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Tool Talk Discussion Forum

Band saw conversion???

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suptscottyb

10-26-2007 13:44:07

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I have a 14 inch wood cutting band saw. I would like to convert it to a metal cutting saw. Does anyone know what speed it needs to be turning for metal and what kind of cutting (how heavy) can I expect this to do?

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dave guest

10-29-2007 21:12:38

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Real OT kiddie car/jeep/barbie car in reply to suptscottyb, 10-26-2007 13:44:07

Anybody replace those 2 six volt batts with 12 volt utility batt. Batt pack is over $50 and kid runs it on high speed anyway. You have black, white, yellow and blue wires. Need hookup to get it right the first time. Don't know if there's any resistors, but there is a speed control. Could that burn up. Thanks for your help for an old man who is forgetting too much.

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dave guest

10-29-2007 21:12:22

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Real OT kiddie car/jeep/barbie car in reply to suptscottyb, 10-26-2007 13:44:07

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rockyhawaii

10-30-2007 09:53:06

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Re: Real OT kiddie car/jeep/barbie car in reply to dave guest, 10-29-2007 21:12:22

I believe they sell a plug that will convert the batteries, but it is over $20. I'd just opt for the six volt batteries as they are supposedly "stronger."

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36 coupe

10-27-2007 04:11:46

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Re: Band saw conversion??? in reply to suptscottyb, 10-26-2007 13:44:07

You would be better off buying a 4X6 metal cutting band saw.

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MBU

10-26-2007 19:02:38

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Re: Band saw conversion??? in reply to suptscottyb, 10-26-2007 13:44:07

Generally speaking if the saw originally had a 1800 rpm motor than for metal cutting you'll need at least a 25 to 1 reduction.

If you have some electrical savvy than a cheap way to accomplish this reduction is by using a DC motor and its control from a treadmill. One can buy on of these from the Salvation Army or Goodwill stores for about $5.00.

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MarkB_MI

10-26-2007 16:59:48

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Re: Band saw conversion??? in reply to suptscottyb, 10-26-2007 13:44:07

Richard Finch's Welder's Handbook devotes a couple of pages to converting wood bandsaws for metal cutting using jackshafts. Something I've been meaning to do with my 12 inch saw, but haven't yet.

Finch recommends no more than 330 feet per minute for mild steel, 270 fpm for chrome-moly, and 1600 fpm for aluminum. Wood cutting saws run around 2700 fpm, so you can figure out what kind of reduction you need to get it slowed down.

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Gerald J.

10-26-2007 16:14:56

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Re: Band saw conversion??? in reply to suptscottyb, 10-26-2007 13:44:07

Metal blades run best about 100 feet per minute. I added an intermediate jack shaft, probably about the same sized pulleys as the original on my Duer saw. Been cutting steel and aluminum for 25 or so years. The best blades come from a major vendor, locally made ones break for me. Use a blade made for metal, not the ones made for wood.

Gerald J.

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Gene Davis (Ga.)

10-26-2007 14:14:52

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Re: Band saw conversion??? in reply to suptscottyb, 10-26-2007 13:44:07

I casn't quote you an exact speed as metal cutting is usually measured in feet per minute rather than rpm. Why not drop the pulley size down or up enough to slow it about 40% on the saw end and then look into a variable speed setup on the motor end with a crank operated base so you could dial in a speed for different things like plastics or aluminum that may run faster. On a vertical saw I would think that 3/16" thick would be about the limit for steel and 1/4" for non ferrous alloys. That would be determined by the hardness of the metal sawn and the type of blades used.

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suptscottyb

10-26-2007 15:08:45

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Re: Band saw conversion??? in reply to Gene Davis (Ga.), 10-26-2007 14:14:52

Thanks Gene, I read once the exact speed needed but, can't recall it. How much would a reostat for motor cost? where do you find them?

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Bus Driver

10-26-2007 16:04:03

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Re: Band saw conversion??? in reply to suptscottyb, 10-26-2007 15:08:45

The typical motor on a 14" band saw is an induction motor. Trying to control the speed of an induction motor with a rheostat will surely result in the burnout of one or both of the devices. Adapt a treadmill motor.

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