three timing belts

What shape is the pulley? Any crowning will make the belts try to climb each other.

OR make SURE that you need the inch pitch belts.

Gates shows a 5mm pitch belt 25mm wide in the 9293 series HTD belts that would likely work IF the pulleys are metric pitch.

Breco lists 1" wide .200 pitch (XL) urethane belts. Motion Industries shows various 1" wide XL belts in stock. What's the length?

McMaster carr has 1/2" wide xl belts so you would only have to run two of them instead of three :-). They have the L series (3/8" pitch) in 1' width if you can go to the bigger series.

----- Regards, Carl Ijames

Thanks for the leads. I thought I'd seen them. I just ordered the timing pulley stock from stock drive products. I could have swore they had the belt also. I need one about 18" and another about 20". I'll double check length when everything is assembled before order.

Karl

My Cincinatti machining centers use three belts on the pulleys, to connect the Spindle motor to the Spindles. They run at 10,000 RPM and 15 horsepower or so. Only has pulley flanges on the outside.

Offhand it seems to work fairly well.

OK, help me out. I just burrowed down in motion industries and can't find 1" wide .200 belts. I kept selecting product category as far as possible, then it popped up a parametric search. I entered .200 and got only selections for

Karl

Are you signed up for MotionMRO? If you have an account, it gives you access to MI's inventory, pricing and cross referencing database.

Speed Control

Jason

No ,not signed up. WHAT A GREAT PRICE! Looks like I'd better sign on.

Karl

My Cincinatti machining centers use three belts on the pulleys, to connect the Spindle motor to the Spindles. They run at 10,000 RPM and 15 horsepower or so. Only has pulley flanges on the outside.

Offhand it seems to work fairly well.

Thanks, i thought I'd seen this done. But it looks like Ned fixed me up.

Karl

I like the way you think, always did! But, even I wouldn't do that.

Don't know for sure, but I'd vote clusterfuck.

Karl - not being all that experienced in these things, but was watching "Scrapyard Challenge" recently and they had a similar problem with multiple belts climbing over each other. The solution was meticulous alignment of the 2 shafts so they were exactly parallel to each other. And these belts were getting a real hiding.....

Andrew VK3BFA.

On Sat, 18 Jul 2009 23:13:26 -0400, the infamous "Buerste" scrawled the following:

Yes, as soon as one belt got a bit of slack in it, it would flip sideways and try to ride the others. That would do one of two things: snap the loose belt or cause the adjuster to slip.

That's why triple-belted compressors have v-belts and triple pulleys, for some separation. Watch a large compressor belt setup and you'll see them flap at each other.

You just liked the part about the belts jumping each other, didn't you, Tawm?

-- Mistrust the man who finds everything good, the man who finds everything evil, and still more the man who is indifferent to everything. -- Johann K. Lavater

I like the political implications, one on the left, one on the right and one in the middle. Which one wins?

Well the one on the right was on the bottom, And the one in the middle was on the top, And the one on the left got a broken arm, And the one in the rear said, "OH Dear"

The right and left seem to take turns winning. but the middle always gets run over.

Karl

According to the late Johnny Cash:

"The One On The Right Is On The Left"

There once was a musical troupe A pickin' singin' folk group They sang the mountain ballads And the folk songs of our land

They were long on musical ability Folks thought they would go far But political incompatibility led to their downfall

Well, the one on the right was on the left And the one in the middle was on the right And the one on the left was in the middle And the guy in the rear was a Methodist

This musical aggregation toured the entire nation Singing the traditional ballads And the folk songs of our land They performed with great virtuosity And soon they were the rage But political animosity prevailed upon the stage

Well, the one on the right was on the left And the one in the middle was on the right And the one on the left was in the middle And the guy in the rear burned his driver's license

Well the curtain had ascended A hush fell on the crowd As thousands there were gathered to hear The folk songs of our land But they took their politics seriously And that night at the concert hall As the audience watched deliriously They had a free-for-all

Well, the one on the right was on the bottom And the one in the middle was on the top And the one on the left got a broken arm And the guy in the rear, said, "Oh dear"

Now this should be a lesson if you plan to start a folk group Don't go mixin' politics with the folk songs of our land Just work on harmony and diction Play your banjo well And if you have political convictions keep them to yourself

Now, the one on the left works in a bank And the one in the middle drives a truck The one on the right's an all-night deejay And the guy in the rear.. got drafted

There are a couple links on YouTube for the song: