"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message
. 3.70...
Ignoramus11700 fired this
volley in
:

EVen making very small cuts?

Not even taking off mere swarf, Ig.

Lloyd

I just tried boring some water pipe scrap with a 9/16" diameter
Armstrong boring bar extended 7.5" from the holder and set slightly
above center to let it deflect out of the cut. The pipe was chucked
close so all vibration came from the bar. It's slow at 0.002"/pass and
the finish is poor but it does work well enough to remove the welding
flash and recenter the hole to drill or ream it further.. Reducing
speed removed the chatter pattern.

1/2" pipe (0.840" OD) might be a good cheap candidate for a home-made
boring bar. The bit retaining screw threaded into the end could be a
3/8" pipe plug for Schedule 40 pipe, or a 5/8" machine screw for Sch80
Considering how readily my test setup chattered, enough to shift the
feed handles, I wouldn't run this unattended.
jsw