10-27-2015, 01:27 PM
Normally blue chips mean the spindle speed is a little too fast - try 600 rpm. Of course the feed may have to be reduced.
For the same dia end mill, the faster the spindle speed - the faster the feed can be, the two are linked. However one cannot just increase the spindle speed and the feed and hope all will be well - it won't. Expressive spindle speed will blunt the HSS end mill very quickly and blue chips are an indication of this.
We are only talking HSS end mills.
Also have a look at this it may help. http://www.metalworkingfun.com/thread-776.html
DaveH
PS I posted this a fraction of a second after Sunset posted
For the same dia end mill, the faster the spindle speed - the faster the feed can be, the two are linked. However one cannot just increase the spindle speed and the feed and hope all will be well - it won't. Expressive spindle speed will blunt the HSS end mill very quickly and blue chips are an indication of this.
We are only talking HSS end mills.
Also have a look at this it may help. http://www.metalworkingfun.com/thread-776.html
DaveH
PS I posted this a fraction of a second after Sunset posted
a child of the 60's and 50's and a bit of the 40's 