Yes, the "tooth rest" contact point makes a difference in all these jigs. Drill extension beyond the tooth rest changes the geometry of the grind. Different helix angle drills also require different amounts of stickout beyond the tooth rest. It also matters how aggressive of a grind you are trying to achieve.I have one and it's OK after the learning curve. I found out the relief isn't correct and you need to set it a little more otherwise it makes a sharp bit that won't cut. Also, you need to reset the bit in the holder if you need to remove a lot of material or else the center setting changes too much.
Boring is a precision method of making holes itself, if you set up for boring why not just bore to size and skip the ream?I could be wrong, but when I was in school we were taught drill, bore, ream if you want accurate hole. If your drill takes a turn east or west while drilling, the reamer will follow it. A sharp boring tool will more likely straighten the hole out, then ream to final size.
Beats the tinkle out of me, maybe because a fresh reamer gives a better surface finish.Boring is a precision method of making holes itself, if you set up for boring why not just bore to size and skip the ream?
Have never seen this in practice though in some instances it may be. Having to reverse the tool out of the hole often leaves visible artifacts on the surface.Beats the tinkle out of me, maybe because a fresh reamer gives a better surface finish.