09-18-2015, 01:10 PM
I think whether one calls them end mills, slot mills, or slot drills is dependent on how old one is. 
I was brought up on end mills and slot mills. End mills where always 4 flutes and slot mills 2 flutes further slot mills could drill holes - hence slot drills. Another point to note they were made to different tolerances, end mills nominal dia minus zero, plus (a bit) whereas slot mills were nominal dia plus zero, minus (a bit).
Of course someone comes along with a 3 flute and centre cutting and that's that
Things always change over time and what is a fact to day doesn't mean it will always be.
DaveH
I was brought up on end mills and slot mills. End mills where always 4 flutes and slot mills 2 flutes further slot mills could drill holes - hence slot drills. Another point to note they were made to different tolerances, end mills nominal dia minus zero, plus (a bit) whereas slot mills were nominal dia plus zero, minus (a bit).
Of course someone comes along with a 3 flute and centre cutting and that's that
Things always change over time and what is a fact to day doesn't mean it will always be.
DaveH