Waterjet accuracy?

[asid61]

Originally Posted by Chris is me

I can't actually answer your question at the moment, though maybe if I'm nice enough I can run some waterjet parts over to RPI's DMM and find out...

However, I can attest to gearboxes working with waterjet plates. The reason for this is pretty simple. It's one of those things that you can get away with in FRC due to the extremely short run time of an FRC robot. While in the real world, you wouldn't want to run a gearbox for 10,000 hours with +/-.003 tolerances, it's usually fine to run waterjet gearboxes for FRC purposes.

The taper (kerf?) is a real phenomena, but it's usually slight enough to ignore. For bearing holes, one should ream out everything they make anyway if they want a true precise press fit, so the taper isn't a big deal.

Our waterjet parts (relatively few each year) are reasonably accurate. Hole centers are located properly, if not the sizes themselves. I'd be comfortable doing just about anything 2D used on an FRC robot on a waterjet.

Ok. I usually design with +0.000 distance between centers on my gears. How much do you account for?
EDIT: For reamers, do you use a 1.123" or 1.124" reamer? Where do you get that? Have you ever tried waterjetting, then finishing on a mill?