G4003g Going 3 Ph Vfd

Ok so I'm about done. I ordered a brake resister and that should be here this week. other than that. i just need to fig out how to set my Pot so at 75 % I'm at 60 HZ that way it gives me a little room to increase the RPMs

I made a few chips with it tonight. It doesn't even feel like the same machine. Very smooth. Im very happy with this.

There is one other thing i would like to address.... and i should of done it before putting the motor on but i forgot about it . the motor needs to be moved over about 1/2" cause the pulley is hanging out farther than i like. It was like that with the factory motor too.

so Maybe if i get ambitious i will pull the motor, drill and tap a tap some new holes. in the plate.

so here is the finished product.

20150426_155328_zpsxzcs4idh.jpg

20150426_155843_zpsgkrnqzj3.jpg

20150426_202347_zpscz7ywpjr.jpg

20150426_202402_zps2tjetibb.jpg

20150426_202411_zpsizkrugwp.jpg

20150426_202313_zpsirfyckkt.jpg
 
Do you get a better finish now?

Now you need to add a photo tach on the spindle to finish the job right....
 
There is one other thing i would like to address.... and i should of done it before putting the motor on but i forgot about it . the motor needs to be moved over about 1/2" cause the pulley is hanging out farther than i like. It was like that with the factory motor too.

Ditto, mine arrived from the factory with the pulley hanging off like yours, the pulley also was machined so poorly it wobbled like a cartoon. I re-drilled and tapped the bracket properly which moved the motor over and the replacement pulley Grizzly sent me ran spot on true like a pulley should.
 
I re-drilled and tapped the bracket properly which moved the motor over and the replacement pulley Grizzly sent me ran spot on true like a pulley should.
Those brackets look like some 4 yo "crafted" the original mold out of play-do. I intend to replace mine with some solid plate with vibration mounts. On my list... not because it isn't functional, but because using plates I can fit in some industrial vibration isolators.
 
Those brackets look like some 4 yo "crafted" the original mold out of play-do. I intend to replace mine with some solid plate with vibration mounts. On my list... not because it isn't functional, but because using plates I can fit in some industrial vibration isolators.

Recommend you remove your belts and measure the vibration at the chuck with just the motor running first. I used some simple .100 thick rubber washers and measured like 1 tenth vibration, that's with the stock China motor. Is it worth a lot of engineering trying to eliminate that? With the belts vibration varied between 1 and 2 tenths. A single belt would probably bring it down further I think some of that vibration was the two belts doing a dance. A serpentine or splined belt drive like I see on some high end cnc lathes and mills might be interesting.
 
Well Dman it has been almost a year since the 3 phase conversion. I was wondering how you like it so far? Would you do anything different?
Would you do it again? Since my G4003G is finally broken in, I am contemplating the 3 phase conversion. I really really dislike the available speeds on the lathe.
The jump from B2 to C3 (360 - 600) is a biggie. So if you would a couple words of wisdom would be appreciated.
Dean
 
Dean...

I Use my lathe Daily... In my home garage .. I mostly work aluminum but the Machine has treated me very well

I can tell you this, i don't think i will ever buy another single phase machine. LOL The VFD gives you so many options...

I have the JOG set up so that when i do my threading i stop short and JOG it in.

I Pretty much Use 2 speeds on my Lathe now. I keep it at 1000 for most general work and threading i put it at 70. for anything faster or slower i just tune it in with the POT.


The Braking is SOO nice. ..... I can't say enough good things about it. Im totally happy with it.

I couldn't get a finish like this before...

20160130_120919_zpscjebqfvk.jpg

20160130_120919_zpscjebqfvk.jpg

20160130_120919_zpscjebqfvk.jpg

20160130_120919_zpscjebqfvk.jpg

20160130_120919_zpscjebqfvk.jpg

20160130_120919_zpscjebqfvk.jpg
 
The Braking is SOO nice. ..... I can't say enough good things about it. Im totally happy with it.
This is with your external braking resistor? Where did you order it from?

Did you set it up to actively brake whenever you turn off the spindle? I was curious how well that would work with the momentum of all the gearing working to keep things going, although I guess the natural mechanical advantage (1800 rpm motor stepped down to 1000 rpm spindle) would help when you were in lower spindle speed settings.

Mounting it on the base door is a nice touch. No need for another electrical cabinet, plus it is probably roomy enough in there that you don't have to worry about it overheating without adding an external ventilation fan.
 
Dman thanks so much for the reply. Ok now your gonna make me spend some more money Flustered.
Next question if you don't mind. Did you stick with the wiring diagram that MKSJ did for you?
Any modifications or last minute upgrades?

I just finished building the machine tachometer from http://machtach.com/
Very nice compact unit. Worked right off the bat. Another reason to go 3 phase all of the posted rpms are way off.

Anyway thanks for the help, anymore tips or tricks are greatly appreciated.
By the way very nice finish on those parts.

Dean
 
Dean,

I have a similar yet different make/model lathe, and I went with the VFD/braking resistor combo as well as the Machtach. Couldn't ask for a better setup IMO, and like Dman I seldom use more than two speed ranges on the head and just use the VFD for speed control. Love the braking! I don't miss having a mechanical foot brake at all.

MKSJ was a huge help with the VFD as I was completely new to this sort of thing. After it was all done, I'm very glad I did. I even opted to do the same thing to my mill. :D
 
Back
Top