Denny
I used to make bronze bushings for punch presses we would rebuild.
An "H" pattern for the oil/grease grooves.
Cut a groove on each end of the bushing, then turn your tool horizontal and brooch between the groove using the carriage by hand. Also make sure to put the chuck in a low gear to prevent any chuck rotation during the brooching.
I usually put three or four horizontal groves between the circular grooves.
Hope this makes sense and helps.
Don
