Boring a pully that is keyed with a boring bar

[gonzo]

If i am careful and the boring bar is stiff, can I get away with it?
Hole is 5/8 and I need 17 mm.

 

[mmcmdl]

Sure ! No issue . If you ream it to final size , make sure you use a spiral reamer .

 

[FOMOGO]

I'd go Gonzo on it.

 

[francist]

I’ve also done it where I’ve glued in (Loctite or super glue) a dummy key to fill the gap prior to boring. Once it’s to size a bit of heat will release the adhesive to knock the filler out. Probably not worth it for small differences in size but for larger changes it makes for easier going and less bang-bang-bang on the interrupted cut.