[AT] WAS: Snow Blower now Belt Dressing

Larry Goss rlgoss at insightbb.com
Wed Aug 18 10:51:40 PDT 2010


Alignment on a flat belt is almost a "no-brainer".  When a belt wants to walk it is going toward the LONGEST distance between centers it can possibly find.  It involves more than just getting the input and output axles lined up, but one of the pulleys needs to have a slight crown to it so the longest distance between rotating centers is always in the center of the belt.  If you don't have that condition because of limitations on what you can do with your belting situation, it will always cause you trouble.  If you have ever looked closely at a line shaft installation, you will find at least one pulley in every pair is crowned.  Cast iron pulleys are made that way on purpose.  It isn't just that having the parting line in the middle of the pulley was easy -- it is necessary.  We had trouble keeping the flat belt on the hammer mill when we first bought it and tried to power it with our John Deere.  So Dad wound several layers of friction tape around the center of the pulley on the mill so it was slightly crowned.  It solved the problem, and I found out at an early age that friction tape isn't just for the handles of baseball bats.

For those of you with band saws in your shop, look closely at the pulleys, and see how changing the adjustment of the angle changes the location of the saw blade as it rotates.  Belt sanders work similarly.

Larry

----- Original Message -----
From: "Gunnells, Bradley R" <brad-gunnells at uiowa.edu>
Date: Wednesday, August 18, 2010 11:24
Subject: Re: [AT] WAS: Snow Blower now Belt Dressing
To: Antique tractor email discussion group <at at lists.antique-tractor.com>

> Thanks Mike. I guess I should have mentioned it's a flat belt. 
> When cutting the blade slows considerably and that is when it 
> tries to walk off the pulley. If I could get it to not slip then 
> I can fiddle with the alignment.
> 
> Thanks everyone
> Brad
> On Aug 18, 2010, at 11:00 AM, Mike Sloane wrote:
> 
> > Bread - It has been my experience that a belt coming off the 
> pulley is 
> > usually the result of conditions not related to the need for 
> "belt 
> > dressing".
> > 
> > One cause is an old belt that has softened or been damaged and 
> no longer 
> > maintains its profile. Another problem is a decent belt but 
> one with the 
> > wrong "V" profile, causing it to ride incorrectly in the 
> sheaves. While 
> > most older machinery used "A" or "B" profile belts, some folks 
> > substitute "fractional horsepower" belts that look similar but 
> have 
> > different profiles and work poorly, if at all.
> > 
> > If it is a flat belt, then I would check to make sure that the 
> pulleys 
> > are in precise alignment - even being slightly off could 
> result in the 
> > belt coming off under load. (Ralph - Princess Auto closed all 
> their US 
> > operations several years ago, and I miss them.)
> > 
> > Mike
> > 
> > On 8/18/2010 11:24 AM, Ralph Goff wrote:
> >> Brad I don't know if you can still get the solid stick type 
> belt dressing as
> >> its been years since I got one. The latest I use is in a 
> spray can and it
> >> seems to work well too. Not sure if the last can was from 
> Princess auto or
> >> Peavey Mart but it should be available where you are.
> >> 
> >> Ralph in Sask.
> >> 
> >> ----- Original Message -----
> >> From: "Gunnells, Bradley R"<brad-gunnells at uiowa.edu>
> >> To: "Antique tractor email discussion 
> group"<at at lists.antique-tractor.com>
> >> Sent: Wednesday, August 18, 2010 6:30 AM
> >> Subject: [AT] WAS: Snow Blower now Belt Dressing
> >> 
> >> 
> >>> Seeing this video and Ralph cutting wood with a buzz saw 
> reminded me of a
> >>> question I was going to ask the list.
> >>> 
> >>> Does anyone know a source for belt dressing? A brand name or 
> place (such
> >>> as TSC) where one might find it? I got the old buzz saw out 
> a while back
> >>> and was cutting some small stuff and the belt was slipping 
> and sliding off
> >>> the pulley. Once it recovered the belt would return to the 
> proper place. I
> >>> assumed some dressing on the belt would help with the power 
> loss and it's
> >>> tendency to slip off.
> >>> 
> >>> Thanks
> >>> Brad
> >> 
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