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Motor for generator

R

rlp in Co.

Well-known Member
Crazy idea. I have a generator that is good but the motor is bad. I also have a new 6 HP harbor freight motor that I bought for another project that has been setting for a long time. The crank is about3/4 inch too short.I. was thinking that I could weld a short bolt on the end of the crankshaft and then turn a taper on the end and tap the end for a 5/16 inch bolt.

I kmow someone will say, just go buy a new motor, well, show me where!
 
IF the crankshaft will NOT fit into the taper , or only goes in a short distance, you are already in business. Just turn a taper on the crankshaft until it goes on as far as you need. Do not be concerned about using up the whole taper, you need only enough to make it run true and be secure. On the other hand, if the crankshaft is too small, make a tight fitting bushing with a closed end , drill and tap the crankshaft if it isnt already, and secure this bushing with a bolt. Then turn in the normal manner til you get the taper you need.
 
Purchase the taper that fits, nd a coupling designed for a gas engine. this removes all alignment error and ads life to both components. Jim
example
 
Being it's your motor and generator, and you are willing to take the gamble, go for it!

Just be aware that is a very precise fit to center the armature inside the field without it dragging, or having balance issues. The length to set the other armature bearing in the right place is also critical.

What about the face of the motor where the generator case bolts up, is that there?
 
If the generator depends on the engine for a main bearing, get the correct engine. There will be really bad vibration. If there are two frame bearings on the gen, my coupling idea deserves a look. Jim
 
I think your idea might work! The taper on the original motor is about a inch long, but my new engine's shaft is about a half inch short, so if I taper the shaft in my lathe it would only taper a half inch on the end. The new motor is already tapped in the end for a bolt. The generator has a keyway so that would hold the torque. I think your idea will work! Thanks! I was going to weld a half inch onto the shaft.
 
The mounting bolt holes seem to be the same for different brands of engines.
If I measure everything right and get the taper right it should work. But that's a big if! Ha!
 
(quoted from post at 00:54:09 07/20/21) Thanks,that's a great price but ten HP is
too big and it's a flat head that would use
a lot more gas.
Click to expand...

How many hundreds of hours of use per year are you planning to use this generator ?
If you want fuel sipping efficiency , use an inverter generator .
 
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