Variable speed Dremel tool model 380-5, runs backwards. I believe that
sometime in the past I have taken it apart (I forget why) so did I
rearrange something?

(It's a good thing I'm not a heart surgeon.)

Henry

Henry wrote:

Variable speed Dremel tool model 380-5, runs backwards. I believe that
sometime in the past I have taken it apart (I forget why) so did I
rearrange something?

(It's a good thing I'm not a heart surgeon.)

Henry

You probably reversed the leads going to the two commutator brushes.
Take it apart again and see if you can swap them.

That's how you reverse a "universal" motor, which is what's in a Dremel.

It could also have happened if you removed the stator and somehow
managed to replace it flipped end for end without disconnecting the
leads going to it, but that's a very slim possibility.

HTH,

Jeff

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

Jeff Wisnia wrote:

Henry wrote:

Variable speed Dremel tool model 380-5, runs backwards. I believe
that sometime in the past I have taken it apart (I forget why) so did
I rearrange something?

(It's a good thing I'm not a heart surgeon.)

Henry


You probably reversed the leads going to the two commutator brushes.
Take it apart again and see if you can swap them.

That's how you reverse a "universal" motor, which is what's in a Dremel.

It could also have happened if you removed the stator and somehow
managed to replace it flipped end for end without disconnecting the
leads going to it, but that's a very slim possibility.

HTH,

Jeff


Thanks to Jeff for solution. I opened it up, saw that there was no way
I could have reversed the leads, so tried flipping stator end for end.
BINGO!

Henry

Henry wrote:
Jeff Wisnia wrote:

Thanks to Jeff for solution. I opened it up, saw that there was no
way I could have reversed the leads, so tried flipping stator end for
end. BINGO!

Henry

I've always thought they should run the other direction anyway. When doing most
things right-handed the normal rotation throws the debris right back at the
operator (especially fun when using those fragile cutting wheels).

Rick Brandt wrote:
Henry wrote:

Jeff Wisnia wrote:


Thanks to Jeff for solution. I opened it up, saw that there was no
way I could have reversed the leads, so tried flipping stator end for
end. BINGO!

Henry


I've always thought they should run the other direction anyway. When doing most
things right-handed the normal rotation throws the debris right back at the
operator (especially fun when using those fragile cutting wheels).



Yeah, that's fine for stones and cutting wheels, but whereya gonna find
left hand cutting burrs, and very small LH drill bits are near
impossible to find and sky high in cost if you do.

Just wear some kind of glasses to protect your eyes. :-)

Jeff (Happily doing his silly "toldjaso dance" for Henry...The dance he
stole from a "Will and Grace" TV episode.)

Jeff


--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

"Jeff Wisnia" wrote


Jeff (Happily doing his silly "toldjaso dance" for Henry...The dance he
stole from a "Will and Grace" TV episode.)

Jeff

Anything like the Pee Pee dance???

(sorry. Don't watch much TV let alone Will & Grace....)