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A Trick For Varying Speed on Machines

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John

03-31-2002 05:04:29




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A few years ago, I spotted a discarded exercise tread mill on the side of the road on my way to work. Brought it home with the idea that maybe I could use something from it on my never ending list of projects.(Ive been in the machinists trade for 40 years). I found that it had a DC motor and being a tread mill, had adjustable speed. I have a 12" band saw that my dad had pulled from a salvage yard about 40 years ago. He had rigged it up with a maze of belts, pullys, and jack shafts to slow it down for cutting metal. I left one jack shaft in place and mounted the small 1hp tread mill motor on the saw. I just put the needed controls from the tread mill in a box on the saw. The whole system works like a charm. I can go from "0" to whatever speed I need with a turn of a knob. The more strain that is put on the blade, the more the motor compensates to maintain the feet per minute of the blade. I would like to put a unit like this on one of my drill presses, but that is another project on my list. Don`t know if anyone else has ever used this idea on a machine, but it sure is a sweet setup. I understand that most of the later tread mills are 2 and 3 hp, which gives me an idea for my lathe. By the way, these motors run at 8 to 9 thousand RPM when running flat out. Most old tread mills can be bought cheap and also found in junk yards.

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AL 2

04-02-2002 04:07:49




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 Re: A Trick For Varying Speed on Machines in reply to John, 03-31-2002 05:04:29  
A fellow I know made his bench drill press variable speed by using a DC motor and a reostat. It works good. I think you need about the same size and speed motor as the original but could be wrong about that. In Canada you can sometimes find these motors at Princess Auto. It's been on my to to do list for a few years.



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Tom

03-31-2002 11:56:01




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 Re: A Trick For Varying Speed on Machines in reply to John, 03-31-2002 05:04:29  
Now I am going to have to look for these things on trash day along with other things. And have more stuff and projects around half (or not even started) done. Thanks though, good tip.



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BFO

03-31-2002 05:13:59




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 Re: A Trick For Varying Speed on Machines in reply to John, 03-31-2002 05:04:29  
Ellis makes a few DC drive drill presses. I've been trying to convince myself for years to get one. Follow the links to drills/tapping machines.



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Mike W

03-31-2002 19:30:05




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 Re: Re: A Trick For Varying Speed on Machines in reply to BFO, 03-31-2002 05:13:59  
I read somewhere that the treadmill HP specs are assuming very intermittent duty. Do some research before you spend a lot of time hooking one up.



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Tom

04-01-2002 17:14:04




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 Re: Re: Re: A Trick For Varying Speed on Machines in reply to Mike W, 03-31-2002 19:30:05  
But what if you took a "one hour walk"? This isn't intermitant. Most of my machines don't run for an hour at a time before I switch themoff for some reason.



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John

04-01-2002 02:54:22




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 Re: Re: Re: A Trick For Varying Speed on Machines in reply to Mike W, 03-31-2002 19:30:05  
When I was in re-hab after my heart surgery,the tread mills never stopped in a 2 hour session except to switch people. This went on all day, 6 days a week. I have been useing my band saw for 5 years now with this setup on it. Works great.



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Mike W

04-01-2002 19:33:01




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 Re: Re: Re: Re: A Trick For Varying Speed on Machines in reply to John, 04-01-2002 02:54:22  
Hi guys, I will try to find one of these motors for myself based on your results. I did find the following info.

A 2.5 HP treadmill duty motor is rated at 1.5 HP continuous duty if it is equipped with a cooling fan. Some motors do not have a fan; but one can be installed.

The small size makes it difficult to dissipate heat. If it runs hot for too long, it can weaken the field magnets.



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