I bought a Chinese hy 3040 column 4 axis mill. It only works with manual spindle control.
I loaded in my Mach 3, i keyed in the inputs given to me in the machine documentation.
I am running 4 axis so I also did tool path set to radius .3525.
When I hit tab key, the jog screen, z was correct up and down. Hard to remember for sure but I believe all 3 x,y and a, ran in reverse. So if it hit x left button in jog the machine goes right.
I did a bunch of online searches, best I came up with was toggle home limits to reversed. In doing that, machine jogs correct in all directions.
I installed a bit, took machine to beginning, set my zeros and ran a g code that I know works, because I have a Syil x5 I use every day with these codes.
After 2 hrs, the part was finished and looked perfect. I removed it and then....oh my!! It's cut in reverse, the bottom is still the bottom but the left to right is flipped or mirrored! Image the word "BIG". It is cut as GIB, and each letter is backwards...so the letter B should be straight line left but the straight line is right and the arcs on left, a backwards B.