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.

[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 :)

[blackburn mark]

No joy....
Now it will run forward but not in reverse...…
This has me baffled.


It will run forward but not reverse with the Cap on pin2
It will run reverse but not forward with the Cap on pin4




This switching scheme rotates the removed bus bars through 90 degrees, is there a way I could cause damage by trying the cap on the other two pins?

[Clive S]

Have you seen this vid https://www.youtube.com/watch?time_c...ature=emb_logo

I take it, it is a single phase motor with a capacitor

When your motor runs up to speed do you here a click and another when it slows down.

[blackburn mark]

Hi Clive
Its single phase according to the plate and it has a single capacitor
I hear no click on the run-up or run-down

Its an old Clarke motor that yields very little when run through google :(