Need Help! Recommend a mill bit please.......

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Thread: Recommend a mill bit please.......

  1. #1
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    Default Recommend a mill bit please.......

    Hello

    I am searching for the proper type of mill bit to most efficiently perform a profile operation on 6061 aluminum.
    Said job is as follows; Stock measures;1.5" x 3". It's a profile operation with a cutting depth of -1.5". I need to make 20(ea) of them

    My initial thoughts are to run an .5" end mill around the profile to -1.5" depth then perform the same operation using a .1875 end mill to remove the remaining material. The way I see it, load on the end mill will primarily be in the -z direction. I'm thinking 2 flute HSS. Down cut? Thanks to all who respond.

    Jerry

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  2. #2
    Community Moderator Jim Dawson's Avatar
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    Default Re: Recommend a mill bit please.......

    It really depends on your machine. I would use a 3 flute, 1/2'' aluminum rougher to remove as much material as possible. Use an adaptive clearing cutting strategy, if your machine will take it, DOC should be about 3/4'' for the roughing passes.

    Do not use a down cut bit, you need to clear the chips. Flood coolant would be the best, but a good spray mist would work.

    Most of the load on the tool is radial, not axial.

    Pre-drill where the 0.093 radii will be to reduce the cutting load on the 3/16 endmill in the corners. If possible, make the radii at least 0.100 to reduce the contact area of the 3/16 endmill as it cuts into the corners. 1.5'' is a large DOC for a 3/16 endmill, I would use an endmill with a relieved shank and about 1/4 inch of cutting length, then spiral down for the finish passes.

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: Recommend a mill bit please.......

    Hi Jim

    Thanks for the advice!

    Jerry



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Recommend a mill bit please.......

Recommend a mill bit please.......