Quote Originally Posted by biketrialsdave View Post
Hmm if I can get away with 100A/2.5mm electrodes then maybe. Although it is an added cost...

The rail I have takes M4 bolts so thats 4.28 threads for 3mm and 5.71 for 4mm... I think the rule is 1x the diameter?
Listen trust me it will be fine. One more added point My machine was mounted vertical for well over a year and other than hanging from the ceiling you couldn't put more stress on the bolts has they had all the weight of the gantry bearing down on them and they didn't even flinch. Go for it won't be problem.!