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Posted by clay on July 17, 2006, 10:35 am
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John,
316 does not take to well with shallow cuts, for high finishes.
Normally you will need to take a deeper cut. At least .003" with
carbide, maybe more. You might have better success with HSS or cobalt tools.
Did you know that you can buy SS plate pre-polished? I am not sure 316
sheet is available that way, but is certainly worth looking at.
ca
John wrote:
> BottleBob wrote:
>
>>John wrote:
>>
>>>I am about to try to get a 16 finish for electroplate on 316 sst.
>>>3/16 thick plate. So far I have machined 1" x 6" strip to be cut
>>>into 1" squares where I used a fly cutter which I sanded and buffed
>>>that worked ok. The larger plate I am sure will be difficult so I am
>>>asking for some pointers please.
>>
>>
>>John:
>>
>>The easiest thing to do is what Charlie said. Have it double disk
>>ground and then lapped. But if you MUST do it inhouse some things you
>>might try are surface grinding it (blocking it and flipping it
>>repeatedly to try to achieve flatness). You could try using some
>>double back tape to hold it down while machining (holding it in a
>>vise will tend to bow a 4" piece that is only 3/16" thick). You
>>could clamp it to the table and machine half of it then move the
>>clamps and machine the other half. Sometimes a large flycutter will
>>impart enough heat into the part to bow it, one way around that is to
>>use a smaller cutter with multiple passes.
>>Anyway, those are just a few options to try.
>
>
> Thanks guys.
>
> I should have gotten back sooner. I only need one side to have the finish.
> The other side will remain uncut. Flatness and thickness is not a concert
> either. The problem I have is the flycutting. I cut 4 pieces that were 2 "
> square and that took several tries at about a few thousands each pass. I
> hone a single point carbide(of coarse) bit w/.030 R and try various RPMs and
> feed with as small a cut as possible. Just enough to clean it up. I try oil
> and tried Kool Mist. The first piece went fine then everything went down
> hill from there. I now have far less fingernails then I started out with
> from lapping. They have not bowed what-so-ever and only get hot when I use a
> Scotch Bright wheel for buffing. They look nice but I am feared when the
> electrofinsh is applied I will see what is not visible as of yet. All the
> fine lines and scratches will most likely shine like a babies ass.
>
>
>
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> plate. So far I have machined 1" x 6" strip to be cut into 1" squares where
> I used a fly cutter which I sanded and buffed that worked ok. The larger
> plate I am sure will be difficult so I am asking for some pointers please.
>
> TIA
> John