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| Torque increase on a 7x? |
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| websterz:
I have seen references to using a smaller timing belt pulley on the motor to increase torque. Has anyone done this mod, and if so, was it a noticeable increase? I started building my ER32 collet chuck today and have had some stalling issues, mainly due to the 3.75" diameter material I am using. Now that I have the metal drive gears and tapered roller bearings I want to squeeze a little more low end OOMPH out of my 7x12. Not being really up on my timing belt lingo I am not sure what to even look for in a smaller pulley. The sites I visited had loads of nice new metal pulleys but they wanted to know stuff like the pitch, hub thickness, etc. Dammit Jim, I'm a machinist, not an engineer! :doh: Can someone hold my hand and get me where I need to be? |
| Stilldrillin:
Good Question! :clap: Me too..... :thumbup: David D |
| andyf:
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 |
| Jonny:
Change the motor is your best bet. I have one here in a tool cabinet in larger lathe almost brand new gathering dust, cant do a thing with it probably wants triple the amount of torque to make useable. |
| picclock:
Hi The easiest way is to use an idler shaft, then use a reduction gear to the idler and a further reduction via athe belt drive. I've dove this on mine and can turn 5" dia steel all day long. There are quite a few plans for this type of mod on the 7x12 group. http://groups.yahoo.com/group/7x12minilathe/messages I did it differently http://s917.photobucket.com/albums/ad19/picclock/?action=view¤t=DSC02448.jpg originally so that I could put the end on and have it all fit. I think I put the end back once and now leave it with the gears exposed all the time because it speeds up changing them. A better way may be to use the reduction gearing off of an old battery powered drill. If you get the right type it will give two geared speeds + it will have a torque limiting ratchet that can be set. with the other gears this will give 4 speeds. If I can ever get hold of a decent scrap battery drill I may well give it a go, just for the extra ratio's. The belt on mine has steel reinforcing and the belt and timing sprockets came from Technobots. Good luck picclock (ps once you have all this torque you will want to ditch the compound for a solid block to improve rigidity) |
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