Lathe Reverse

[blackburn mark]

Hoping someone can verify my assumptions:
This is the motor on my Boxford VST (has one capacitor outside the chassis)





My assumption is that by rotating the bars 90 degrees (red lines) the motor will run in reverse.....?

[driftspin]

Hoping someone can verify my assumptions:
This is the motor on my Boxford VST (has one capacitor outside the chassis)





My assumption is that by rotating the bars 90 degrees (red lines) the motor will run in reverse.....?

Hi Mark,

I think some of us can.

It is just that i would want to see where the capacitor wires are going. just to be sure.

Basically one moves 1 power lead from one side of the capacitor to the other.

I cant really see where all wires are connected now so...

I guess you have this setup.

http://www.electricneutron.com/wp-co...-capacitor.jpg


Grtz Bert.

https://www.google.com/amp/s/www.ele...er-supply/amp/



Verstuurd vanaf mijn SM-A320FL met Tapatalk

[blackburn mark]

Cheers for that... ill have to remove the block tomorrow and take a look as they come in from the back.

[blackburn mark]

I have fitted a switch that impliments the bus bar change... it will now run in reverse ok but i get a single thud in foward but no rotation
I swapped live and nutral which i didnt think would make any diffrence but i am now assuming if a swap them back over, it might run forward but not in reverse....?





If there is something obvious I'm doing wrong, let me know :)
If not, i shall continue the hunt for infomation on this motor.

[driftspin]

I have fitted a switch that impliments the bus bar change... it will now run in reverse ok but i get a single thud in foward but no rotation
I swapped live and nutral which i didnt think would make any diffrence but i am now assuming if a swap them back over, it might run forward but not in reverse....?





If there is something obvious I'm doing wrong, let me know :)
If not, i shall continue the hunt for infomation on this motor.

To reverse in the schematic i posted earlier we may assume the right lead is neutral.

Then the left lead is fase.

when you move the fase wire to the top the motor will reverse direction.

You should check what i am saying next.
In the picture you posted i think the motor wires are all on the bottom row.

Starpoint of the motor is hidden.

Did you draw in green where the actual capacitor is ?





Grtz Bert

Verstuurd vanaf mijn SM-A320FL met Tapatalk

[blackburn mark]

To reverse in the schematic i posted earlier we may assume the right lead is neutral.

The left lead is fase.

when you move the fase wire to the top the motor will reverse direction.


Grtz Bert

Verstuurd vanaf mijn SM-A320FL met Tapatalk

Are you saying I just move the capacitor like this or am I doing as I have been and moving the capacitor AND rotating the bus bars?
You will have to excuse my poor grasp of AC motors

[blackburn mark]

Ah... wait a minute... the three sets of two pins...
My apologies Bert.
I think I'm gaining some perspective, I need to have a ponder on what is going on.

[Sterob]

I helped a mate repair his single phase lathe a couple of years ago after the starting switch fell apart and someone lost some of the parts!
I had trouble reversing the motor ( think it had a cap on it....)
I found that the 'run winding' was centre tapped and , which was neutral and the Active was swapped to either end of the winding to change direction.
This meant that single phase lathe and the 3 phase lathes could use the same sort of drum switch, ie FOR- Off - REV.
I did a drawing but its at work.

Yours may be the same.


I have Rosenburg ( Electric Motor Bible) and there is only a very small mention of this sort of motor in it!

[m_c]

How it changes direction, depends on what kind of capacitor setup is being used.

Essentially you need to swap how the two windings and capacitor are connected. If all you're getting is a thud, it sounds like you've missed the capacitor out of the circuit, or have shorted the capacitor out.
I have tried searching for a suitable diagram, but have so far came up with nothing simple.

I'd suggest putting it back to how it was, then try reversing direction with the bus bars.
If that doesn't work, try moving the capacitor connection by moving the right/outer connection.

[blackburn mark]

I think I might have cracked it.....
I have wired the cap to pin 4 instead of pin 2 (my error // I think my drawing is correct but my actual wiring is wrong)
So in forward, pin 2 is not seeing the cap but in reverse it is.... ill know in an hour or so if I can get my hands in there with a mirror a light and a spanner :)