Thanks for the advice. I will go over the table tomorrow and tighten all the bolts up. I took apart the z axis to clean up the lead screw and bronze nut. What torque setting do you run your z axis at? I've had to up it to 100-110 in order for the torch to touch off on the plate. Have you cut much 1/4" - 5/8" plate? How about holes in this plate?
I've been able to drop mine down to 45 now and have reliable touch offs. Also the number of missed pulses setting right below it is important to get as low as possible for light touch offs and accurate pierce heights. I think I have mine at about 80 or 90 now. Those numbers had to be much higher before I went through the Z to clean and adjust everything.
DT does have Ohmic sensing available now and I plan to make that upgrade soon.
I mostly cut 10-16 gauge, have done a little up to 3/8" with good results.