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Forum topic by JimAtLumberjocks posted 04-10-2016 12:08 PM 268 views 0 times favorited 5 replies Add to Favorites Watch
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JimAtLumberjocks

48 posts in 1503 days


04-10-2016 12:08 PM

Topic tags/keywords: question bandsaw refurbishing tip

I have a 110v 1/2 hp motor that came off an old craftsman bandsaw and I want to use it to drive a diy sharpening system like the one in ShopNotes vol. 18 issue 107 here. The designer intends for the sharpening system to be driven by a drill press, but I want to modify the design slightly so that it has its own motor.

My problem is my bandsaw motor turns at 1750 rpms and I want to slow it down to about 480 rpm. It has been 30 years since I took electric motors in school and I don’t know (1) can my bandsaw motor speed be controlled without damage to the motor, and (2) if it can, what kind of speed controller do I need. I.e. Do I need to vary the voltage, current or both?

Can anyone point me somewhere online where I can get a basic overview of a/c motor control?

Thanks for your comments!

Jim

-- "Are you kidding me?"


5 replies so far

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bigblockyeti

3668 posts in 1186 days


#1 posted 04-10-2016 12:30 PM

The most effective way to reduce the speed of the motor you have would be a belt reduction drive, simple, robust and not too expensive. Motor controllers are available for some induction motors, but can be very expensive.

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JimAtLumberjocks

48 posts in 1503 days


#2 posted 04-10-2016 12:33 PM

Yet


The most effective way to reduce the speed of the motor you have would be a belt reduction drive, simple, robust and not too expensive. Motor controllers are available for some induction motors, but can be very expensive.

- bigblockyeti

Thank you for your reply. What is a belt reduction drive?

Thanks!

Jim

-- "Are you kidding me?"

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bigblockyeti

3668 posts in 1186 days


#3 posted 04-10-2016 12:44 PM

A pair of pulleys, one for the motor you have and one for a shaft you would need to source and a belt between them. You would need a pair of bearings to hold the shaft you need and something to mount the motor and the bearings on.

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JimAtLumberjocks

48 posts in 1503 days


#4 posted 04-10-2016 12:53 PM

Gotcha. Yep. That’s what I thought you meant and yes I believe that will work just fine. I found this site: http://www.blocklayer.com/pulley-belteng.aspx that shows I can achieve the speed I want with a 3” drive pulley, an 11” pulley on the sharpener wheel and a 48” belt. There would need to be 12 inches between shaft centers. Interesting. That may work for me at an acceptable cost.

-- "Are you kidding me?"

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JimAtLumberjocks

48 posts in 1503 days


#5 posted 04-10-2016 12:58 PM



A pair of pulleys, one for the motor you have and one for a shaft you would need to source and a belt between them. You would need a pair of bearings to hold the shaft you need and something to mount the motor and the bearings on.

- bigblockyeti

Gotcha. Yep. That’s what I thought you meant and yes I believe that will work just fine. I found this site: http://www.blocklayer.com/pulley-belteng.aspx that shows I can achieve the speed I want with a 3” drive pulley, an 11” pulley on the sharpener wheel and a 48” belt. There would need to be 12 inches between shaft centers. Interesting. That may work for me at an acceptable cost.

Thanks again for your help.

Jim

-- "Are you kidding me?"

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