the chart, especially endmills of lower diameter have the problem the max of 30000 rpm of the makita is way to slow (1/16' dia and vc=500m/min → 100k rpm). However, this is a 1/4' end mill… so wrt. This seems fast, but you can adress the cutting force and load on the mill by reducing the cutting depth/vertical infeed (yesterday I used 10mm plunge/cutting depth and 1.5mm infeed). But ok, maybe its a really special endmill I dont know… or am I missing something?īut in general I’m sorry, I dont agree with you Grant : The sienci 1/4' 2flute upcut endmill (the one I got from the early bird starter set) cuts really nice in oak with vc=500 m/min → 25000 rpm → level5 on the makita, and chip load of 0.04mm (chart says 0.055) ->xy-feed=2000 mm/min. These values correspond to a cutting speed of ~6m/min, which is a ~1/15 of the cutting speed needed for steel. Wow 1200 rpm sounds painfull slow for a diameter of 1/16'.

I must admit that I do not understand the concept of pitch per teeth per rev. I’m likely reducing the life expectancy of my bits as a Thanks for the chart. There are lots of chip load charts available, but I don’t find most of them particularly useful as I am using a Makita router and it does not go slow enough to bring the recommendations in the charts into play. Acrylic and solid surface material (corian) cut nicely, but you need both slow feeds and slow speeds to prevent the material from melting. Plywood is terrible on bits owing to the glue between the plys. MDF cuts quite easily, but is tough on bits, owing to the high binder content. For example, you can move faster in softwood than in hard woods.

You will need to vary both your speeds and feeds relative to the material you are cutting.

One thing that I should have remarked on was your reference to material. I tend to listen to how bits are cutting and reduce or increase feed accordingly. It’s true that running too fast can cause heat build up.

Vectric forum large bit speeds