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Band saw, Is 60 cycle hum normal

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Forum topic by MarktheWoodButcher posted 05-20-2009 06:51 PM 916 views 0 times favorited 5 replies Add to Favorites Watch
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MarktheWoodButcher

109 posts in 2762 days


05-20-2009 06:51 PM

I bought a used 28-200 Rockwell band saw. Any time there is power to it (on or off) there is a 60 cycle hum from the circuit/switch box. Am I hearing the sound of the magnetic switch? Is it normal?

-- Knowledge Is Responsibility


5 replies so far

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lew

11339 posts in 3218 days


#1 posted 05-20-2009 07:02 PM

It almost sounds like the magnetic switch mounting screws worked loose. Maybe just tightening down the mounting screws may solve the problem. UNPLUG it first!!

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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a1Jim

115202 posts in 3040 days


#2 posted 05-20-2009 07:09 PM

Lew said what I was thinking also.

-- http://artisticwoodstudio.com Custom furniture

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TopamaxSurvivor

17669 posts in 3139 days


#3 posted 05-21-2009 04:41 AM

What you probably have, if there is a magnetic motor starter or relay, is a little bit of dirt or corrosion on the face of the armature. If it won’t wipe off with a clean cloth or blow out, use emery cloth to lightly polish or clean the surfaces. Do not use sand paper, most have some kind of metal residues and you will be doing more damage than good. Do not let some crack pot electrician try to sell you a new mag starter. If he doesn’t know enough to solve a simple problem like that, send him packing if he didn’t take it apart to try it.

Sometimes the winding of the coil or laminations of the armature will loosen up. They are usually riveted together. You may or may not be able to slove the problem in that case.

It won’t really hurt anything as long as the relay isn’t chattering (contacts opening and closing). Just annoying to those of you who can still hear :-)) Sometimes, flourscent lighting ballasts do the same thing as they get older.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Pete_Jud

424 posts in 3216 days


#4 posted 05-21-2009 05:18 AM

If it has a mag switch, there will be a 24 volt transformer that always has power to it when it is connected to power. Very much like a door bell transformer. A low hum is not to uncommon with these.

-- Life is to short to own an ugly boat.

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TopamaxSurvivor

17669 posts in 3139 days


#5 posted 05-21-2009 05:30 AM

Why would they bother to put a 24 v transformer in a bandsaw??? Seems a bit unnecessary.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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