Bench testing
 

Hi all,
I have looked at the wiring schematic for testing
and my question is what happens to the energy
being generated by the S/G ? I need to test this
301 but I don't want to damage my S/G

Thanks
Terry

Nothing. If it's not hooked up, it's just not hooked up. NBD. Just like a wall outlet with nothing plugged in.

For running an engine "on the bench" you need hot battery/boost box, clamp the pos cable to the "A" terminal on the S/G and run a jumper wire to the pos side of the coil, clamp the neg cable to the engine somewhere (the rear S/G mounting bolt works pretty well).

If you don't have a switch of some sort, your S/G will immediately start turning the engine over when you hook the neg cable up.

Once your engine starts, remove the clamp from the "A" terminal. To kill the engine, remove the jumper wire from the pos side of the coil.

Technically I don't think the S/G is actually "making" electricity unless the "F" terminal is grounded. Don't ground the "F" terminal for very long at a time, you can burn the field windings out.

Be careful and good luck.

Bench testing
 

Thanks for the quick answers. The reason I asked is that
my cnc mills have a large resistor to get rid of the energy
that the spindle makes while slowing down so I didn't know
about the energy from the s/g when it was not hooked up to something
Obviously I am not an electrical engineer. Thanks again

Terry

I assume you might be a CNC machinist of some sort. That large resistor is to help the motor controller "brake" to quickly stop the spindle. Some machines have it some do not.

Bench testing
 

Yes a machinist of sorts. I own two hurcos mills and two
Hardinge lathes. I see the haas logo on your posts. I've never
owned one but they seem reasonably priced. I do have one
of their indexers

Terry

Hurco was the first mill I learned on. Great conversational programming. Hardinge lathes are top notch. Show us some pictures of your shop. We all like pictures on here. Cub pictures to. Never enough of those. :beerchug:

X2 :beerchug:

Bench Testing
 

Ok I will start with the pic of my 149 that
I hope to start on after my 129. In this picture of
my air compressor room there is a machine
in the corner. Can you tell what it is? I'm
semi- retired so I have accumulated a few
things you wouldn't normally see in a modern
machine shop. I'll tell you in the next post if
you can't guess it

I don't know why that pic turned sideways
it wasn't when I took it
Sorry
The machine is a sinker EDM. There was no prize
for a correct guess. For anyone reading that's not
A tool maker a sinker uses an electrode
to "burn" away metal. You machine the electrode
to whatever shape you want. So let's say you
you want a hex on the ID of a shaft one inch deep
this would be the machine you could use.

Terry