[jimmearns]

I have seen this, only bvery occasionally the Mach3 misses a line - don't know why but it always appears to be the Z up move. I have reduced the incidence of this by making sure the computer is not running ANY background programs. Also, on critical parts add another Z up to the g code so if it misses one it will do the movbe with the second command. Bit of a nuisance hand coding in another line, but better than remaking an important part.