Yesterday was my 1st time cutting 3/8 on my table.Im running a TD A60 torch. http://www.weldfabulous.com/p-22383-the ... torch.aspx
I already have a preloaded tool in sheet cam for 3/8 but it was way too fast at 50ipm.I went back and cut it down to 25 and it did way better.Figured I would kick it down to even lower and see the results.Also changed the lead in from .25 to .3 -BUT- the thermal dynamics book does have a suggestion of 1.2 lead in.
The media blasted one is
.3 lead in
Raw metal one is
.3 lead in
Things I noticed -
-On 15ipm way more underside slag and some on top
-counter clockwise made the 1inch hole on right slightly better
-Also on 15ipm the metal underside looked too burned "browned"
For sure I should stick with the 17ipm but not sure how I can improve the hole quality or just give in and drill them out.The only holes that matter are the one to the far left and the far right,other weird shape 1 is cosmetic.
On both setups there is some slight angling of the cut towards the bottom of it.Going outward but its hardly noticeable to the eye but when i put the pieces in next to each other there is the gap from the lower part being further out.