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G-Wizard's feeds and speeds numbers for indexable endmills and face mills seem low to me.

Answered Closed

 I have a question relating to the indexable end or facemill recommendations. I am currently working with some H13 tool steel, annealed A-2, and I am using a 1.5″ diameter, 2 insert, facemill. It has a 3/4″ arbor that I have installed into a collet chuck. It is made by Valenite and uses 2 triangular negative rake inserts. I was facing a piece of steel about 3″ by 2″ and wanted to remove .100″ on the first cut. I input the specs into G Wizard and it churns out a rpm of 641 and a feed of 9.467 when set to “rigid” and full “Rabbit”. This is the first time I have machined this material but those numbers seem pretty low on rpm to me? I tried it and it sounded like it was going to break something if I didn’t quit, so I did. I tried a .050″ cut depth and G Wizard showed the same required rpm and feed-rate. It was better but still seemed to not be right, meaning a very noisy “chomping” noise during the cut. I finally ended up at 3000 rpm at 12 ipm with trial and error and it sounds “smooth” and looks good. What am I missing in this equation? I have had decent results so far using G Wizard with traditional carbide endmills but this threw me for a loop.

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Best Answer

The indexable tooling is the most valuable time to use the Manufacturer’s Data with G-Wizard. The reason is that there are so many different insert types, yet GW, absent any other information, has to boil them all down to one choice. That one choice is workable, but it’s not optimal. Here is a post on how to use Manufacturer’s Data:

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