3 phase lathe help?

[JoeyInCali]

I don't see why it would matter. Mine is running twice the speed it was designed to and I can still live thread. There is only one motor which controls the head stock and the carriage through a system of gears. They should be synced together. How does the converter change that? I haven't used one but I understood that they just changed the current flow, not the mechanics of the lathe?

I don't see the correlation either.
The saddle still travels at the ratio/proportion the gear and leadscrew are set.
One way to prove this is spin the chuck by hand.

 

[ChampionsRepair]

Hi,

Makes sense.

My friend bought a Clausing and put on the converter and he says after converting he can't cut threads correctly. He is a very good machinist who knows what he is doing.

Now that I think of it, maybe his problem is not in the converter / motor / trans. function but may be the frequency speed control along with the converter added to the mix. The LED on the speed control might be giving him the wrong numbers to sync with the thread chart.

Sorry to post info that may have been misleading. :scratchhead:

Rick

Sounds like you should take your tachometer over there and give him a hand as he has obviously lost track of his sfpm. Is it just me or do you edit almost all of your posts?

 

[JoeyInCali]

Sounds like you should take your tachometer over there and give him a hand as he has obviously lost track of his sfpm. Is it just me or do you edit almost all of your posts?

I don't even guess anymore.
When I live thread, I go the slowest and second slowest spindle speed on mine.
I don't follow the minor/major rules when threading wood all the time. I only follow in ferrule tenons. The rest ( mostly bigger tenons ) I follow my IFUTM rules.

 

[scdiveteam]

Sounds like you should take your tachometer over there and give him a hand as he has obviously lost track of his sfpm. Is it just me or do you edit almost all of your posts?

Yes I do edit my posts to correct things. After you made your comment I realized it was not the motor/gearing but the speed calibration.

Rick