First off, I own a G4000, and have done a number of the "tweaks" that make it more useful/reliable/rigid. This has included changing to a "4-bolt compound" fastening system (from LMS), adding a QCTP, and fabricating a "reverse tumbler" to allow turning left-hand threads. Future mods will likely include a variable speed motor (either DC or 3 phase) and installing the new carriage lock (bike seat quick release) that I bought recently. There's a good Yahoo group (9x20Lathe) that's loaded with tips and tricks.
Looking at this thread got me interested in the G0602 (and its 3 phase cousin, the G0752). I downloaded the manual, read it carefully, and came up with the following comparisons to the G4000. Some of the items might be a bit obscure for anybody that's not familiar with the G4000, but I'll be glad to answer questions as they come up.
1. There's no "independent" way to get threading and power feed. On the G4000, there are two (sometimes poorly) interlocked levers on the apron, which either engage the half-nuts for threading or couple the rotating leadscrew to the carriage rack. The G0602 does not have the latter feature. You have to do a pseudo-”very fine thread” setup on the change gears to get power feed. Not very convenient, as you need to swap three gears to get a metric thread, two gears and reposition of a third to get inch threads.
2. As with the G4000, there is *no* provision for LH threading on the G0602.
3. The “final leadscrew drive” of the G4000 has a manually oiled semi-open gearbox with 9 gears, selected by sliding a pin-equipped lever sideways (sometimes easier than others). The G0602 has an oil filled gear box with two 3-speed selector knobs. This looks to be a superior design.
4. The top of the compound slide on the G0602 has a large T-slot, which makes it *much* easier to mount a QCTP than on the G4000, which has a pressed-in M8 stud. This T-slot makes the compound just a bit taller, which is probably one of the major reasons the G0602 has a larger swing (advertised as 10”, but specified as 9 5/8” in the manual) than the G4000 (advertised as 9”, specified as 8 3/4” in the manual). Unfortunately, both the G0602 and the G4000 use the notorious “2-bolt compound” angle adjusting ring, one of the major points of non-rigidity with the G4000. But unlike the G4000 the G0602 does *not* have T-slots atop the cross slide. So adding a “4-bolt compound” retrofit would not be anywhere near as simple.
5. Both the G4000 and the G0602 spindle speeds are based on which pulleys are used. Both have 6 speeds. The G0602 has the advantage of using a heftier (3/8”) V-belt than the G4000 (5m). But it has two disadvantages. First off, the G0602 uses two different V-belts, depending on which speed is to be set up. Secondly, the tensioner only operates with one of the belts. As far as I can tell, there’s no way to release tension when installing or adjusting the other belt.
6. As others have notes, the G0602 wins hands-down in the spindle and chuck department. Spindle bore is larger, spindle nose threads are more “standard” (1 3/4” x 8tpi) than on the G4000 (39x4mm). Spindle has MT4 taper, tailstock MT3 (vs MT3-MT2 on the G4000). The G0602 has a chuck retainer on the spindle. And finally, the G0602 comes with a “genuine” 4-jaw chuck, unlike the “glorified faceplate” you get with the G4000.
7. Both lathes have a somewhat functional carriage lock (socket-head screw on top, which loves to get clogged with swarf), and the G0602 includes a sort-of cross slide lock. This may well be OK, but being a setscrew, you’ll have to keep yet another the allen wrench handy.
My “bottom line” opinion is that, while G0602’s features are well worth the $200 price bump, this lathe will disappoint anybody who expects it to be the “next step up.” It still requires some tweaks and mods to make it more rigid and functional. YMMV!
PS - I’d be willing to bet that Grizzly plans to phase out the G4000 as soon as their stock runs out.
- John Herrmann