Fly bars are rarely sold commercially; they are usually made by the user.
2.
Fly bars are perhaps a bit more dangerous to use than endmills and regular fly cutters because of their larger swing.
3.
Fly cutters with two tool bits have no " official " name but are often called double fly cutters, double-end fly cutters, or fly bars.
4.
Well-made fly bars in conscientious hands give years of trouble-free, cost-effective service for the facing off of large polygonal workpieces such as die / mold blocks.
5.
As one machinist put it, running a fly bar is like " running a lawn mower without the deck ", that is, the exposed swinging cutter is a rather large opportunity to take in nearby hand tools, rags, fingers, and so on.
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