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Band saw conversion

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Clive Farrar04/12/2010 09:04:05
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125 forum posts
41 photos
Hi Robert,
                   I have had a look at our works machine and I see what you mean about the small pulley.  I was surprised to find that the drive pulley is just a single flat flange.
 
Using wonderfull excel the standard speeds check out and so with the standard drive pully the lowest speed I think you can get on this machine is 267 m / minute and that would be by building up the band drive flange to 320 mm OD , i.e. the same is the tyred band drive wheel. There is probably not that much adjustment on the motor mount.
 
To get to the speed you want from the standard motor pulley would need a 2 m diamater on the band drive flange.  err NO!
So if you turn that on its head you could look to make a smaller tyred drive wheel but to get down to 83 m /min would need the drive flange at 320mm  and the tyre drive band at 100 mm dia, which is too small the blade would fatigue too quickly.
 
So I would say you either have to reduce the motor speed or accept that you can not cut metal at your desired speed on this machine and take one of the alternative routes suggested.
 
regards Clive
Anthony Ashgrove04/12/2010 17:35:47
9 forum posts
Hi Robert,
Not see your machine, so don't really know what I'm talking about, so take this reply accordingly, Can you remove the motor and replace it with a counter shaft then drive this shaft via a redution pulley from your motor suitable mounted. Or is it possible to fasten a large pulley, such as the ones on the washing machine drum drive on the large saw pulley? As I said I have no idea what I'm talking about!!.
Good luck
Tony Ashgrove
Speedy Builder505/12/2010 07:38:42
2878 forum posts
248 photos
All good stuff and thanks for your thoughts.  I did wonder if anyone had experience of using the speed controlled wasing machine motors, which part of the electrics is used for the motor,  and how much power these motors generate ?
 
There are plenty about as the ladies do like a new machine well before the motor gives up.
 
Back in the 70s, I made several saw benches up from washing m/c motors (and no electric control).  I just kept connecting the jumble of wires up until I got the right speed  and direction.
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