MR2 Feeds/Speeds differ from MR4???

[ilya]

I have a very wierd problem. I've made some toolpaths in MR2 and it calculated speeds and feeds that seemed very reasonable (I was cutting plastic, used the material called "Plastic - ABS"; the tool was 6.2mm 2-flute HSS endmill; calculated RPM turned out to be approx. 9000, feed - approx. 1500mm/min). I've made some actual cutting and everything worked fine.
So far so good.
Now, the same part and the same tool, but loaded in MR4, give me the following: speed 2300 RPM, feed 370 mm/min. I do NOT change tool parameters! I just recalculated the speeds (that is, selected the tool).

Can anybody explain me what's going on there?

[Superman]

Are your settings in MR4 the same as MR2 in the operation manager's "Machine group properties", "Tool Settings" page ?

ie feed calcualtion "From tool" checked ON ??
this is the area that controls that issue

[ilya]

I always check "From material" on that page, because I want the program to calculate feeds and speeds based on the material. The particular material (Plastic - ABS) has identical settings in both MR2 and MR4

[brandou10l]

goto the box where you select your material and right click on the material you select and click on edit matl and change the sfm to a higher number and that will make the rpm calculation higher and the feed rate can be edited too if needed, when ur done save the matl to the library