Bypassing switch + relay to test an A O Smith motor/relay

[everettdavis]

You may find this post from some time ago of benefit if you cannot locate a Mark VII switch.

In it JPG offered a hand drawn schematic on how to re-wire with a toggle switch.

It may be of some help. The only thing I would remind you to do is when switching directions is to allow the motor to stop before reversing.

One could only imagine the stresses you could introduce by slamming it into reverse.

You likely wouldn't do it with your car if it were still in motion, so I would not do it with your Mark VII if you choose this approach.

Reference: http://www.shopsmith.com/ss_forum/viewt ... 76#p178976

It is beyond my personal experience. The difference is that his was G.E. and yours is A.O. Smith, but with the motor drawings you referenced already, you should be able to work it out if you go this direction.

Everett

[JPG]

FWIW:

Reversing the 'direction' switch prematurely(while armature is still rotating) and then turning the power back on is actually non-traumatic.

If the start switch(or relay) is not back to 'normal/rest' it will continue to rotate in the direction already running.

If the start switch(or relay) has closed, the rpm is small so the sudden reversal is relatively benign.

[jsburger]

FWIW:

Reversing the 'direction' switch prematurely(while armature is still rotating) and then turning the power back on is actually non-traumatic.

If the start switch(or relay) is not back to 'normal/rest' it will continue to rotate in the direction already running.

If the start switch(or relay) has closed, the rpm is small so the sudden reversal is relatively benign.

Very interesting point. I never thought about it that way. That is why there is no interlock on the MK VII or is there?

[JPG]

FWIW:

Reversing the 'direction' switch prematurely(while armature is still rotating) and then turning the power back on is actually non-traumatic.

If the start switch(or relay) is not back to 'normal/rest' it will continue to rotate in the direction already running.

If the start switch(or relay) has closed, the rpm is small so the sudden reversal is relatively benign.

Very interesting point. I never thought about it that way. That is why there is no interlock on the MK VII or is there?

The forward/reverse/on/off switch is (intentionally) cumbersome so as to permit a sufficient delay. The key must also be turned between directions.

i.e. it is NOT merely push reverse switch when running in forward.

Push off.

Rotate key.

Push direction.

It can be defeated by rapid sequencing. But why would one want to?

[jsburger]

FWIW:

Reversing the 'direction' switch prematurely(while armature is still rotating) and then turning the power back on is actually non-traumatic.

If the start switch(or relay) is not back to 'normal/rest' it will continue to rotate in the direction already running.

If the start switch(or relay) has closed, the rpm is small so the sudden reversal is relatively benign.

Very interesting point. I never thought about it that way. That is why there is no interlock on the MK VII or is there?

The forward/reverse/on/off switch is (intentionally) cumbersome so as to permit a sufficient delay. The key must also be turned between directions.

i.e. it is NOT merely push reverse switch when running in forward.

Push off.

Rotate key.

Push direction.

It can be defeated by rapid sequencing. But why would one want to?

Got it. I forgot about the key.