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Resolved... The consensus is that SS parts in the polished or smooth grained conditioned (shiny and bright vinyl covered #2 for example) that get covered by clear powder have no business at all running through any powder coat pre wash process.... period. If they did they would have to be wiped...

304 SS sheets, vinyl covered, #4 brushed, vinyl is stripped parts wiped with MEK type cleaners, run through typical powder coat wash cycle. They come of the wash cycle with streaks and drip marks (scum, light whitish) that bake on if allowed to run through heat dry cycle. Next we want a clear...

Photo 1 http://i258.photobucket.com/albums/hh265/DavidAldridge/IMAG0192-1.jpg Photo 2 http://i258.photobucket.com/albums/hh265/DavidAldridge/IMAG0193-1.jpg

This is a continuation of thread (now closed) thread281-283298 my ultimate question.... unless someone has a machining related solution... will heat treat help this? working with 6061 T6 Bar stock 3/4"x3" During the last runs 6 months age we had copper contaminated coolant, since then we have...

We probably do have 'so much' CU.... the coolant doesn't dry and puddle or contract into drops - the parts stay oily. but if you leave the parts setting wet for a day they turn dirty rainbow colors and places where the coolant was wiped off with fingers from handling remain relatively shiny...

@Saberblue... I have thought about chip re-welding and smearing. the pattern roughly follows the mottle pattern that exists in the raw aluminum stock itself - I figure the moon crater is associated with this somehow. Also, after about 1/4" you machine through this 'crater' zone altogether. The...

The moon crater thing is very interesting - very hard for some people to even see it. It turns out that cratering doesn't impact the final appearance of the hard black anodize .... IF .... huge if, if the coolant is cleaned off the parts immediately after machining. We had 100's of parts that...

Both passes are climb cuts. A test piece was machined, the material was taken down in .050" steps, 5 passes total each with a .045" rough cut and a .005" final pass. rough cut 50 ipm and the 005" final pass 30 ipm. both passes 4200 rpm. we are using a 2" carbide 4 bit inserts. this supposedly...

Yes the bottom and side are being machined in one pass. The part is 2-1/2” wide and 10” long, the top surface is roughly split in half running the long way with an approximate .100” step down. So roughly 1-1/4” wide by 10” long, 2 sides, 1 side about .100” lower. The first cut (top surface)...

.... also it appears that the moon cratering occurs more often where the cutting tool is cutting perpindicular to the grain of the extrusion. I just noticed this - we have one surface where the 4 bit cutter which is about 2" in diameter is cutting a 1" wide step down, so basically the cutter...

@Btrueblood you mention "slow the F down" do you mean slow the "feed" down or the "F%&^" ... as in a swear word, which is kind of the same thing? The moon crater spackle look doesn't look like smeared cheese either - the pattern doesnt' follow the mill cut direction - fact is, if it had...

How fast 'is' fast... good question - I will get these numbers tomorrow Wednesday.

Ductile Rupture - I think I like the sound of that :0 It sure makes sense - we have plenty of coolant, new sharp tooling and we do cut fast... fast... to get the nice shiney surface. Thanks for the tip David A.

Hi, first off - I am not a machinest. I am quality guy trying to chase down an answer. from what my machinest tells me, we are doing this right... here are the details. Extruded 6061 T6 Aluminum 3/4"x2-1/2" stock basically machined to a block shape, lots of flat shiny surfaces. Approximately...