Band saw motor starts, runs until blade has resistance

[Sedgehammer]

No, not a wood band saw ...... 🤷 
Ellis 1600 metal miter saw. Have had it for about 3 years. Was @ times in the past when starting it would start/stop 3 or 4 times before running. Electrician said not to worry about it. Have 122 volts @ the breaker. Tried 2 different extension cords. Same effect

[Don P]

Does it have a run capacitor? Usually a metal can.

[rusticretreater]

That's a pretty hefty saw.  An electrician said not to worry about it?  Get a new electrician!

As Don P mentioned, it is likely the run capacitor.  On the outside of the motor, there are two covers for the capacitors.  One capacitor is the start capacitor, the other is the run capacitor.  They may both be the same, but likely they have different electrical values.

A visual inspection may reveal which capacitor has failed.  They crack, pop open or leak fluid.  Capacitors can be tested.  If the capacitors check out ok, then the motor probably lost a winding.

[Don P]

I bit my tongue but had the same thought  :D
Often start caps are in a plastic case and runs are in a metal one, but not always.

[barbender]

That was my immediate thought, too. An electrician that doesn't want to get his hands dirty, or what?

[rusticretreater]

Probably thought there was no money in getting involved.

[Southside]

Looking online that has a multi voltage motor. You SURE it's tapped for 120V and not 240? 

[rusticretreater]

He said it would start and run.  A motor wired for 240 on a 120 feed wouldn't run at all.

[sawguy21]

x2. All the smoke would get out.

[Southside]

Actually with a start capacitor they will, learned that expensive lesson personally, and it fell on it's face as soon as it had any load on it. 

[Sedgehammer]

Well, i feel dumb today. Actually last night as well. I got to thinking what else it could be and it dawned on me it could be the motor stop hitting on the clamp used to hold the item being sawed. I just checked it and walla, there's the problem. Evidently it was slightly loose and moved a little bit every time I used it. The last tightening moved it far enough to make it stop early. Thanks for all the replies that I haven't even seen yet, as I wad replying to Don's comment and I see there's 8 replies yet. Anyways, thanks again




 

[Sedgehammer]

Single capacitor. 120V. From what i read it's a start capacitor





 

 

 

[Sedgehammer]

I really appreciate all the help that's usually posted when someone needs help with something. That resource alone makes this forum highly valued

[Southside]

Glad it was a simple fix. You mentioned extension cord in the beginning, just remember the longer the cord, the greater the voltage drop under load.

Ran into that with a sealer unit. Eliminated the cord, issue solved.

[Sedgehammer]

Yeah, true. I over size them for that very reason

[newoodguy78]

Making sure your cords have a good ground plug on them is important too. I've had tools and other electrical items do some silly things when unknowingly there was a problem with the ground.