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| Meldonmech:
I have a tapping head which I want use, but have no room behind the drill to use your idea. I have bought speed controller and am now looking out for a 220/ 440 dual voltage motor. Cheers David |
| mechman48:
Hi all For further info on pulley calc's I have att. pdf for ref. for everyone. Cheers George |
| mattinker:
--- Quote from: Meldonmech on November 26, 2013, 03:57:15 AM --- I have a tapping head which I want use, but have no room behind the drill to use your idea. I have bought speed controller and am now looking out for a 220/ 440 dual voltage motor. Cheers David --- End quote --- A thought, you don't have to put the motor behind the drill, it could be next to it or above! Mount it the other way up, motor up instead of down. Just my 2 €cents, regards, Matthew |
| Joe in Oz:
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 |
| hanermo:
Toothed belt == timing belts. The normally accepted max transmission with belts is about 1:3 or 1:4. Ie You need 14 teeth in HTD to get good belt wrap. (12 teeth) is not good, although they are sold. A 50 teeth pulley at 1:3.57 is already about 10 cm in diameter, and 30€ each. You need good belt wrap (so small size cannot be too small) and as good a rigidity as practically possible (shorter belt is better). E.g. If your big pulley is say 140 teeth (for 1:10) the belt becomes very long, as you wont get good wrap near the small pulley. And thus you have a lot of space between the pulleys, which reduces rigidity. So for 1:10. you would get 238 mm between centers, a very long distance. Here is a calculator. http://www.sdp-si.com/cd/default.htm A 72 teeth pulley is 40$. https://sdp-si.com/eStore/Catalog/Group/346# 140 will be about 100$++. (Very little production). |
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