Best replacement belts?

Cadillac STS

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The belts are 5/8 belts and they cause a significant shaking while running.

What are the best replacements for less shaking?

The link type seem best but the 5/8 one is not suppposed to go on less than 3 inch pulley.

Would the 1/2 inch link belts work?

What are people doing for belts with less shaking?
 
is the shaking causing surface finish problems or is the belt slipping or misaligned?
 
If the belt has a "set" from being flexed around the small pulley this could cause some vibration.

If you want a solid belt with more flexability, try a cogged "B" size belt.

V Belts 4 Less
 
I use 5/8" Fenner belts on my RF-31 and have no issues at all. Quieter and no significant vibration or slippage.
 
I use 5/8" Fenner belts on my RF-31 and have no issues at all. Quieter and no significant vibration or slippage.

Nice to know, I want to go that way.

Not slipping or misaligned. It is a CNC mill so want to get rid of any vibration possible; if it were just used as a drill press I would be happy with it as it is.

The mill is new to me but I can feel a vibration with the motor on. I've had nice results with the Fenner belts but not sure of the fit.
 
No matter what belt you run, there will be some vibration. The Fenner belts do run much smoother than the V-belts, though. I had a mean harmonic at 1800 rpm with the V-belt and the Fenner belt resolved it completely.
 
It appears that Fenner has five types of belts. Which type are you speaking of, Mike?
 
I use fenner's on my ww tools. But I found the mill to be objectionably loud with them on and since we can reverse a mill, I replaced it with a cogged belt. They are very good, don't take a set, and are less noisy. Not as quiet as I hoped for, but better than my fenner belts.
 
It appears that Fenner has five types of belts. Which type are you speaking of, Mike?

I'm using the Power Twist Plus, B-type belt. My mill is currently obstructed by stuff (new shop extension in progress) so its hard to get to but I know its a B-type belt.
 
I'm using the Power Twist Plus, B-type belt. My mill is currently obstructed by stuff (new shop extension in progress) so its hard to get to but I know its a B-type belt.
So it is a V belt, higher quality version? Edit: I looked it up and see it is a link belt.
 
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