Andrew Evans | 24/05/2013 19:04:31 |
366 forum posts 8 photos | Hello - I am after a spindle speed control board to control the permanant magnet motor on my Denford Starturn 4 lathe. The Homann Digispeed board looks ideal but i can't see a UK supplier, shipping from Australia takes up to 4 weeks and they seem to be out of stock anyway. Can anyone recomend an alternative or a more local supplier? Cheers Andy |
Bazyle | 24/05/2013 22:14:29 |
![]() 6956 forum posts 229 photos | There have been a coupleof threads in the last few months about problems with lathe speed controls. Within those posts have been mentions of other suppliers of control boards so a bit of searching should yield the information. |
Andyf | 25/05/2013 00:07:53 |
392 forum posts | I'm not sure it's a speed control board itself that Andy wants, Bazyle. It looks to me that he is after a board to sit between that and his computer, to get the speed pot under computer control. I'm not into CNC, but I imagine that this involves inputting his desired speed, after which his software compares the blips from a tacho on the spindle with the desired rate of blips as generated by the software, and adjusts the speed pot until the two coincide, through something like a phase locked loop. (another) Andy |
John Stevenson | 25/05/2013 00:20:20 |
![]() 5068 forum posts 3 photos | Try here.
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Les Jones 1 | 25/05/2013 09:37:37 |
2292 forum posts 159 photos |
Hi Andy (E), Les. |
Andrew Evans | 25/05/2013 11:54:39 |
366 forum posts 8 photos | Thanks everyone - sorry I was a bit unclear. As Andyf says I need a board to sit between the existing (original) control board and the computer. The original control has a manual potentiometer that varies between 0 and 5V. There is a tacho on the spindle with a multi-slotted disc. I want to control the spindle from Mach3 - on/off, speed and do threading (give it a go anyway at a later stage after I have got everything else running ). The motor is 180V, 3.25A, 0.44 kW. Motor goes up to 5000rpm and the spindle up to about 2200 rpm driven by a toothed belt. John - I contacted Roy at DIY CNC and he said his board would work for me if the potentiometer went from 0 to 10V - I am not sure if that means it is suitable for me (mine is 0 to 5V) but have asked him. His site indicates that his board controls the speed via an inverter which isn't the setup i have. The Homman site does say that his boards are suitable for motors currently controlled by a potentiometer and another person (David Murray on the Denford forums) who has converted one of these machines has successfully used a Homann board. Thanks for your help - it is appreciated. Andy
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