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Question for you guys that are tech savvy

 

The HF controller provides enough torque to run a router.? It has been reported here in the past that it works.? So you spend $17.99 and give it a try.? If it is not satisfactory, use it for something else.
 

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Hello:

Varying Voltage on an AC motor is very ineffective. It is worse than on DC. For an AC motor a Variable Frequency Drive is a better idea, but is offered mostly for 3 phase motors.

I have a voltage control on my Smithy lathe and at slow speeds it has almost no torque. I did buy the "back gear" pulley set that helps a lot.

Perhaps a better drive would be an Arduino / motor driver / stepping motor. You could program the Arduino to control the speed of the stepping motor and still have full torque.

Carl.

On 7/12/2023 12:54 AM, Keith S. Angus wrote:

Before going too far I'd look at how the motor will fit. The usual DC motors will fit without modifying anything, and they are not expensive. The main reason for using the motor you have is that you have it. It looks a bit big, it has more power than you need, the revs are low for a Unimat, and decent speed control would require an inverter to give variable frequency. I'd go for the usual 24 V DC motor, which can be fitted straight on. You can now get variable voltage power supplies, like the usual 24 V PWM supplies, but with the speed control section built in, thus simplifying the electrics. Can't find a link to one at the moment. Otherwise using separate power supply and variable speed units is not too difficult to deal with. Making a case for it all is the biggest problem.

 

My suggested solution is different.? You already have a motor.? If you are using the Unimat only as a lathe, mount it on board, and hang the motor at the back.? Buy a Harbor Freight router speed control and use that to control the motor.? This has been mentioned in the past here.?
Yes, DC motors operate well on a Unimat.? But you have to buy a motor, a power supply and controller, mount it all and wire it.? With the Harbor Freight controller, you have spent $17.99 and your motor just plugs in.
 

Keith has helped me a lot in the past and understands what he is talking about. I don’t think I would have had the knowledge to carry this out on my own without his help.
My Unimat now purrs like a kitten!
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
 

Before going too far I'd look at how the motor will fit. The usual DC motors will fit without modifying anything, and they are not expensive. The main reason for using the motor you have is that you have it. It looks a bit big, it has more power than you need, the revs are low for a Unimat, and decent speed control would require an inverter to give variable frequency. I'd go for the usual 24 V DC motor, which can be fitted straight on. You can now get variable voltage power supplies, like the usual 24 V PWM supplies, but with the speed control section built in, thus simplifying the electrics. Can't find a link to one at the moment. Otherwise using separate power supply and variable speed units is not too difficult to deal with. Making a case for it all is the biggest problem.
 

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I may be wrong here, but I thought using a DC motor w/power supply makes for easier/better speed control.?

On Jul 11, 2023, at 9:20 PM, David Derjan <Chillin4life187@...> wrote:

My u90 motor finally gave out after many years of use. So while rummaging around I found a spare 1/4 HP. 1750 rpm AC Marathon motor from my old Taig lathe that I was considering hooking up and using with the Db200. My question is regarding using a speed controller with the motor. I found one that seems to fit my needs, would probably work with the motor and was still pretty affordable. I would like to ask if their is anything I should look out for using this combination and If it would work. Here is the motor info and speed controller info.? Do you guys think this would be a good fit? I really would like to run a single belt and have adjustable speed on my little DB200.? Please help.

<Screenshot_20230711_231237_Samsung Internet.jpg><Screenshot_20230710_015423_Samsung Internet.jpg>
David Derjan
 

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My u90 motor finally gave out after many years of use. So while rummaging around I found a spare 1/4 HP. 1750 rpm AC Marathon motor from my old Taig lathe that I was considering hooking up and using with the Db200. My question is regarding using a speed controller with the motor. I found one that seems to fit my needs, would probably work with the motor and was still pretty affordable. I would like to ask if their is anything I should look out for using this combination and If it would work. Here is the motor info and speed controller info.? Do you guys think this would be a good fit? I really would like to run a single belt and have adjustable speed on my little DB200.? Please help.

Screenshot_20230711_231237_Samsung Internet.jpg
Screenshot_20230710_015423_Samsung Internet.jpg

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