Where are you getting your parts for generic Taiwanese or Chinese mills? They have different brand names but seem to all share castings and components from same sources. Need a hand wheel or two.
Don't recall my sources because I re-purchased industrial grade machinery about 10 years ago and only use the Chi-Wan machinery for quick secondary operations so it isn't used very often or for very long. For any components that need replacement or upgrading (motors) I try to source from industrial suppliers like Carr-Lane that are known for supplying components in building machine tools. When I contracted to Denso they exclusively used Misumi for everything, the catalog is extensive and the products were very decent quality. For almost everything I try to read about the product materials used to determine if it's just cheap **** or not.
Anything not readily available I either make the whole thing or modify an existing one. It's important to understand what you're asking for, like a gear for example, so you can specify exactly what you want from a variety of suppliers. Very little is made that someone else isn't already making. A simple spur gear hasn't been re-invented for machine applications, a readily available design is used but the material is often changed to lower costs at the expense of durability. If you can measure things, how they're supposed to be measured, and learn the nomenclature (pressure angle, pitch, in the gear example) you don't have to rely on a factory replacement that wasn't made worth a sh*t to begin with. Companies often rely on less informed consumers for repeat business.
For hand wheels do you need a graduated wheel or just something to crank the axis? Either can be made if you have a lathe, mill, and a rotary table (or dividing head). I've made several for machinery the company made and it's not difficult, just unfamiliar if you've never done this. Whatever you do need I'd suggest you look up an industrial supply house for better made components. The Chinese are very capable of making good quality things but most of them don't seem to reach the outside markets. Unless under strict contractual obligation and on-site supervision you never really know what you're going to get, most stuff available to the average consumer from China (and their sources) is just cheap **** that will fail sooner than it should.
Different brands do often share the same castings but the machining of said castings is varying levels of workmanship. If you ever have to disassemble a Chi-Wan machine you'll readily see what I mean. Mating surfaces might only be machined to 65% clean up, surface finishes are often rough, excessive play in the gibs just to get the slide to even function, perpendicular/parallel surfaces aren't, poor material integrity, porous castings, etc. The price you pay often dictates the level of quality/integrity to expect. Smaller items/components for the same distributor might be from 4-5 small shops under the same contract but different levels of workmanship. I worked for Denso (Japanese) buying plastic injection molds around the world and an internal company directive was to make sure an industrial liaison was present during all phases of mold construction to ensure cheaper materials weren't switched, and short-cuts weren't taken. The Japanese apparently didn't trust the Chinese either and for good reason. This is a big reason I still make/modify things myself, far too many shoddy goods on the market because far too many think that all things are equal except the price. They most certainly are NOT equal. I think I've bored everybody enough for now so I'll go sit down in the back row. Ganbatte.
the lathe started that back last year when I got it.