10-28-2015, 11:54 AM
I assume we are talking 'bump' (pressure, force) knurling and not the cut knurling.
I do it at 90 rpm because that is as slow my lathe will go, slower may be better (40 rpm)
If you have force flood coolant that will be good to flush away the chips. If you don't have any force flood coolant then here's my little secret.
This will be our secret so don't go and tell everyone
You will need a hard small brush a small brass or steel one and as the knurling starts brush as hard and as fast as you can to get rid of all the little chips. Chips from the work piece and the knurls.
This stops the little bits getting embedded into the work piece gives a better knurl.
Now be careful - don't get the brush caught up it will wreck your knurling, your knurling tool and your nerves. So be careful
it can be quite scary when it happens - I know from experience 
DaveH
I do it at 90 rpm because that is as slow my lathe will go, slower may be better (40 rpm)
If you have force flood coolant that will be good to flush away the chips. If you don't have any force flood coolant then here's my little secret.
This will be our secret so don't go and tell everyone
You will need a hard small brush a small brass or steel one and as the knurling starts brush as hard and as fast as you can to get rid of all the little chips. Chips from the work piece and the knurls.
This stops the little bits getting embedded into the work piece gives a better knurl.Now be careful - don't get the brush caught up it will wreck your knurling, your knurling tool and your nerves. So be careful
it can be quite scary when it happens - I know from experience DaveH
a child of the 60's and 50's and a bit of the 40's