bad motor?

[beeg]

BINGO!!! that's your problem. A 20 amp circuit that EVERYTHING is on. I have the 14ga wire on my SS and on a dedicated circuit, with a slow blow breaker. NO problems with it that way.
The only source of a new motor is through SS, but it doesn't sound like you need one.
Now about those 15 amp motors, what horse power do they develop? I mean the ACTUAL, knot the advertised amount.

[JPG40504]

I think you have already both determined the cause and the solution. I believe you have LOW GARAGE POWER!;) I would NOT continue 'pushing' the motor with what is probably a brownout condition(low voltage/hard on motors)'. You referred to it as a mark 5 AND you said it had a 1 1/8HP motor. From this I conclude you have a "goldie" manufactured between 1962 and 1968. This model WAS sold with a 9" blade although with the 1 1/8HP motor a 10" blade should not be a problem.

[8iowa]

jarod:

The 15 amp saws that you mentioned are powered by "universal type" electrical motors - a completely different type of electrical machine from the "induction type" electric motor in your Shopsmith. Universal motors have very high speed and very low torque and have lower efficiency. They are not standardized, and are usually rated in amps. The actual HP is anyone's guess.

The 1 1/8 HP motor in your Shopsmith will outperform any of the "15 amp" saws by a large margin.

[johnmccrossen]

Hello and welcome to the forum. Upgrading the power cord to 12ga. is a good thing to do. Your machine probably has a two wire cord and the motor is not grounded.

I am assuming that you have unplugged everything, especially the garage heater. Before I added a dedicated 20A circuit for SS and dust collector, I used to forget to turn off the space heater and when it cycled on, oops. I also sometimes would forget that I had another space heater in my 5th wheel that was also on the same garage circuit. So even when I turned off the garage heater, when the other heater would cycle on, then oops again. The dedicated circuit and the upgraded 12ga. power cord for the SS has solved all issues. Good luck. John McCrossen

[dusty]

i have a Mark 5 that i just inherited from my grandfather who has had it for as long as i know, probably 30-40 years (unless shopsmith isnt that old?) anyways, i went though and gave it a thorough oiling and cleaning and have started using it. most everything seems to work just fine except: i tried ripping some 2x4 and 2x6's in half, i set the saw to the saw/joint setting as with any other cutting and went at it. not more than a second of cutting it stopped and blew the breaker, i tried again and it did the same thing. i then slowed it down to the Magna Dado speed and started again, if i went slow enough (about 1 inch a min.) then it would just bearly make it through without blowing the breaker, but it took 20 mins to make it through the first cut and that was only half way through i still had to flip it over and do it again. so my question is: is this normal for a shopsmith? (it has a 13.4amp motor) or is the motor dying on me? aslo would i have to replace it with a shopsmith motor or does anyone know if its possible to use a standard electric motor? i am used to using one of those portable "contractor" table saws and it rips through 2x6's with ease. please advise, thank you Jarod. :)

This has already been answered but yes, if you want the motor to fit in the headstock you'll have to replace the motor with a motor that was built for the Shopsmith. If you buy it new, it ain't cheap. About $250.00 plus shipping. But you have not described a problem that would make me suspect the motor.

The first thing I would do is inspect the power cord. It should be at least 14 ga and should be flexible. When you bend it it should not crack and kringle (dried out rubber cracking).

After passing that test, I would move the Mark V to a location where it can be plugged directly into an outlet that you know is at least 14ga wire with at least a 15amp breaker.

Starting at low speed, you should be able to power up the Shopsmith and increase the speed to maximum without tripping the circuit breaker. This is a "no load" test and the Shopsmith should not bog down. Run the speed up and down two or three times. This being done successfully, I would say that the motor itself is good.

Now, it is time to start evaluating the service wiring and voltage levels available to the Mark V at the location of intended usage.

Ideally, you'll have a 20 amp service available at that location, having been provided on at least 12ga wire. I would recommend that you plug NOTHING else into the circuit that feeds the Mark V.

Now I have outlets on my "dedicated circuit" that can be used for any number of other items but they are not used when the Shopsmith is being used. In fact, I have a belt sander, scroll saw and band saw all on that same circuit.

If I was to rewire the entire shop, I would not share that circuit - it would truely be dedicated. As it is, I have three independent feeds into the garage/shop.

All of the outlets available at the work bench are on one, the lights, some outlets and dust collector are on one and the Mark V and SPT are on the third. They are all 20amp circuits.