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Delta 46-250 (LA200) midi-lathe powered by variable speed treadmill motor?

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Forum topic by BobBlarney posted 04-12-2016 08:08 PM 379 views 0 times favorited 1 reply Add to Favorites Watch
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BobBlarney

3 posts in 601 days


04-12-2016 08:08 PM

Topic tags/keywords: delta 46-250 lathe la200 lathe polybelt microgroove pulley treadmill variable speed motor

Hello,

I’ve a chassis from a Weslo treadmill (formerly used as a clothes rack). It has a variable speed (0-5600rpm max.) 2HP permanent magnet DC motor. I had intended to convert the chassis into a widebody sander, with a 3-4” drum turned on my lathe.

When I disassembled the chassis I noticed that it has a micro-groove pulley/belt drive similar to the drive on the lathe. It would be very nice to eliminate belt pulley changes, as well as have variable speed. It so happens that the belt from the lathe fits the treadmill pulleys, but the treadmill pulleys have 9 grooves instead of 3 grooves. (The treadmill belt uses 8 of the 9 grooves, btw.)

So, my questions are:

1. Is the DC motor suitable for driving the lathe? As I recall, DC motors develop maximum torque when stalled, and minimal torque at maximum speed. I don’t anticipate running the lathe > ~3800 RPM (spindle speed).

2. Is a 3-groove belt sufficient to handle the power? When properly aligned and tensioned, I don’t think that the 3-groove belt would jump off the 9-groove pulley, but is that a reasonable assumption?


1 reply so far

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Rick M

7923 posts in 1845 days


#1 posted 04-12-2016 11:38 PM

Yes, and I don’t know.

I use a treadmill motor but mine uses a v-belt. Many people switch the flat belt pulley to a V, I’m told they just screw on and if you run the motor in reverse it will come right off.

And if you have a separate PWM (MC60) you can ditch most of the electronics.

-- http://thewoodknack.blogspot.com/

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