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zwelsh91
in reply to: Anonymous

I was just trying to optimize the originally posted operations. In general, yes, using a finish pass would be a little bit cleaner in the way of number of toolpaths. I will sometimes use a second operation like the originally posted Rest Machining op so that if there are tight tolerance elements needing close attention, I can add an additional offset to the same tool for example: T0151 (Tool 1 with a tool offset of 51) to be able to adjust the tools offset for that operation only. Or even add a second tool or the same reasons, that way the second tool is only doing the finish work.

 

On the speed and feed end of things, like I stated before the speeds and feeds are fairly conservative. In general the only thing I usually change for finish passes is the feed rather than the speed. I have no manufacturers tooling information to go off of to determine what speeds and feeds are appropriate for the tool you are planning on using. I use the imperial system rather than metric on a regular basis. That being said for super general spindle speeds and feeds: 1018 CRS bar CSS 400-600 sfm .007-.012ipr roughing feed .03-.120 doc depending on the diameter and stick out. finishing .0035-.005 ipr same spindle speed. For aluminum 800-2200 sfm and the same feed. factors i left out are tool nose radius and chip breaker, they both will drive your steop-overs and feeds.

 

Speeds and feeds depend on many factors like: Material (work piece and tooling), axial stick out of the material, diameter of work piece. etc. not to mention the geometry and design og the cutting tool you are using for the job, the cutting tools geometry has just as much if not more effect on the speeds and feeds as the physical conditions of the workholding and work piece material.

Zak Welsh
Zakary Welsh Machine LLC