So I finally registered for the CNC exam after putting it off for almost two years, and now I'm kind of panicking. I've been a machinist for six years but honestly never had to think too hard about the theory side of things — G-code, tolerances, speeds and feeds, I do it by feel more than formula. Figured the certification would help me move into a programming role, but looking at the content outline, there's a lot I haven't touched formally since trade school.
I've been going through a CNC practice test this week and I'm hovering around 58%, which feels rough. I'm targeting a test date about eight weeks out. My weak spots are definitely workholding and quality control — the GD&T stuff especially. Has anyone used a structured study guide that actually covers the exam format well, or did you mostly piece things together from different sources?
Any exam tips from people who've been through it recently would be huge. Trying to figure out how many hours a week I realistically need to commit to get to a comfortable passing score.