I’ve been going back to the basics of the whole feeds and speeds thing for a minute, and this time I want to focus on chipload values only, not the infinite number of associated RPM/feed combinations.
I collected a small sample of feeds and speeds below from:
- usual recommand values from 3 or 4 different web sites
- what CarbideCreate uses
- the Shapeoko feeds and speeds chart for the #201, 1/4" endmills
- Will’s [Tableau]
- (EDITED) Winston’s Material Monday videos
and converted them back into chipload values, which gave me these values (in inches):
|Source||MDF||Hard wood||Soft wood||Acrylic||Aluminium|
|1/16"||average web recommand.||0.007||0.006||0.007||0.005||0.005|
|1/8"||average web recommand.||0.055||0.039||0.043||0.030||0.035|
|Will’s Tableau / Nomad values||0.094||0.031||0.079||0.024||0.004|
|1/4"||average web recommand.||0.146||0.098||0.118||0.079||0.059|
Several things surprised me:
- The shapeoko chart and CarbideCreate default values are different? (for 1/4")
- I know that most of the chipload recommandations out there on the web are for (much) more rigid machines, yet the Shapeoko chiploads for 1/4" endmills are 5 to 10x smaller ?
- for 1/8", the factor between the web and CC is smaller
- for 1/8", the Nomad values are much higher than what CC recommands for a shapeoko ??
- and for 1/16", CC uses chiploads that are twice as large as usual recommanded values