February 20, 201412 yr 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.
February 20, 201412 yr Be certain the belts match your pulley width. V-Belts come in different widths A, B, C etc;.
February 20, 201412 yr 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" ?
February 20, 201412 yr You should only need one belt to transfer 1.5 hp....IE; it's easier to tension one belt instead of two.
February 21, 201412 yr Author 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
February 21, 201412 yr Which pulley did you buy?.................. Belt Type A (1/2") Datum Diameter 1.90" Belt Type B (5/8") Datum Diameter 2.30"
February 21, 201412 yr macbruce , Looks like this pulley will take either A or B according to the spec sheet.
February 21, 201412 yr 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
February 21, 201412 yr 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.
February 22, 201412 yr Is there excess friction in the tup guide? are the pivot points in the Dupont linkage well lubed?
February 22, 201412 yr 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.
February 22, 201412 yr 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.
February 23, 201412 yr 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.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.