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| Sorting out accuracy on my Mill/Lathe |
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| NickG:
DJH, looks good to me. For aluminium, if using HSS which I do at the moment (have asked father christmas for some carbide tipped tools to try though!) you need a high rake angle becuase the metal is soft and swarf comes off in long strings. Most of the stuff I've seen say about 40 degrees top rake for aluminium, about 20 for steel and about 2 for brass / cast iron. The other angles are just to clear the work to ensure no rubbing. Of course getting it on centre height is critical, there are other posts on here to show how to do that. I usually try to put a very small radius on because most stuff we do requires getting the tool into corners, unless I specifically need a radius to suit a certain feature. The smaller radius also gives less rubbing of the workpiece but go too sharp and you will get a ridged finish, you need something on there. Nick |
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