I have a large wood planner that is factory powered by a 5 hp. electric engine. This engine is a three phase 2890 rpm. It is pretty much 1 to 1 or drive and driven pulleys are the same. I want to power this with a small KUBOTA diesel engine . Most of those engine are running around 2200 rpm. How may horsepower do I need. Right now I have a 11 hp and a 19 hp sitting here but can come up with about anything I need.
- Thread starter jm.
- Start date
Russ from MN
Well-known Member
- Location
- Bemidji MN
I have always heard that you need twice the hp. from an engine that you have from an electric motor, so the 11 hp should do it. You will have to size the sheaves to get the rpm you want.
Steve@Advance
Well-known Member
Typically, when replacing an electric motor with a gas motor, you use a 2x multiplier. Not sure how that applies to diesel though.
Either way, electric motors make full torque through their entire RPM range, where reciprocating engines fall off as they are loaded to the point they slow from full governed RPM.
So, the 2x factor would work out about right using the 11 HP and slightly overdriving the planner to get the right RPM.
Is the planner still under power? If so, check the loaded amps, see if it is maxing out the motor. If it is staying under the FLA, the 11 HP should be fine. If it is going over the FLA, or would be nice to have more power, go with the 19 HP.
Another factor to consider is how much the planner used. Is fuel economy a concern? If not, go with the larger motor.
Also be sure to check the belt drive requirements. Reciprocating engines require a heavier belt arrangement than electric motors.
Either way, electric motors make full torque through their entire RPM range, where reciprocating engines fall off as they are loaded to the point they slow from full governed RPM.
So, the 2x factor would work out about right using the 11 HP and slightly overdriving the planner to get the right RPM.
Is the planner still under power? If so, check the loaded amps, see if it is maxing out the motor. If it is staying under the FLA, the 11 HP should be fine. If it is going over the FLA, or would be nice to have more power, go with the 19 HP.
Another factor to consider is how much the planner used. Is fuel economy a concern? If not, go with the larger motor.
Also be sure to check the belt drive requirements. Reciprocating engines require a heavier belt arrangement than electric motors.
the guy who has sawed a bunch of rough cut basswood and hemlock for me has a circular blade type mill. He has had several power plants in the mill since I have known him. He says every time he figured he had enough HP when gas or electric it was always with a motor that every one else said was too much. He does a nice job sawing. No thick and thin lumber with him always righon the money, and for a reasonable price too
Thanks for all the answers and yes I was planning on over speeding the deal just a little to make up for the rpm loss as the engine takes on the load. Never thought about having to have larger belts but again that will be no problem. Going to give it a try anyway, will let you guys know how it works out.
Stephen Newell
Well-known Member
If it were me I would get a VFD to operate the planer motor on three phase instead of jury rigging it.
Maybe you should ask an electrical engineer, John T. this question, he generally is available on the Farmall and/or John Deere Forum. But my answer would be to use at least a Diesel with 3X the Hp of the original 5 hp electric. In order to get the mfg's suggested Hp from your diesel you generally will have them running at high rpms. It would be nice to have more Hp then needed and have your diesel running at mid rpms, which would be less noise, less ware and tear, less fuel and it would have some extra ponies if needed when the governor opened up under heavy loads.
I would rather have the larger engine running at a little less than full rated rpm and belted up to get the speed than the smaller running wide open all the time with just a small step up in speed to the planer. I don't know the torque curves of your engines though. In general though I like a larger engine running at say 2/3 or 3/4 speed/throttle/load better than a smaller one at full load and rpm.
My dad had a really big one. It was green and It was not a JET but something like it. It was 240 volt and took everything the power lines could run when doing full size planks
. NOW having worked with Emglo air compressors for several years, here is the ratio. The twin piston "F" pumps at 6.5cfm used 5hp gas and 1.5 electric. The bigger "G" pumps used 8hp Hondas or 3hp electric. These pumps put out 13cfm +.
. NOW having worked with Emglo air compressors for several years, here is the ratio. The twin piston "F" pumps at 6.5cfm used 5hp gas and 1.5 electric. The bigger "G" pumps used 8hp Hondas or 3hp electric. These pumps put out 13cfm +.
gtractorfan
Well-known Member
Years ago my dad bought a large (very heavy) planner at an amish auction. It had an almost new v-twin cylinder 18 horse Briggs. With more power you can do heavier cuts.
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