice make sure its a 220 volt one not 110 one( we used to have at Stanton Iron works 25 v, 50 v, 110 v and 240 volt lamps all in normal BC :doh:) then try to power up you should be able to see the result of the speed pot in how bright the lamp is , if it goes full on or not on you need a new pcb ark euro do do spare ones , but beware duff motor could release the magic smoke for a new board and visa versa may be useful http://www.repaircontrol.com/FinalTest/FCSeriesPreInstallation.pdf http://www.repaircontrol.com Stuart |
| Stilldrillin:
Dave. Is this what yer after? Commutator looks a bit grotty. Seeing as it's only done 2 seconds work....... :scratch: Hmmm...... Stuart. I think this is where I hand over to a Higher Authority...... :thumbup: David D |
| Bluechip:
Hi Dave Seen worse comms .... Any type numbers on the components screwed on th LH side ?? 5 of them, metal tabs capscrewed onto the heatsink ?? Will be on the black bit under the screws ( M3 ??? ) Looks a bit like mine, not sure ?? Dave BC |
| lordedmond:
David D no problems it take a real man to call for higher help good luck with it Dave BC If all else fails this may help http://www.amadeal.co.uk/acatalog/KB_Mini_Lathe_Speed_Controller_Circuit_Board.html http://www.littlemachineshop.com/Reference/DriveTroubleshooting.pdf |
| John Swift:
Hi Dave SD , the pictures are interesting your lathe looks like this one :--- http://www.cnczone.com/forums/mini_lathe/125585-wiring_parts.html the motor does not look too bad , as Dave BC said one way to test it is to apply a low voltage AC across the commutator (with the armature out of the motor ) then measure the voltage between adjacent segments ,it should be all the same a shorted turn or an open circuit will result a marked difference If the problem is the control board first check the 3 diodes and 2 thyristors (scr's) on the heatsink are not short circuit and then 275V varistor MOV1 and the capacitor across it C20? , they are both directly across the mains supply John |
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