Hi guys I’m new to this group. So please forgive me if I’m posting or asking in the wrong place.
I have been machine for some time but I work with Aluminum since I started machining.
Now I got the opportunity to work with some 304 SS. I need to mill a packet .500 deep and 2.000 round. I’m planning to predrill 1/2 hole so the 1/2 inch 4 flute End Mill can get inside and start cutting at full depth but I have not idea what feed/speed/steep over or sfm to use can any one advise me please.
Thank you so much guys.
Welcome!
All of your feeds and speeds are tool and machine dependent. i would contact your tool supplier and get the correct numbers for your application. most suppliers are extremely helpful in giving you the best speeds and feeds for your needs.
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@ArnoldAvilez I do agree with @BenjaminLorson contacting our tool rep . I also know I do not have a tool rep. so here is my recommendation.
Drill the start hole 5/8 dia to clear the .5 mill use a peck drilling cycle with the mill to cut to depth.
depending on your tolerance on the depth ??? I would cut the pocket at full depth “you will have to ensure the tool dose not pull out of the holder” If using a carbide mill that is coated try 225SFM and .0015 to .002FPT with a step over of .025 using a spiral tool path. You can leave some stock .01 on the 2"DIA for a finish pass. keep in mind if you have to take a finish pass on the bottom of the pocket be careful you leave plenty .05 because your tool will tent to burn up on the end. Use plenty of coolant also. If you can avoid leaving stock on the bottom would be best! This is just a starting point you may have to adjust for the machine and tooling you have.
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Thank you that is very helpful!
I too don have a tool rep. I’m not big enough to have one.
By tool rep, i generally mean the manufacturer of the tool. you can call or email the manuf. of your cutter and they will likely help you out.
Thank man!
I’m cutting right now at 840 RPM, 12 IPM .500 depth at .05 step over and is cutting very well.
I fallow your suggestion.
Again thank you for the info.
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You’re welcome. i have a .500" endmill from sgs kyocera that i run in stainless at 2600rpm 23ipm at a .200 stepover and .500 doc. there are some pretty radical cutters on the market if needed.