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Question about V-Belts

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Forum topic by b2rtch posted 08-19-2012 09:38 PM 1073 views 0 times favorited 10 replies Add to Favorites Watch
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b2rtch

4351 posts in 1801 days


08-19-2012 09:38 PM

Topic tags/keywords: question jointer

As some of you know I just finish rebuilding a Powermatic 60 jointer.
I installed a new 3 HP motor and I am using the original 2V-Belts pulleys with 2 new twist belts.
It seems that I had to re-tension the belts every day, which tells that I probably exceeded the belts power/torque transmission ability.
I also have a Unisaw with a 3HP motor and it uses three of the same twist belts.
I never yet had to re-tension the belts.

I looked on line for some kind of table indicating the maximum power/torque for V-belts but except for some very technical stuff, I could not find any information.

Interestingly enough on the parts catalog for the new Powermatic 60 with a 3HP motor there is only one belts.
I suppose they use one of this new multi-rib/serpentine belt.

It seems time that I am going to have to replace the pulley with 3 grooves pulleys to accept a third twist belt or may install multi-rib pulleys and belt.

What do you think?

-- Bert


10 replies so far

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oluf

257 posts in 1792 days


#1 posted 08-19-2012 11:27 PM

You can get great advise and quality products here, Thier prices are also veyr good. VBeltSupply.com thier toll free number is 1 888 291 5450 and a belt expert will awnser the telephone.

-- Nils, So. Central MI. Wood is honest.Take the effort to understand what it has to tell you before you try to change it.

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b2rtch

4351 posts in 1801 days


#2 posted 08-19-2012 11:28 PM

oluf, thanks

-- Bert

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Dusty56

11688 posts in 2441 days


#3 posted 08-19-2012 11:35 PM

Hi Bert , my ‘50’s vintage Powermatic 60 only has one V pulley and belt. Have you run the jointer for any period of time to let the belts settle in / stretch out / find their groove ? LOL
Is it just the weight of the motor applying tension to the belt(s) ?

-- I'm absolutely positive that I couldn't be more uncertain!

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rance

4149 posts in 1913 days


#4 posted 08-19-2012 11:52 PM

I think your tensioner(or motor mount) is slipping.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

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Dusty56

11688 posts in 2441 days


#5 posted 08-20-2012 12:03 AM

Bert , your headline is about V-belts and your post is about Twist-belts…what’s the story ?
Are you referring to Link-Belts , such as the Red or Green ones ?

-- I'm absolutely positive that I couldn't be more uncertain!

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MrUnix

662 posts in 952 days


#6 posted 08-20-2012 12:18 AM

I’ve had good success with kevlar belts which have very low stretch and high durability.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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b2rtch

4351 posts in 1801 days


#7 posted 08-20-2012 12:20 AM

” Are you referring to Link-Belts , such as the Red or Green ones ?”
Yes, I use the HF one.
I do not think that my adjuster is slipping as I use 4×5/16 cap screws and I make sure to torque them real good.
I believe that the belts are stretching.

-- Bert

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Dusty56

11688 posts in 2441 days


#8 posted 08-20-2012 12:52 AM

Hi Bert , I have used the HF belts as well and had to run my machines for a while to let them settle into place.
My machines just had the weight of the motor tensioning the belts though. Do you have the belts running in the right direction ?

-- I'm absolutely positive that I couldn't be more uncertain!

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ChuckV

2487 posts in 2280 days


#9 posted 08-20-2012 01:49 AM

Bert,

The installation instructions for Power Twist belts (http://www.fennerdrives.com/assets/ptpinstall.pdf) says this:

VI. Retensioning
Like all high performance V-belts, PowerTwist Plus V-Belts require the maintenance of correct
drive tension to operate efficiently. Experience indicates that drive tension should be checked after
24 hours running at full load. A retension may be necessary depending on the severity of the drive.
Any initial belt stretch is then taken up. Subsequently, belt tension should be checked periodically
and adjusted when necessary.

-- “While the world with closed eyes sleeps, The sky knows and weeps - steel rain. ” ― Nathan Bell

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b2rtch

4351 posts in 1801 days


#10 posted 08-20-2012 09:52 AM

“Do you have the belts running in the right direction ? ” and what is the right direction?
At one time I read that there are arrows on the belts, indicating the rotation.
I never could see one.

Thank you Chuck, I shall spend sometime this site to checking the instruction

-- Bert

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