78sharpshooter Posted February 20, 2014 Share Posted February 20, 2014 i.5 HP motor spins at 1755 so the twin belt pulley is around 2.5" diameter and the belts slip to the point that the pulley gets pretty hot. I have it tensioned quite tight but was wondering if anyone else has input on how to fix this. Quote Link to comment Share on other sites More sharing options...
jeremy k Posted February 20, 2014 Share Posted February 20, 2014 Try new belts and wipe off the oil from the pulleys Quote Link to comment Share on other sites More sharing options...
Rich Hale Posted February 20, 2014 Share Posted February 20, 2014 Are they a matched set of belts? If not one of them may be loose. Quote Link to comment Share on other sites More sharing options...
doc Posted February 20, 2014 Share Posted February 20, 2014 Be certain the belts match your pulley width. V-Belts come in different widths A, B, C etc;. Quote Link to comment Share on other sites More sharing options...
MLMartin Posted February 20, 2014 Share Posted February 20, 2014 You can also buy belt dressing. A spray that is tacky and helps to stop slipping. Works well on my 50lb Also I have a 3.25 inch pulley, the size recommended by Sid of little giant. It seems a bit to fast to me. How do you like the 2.5" ? Quote Link to comment Share on other sites More sharing options...
macbruce Posted February 20, 2014 Share Posted February 20, 2014 You should only need one belt to transfer 1.5 hp....IE; it's easier to tension one belt instead of two. Quote Link to comment Share on other sites More sharing options...
78sharpshooter Posted February 21, 2014 Author Share Posted February 21, 2014 I forgot to mention that it is 2 link belts from HF (http://www.harborfreight.com/vibration-free-link-belt-43771.html) And this is the pulley I bought http://www.surpluscenter.com/Power-Transmission/Pulleys/Finished-Bore-Pulleys/2-55-O-D-7-8-BORE-2-GROOVE-PULLEY-1-2BK25-D.axd Quote Link to comment Share on other sites More sharing options...
macbruce Posted February 21, 2014 Share Posted February 21, 2014 Which pulley did you buy?.................. Belt Type A (1/2") Datum Diameter 1.90" Belt Type B (5/8") Datum Diameter 2.30" Quote Link to comment Share on other sites More sharing options...
78sharpshooter Posted February 21, 2014 Author Share Posted February 21, 2014 The pulley accepts both belt sizes Quote Link to comment Share on other sites More sharing options...
doc Posted February 21, 2014 Share Posted February 21, 2014 macbruce , Looks like this pulley will take either A or B according to the spec sheet. Quote Link to comment Share on other sites More sharing options...
Jason M Posted February 21, 2014 Share Posted February 21, 2014 I know that there are specifications as far as amount of contact a belt should have around the circumference of a pulley. I Googled minimum belt contact and found one document that might help.V-Belt Design Manual - Bando USAhttps://www.google.com/url?sa=t&source=web&rct=j&ei=lK0GU9SmJqKz2QXM2oG4Ag&url=http://www.bandousa.com/html/pdfs/bu-143manual.pdf&cd=1&ved=0CCQQFjAA&usg=AFQjCNGxka9DaA7KrmorEszkUYz5L4WZaQ Quote Link to comment Share on other sites More sharing options...
macbruce Posted February 21, 2014 Share Posted February 21, 2014 macbruce , Looks like this pulley will take either A or B according to the spec sheet. Ahh, never seen that before........ B) So that can't be it. Quote Link to comment Share on other sites More sharing options...
arftist Posted February 22, 2014 Share Posted February 22, 2014 Is there excess friction in the tup guide? are the pivot points in the Dupont linkage well lubed? Quote Link to comment Share on other sites More sharing options...
notownkid Posted February 22, 2014 Share Posted February 22, 2014 Start with the basics get 2 new belts. Gates no longer make matched sets of belts. They claim manufacture is so good all belts match????? Try to get the Industrial, equipment type belts, Gates & Napa call them Green Belts, they are better for this type use than automotive belts. Be sure to clean and sand the pulley grooves to get old oil or rust build up out. Belts look for a reason to slip. Quote Link to comment Share on other sites More sharing options...
timgunn1962 Posted February 22, 2014 Share Posted February 22, 2014 Definitely new belts. If you don't need to open the belt to fit it, raw edge wedge belts with a cogged form on the inside are better than either wrapped wedge belts or the older vee belts when you have to contend with small pulleys and minimal wrap. Gates seem about the best I've tried and the lengths really are that consistent. Do a really good job of degreasing the pulleys (both of them) and it might well help to take any polished surface off the small pulley. Blasting works well, but a quick once over with a fairly coarse abrasive cloth is better than nothing. If they have been slipping, check the small pulley still has V-shaped grooves. If they are starting to wear U-shaped, even slightly, replace the pulley. Link belts are only really a good idea for stuff where the belt has to be split to install it. I think the link belts claim to be stronger and more vibration-resistant than conventional belts is based on the old 1950s-spec Vee belts. The latest generation wedge belts are, as you'd expect, also way ahead of the 1950s stuff. Gates had their "Quad-Power" belts maybe 20 years ago that would transmit 4 times more power-per-belt than the old ones would and things have moved on since then. Quote Link to comment Share on other sites More sharing options...
peacock Posted February 23, 2014 Share Posted February 23, 2014 Are you sure you are running the belts the right direction? Link belts have arrows on the back to show which way to run them. They don't grip well the wrong way. Quote Link to comment Share on other sites More sharing options...
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