battery powered line bore machine

[Frank S]

it works is all that matters. Ive seen and used line bore jigs that used a gear reduction unit for addvancing the shaft. but your works good and you can feed at the rate you want. sometimes ears are the best way to determan feed rates along you eyes with the chips.

Mark: you are correct nothing takes the place of listening and feeling the rate of cut especially when the cut is interrupted, and I am making a .250" total cut. It will almost self-feed, the large 12 TPI feed thread is smooth enough that the rotation of the shaft when spinning at around 250 RPM especially while the cut is still an interrupted cut on the weld beads creates vibration and just enough friction of the bearings inside to cause the feed to slowly advance.