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 Post subject: Some input needed plz
PostPosted: Thu Aug 02, 2018 9:47 pm 
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Hi guys.
So, what you see in the attached pic, is a profile bender. Yes, it is self made. Works 100%. Arches up to 38mm square tubing of 1.6 thick. Very durable and sturdy.
My next step, is to ad a motor, with reverse action.

Now, i have a motor 230v AC, with reverse, that i harvested from a treadmill. It set the incline of the track up or down.
It has a slow speed. Slow enough for what i need to do with it. My question is, "WHAT AND HOW DO I CONNECT TO THE MOTOR TO CONTROL THE DIRECTION OF MOTION, THAT I CAN FIND IN ANY STORE?
Sure, there are many good options, but pricey. Im looking for ideas to make my own control panel. What are the key items i may need?

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PostPosted: Thu Aug 02, 2018 11:07 pm 
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What connections does the motor have? Two wire or more?

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PostPosted: Fri Aug 03, 2018 1:33 am 
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3, im sure. Needs the 12mfu cap though. It can go both ways, but without a controller, its useless
kellys_eye wrote:
What connections does the motor have? Two wire or more?


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PostPosted: Fri Aug 03, 2018 9:04 am 
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A simple motor reversing switch is all that's required then.

https://www.ebay.co.uk/itm/220V-380V-Au ... Swi8VZWzZZ

you can also purchase this type of thing ready-mounted in a box with the appropriate glands and knob (see RS Components and/or Farnell etc for examples) or chose your own version of box/mounting etc.

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PostPosted: Fri Aug 03, 2018 11:54 pm 
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Thanks. Will keep an eye out
kellys_eye wrote:
A simple motor reversing switch is all that's required then.

https://www.ebay.co.uk/itm/220V-380V-Au ... Swi8VZWzZZ

you can also purchase this type of thing ready-mounted in a box with the appropriate glands and knob (see RS Components and/or Farnell etc for examples) or chose your own version of box/mounting etc.


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PostPosted: Sat Aug 04, 2018 12:00 am 
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a motors is no good without a transmission to convert the say 2000rpm to usable power
in other words hydralic or gearing to convert speed to power

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PostPosted: Sat Aug 04, 2018 2:35 pm 
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I was thinking of using a bigger pulley/sprocket than what is on the motor, to slow the ratio down
big-all wrote:
a motors is no good without a transmission to convert the say 2000rpm to usable power
in other words hydralic or gearing to convert speed to power


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PostPosted: Sat Aug 04, 2018 2:36 pm 
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It does not need much power conversion. That force gets controlled by the press im using.
big-all wrote:
a motors is no good without a transmission to convert the say 2000rpm to usable power
in other words hydralic or gearing to convert speed to power


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PostPosted: Sat Aug 04, 2018 3:18 pm 
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i suspect you will need a reduction off many tens perhaps 50-1 ratio
or is this just to move it along the rack rather than replace the jack :dunno:

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PostPosted: Sat Aug 04, 2018 3:38 pm 
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The only thing is that you say this is a motor for adjusting the incline? What's the power rating?
I'd have thought that such a motor was probably only fractional HP.
Looking online, it appears that similarly sized commercial roller benders use a 1.5 HP motor as the drive motor.
Obviously that would be considerably geared down. Apart from increasing the torque it has to be fairly slow to be controllable.


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PostPosted: Tue Aug 07, 2018 7:14 pm 
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Dave54 wrote:
Obviously that would be considerably geared down. Apart from increasing the torque it has to be fairly slow to be controllable.

The other thing about commercial motors used in low speed applications is that they often have 4-poles, giving an output shaft speed of 1500rpm. These slow speed motors generate more torque than equivalent 2-pole motors and because they are designed to operate at such low speeds they generally are much longer lived than the 2-pole equivalent motors

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For this message the author Job and Knock has received gratitude : Dave54
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PostPosted: Tue Aug 07, 2018 7:28 pm 
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Job and Knock wrote:
Dave54 wrote:
Obviously that would be considerably geared down. Apart from increasing the torque it has to be fairly slow to be controllable.

The other thing about commercial motors used in low speed applications is that they often have 4-poles, giving an output shaft speed of 1500rpm. These slow speed motors generate more torque than equivalent 2-pole motors and because they are designed to operate at such low speeds they generally are much longer lived than the 2-pole equivalent motors


You're right of course J & K, and that's the type of motor I'd choose, assuming there's no 3ph available. Even so I wonder if you'd run into problems with the number of reversing start / stops needed. You'd probably need DC injection braking as well. You'd want to avoid "plugging" or braking by reverse running.
I don't know much about treadmills, but I'd assume that the incline adjustment motor is probably a very small DC motor. Looking online it looks as if they are.


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