I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end up
climbing on top of each other? In other words do I need belt guide bumpers
for each belt? (hard to do in the space available - only room for two belts
then)

..200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
..200 pitch when I started this design. Now, no can find.

Karl

Karl Townsend wrote:
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end up
climbing on top of each other? In other words do I need belt guide bumpers
for each belt? (hard to do in the space available - only room for two belts
then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

Karl




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.
http://www.gatespowerpro.com/Comerge...tNavigateFrame

industrial power Transmission, then Synchronous belts, then Power grip
HTD belts, the 5mm pitch

--
Steve W.

On Sat, 18 Jul 2009 17:00:49 -0500, "Karl Townsend"
wrote:


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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

--
Ned Simmons

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

"Karl Townsend" wrote in message
anews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room for
two belts then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

Karl

"Ned Simmons" wrote in message
...
On Sat, 18 Jul 2009 17:00:49 -0500, "Karl Townsend"
wrote:


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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

--
Ned Simmons

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

On Jul 18, 5:00*pm, "Karl Townsend"
wrote:
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end up
climbing on top of each other? In other words do I need belt guide bumpers
for each belt? (hard to do in the space available - only room for two belts
then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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.

"Ned Simmons" wrote in message
...
On Sat, 18 Jul 2009 17:00:49 -0500, "Karl Townsend"
wrote:


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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

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
1/4, 3/8, and 1/2 top width.

Karl

On Sat, 18 Jul 2009 19:33:29 -0500, "Karl Townsend"
wrote:


"Ned Simmons" wrote in message
.. .
On Sat, 18 Jul 2009 17:00:49 -0500, "Karl Townsend"
wrote:


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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

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
1/4, 3/8, and 1/2 top width.

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
180XL100 TIMING BELT
Item No.
00673536
Branch: 0
Whse: 0
Corp: 3
$6.88

Jason
200XL100 TIMING BELT
Item No.
02307250
Branch: 0
Whse: 0
Corp: 0
Price On Request

--
Ned Simmons

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
180XL100 TIMING BELT
Item No.
00673536
Branch: 0
Whse: 0
Corp: 3
$6.88

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

"Karl Townsend" wrote in message
anews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room for
two belts then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

Karl




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

Karl Townsend wrote:
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end up
climbing on top of each other? In other words do I need belt guide bumpers
for each belt? (hard to do in the space available - only room for two belts
then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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

On Jul 19, 8:00*am, "Karl Townsend"
wrote:
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end up
climbing on top of each other? In other words do I need belt guide bumpers
for each belt? (hard to do in the space available - only room for two belts
then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

Karl

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:


"Karl Townsend" wrote in message
tanews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room for
two belts then)

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.


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

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

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

"Larry Jaques" wrote in message
...
On Sat, 18 Jul 2009 23:13:26 -0400, the infamous "Buerste"
scrawled the following:


"Karl Townsend" wrote in message
ctanews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside
edge
of the pulley and three belts running beside each other? Or will they
end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room
for
two belts then)

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.


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting
in
.200 pitch when I started this design. Now, no can find.

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

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

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

Buerste wrote:
"Larry Jaques" wrote in message
...
On Sat, 18 Jul 2009 23:13:26 -0400, the infamous "Buerste"
scrawled the following:

"Karl Townsend" wrote in message
anews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside
edge
of the pulley and three belts running beside each other? Or will they
end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room
for
two belts then)
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.


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting
in
.200 pitch when I started this design. Now, no can find.
I like the way you think, always did! But, even I wouldn't do that.
You just liked the part about the belts jumping each other, didn't
you, Tawm?

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"


--
Steve W.

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

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

Karl

Buerste wrote:

"Larry Jaques" wrote in message
...
On Sat, 18 Jul 2009 23:13:26 -0400, the infamous "Buerste"
scrawled the following:


"Karl Townsend" wrote in message
ctanews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside
edge
of the pulley and three belts running beside each other? Or will they
end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room
for
two belts then)

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.


.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting
in
.200 pitch when I started this design. Now, no can find.

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

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

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


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:

http://www.youtube.com/watch?v=rhXiee1Q88A

http://www.youtube.com/watch?v=aDSN1F72QU4
--
You can't have a sense of humor, if you have no sense!