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
Machine Mart ?
youer looking to increase blade speed above what it was? Might not be wise. Or did you fit the wrong kinda motor?
NT
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
SNIP
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
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.
this tells us almost nothing. We can only help if you explain the problem.
to what?
NT
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.
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.
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.
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
Thats brave of you!
Let the group know what the result is - may be useful in future if somebody else comes along....
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
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