Calculating XL 037 belt lengths

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Subject Author Date
Calculating XL 037 belt lengths Andrew Mawson 06-28-2008
Posted by Andrew Mawson on June 29, 2008, 10:30 am
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> Andrew Mawson wrote:
> >>> David Littlewood wrote:
> >>>> In article
> >>>
> >>>> john@stevenson-engineers.co.uk writes
> >>>>>> Yes, the calculator looks good - if it suits. However, if I
> > have
> >>>>>> understood it correctly, it seems to restrict the belt tooth
> > pitch to a
> >>>>>> set of stock sizes, which as it happens does not include my
> > 4.5mm pitch!
> >>>>>> Glad it worked for you though.
> >>>>>>
> >>>>>> David
> >>>>>> -- David Littlewood
> >>>>> That's because a 4.5mm belt isn't a standard size.
> >>>>>
> >>>> Pity no-one told the makers of my sander (Elu) then. Wonder
where
> >>>> they got it from.
> >>>> David
> >>> David,
> >>> You said " measured over 10 teeth" ie 9 gaps/pitches
> >>> Is it possible you measured over 9 tooth pitches and divided by
10?
> >>> Just a thought
> >>> I can't imagine why Elu would not use standard parts.
> >>> Bob
> >> Well, that's a very sensible question, Bob, but no, I measured
over
> > 10
> >> teeth and 10 gaps. Just to make sure (I didn't think I had made
such
> > an
> >> error, but it never hurts to check*) and it is definitely 4.5 mm
> > pitch.
> >> Machine is at least 20 years old, maybe a sign that times were
> > different
> >> then, or the fact that the maker was (IIRC) Swiss (later I think
> > bought
> >> out by Black & Decker).
> >>
> >> *Well, I say it never hurts, but this time one of the brushes
popped
> >> out, took several minutes of fiddling to get it back....
> >>
> >> David
> >> --
> >> David Littlewood
> >
> > I've fallen foul of non standard length belts before now but not
odd
> > pitches. My coin counter uses an inverted toothed belt as
transport
> > for coins, and is a 'special' only available from the makers in
> > Japan - 51 tooth iirc with no length adjustment.
> >
> > AWEM
> >
> If I did not know why you might count enough coins to wear out a
coin
> counter belt, I might be tempted to visualise you as a miser! LOL
> (instead of the generous chap you really are!)
> Bob

Yes I never thought that counting money could be boring, but believe
me it is. Particularly when you know that the majority is destined for
the gas man, the electric company and the landlord !

AWEM


Posted by David Littlewood on June 28, 2008, 10:21 am
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>My Skill 1400H1 belt sander gave up on me today - unreasonable really
>as I only bought it 14/01/1982 (yes I have the receipt!!!!). The drive
>belt has disintegrated leaving only a fraction of shredded material
>that measures as an "XL 037" (3/8 wide 0.2" pitch) Cannot trace
>original spares but it has a '14 notch' and a '28 notch' wheel mounted
>on 98mm centres. How do I calculate how many teeth on the belt ?
>
Hi Andrew,

I don't have the same sander, but I looked at mine (an Elu MHB 157/02,
belt is a SuperTorque 57924626)) and it measured thusly:

Wheels 110.5 mm between centres. Small wheel 20mm across teeth, ~17mm
across core; large wheel 38mm across teeth, didn't measure across core.

Belt 70 teeth, pretty 4.5 mm pitch (measured across 10 teeth).

Playing around with the numbers, I can approach a good match by assuming
that the belt goes exactly half way round each wheel, the outer diameter
of the wheel is the effective diameter, and the straight bit each side
is equal to wheel spacing*, thus:

Belt measurements 70 x 4.5 mm = 315 mm

Estimate (20+58) x pi/2 = 91.1, plus 2 x 110.5 =221, i.e. 312.1 mm

Error could be slight inaccuracies in measurements, more likely to be
because the use of the outer diameter of wheels to get wrap-around is
slightly too small - the continuous part of the belt sits *outside* the
teeth of the wheel. Adding 1.0 mm to the diameters (i.e. 0.5 mm per
side, looks about right) comes out very close - 315.2 mm. You should
check this addendum looks about right for your belt/wheels.

Hope this helps (but if you end up with the wrong size, you get no more
than your money back!). You will have to do the maths yourself as you
didn't state the diameter of the wheels.

*I know it isn't quite right, but the errors seem to cancel out quite
well, at least for mine.

Regards,

David
--
David Littlewood

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