I also use Mach3 for my SC420. If you like, I could send my config file to you. With this file everything should be working out of the box. For the tool length sensor I can also give you the settings. The post processor for Fusion and Mach3 can be downloaded directly from Autodesk and works just fine.
When you have bought your machine or anytime else please give me a short note. I will provide the config files than.
The only difference between man and boys is the price of their toys.
Fusion360, Mach3, UC100, SC 2/420, Kress 1050 FME-P, Sorotec Nutenplatte, Sorotec Vakuumtisch
I got a setup to Mach from my dealer, i did have to change the Softlimits settings so G28 could be use, but not change anything else.. still waiting for my Kress to test if it can do what the dealer says, cut better or = to 0.1 mm