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| Torque increase on a 7x? |
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| John Rudd:
Bottom line on this is change to a bigger motor... All you are doing is using the exisiting torque developed by the motor but at a reduced speed...Obvious I know.. Changing to a bigger motor isnt really the best idea either because ultimately the lathe has been sized for a certain size motor, increasing the motor will potentially stress the bed......... Or am I being pessimistic here? :scratch: |
| modeldozer:
Hi On changing the pulley ratios have a look at my post, some of the collective has posted the detais there. http://madmodder.net/index.php?topic=4946.0 Abraham |
| picclock:
@ John Rudd A bigger motor may (or may not) makes things easier but its not so simple. The main problem is that the cutting speeds tend to be the limitation at these sizes. I can easily exceed the recommended cutting speeds for HSS and carbide on 5-6" work, so there really isn't much point in going faster and no point in having a larger motor unless it will work the whole speed range without gear changing. A bigger motor may produce more torque for deeper cuts, but the existing one will do 20-30 thou cut depth on 5"+ steel which is quite good for a non production machine. Best Regards picclock |
| andyf:
Picclock, looking at your photo, is the motor in its original orientation with the drive shaft sticking out beyond the headstock? If so, :scratch: won't your 3:1 gears reverse the direction of the timing belt and spindle? I know you could simply swap over the forward/reverse labels on the switch, but it seems to be a feature of these DC permanent magnet motors that they only run backwards at about half normal speed. Andy |
| Stilldrillin:
--- Quote from: andyf on May 24, 2011, 04:58:18 AM ---There are one or two speed reductionr/torque increase projects shown in the Photos section of the 7x12 minilathe group ( http://groups.yahoo.com/group/7x12minilathe/ ), if you want to join it. Look particularly at the albums "Belt Drive" and "Trevor's Lathe Mods". Received wisdom from that group is that the timing belt and toothed pulleys may not be to a standard pitch. I'm not sure about that; this page about a speed reducer http://www.mini-lathe.org.uk/torque_gear_replace.shtml implies that it is standard. Andy --- End quote --- Andy. My observation of my Chester's belt..... Marked, 1.5m-70-9.5 ..... 9.5mm wide, 3/16" pitch My spare, from a little used Warco.... Marked, 1.5 70 ..... 9mm wide, 3/16" pitch My pulleys are 17t x 31t. Dunno if this info is of any use at all. But I feel I'm being helpful...... :thumbup: David D |
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