开云体育

I recently found a hardware store that used to sell unimats. They had
a couple of belt sets that are still in the package. These belts look
like twisted rope, but on one of my units I got these belts with it
and they work pretty well. My question is do the newer belts available
on the net or eBay perform better than these older style belts.

Thanks

Tughom

Hello Tughom,

The old twisted rope type belts did work OK. They were made of
polyester thread twisted and coated with black rubber of some kind.
How they got the rope to retain the twist is a mystery to me. Anybody
know more about this? The major negative of these belts is that when
they get warm they thow sticky black dust everywhere. As you might
surmise at high speed or heavy load they do stretch.

I like the polyethylene solid belts the best but the black 'O' rings
in the right size work fine also.

Best, Cary Stewart

--- In UNIMAT@..., "tughom" <tughom@...> wrote:

I recently found a hardware store that used to sell unimats. They had
a couple of belt sets that are still in the package. These belts look
like twisted rope, but on one of my units I got these belts with it
and they work pretty well. My question is do the newer belts

available

on the net or eBay perform better than these older style belts.

Thanks

Tughom

On Thu, 2007-01-18 at 22:29 +0000, caryscotthere wrote:

Hello Tughom,

<snip>

The old twisted rope type belts did work OK. They were made of
polyester thread twisted and coated with black rubber of some kind.
How they got the rope to retain the twist is a mystery to me. Anybody
know more about this?

<snip>

I think they spin the yarn in Z twist (anticlockwise) and ply it in S
twist, kind of pre-loading it to retain the twist.
(From dim memories, correct me if I'm wrong.)

Clay.

Thanks for the info.

Clayton Bonser <claybonser@...> wrote: On Thu, 2007-01-18 at 22:29 +0000, caryscotthere wrote:
> Hello Tughom,
>

<snip>

> The old twisted rope type belts did work OK. They were made of
> polyester thread twisted and coated with black rubber of some kind.
> How they got the rope to retain the twist is a mystery to me. Anybody
> know more about this?

<snip>

I think they spin the yarn in Z twist (anticlockwise) and ply it in S
twist, kind of pre-loading it to retain the twist.
(From dim memories, correct me if I'm wrong.)

Clay.








---------------------------------
Now that's room service! Choose from over 150,000 hotels
in 45,000 destinations on Yahoo! Travel to find your fit.

At the risk of getting a bit OT, another bit of the memory about getting
those plied belts to lay up correctly.

As I recall, each ply is made to twist as the cord is plied. A simple
demonstration with a piece of string:

Double the length of string over, and pinch both loose ends betwixt
forefinger and thumb. Slide the tip of the forefinger over thumb,
causing both ends of the string to twist in the same direction. The
string will lay up in a two ply form. Fix the ends together with some
tape or a bulldog clip or the like.
Now, without allowing the ends to untwist, it will be found that
attempting to undo the laying up will be resisted, and the string will
spring back into the plied form.

Likewise, the belts won't come from together without the ends of each
ply being allowed to untwist.

That's all,
Clay.