boring bar

[kd4gij]

Needed a 1 1/4" boring bar 18" long. After checking prices. Grabbed a piece oA2 stock and made this. Uses 3/8" tools.

 

[craptain]

I have a shorter but otherwise similar boring bar. Mine works well, but will yours flex under load?

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[kd4gij]

My deep boring is usually bronze. witch with light cuts works fine. I don't except to use the full length. The bars out there are 14" with is fine This was 18"" so I just left it.

 

[Chipper5783]

I have a shorter but otherwise similar boring bar. Mine works well, but will yours flex under load?

The bar will flex. They all do. Even a good sized solid carbide bar with minimal overhang will still deflect under load (it has to). Managing deflection is called "machining".

When boring I generally set the tool slightly above center, then as it deflects the load is slightly reduced.