My G4003g Lathe Journey

It's been a while since I installed them, but I don't notice any compression. I also don't think the feet were made of rubber per se; more like some plastic of some sort.

-WRM
 
Hey nice write up and nice lathe! Congratulations
 
I took the rubber feet off my G4003G and made metal ones. The rubber ones needed tweaking every time I checked the level. The metal feet are still dead nutz after almost 2 years.
 
Yep, welcome to the G4003G club. Those are some nice mods that will only improve on a good thing.
Dave
 
I am about to buy something from grizzly, I don't really need big lathe, but I do need very accurate machine for making steel shafts that run 80000 rpm! 12mm OD X 300mm

did you made any accuracy test to the spindle yet? 4 jaw chuck? or even bed ways or using collets? etc...

Oz
 
My 4 jaw can be dialed in as accurately as you're willing to go BUT... This accuracy is close to the jaws. As you get further away it goes off. I believe this is a trait of 4 jaws in general but if the other end is supported by a center, both ends will be as accurate as you are. You'll need a steady rest to go 300mm without deflection in the middle and the G4003G does come with one. I can easily hold to within .001 with a lathe tool but if you're talking tenths that's tool post grinding territory at least at my skill level.
 
Dragon said:
I am about to buy something from grizzly, I don't really need big lathe, but I do need very accurate machine for making steel shafts that run 80000 rpm! 12mm OD X 300mm
Oz
Click to expand...

Whatever you cut will be centered on the axis of the rotating piece. 80,000 rpm is a lot of speed. It will have to be ground. Not sure that kind of part is a task for a general purpose lathe. I suggest you ask the question in the questions forum where you'll get more smart folks reading it.
Dave
 
I am not one of the 'smart folks', but if your rpm requirement isn't a mis-print, I would have that piece made for me by someone who has the proper grinding equipment. But I agree with Dave, post your question in the Questions forum and it will get looked at by more people.
 
I think this g4003g is better choice and more accurate lathe than the g4003 and many other lathes in this cost! for one reason ; and that because it have NSK high quality bearings! most of the headstock accuracy belong to the bearings quality!
BUT if using collet system like E40 or even 5C collets then you can hold same tolerances what the Spindle face have, I agree about having steady rest or live center (if the tail stock dead center with the head) then take first light cut then little medium cut then you will get same reading .0003 in anywhere in the shaft! based on the PDF grizzly sheet. also I see some people grind the sheck jaws tips to zero the center based on the spindle runout!

I believe G4003g is my next choice, I know precision mathew 1340GT is better but money can talk! $$$$ but still G4003G better than precision mathew 1236 !

Oz
 
sorry about my typing mistake:cower: ! the required run-ou of the shaft is up to 8,000 and that more lease RPM :) than my original error! I make DC brushless motors shafts in different lengths!
please forgive :drunk: to much bears can effect the quality of typing too!
 
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