[[email protected]]

I have one of those portable 3 wheel bandsaws. I bought it *used* at an
auction last year. I tested it before I bid, and ran it when I got home,
and it worked fine. I cut a few smallish boards a while back with it,
and its been sitting ever since. Last week I began cutting a piece of
3/4" thick pine. Halfway thru the cut, the motor got real slow, then
stopped entirely.

I tore the whole saw apart, and found the motor was dead. I proceeded to
tear the motor apart and found the windings are fine. The problem is
that the brushes are very tight in their plastic holder. In fact, so
tight I had to use a screwdriver to move them. I removed them and
cleaned both the carbon brushes and the holder with rubbing alcohol to
remove all dirt and any oils.

They are still very tight. So, even if the brush springs are weak, the
brushes need a lot of force to even move them in their slot.

This has me puzzled. Obviously the carbon brushes can not expand. so the
plastic holders must have shrunk. Since the saw was previously working,
this is not because someone put in the wrong size brushes.

My question is how the heck can that plastic have expanded? I thought
that maybe it got hot, but it's smooth, otherwise it would probably be
rough from heat.

The plastic is part of the motor housing, not slide in pieces. Obviously
poorly designed. A quality motor would have brass brush holders. The saw
is a Springfield Cast 12" bandsaw - model 20412. (There is also a
Duracraft 20412 .... identical saw). But it appears from all my
googling, that this saw does not have anyplace to buy parts. (Both
companies must be out of business).

I'm left with either filing the carbon brushes thinner, or filing the
plastic slot wider (or both). But I still can not understand how these
brushes once fit, and are now too tight? The motor is part of the saw
itself, not an external belt driven motor, so if filing it dont work,
the whole saw is junk, since parts are not available.


---
Copyright © 2016 Painted Cow, Inc. - All text, images, and other content
of this message are the copyrighted material of Painted Cow, Inc. unless
otherwise noted. Any reproduction or use of this material is forbidden
without the written consent of the owner.

Websites (such as Homeownershub) who reproduce these messages without
permission, WILL BE PROSECUTED!



/) (\
.-._((,~~.))_.-,
`-. @ @ ,-'
/ ,o--o. \
( ( .__. ) )
) `----' (
/ \
/ \
/ \

PAINTED COW

[[email protected]]

On Sun, 30 Oct 2016 14:56:40 -0500, wrote:

I have one of those portable 3 wheel bandsaws. I bought it *used* at an
auction last year. I tested it before I bid, and ran it when I got home,
and it worked fine. I cut a few smallish boards a while back with it,
and its been sitting ever since. Last week I began cutting a piece of
3/4" thick pine. Halfway thru the cut, the motor got real slow, then
stopped entirely.

I tore the whole saw apart, and found the motor was dead. I proceeded to
tear the motor apart and found the windings are fine. The problem is
that the brushes are very tight in their plastic holder. In fact, so
tight I had to use a screwdriver to move them. I removed them and
cleaned both the carbon brushes and the holder with rubbing alcohol to
remove all dirt and any oils.

They are still very tight. So, even if the brush springs are weak, the
brushes need a lot of force to even move them in their slot.

This has me puzzled. Obviously the carbon brushes can not expand. so the
plastic holders must have shrunk. Since the saw was previously working,
this is not because someone put in the wrong size brushes.

My question is how the heck can that plastic have expanded? I thought
that maybe it got hot, but it's smooth, otherwise it would probably be
rough from heat.

The plastic is part of the motor housing, not slide in pieces. Obviously
poorly designed. A quality motor would have brass brush holders. The saw
is a Springfield Cast 12" bandsaw - model 20412. (There is also a
Duracraft 20412 .... identical saw). But it appears from all my
googling, that this saw does not have anyplace to buy parts. (Both
companies must be out of business).

I'm left with either filing the carbon brushes thinner, or filing the
plastic slot wider (or both). But I still can not understand how these
brushes once fit, and are now too tight? The motor is part of the saw
itself, not an external belt driven motor, so if filing it dont work,
the whole saw is junk, since parts are not available.


---
Copyright © 2016 Painted Cow, Inc. - All text, images, and other content
of this message are the copyrighted material of Painted Cow, Inc. unless
otherwise noted. Any reproduction or use of this material is forbidden
without the written consent of the owner.

Websites (such as Homeownershub) who reproduce these messages without
permission, WILL BE PROSECUTED!



/) (\
.-._((,~~.))_.-,
`-. @ @ ,-'
/ ,o--o. \
( ( .__. ) )
) `----' (
/ \
/ \
/ \

PAINTED COW

It is possible they threw brushes at it, they were the wrong size and
it didn't fix anything so they sold it.
Just use some fine sand paper, buff a little off the brushes and try
again.
I find myself doing this when I can't find exactly the right brush and
I am making do from something at Ace