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Thread: Machining a groove for a belt
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12th May 2015, 08:31 AM #1Novice
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Machining a groove for a belt
Morning fellas
I have just picked up my new ebay purchase project.
Pretty happy as I love old machinery and this should be perfect for me as I usually only cut smaller RHS etc.
Anyway, she needs a bit of restoration.
Do you think it's worthwhile or necessary to machine a groove for the belt in the larger drive wheel ? It needs new belts all round but was wondering if this would be needed to keep the belt straight and in place, or is it designed like that for a reason?
Let me know what you think.
Matt.
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12th May 2015, 10:35 AM #2Golden Member
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Should be fine as it is. V pulley to flat pulley drives have been around for a long time on small equipment. My father had a compressor with a V to flat pulley drive for about 25 years which never gave any problems.
Frank.
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12th May 2015, 10:37 AM #3Diamond Member
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Its a bit hard to know why that flat belt pulley is there, possibly the original V belt pulley came to grief and the flat pulley was a work around. The saw doesn't look as though it was originally a flat belt drive that has been converted to electric drive, if it has been converted it its certainly been very well done.
Personally I would remove the flat pulley and replace it with a V pulley, there may well not be enough meat in the flat pulley to accommodate a V groove. But try it as is first, it may well work OK.
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12th May 2015, 10:41 AM #4Novice
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Righto. Thanks for the replies. I'll replace the worn belt and give it a run for a while to see how she runs as is before making any modifications.
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12th May 2015, 10:59 AM #5Pink 10EE owner
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12th May 2015, 11:30 AM #6Golden Member
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12th May 2015, 11:35 AM #7Member: Blue and white apron brigade
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I agree.
Lots of flat belt drive machinery (originally driven from a single central motor and a series of shafts and belts reticulating power around a workshop) were produced or converted to run with small a flat belt pulley motor. The big thicknesses from the mens shed is like that.
Should work fine with a new V belt.
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12th May 2015, 11:39 AM #8Novice
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Great. Thanks guys. Can't wait to get it cleaned up and a new blade on her.
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12th May 2015, 12:08 PM #9Most Valued Member
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Nice purchase. Looks well made in it's day.
SimonGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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12th May 2015, 12:25 PM #10Most Valued Member
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That's a dog clutch on the large pulley? I wonder if that's why they have a Vee belt on a flat pulley?
Stuart
p.s. i.e. if the grooves where in a straight line when engaged, it would either try and reengage itself when disengaged and VV
p.p.s. Do flat belts work on pulleys that small? I thought not..... but have no idea why I think thatLast edited by Stustoys; 12th May 2015 at 12:33 PM. Reason: p.s. p.p.s
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12th May 2015, 12:58 PM #11
Is that a Lotze hacksaw? Looks an awful lot like mine (but mine is much dirtier!).
My Lotze has a large flat pulley with the dog clutch and also a smaller V belt pulley on the motor. Works a treat (but slow to cut). There are a few other threads on here about restoring the Lotze and they all seem to have a large flat pulley and small V pulley.
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12th May 2015, 01:02 PM #12Member: Blue and white apron brigade
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The photo shows a combined cutter and feed drive flat belt pulley for a 1925 thicknesser that belongs to the mens shed.
Motor, obviously not original, is a 7.5HP 1440 rpm. I also doubt The pulley (aluminium) is an original.
The larger pulley drives the cutter and the smaller (shiny one) drives a feed roller gearbox.
The cutter shaft has a cast iron pulley about the diameter of the hub between the two pulleys on this photo
The original cast iron spoked pulley on the feed roller gearbox is about the diameter of the bigger one on this photo. and all geared reduction gearbox connected to the feed rollers..
While moving the thicknesser back in January one of the Shed members put the drive roller gear box and pulley on a bench and it rolled off onto the floor smashing all four spokes.
It needed replacing anyway as the pulley hub was cracked - something else to fix up.
I recently purchased a Honeywell 7.5HP VFD to run this puppy. Not that it needs variable speed, I just don't like the idea of FANGING this puppy up to full RPM without some low speed testing.
The thicknesser comes from a deceased estate but was formerly out of of the old SEC state workshops in East Perth. The thicknesses was used to thickness cross beams for power poles.
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12th May 2015, 02:09 PM #13
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12th May 2015, 02:38 PM #14Most Valued Member
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Nearly all the older powered hacksaws I've seen are/were running the flat pulley on top.
Kryn
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12th May 2015, 04:56 PM #15Diamond Member
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I too would think that this is the original setup. The small pulley is grooved for the Vee belt, and the large one is so much larger than the smaller that there is sufficient grip between the pulley and the bottom of the belt that slippage is not an issue. Ajax piston pumps, A2s,A3s etc have the same setup as did lots of small machines back in the day. I doubt that this saw was ever line fed, the electric motor sits underneath and is protected from most muck except perhaps cutting oil/coolant. By all means replace that belt and paint her up pretty, but I think that you would still cut an awful lot of material before the belt fails, - it would probably see most of us out.
Nice saw by the way,
Rob
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