I think Stefan Gotteswinter shows how to make small boring bars on his YouTube channel. It sounds like it'll require a shaper; good thing I just got one!I've never seen anything like that boring bar in any of the catalogs. My guess is that you could make one out of a 7/8" arbor. Making the square hole for the cutter would be "interesting", though.
Oh yeah, I've been raptly following your thread; it's very interesting.Steve S., I also have a MF, number 556, I have a thread here.. http://www.hobby-machinist.com/threads/atlas-horizontal-mill.21602/
Oh, God no! The more information that's shared, the better.snip...
Steve, I hope you don't consider this as messing up your thread!
-brino
Vince,Going by the photo in the first post of this thread, it looks to me like a much of the countershaft assembly has been replaced by a previous owner. The step pulleys, shaft, bearings and the casting that holds them don't look original. The casting the bolts directly to the side of the mill does look original though.
Here's a photo of mine with the guard removed. (The holes at the end of the countershaft are for mounting the guard.)