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3 phase or not ?????????????????????

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Forum topic by Shawn Masterson posted 569 days ago 541 views 0 times favorited 9 replies Add to Favorites Watch
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Shawn Masterson

1253 posts in 581 days


569 days ago

Topic tags/keywords: motor planer 3 phase jet single phase

I just bought a used planer for $675. It is a 20” JET knock off in fair condition. it has a 5 HP 3 phase motor (3450 rpm)with a static phase converter. In it’s current setup it is only running at 2/3 power according to the spec sheet. It need all 5 HP, maybe more. I was thinking of using a 5 HP(1725 rpm) single phase that I have and using a large pulley to get it up to speed, but I have heard that doing that you torque. I was just looking for input on what you guys Know. I was thinking of doing a blog of it as I clean it up and make the needed changes.


9 replies so far

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mbs

1435 posts in 1573 days


#1 posted 569 days ago

why would you have to use a pulley to get the 1 ph up to speed? Doesn’t it have a start capacitor?

-- Sorry the reply is so long. I didn't have time to write a short reply.

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Grandpa

3098 posts in 1308 days


#2 posted 569 days ago

why would you have to use a pulley to get the 1 ph up to speed? Doesn’t it have a start capacitor?

I believe he means to get the cutter head to the same speed using the 1725 rpm motor as the 3450 (3 phase) rpm motor turned it. Yes you could do that but you are correct when you say you would be losing something. You lose your power when you change pulley sizes and it will never cut right at the lower speed. It will make rough cuts or you will have to feed the stock at a very slow rate. You will not be happy with it. I can’t believe you need more than 2/3 or the 5 hp. You would have over 3 hp. that is a lot but maybe not for the 20”. That is a big planer. Look for a motor. They are for sale but plane to pay $500 for a new on and you will need to know the frame size so it will mount.

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Shawn Masterson

1253 posts in 581 days


#3 posted 568 days ago

I believe he means to get the cutter head to the same speed using the 1725 rpm motor as the 3450 (3 phase) rpm motor turned it

right that is exactly what I mean. It has a nurlled infeed roller so in softer wood you have to take 1/16” pass to remove the marks. when I am hoging rough lumber I generally take 1/8 to 3/16 a pass with my 12” belsaw. right now I am taking some 9/4×10” x 18’ oak boards down to 1 1/2 for some counter top an 1/8 of an inch is all it wants to cut at 10”wide.

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REO

601 posts in 707 days


#4 posted 568 days ago

a horse is a horse of course! even with a speed up on the drive you will get 5 hp torque at the spindle. I f it is direct coupled now I would be concerned with the overhung load if you drive it with a pulley. the shaft may not be designed to take it properly.

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Grandpa

3098 posts in 1308 days


#5 posted 567 days ago

You really need a 7 1/2 hp 3450 rpm motor in a single phase design. That or a rotary converter. My experience in that was it was going to cost me as much as a new motor. You have to have a motor that is the same rpm and hp as the motor you are driving.

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Loren

7430 posts in 2280 days


#6 posted 567 days ago

Using a larger sheave is not likely to be a problem. You
want one with about double the circumference of the
one on the faster motor.

In situations where the faster motor is already using
a large sheave to drive a shaft at 10,000 rpm or more,
going to a slower motor with a larger sheave could
introduce balance issues. A planer cutterhead is
likely set up to run at about 5000 rpm.

-- http://lawoodworking.com

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Shawn Masterson

1253 posts in 581 days


#7 posted 567 days ago

I was going to use the larger pulley but that ment I had to rebuild the motor mount
it looks like I am going to go with a self starting rotary phase converter. My neighbor build motors for a living and said if I got plans with the specifics he would help me in return for a copy of the plans. they were 13.99 with all the details.
I already sourced a 10 HP 3phz motor for 40$ and it is like new.

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REO

601 posts in 707 days


#8 posted 567 days ago

I have been building RPC’s for many years and I have collected quite a pile of information. if others are interested I can put together a file with the information.

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Shawn Masterson

1253 posts in 581 days


#9 posted 567 days ago

I would love that info.

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