| Gallery, Projects and General > How do I?? |
| Mini Lathe Speed Reduction....... |
| (1/9) > >> |
| Stilldrillin:
Early on, last year. I replaced the motor and pc board on my Real Bull mini lathe........ http://madmodder.net/index.php?topic=4962.0 As it was all done in a bit of a rush at the time. I now intend to finish the job, properly. Including reducing the belt ratio, as posted by Loply, around ½ way down the page....... http://madmodder.net/index.php?topic=4946.0 This motor/ board set up is a lot more lively than the old one. Giving less torque, and 1,287/ 2,920 rpm, instead of the promised 1,100/ 2,500. So, first I need to slow it down to spec'. This is my board. MAX, MIN, IR, CL ....... Also, ACCEL......... Do I switch on, and reduce revs to 1100, using the MAX pot? I've heard mention of higher torque, through twiddling........ What can I achieve, and how, with the other pots? Or, should I leave well alone?? David D |
| John Rudd:
David, If in doubt dont do it...As my dad would say.... Can you afford to lose another board? I'd say that to gain more torque at lower speed, you need to do it mechanically(keep the motor running high and reduce the speed thru a cog box)...The current setup isnt capable of more torque at lower speed..besides running the motor at lower speeds for more torque will cause the motor to overheat (poor cooling....) |
| andyf:
David, When all else fails, read the instructions... I think you know where to find them. You should be able to rein back the speed with the MAX trimpot, though it does look as though it interacts a bit with the MIN, so a bit of toing and froing might be needed. I'd hazard a guess that the IL trimpot might raise the limit of the current which the board supplies to the motor, thereby increasing the torque. Instructions on p19 of the online manual. But get a second opinion from Dave BC or someone else who knows what he is talking about before you twiddle. Looking back at your "It doesn't work any more!" thread, I see that it concluded with the news that Dave had repaired your old board, so I suppose the last resort is to put it back in, unless he is holding it to ransom. Andy |
| Troutsqueezer:
Speaking as an EE (my day job) I would recommend leaving well enough alone unless you have a thorough understanding of the safe operating areas (how they are biased and where along the load line they are operating) of all components involved and maybe an understanding of phase angles...well, you get the point. There is much to consider when making adjustments to circuitry of this nature, things that unless you designed the circuit, you have no way of knowing. Maybe you can tweak the pots and everything will be ok, and...maybe not. |
| Stilldrillin:
John, Andy, Dennis. Thanks for your comments, and cautions, which I have taken on board...... :thumbup: Andy, the only online instruction manual I can find is this one.... http://www.kbelectronics.com/manuals/kbic_manual.pdf Section 7 deals with twiddling. Is this the manual you are referring to? :scratch: The old, repaired board, is still residing with Dave. We'll meet up, sometime. No ransom has been mentioned, as yet! :D David D |
| Navigation |
| Message Index |
| Next page |