It's not necesserily a bad idea. The nuts you're refering to are called tube nuts i think. What is the pitch of the M6 rod. Is it standard metric rod? If so the pitch will be 1mm instead of the 0.8mm pitch on a standard M5 rod. So you would have to alter the step ratio on the Z motor accordingly. I'll have a look at what the code is for this and get back to you.
Right i've had a look and it is the M92 command. I think you should be able to put it in the config.g file.
It will be
M92 Zsteps per mm
If you find the original steps and scale it to whatever new size of rod you put in. I think in your case it will be 5mm pitch/6mm pitch so 0.8/1=0.8.
Another thread that states the Z steps per mm
So your new value would be M92 Z3200.
I may be wrong, and if i am please correct me as its the only way i'll learn.
Edited 4 time(s). Last edit at 02/27/2014 07:42AM by jy_oc_hx.