[AT] all about running flat belt equipment

[Steve W.]

Ralph Goff wrote:
> On 3/15/2016 12:04 PM, Steve W. wrote:
>> Basically the paper ones are stacks of cardboard held together with
>> waterproof glue. Then pressed to force the glue through the pores in the
>> paper. They set under pressure and heat till the clue dries. Toss them
>> on a lathe to true up the surface and you're done.
>>
>> Paper and leather were used because they were easy to find and easy to
>> check for problems. Wood gets used on slower speeds but it has to be
>> VERY straight grained and clear of any issues.
>>
> Its interesting you mention wood as I have wondered if a guy could just 
> turn one out on the wood lathe out of a piece of elm or maple.
> Or maybe some laminated?
> 
> Ralph in Sask.
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Usually they use laminated maple with the grain running perpendicular to 
the shaft. I've made wood and paper ones myself for various uses. Wood 
is faster to make but doesn't have the friction to handle much power 
once you get under a 1' diameter.

Paper is easy to work with, Basically you use heavy kraft stock layered 
with a waterproof glue then pressed to remove any air and bond the 
sheets. Once dry you turn it on a lathe.

Crowning is an important step, There is a nice bunch of math available 
to give you a "perfect" crown based on belt speed, material, friction 
type and ......    The easy way is 1-2% of crown per the width of the 
pulley for anything up to 4" wide, 4" and up 1/2 - 1%,  Best for flat 
belt wear is a full radius crown.

-- 
Steve W.