Originally Posted by
tommylight
If you think you can set up MACH3 for it, go for the 150 for sure, it will wait for an ARC_OK and then start moving. The SD is simpler and requires no set-up in Mach except the usual, it will handle the up/down movement on it's own, but will require G28 or G38 before the start of a cut to find the work piece, that can be done by sheetcam or similar software. On the other hand, the 150 coupled with Linuxcnc works like a charm, there is already a complete config with an how to on this forum and on the Linuxcnc forum, together with videos on how to connect it to an older plasma cutter etc. If you have spare inputs on the BOB, go for the 150. I have 3 of them installed on production machines, and they never fail. I also have 1 SD mounted and working without a hitch, ever.
On a side note, i have developed and built a new version of THC with a big display, lots of setings and much faster, made to my spec and my extensive experience with plasma cutters and electronics, configurable to every plasma cutter, able to work with Linuxcnc and mach3 natively, etc etc. More info as it develops.
Tom