NM-
This is actually a very interesting question. I did quite a bit of research on these (Chinese) imports a while back when I was in the market for a milling machine. Though not necessarily made in the exact same factory, all of these machines are made in a loosely related group of factories interspersed in both Taiwan and Mainland China, who share the same basic plans, parts, and raw castings. These factories coordinate with the various marketing groups (Jet, Grizzly, Harbor Freight, etc.) to allow each to specify different features and degrees of “fit and finish” in their machines. This “customization” allows each brand to differentiate itself from others and appeal to slightly different market segments and price ranges. This is very similar to the Western model where a company such as GM markets what is essentially the same vehicle under different names such as Pontiac, Olds, Plymouth, etc. with only minor differences in appearance and accessories between them. In the Chinese situation however, these differences are more clearly defined in a range of “quality grades”, from low to high, that follow price (the technical, Harvard MBA school term for this is “vertical differentiation”).
From what I can tell, the “quality grades” of the various brands (from low to high) are:
1. Harbor Freight, or any of the Generic machines sold under the brands General Machinery, Central Machinery, Chicago, Pittsburgh, etc. (note the clever use of American names).
2. The generic Enco brand of machines.
3. Grizzly
4. Jet
5. Jet Gold series, Grizzly Z series, and Turn-Pro
6. Birmingham
7. Powermatic, Webb, and Wilton machine tools
From my experience, I won’t even look at anything from groups 1 or 2 anymore, they’re pretty much junk, while grades 4 and above are starting to show fairly decent quality now. Note also that the Turn-Pro (carried by Enco) is the same as the higher end Jet and Grizzly. Incidentally, when I discovered that all of these machines, regardless of ranking, still contain some parts made in Mainland (Communist) China, I became soured on the whole import route and decided to purchase a used, American made, Bridgeport. Hope this helps…
RP