Milling with bottom of endmill.

[Walid Naim]

Can anybody give me any tips or maybe some good feeds and speeds for milling a good finish with the bottom side of an endmill.  Im working with D2 steel and 3/4 endmill. 

[crazy^millman]

Look to a wiper style endmill if you are looking for a better finish. Standard endmills can only do so much. Depending on the finished keep the feed per flute to .0015/.002 then the sped will come back to the recommend SFM for the endmill you are using. If uncoated one speed related to about 80 sfm if coasted then going to come down to that specific manufacture of that endmill and what they recommend for that tool to know what is the range of SFM to use. Then you can come up with the speed. 

Here is some idea of different types of endmills from one company and the related speeds and feeds they recommend depending on the endmill.

Helical HEV7

Helical HXF

Helical HEV6

Helical HEV5

Helical HEV4

That is just one manufacture and one series of endmill ranging from 4-12 flute for cutting Stainless Steel.

Then we can get really crazy with the number of teeth to 20 like this Iscar and really go crazy if you want to get a superior finish.

20 Flute Iscar

 

 

[FROZEN]

Do you need sharp corners? If not use a bull noise endmill with a .03 corner radii. Try the machining advisor pro from Harvey Tools. I have had great luck using feeds and speeds on 17-4.

https://www.harveyperformance.com/machining-advisor-pro/

 

 

[JB7280]

4 hours ago, FROZEN said:

Do you need sharp corners? If not use a bull noise endmill with a .03 corner radii. Try the machining advisor pro from Harvey Tools. I have had great luck using feeds and speeds on 17-4.

https://www.harveyperformance.com/machining-advisor-pro/

 

 

I've always had issues with using MAP for a "facing" type operation.  Maybe I'm doing something wrong, but if I change the RDOC and ADOC to something more like what I'm doing(large RDOC, small ADOC), it wants to change the cutting method to slotting.