Offset Milling Attachment

I had one of those in a pile of auction stuff once. They're designed to reach inside bores to cut keyways.
 
Interesting concept, but limited reach and wouldn’t expect it would be very robust/rigid.
 
the longest attachment on mine was 10" I think, to use 3/8" shank endmills. It's for a very specific task, so presumably what this tool allows you to do (cut internal keyways on a vertical mill) more than makes up for any deficiencies in rigidity.
 
mattthemuppet2 said:
the longest attachment on mine was 10" I think, to use 3/8" shank endmills. It's for a very specific task, so presumably what this tool allows you to do (cut internal keyways on a vertical mill) more than makes up for any deficiencies in rigidity.
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More reach and capable than it looked from the patent sketch.
 
Use it many years ago to clean a weld bead from inside a alum box. Worked very well. Limited use, but for the right job very handy. Made me smile seeing it 30 years later.
 
That's a lot of setup and ties up a machine for something that can otherwise be done with a number of other approaches. While I like the idea of machining off a weld bead inside something kind of big, I wouldn't want to use anything that sacrifices so much rigidity and at the same time is expected to cut smoothly through when the work in question is a weld. Maybe it's good for some setups, I'm just not seeing it for the hobby shop.
 
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