Band saw re-hab

[rmack898]

Before putting my new to me band saw in service, I decided to go through it and clean it up a bit. It was fully functional before I tore into it, but I'm glad I took it apart because it does need a little updating.

I was just going to sand down the ugly green and give some fresh rattle can but everythingcame off too easy so it all went to bare metal.

I don't know how old this saw is but I haven't seen wire like this in a long time. I'm thinking it must be from the '50s or early '60s. There is a schematic on the box cover and it was not wired as built, someone from the Bumfuk Polytechnical Institute of engineering was in there. I will replace all the wiring and wire it per the schematic.

I do have a question that I hope someone can answer. The machine is all 110v and it has a step up x-former to 220v for the blade welder, everything else is 110v. Why would they use a 2-pole switch for the motor? The cordset comes into the box and is grounded there, the drive motor and the grinder motor have just a hot and neutral going to them. Is that the way they did it back then? It would take less wire if I used a single pole switch. What do you think?

I don't know if you can see it in the last pic but it has a belt driven air pump that gets plumbed to a nozzle to blow the chips away from the cut line. I had never seen that efore and thought it was pretty cool. Somewhere along the line someone changed the sheeve on the drive motor and eliminated the air pump belt but I rolled the pump over and it works so I will have to come up with a new sheeve to drive it.

[TommyA]

Aw hell now you've gone and done it. Didn't you see the greasy spot that was left when LuDan47 went to repair the rear final drive on a crawler? That was all that was left. Well, might as well make the best of it and start the rebuild to like new condition. Just keep the camera handy.

[getatorch]

Yea, pics. must follow!

[precisionworks]

Why would they use a 2-pole switch for the motor?

My best guess is that one side of the switch is wired to the motor, the other side is wired for the grinder -- that way, one switch controls both circuits, while keeping both electrically isolated from each other.

it has a belt driven air pump that gets plumbed to a nozzle

Exactly the method used on the old (1950's) Delta/Milwaukee deep throat scroll saw.

Your saw appears to be almost the exact model Do All we had at the machine shop. Tough as shoe leather, nearly impossible to wear out in one lifetime. Ours was 3-phase, variable speed.

[rmack898]

Originally Posted by precisionworks

My best guess is that one side of the switch is wired to the motor, the other side is wired for the grinder -- that way, one switch controls both circuits, while keeping both electrically isolated from each other.

Nope, the grinder is powered from the junction box on it's own circuit and switch. A hot and neutral go straight from the juntion box to the switch and from the switch to the motor. I've just never seen it done like this before so I figured there must be a reason.

[Charlie C]

There is a reason for wiring it like that but for all the good it is doing I can't think of the reason. As I remember it had something to do with feed back in the event that a short developed but I am not sure.

[Uncle Buck]

Tell ya what, I will give you $100 for it the way it stands and relieve you of the headache of figuring out that wiring problem. Fair nuff? :evil:

[randydupree]

hey UB,just jump right in!
hahaaa!!

[Uncle Buck]

Originally Posted by randydupree

hey UB,just jump right in!
hahaaa!!

Ah what can I say eh...............................a legend in my own mind and all that rot! (ya gotta have a great sense of humor)

BTW I would give my eye teeth to have that sucker in my shop!

[pawtech0]

looks like maybe it was set up to be 220 if you wanted it to be maybe reason for that switch.