Can someone tell me where I might get these. I need one about 75mm OD
and a second about 170mm. I upgraded the motor to my circular saw (the
smoke got out of the old one, and once it's gone they stop working !)
and the new motor has considerably more power which is not really being
transmitted.

Rob

In article .com,
wrote:
Can someone tell me where I might get these. I need one about 75mm OD
and a second about 170mm. I upgraded the motor to my circular saw (the
smoke got out of the old one, and once it's gone they stop working !)
and the new motor has considerably more power which is not really being
transmitted.

Machine Mart ?

http://www.machinemart.co.uk/ranges.asp?g=104&r=2028

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm
[Latest version QSEDBUK 1.10 released 4 April 2005]

wrote:
Can someone tell me where I might get these. I need one about 75mm OD
and a second about 170mm. I upgraded the motor to my circular saw (the
smoke got out of the old one, and once it's gone they stop working !)
and the new motor has considerably more power which is not really being
transmitted.

Rob

youer looking to increase blade speed above what it was? Might not be
wise. Or did you fit the wrong kinda motor?

NT

wrote in message
oups.com...
Can someone tell me where I might get these. I need one about 75mm OD
and a second about 170mm. I upgraded the motor to my circular saw (the
smoke got out of the old one, and once it's gone they stop working !)
and the new motor has considerably more power which is not really being
transmitted.

Rob


an industrial belt and bearing place, local to me would be J and M belts in
grays, essex. every area will have something similar, usually on an
industrial estate

"mrcheerful ." wrote in message
. uk...


SNIP

an industrial belt and bearing place, local to me would be J and M belts
in grays, essex. every area will have something similar, usually on an
industrial estate

Bloody hell that takes me back. Give John my warm regards if he is still
part of the team. He may recall me from the Lytag plant in Tilbury around
1980.

John

No I'm well aware of blade speed - the machine was always underpowered
with the motor it had and when it failed I landed lucky with a much
bigger one which wasn't too difficult to fit, but I feel the power
isn't being successfully passed to the blade and the best way seems to
double up on the belt. The machine is probably overpowered now but it
doesn't get heavily used so that's acceptable, and if it does fail well
I've had 30 years out it !!

Rob

wrote in message
ups.com...
No I'm well aware of blade speed - the machine was always underpowered
with the motor it had and when it failed I landed lucky with a much
bigger one which wasn't too difficult to fit, but I feel the power
isn't being successfully passed to the blade and the best way seems to
double up on the belt. The machine is probably overpowered now but it
doesn't get heavily used so that's acceptable, and if it does fail well
I've had 30 years out it !!


So you are thinking the belt slips? can't see how else the power can 'fail
to reach the blade'.

Have you looked into 'link belts'? Most of the US crowd swear by them for
their table saws - less vibration, longer life.

wrote:
No I'm well aware of blade speed - the machine was always underpowered
with the motor it had and when it failed I landed lucky with a much
bigger one which wasn't too difficult to fit, but I feel the power
isn't being successfully passed to the blade

this tells us almost nothing. We can only help if you explain the
problem.


and the best way seems to
double up on the belt.

to what?


NT

wrote:
Can someone tell me where I might get these. I need one about 75mm OD
and a second about 170mm. I upgraded the motor to my circular saw (the
smoke got out of the old one, and once it's gone they stop working !)
and the new motor has considerably more power which is not really being
transmitted.

Rob


If your in Yorkshire try Doncaster Bearings on Wheatley hall rd and ask
for ged the speed that he worked out pulley diameters for speed
conversion always impressed me.

Oh come on - I've actually given you too much information as all I
really need is a good source of pulleys. With all due respect you've
gone beyond the original question and if I've decided that I want to
use 2 belts then it's the materials for that that I want not someone
questioning my decision. If I had asked for guidance on the design
then fair enough challenge what I'm doing but I didn't seek that.

wrote in message
oups.com...
Oh come on - I've actually given you too much information as all I
really need is a good source of pulleys. With all due respect you've
gone beyond the original question and if I've decided that I want to
use 2 belts then it's the materials for that that I want not someone
questioning my decision. If I had asked for guidance on the design
then fair enough challenge what I'm doing but I didn't seek that.


Oh right, sorry. In that case, no.

In a more helpful vein, a single belt works fine commercially for saws up to
2HP/1500W (induction motor watts, not crappy universal watts ;-), up to
triple belts for 5+HP. How big is the new motor?

You still haven't said *why* you think the power isn't getting to the blade.
It just may be that you could get it going right without *any* changes....

If you wanted a straightforward, simple, tightly focused answer and no
discussion, you're in the wrong place.

On Sun, 10 Jul 2005 21:12:19 GMT, "PC Paul" wrote:

up to triple belts for 5+HP.

Multiple belts are deeply unfashionable these days. I have a triple on
my '60s Wadkin / 3hp motor. It was a damn nuisance recently to get a
near-matching pulley and impossible to get an exact match.

If you walk into a pulley shop and ask for "something to take a few hp"
you're more likely to be given a pair of new polygrooves and a flat
ribbed belt to go with them. These are also more efficient, quieter and
have less vibration.

The rec.woodie Yanks are always banging on about upgrading to link
belts, but as usual for Yank machinery they're fixing the problems of
the '40s with the technology of the '60s.

wrote:

Oh come on - I've actually given you too much information as all I
really need is a good source of pulleys. With all due respect you've
gone beyond the original question and if I've decided that I want to
use 2 belts then it's the materials for that that I want not someone
questioning my decision. If I had asked for guidance on the design
then fair enough challenge what I'm doing but I didn't seek that.

ok, your choice. I wont mention then that I suspect your proposed
solution is unlikely to be a satisfactory one.

If you know what youre doing mechanically, Im sure youre able to find a
supplier of pulleys, snot 'ard.


NT

Having found someone locally in the classic back street who specialises
in belt drives etc. I think I am possibly going to have to eat some
humble pie !! Having seen plenty of machines with multiple belts and
looked up V belt drive design and found that for the size of pulley
(50mm OD) I have the recommended maximum power was 1 kW, then my
thinking was a 75mm pulley and double it up.

The problem I have was that the driven pulley was regularly coming
slack plus the power at the saw blade was not really matching the power
of the motor and there was a lot of heat in the driven pulley. Anyway
I've to give all the data to this local guy and see what he comes up
with - and it may well be something that has been mentioned here, and
....ummm... oops....it could well be that his solution is different from
what I was thinking !!

Rob

wrote in message
oups.com...
Having found someone locally in the classic back street who specialises
in belt drives etc. I think I am possibly going to have to eat some
humble pie !! Having seen plenty of machines with multiple belts and
looked up V belt drive design and found that for the size of pulley
(50mm OD) I have the recommended maximum power was 1 kW, then my
thinking was a 75mm pulley and double it up.

The problem I have was that the driven pulley was regularly coming
slack plus the power at the saw blade was not really matching the power
of the motor and there was a lot of heat in the driven pulley. Anyway
I've to give all the data to this local guy and see what he comes up
with - and it may well be something that has been mentioned here, and
...ummm... oops....it could well be that his solution is different from
what I was thinking !!


Thats brave of you!

Let the group know what the result is - may be useful in future if somebody
else comes along....

wrote:

Having found someone locally in the classic back street who specialises
in belt drives etc. I think I am possibly going to have to eat some
humble pie !! Having seen plenty of machines with multiple belts and
looked up V belt drive design and found that for the size of pulley
(50mm OD) I have the recommended maximum power was 1 kW, then my
thinking was a 75mm pulley and double it up.

The problem I have was that the driven pulley was regularly coming
slack plus the power at the saw blade was not really matching the power
of the motor and there was a lot of heat in the driven pulley. Anyway
I've to give all the data to this local guy and see what he comes up
with - and it may well be something that has been mentioned here, and
...ummm... oops....it could well be that his solution is different from
what I was thinking !!

Rob

so its a belt slackness problem? Has the drive changed in any detail
from the original configuration? Are you simply pushing the beast
harder into the workpiece than its capability? Is the belt stretching
during short uses?

To come up with a solution its necessary first to know just what the
problem is, and its still not too clear.

Dont worry bout the pie, we all eat it, just part of learning more.


NT