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| Mini Lathe Speed Reduction....... |
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| Stilldrillin:
Over seven years of belt crud........ Less, a rub with a rag! :D David D |
| Stilldrillin:
I finally got some meaningful workshop time, these past few days. Modded the 12 tooth motor pulley, by boring to suit, and sleeving the boss o/d, to take an M3 grubscrew. Needs a tidy up, and a shorter screw, but you get the gist of it........ Removed the flanges from the driven pulley. Faced, bored 10mm, and roughed the keyway...... Then turned away the large boss. The lathe was pulling like a train! Who needs speed reduction? Filed the keyway. Installed nicely, inside the new recess in the bearing spacer...... Tried the new cradle mounting idea, on the old motor........ Time to remove the motor to swap pulleys, and cradle. Ah! Whaat! :bugeye: Perhaps this is why the motor's a bit noisy......... Bugga!!!!!!!! :bang: :bang: The new(ish) motor is 11mm longer in the plastic brush housing end. I knew it was a neat fit inside the bed casting. But not to cause damage..... No problem! I'll just swap ends! No I won't! Not compatible, at all......... :palm: BUT...... That wasn't the end of it! As Dave BC had fixed the blown board. Bless Him! :thumbup: There must be nothing wrong with the old motor, except the cracked fan blade. :thumbup: :thumbup: This will suffice, until I can get the broken motor replaced. Swapped to the old motor. Switched on. With speed controll set at zero. It took off at full revs, then stopped with a POP!!! :bang: :bang: We've been here before, haven't we............. :bang: :bang: :bang: Walked out. Locked up. Went and had me tea. And a real good good sulk........ :( :( Sigh......... David D |
| Bluechip:
:( :( :( :( :( Strewth. It is a bit moth eaten isn't it ??? Commutator looks none too healthy anyway. All that black ... er... whatever it is ... doesn't seem right. The old motor looks better, just a dark smear where the brushes bear on the copper is about normal. Oh dear ... Oh dear, Oh dear Oh dear ... BC |
| lordedmond:
Dave I have to agree completely with dave BC on the condition of the comms the old first duff one looks just about perfect but the new duff one is well ugly not fit for man or beast. but it could be many things bad neutral or wrong grade of brush , we used to aim for a nice shiny chocolate colour, it also relates to the load on the motor Stuart |
| Stilldrillin:
Well..... Finally got this job sewn up! (All bein' well)....... :thumbup: Dave Bluechip called this morning, with some test equipment, and also returned my original, repaired board. There's nowt wrong with either motor. Electrically.......... Which was a bit of a surprise! :scratch: Therefore the intermittent fault must lie inside the 8yr old control box. Fortunately, I bought one from Amadeal a few days back! It's a bit larger than the original Chester box........ So, two more M5 mounting holes were drilled, higher up the casting........ Nice new 400w motor, from Chester........ Getting to be a bit of a mongrel, now......... I ran the motor for a few minutes, to bed in a little, then checked rpm. Low gear, 800rpm. High gear 1800rpm. That'll do for me! Only had time to face a piece of 1" steel. It performed beautifully! When really heavily loaded, it just 'dug in', and kept going! :D Rather pleased! Thanks everyone for your input....... Especially, Mr. BC! :clap: :clap: David D |
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