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How to Replace a Motor??

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Forum topic by ChrisCrafts posted 940 days ago 1368 views 0 times favorited 8 replies Add to Favorites Watch
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ChrisCrafts

105 posts in 1191 days


940 days ago

Topic tags/keywords: bandsaw

I want to swap out motors on the 20” Delta Bandsaw I just acquired. It currently has a 1.5HP 3 Phase Baldor motor connected to a Leeson VFD. Only problem is, once I set it up with a Static Phase Converter I am going to lose 1/3-1/2 of the HP. It will be much cheaper to swap out motors than to buy a rotary phase converter, I think.

I need a tutorial in motors though. How do I figure out what type motor will work with my Bandsaw. I have no idea how to identify mount size, speed, and shaft size. I mean I am a guy so I am not going to be a good judge of Shaft Size. tee hee

Any pointers or links on motors would be greatly appreciated.

Thanks!

Chris

-- Chris, Washington The State! http://www.chris-crafts.com


8 replies so far

View Loren's profile

Loren

7284 posts in 2254 days


#1 posted 940 days ago

Any capacitor start motor should work. If you get one that runs
the same speed, you can use the same pulley off the 3 phase motor.

I have a vintage 20” Delta saw which I switched to single phase.
I found a 2HP motor and had the pulley bored out to fit the
shaft on the motor.

I may be confused, but doesn’t a VFD remove the need to use
a phase converter? You may already be good to go on single
phase power.

I wouldn’t worry too much about power loss. The old motors
rated at 1.5 HP were overbuilt with heavier windings by today’s
standards. They had more power.

-- http://lawoodworking.com

View buffalosean's profile

buffalosean

174 posts in 1993 days


#2 posted 940 days ago

If you want a good american motor, e-mail leeson or baldor ask them to set you up with a local distributor. from there your local guys will walk you threw what you need. I just did it myself.

You can also call delta and ask them about a replacement single phase motor. ask them what the frame, shaft size, etc.

If your going to run multiple 3 phase machines you might be better off getting a large rotary phase converter.

good luck

-- There are many ways to skin a cat...... but, the butter knife is not recommended

View ChrisCrafts's profile

ChrisCrafts

105 posts in 1191 days


#3 posted 940 days ago

When I saw the VFD I was hoping it would work with 1 Phase power as well. But it is 3 Phase in 3 Phase out. I will call Leeson to double check but it says pretty clearly that it’s for 3 Phase.

I bought static convertor that should be here soon. I guess I will see how it goes.

-- Chris, Washington The State! http://www.chris-crafts.com

View ChrisCrafts's profile

ChrisCrafts

105 posts in 1191 days


#4 posted 940 days ago

Hmmmm, maybe I can just swap out the Leeson VFD, that would be the best option.

-- Chris, Washington The State! http://www.chris-crafts.com

View Loren's profile

Loren

7284 posts in 2254 days


#5 posted 939 days ago

A new motor is not a cheap upgrade. That’s why I collect
used motors to keep on hand. In your area there may be
farms selling (what else?) farm duty motors they aren’t using.
These motors work great for woodworking machines.

-- http://lawoodworking.com

View Don W's profile

Don W

14676 posts in 1173 days


#6 posted 939 days ago

The main thing is be sure the rpm’s are the same or close. Typically they will be in the 1400 or 3450 range (numbers may be off a little but you get the idea).

The second thing is the bolt hole spacing. This can usually be fixed by re-drilling or making a new mount, but if you don’t want to do that, make sure the bolt holes will fit.

I agree with Loren. I will buy a used piece of crap equipment if the motor works well, just for the motor. You will find you can probably find a used piece of equipment with a good motor cheaper than buying just the motor.

You already know about single versus 3 phase and hp, so that’s about it of what I can think of.

-- Master hand plane hoarder. - http://timetestedtools.com

View ChrisCrafts's profile

ChrisCrafts

105 posts in 1191 days


#7 posted 939 days ago

Wow! Thanks cr1!!! I am gonna jump all over one of those Surplus Baldor 5HP Single phase motors. I can probably sell the existing motor to pay for part of it. That or I will re-purpose it to refurb a machine off CL. Plenty of bargain machines with seized motors out there.

-- Chris, Washington The State! http://www.chris-crafts.com

View MedicKen's profile

MedicKen

1599 posts in 2068 days


#8 posted 939 days ago

You shouldnt need to use the static converter with the VFD. The VFD should convert single to 3 phase for you

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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