Hi all,
I was out playing with my new-to-me mill and was having difficulty finding appropriate cutting speeds for TiN coated end mills in either my old
Machinery's Handbook or more modern Shop Practices book. Both show speeds
HSS and Cobalt, but not TiN coated. Any rules of thumb for these bits? For
home shop use, should I follow the speeds for HSS?
I suspect I ran my half inch end mill at a speed that was too high. I was taking small cuts on what in retrospect I think was harder steel than I'd anticipated, and I got glowing red "sparks", smoking cutting oil, and a loud and unattractive screeching noise. It sounded like the end mill trying to RUB the metal off rather than cut it off. The end mill looks like it's seen better days... Probably not my finest moment as a budding machinist.
Regards,
Peter
I was out playing with my new-to-me mill and was having difficulty finding appropriate cutting speeds for TiN coated end mills in either my old
I suspect I ran my half inch end mill at a speed that was too high. I was taking small cuts on what in retrospect I think was harder steel than I'd anticipated, and I got glowing red "sparks", smoking cutting oil, and a loud and unattractive screeching noise. It sounded like the end mill trying to RUB the metal off rather than cut it off. The end mill looks like it's seen better days... Probably not my finest moment as a budding machinist.
Regards,
Peter