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| Manxmodder:
--- Quote from: Joe in Oz on June 01, 2014, 08:30:55 AM ---For future reference of others: One of the better ways of getting a MUCH bigger ratio that with V-belts is to use a pair of tooth belt pulleys and belt. Something like 10mm wide XL belt is likely to be strong enough and will allow a ratio of something like 10:1 quite eaily in the space of the original belt cover. So a 1440rpm motor will give you a spindle speed of 144rpm. Bigger ratios are achievable with intermediate pulleys and short belts, so even inside the original space you could envisage 2 lots of 10:1 for just 14.4rpm spindel speed - woth probably large tap breaking torque! Cheers, Joe --- End quote --- Hi Joe, I agree with your suggestion as a space saver but in a situation like this I would use a poly V belt and machine my own pulleys to suit the speed requirements....OZ. |
| Joe in Oz:
Hi hanermo and Manxmodder, thanks for the responses! All useful information! My suggestion was based on my own use of toother (timing) belts and the commercial use of themin MUCH greater ratios than obviously recommended. In one application I have here the ratio is 10:1 using only 8 teet on the driving pulley with a much larger belt (can't recall the pitch but its size if that of a small car engine's timing belt. The little electric scooters you see around with 200W 24V motors also use toothed belts for their drive at very high ratios with a finer pitch. I've used those pulleys and belts - and motors - quite bit (Having to machine much of the integral rear wheel off to use them for my purpose....). XL pulleys and belts are available at much lower costs than your reference hanermo (e.g. http://www.ebay.co.uk/itm/190920642741 and http://www.ebay.co.uk/itm/331210061601). Poly-V belts are an option that makes a lot of sense! I have not sued these myslef, but I have a very high speed drill press that currently runs on its last legs with a tiny flat belt which is no longer available easily. I might consider that when the time come comes. THe current pulleys ar thick enough in their periphery to trun them into poly-V pulleys. Thanks for that input! Cheers, Joe |
| velocette:
Hi I will recommend "Poly Vee" belts instead of 'Vee Belts" on any workshop machines. Having a Lathe, Mill Drill, Vertical Bandsaw, and Two Drill Presses on "Poly Vee" drives makes me more than a bit biased. They are a lot less likely to slip even at low speed on the bandsaw drive from the 18 to 1 gearbox. Eric |
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