My Grizzly G0602 Lathe

Looks good AlekseySP . What kind of accuracy can your lathe hold?

my1987toyota wrote:

Looks good AlekseySP . What kind of accuracy can your lathe hold?

It's hard to say, we have only cheap iGage scale on Z, so we didn't measure accuracy in all working space. But repeatability is very good, within few tenths. First i had some problems, but after tuning servos everything was fine.
But don't expect a miracle, you will have to figure out what machine can do and what can't. Removing a compound slide improves rigidity. If you want to use simple steppers 1.8 deg 200 steps per rev, keep in mind their downsides: first, they are slow. In the beginning it might be a not a bad thing but after a while it's getting annoying. Faster they spin more chance to lose steps. And don't forget about acceleration, it's a very important parameter. Second problem of stepper is a resolution: 200 pulses per rev with 5mm pitch ballscrew gives you approximately 0.001in increment. Setting microstep helps during motion, but motor can't stop between full steps. Again, for most hobby projects it's enough. Plus nothing can beat a price.

thanks AlexseySP I will defiantly keep that in mind during the build.

Well I did it. The lathe has been ordered just moments ago . I decided to still go with the G0602Z with
the already installed DRO instead of sourcing the linear scales and installing them myself. I cant wait to
dig into this machine and CNC it.

1) I converted my Lathe two years back. I have two encoders for X/Z to use it manually. I'd strongly recommend this.

2) I do have Glasscales and think this is a waste of money. I did this to measure tolerances / fits in X, but you never measure really what happens on the part.

3) open loop steppers work fine. You want to use a belt reduction on X to get resolution. I think I get 0.002mm resolution in X and 1m/min travel.

4) I used a normal spindle in X for space reasons. Ballscrews are imho not essential on a lathe

5) I used Machinekit + Beaglebone Black and IO over PRU. Main reason are that I needed lots of IO
Mesa Cards are an option and I would consider this

6) since this is the show your stuff forum.... Video here. Enable the English subtitles

Del

thanks Malte S ,I may have to try the dual MPG wheels on my build. I was just going to do a single with a selector switch
but now the dual wheels look extremely handy to have . The biggest problem I had with going to glass scales
on a machine like the one I am getting is how much space the X axis glass scale would require over the magnetic one.

another quick update . The ballscrew kit and steppers have been ordered
ballscrew kit
stepper motors
A few steps closer.

I do have a question for those who have built cnc lathes .
Is it better to drill with the tail stock drill chuck or set up a drill chuck for the quick change tool post ?
and What rotary encoder is recommended for the spindle ?

I have both drilling options but almost exclusively use the tailstock. But I think that depends on the use case. If you make the same part all the time and that involves driĺing you want a turrent (i dont have one) and the ability to drill

I used printed parts and sensors as encoder. But setting this up to have the right distance was a pain. A pic is here:
forum.zerspanungsbude.net/viewtopic.php?...394&start=10#p453365

thank you MalteS. unfortunately I cant read German. That said the pictures were very informative.
I am trying to figure out if I should go that route or use one of the Omron rotary encoders with a drive belt
off the spindle