Seq of operation
Seq of operation
(OP)
Al Extrusion need some presiding drilling and anodizing. What's best sequence. Drilling or anodizing ?
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RE: Seq of operation
RE: Seq of operation
TTFN
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RE: Seq of operation
isn't the question whether or not you want to anodize the bore of the hole ?
if a 0.001" or two of anodize deposit in the bore of the hole affects your precision, then account for it in the hole diamater.
if your precision is so tight, what'll happen inservice when the anodize wears off ??
RE: Seq of operation
RE: Seq of operation
RE: Seq of operation
thanks for responding. from that it appears to be no problem to anodize at thd end od sequesnce..
RE: Seq of operation
did you think anodizing would distort the part ?
RE: Seq of operation
RE: Seq of operation
I am actually concerned if the anodizing can leave much thicker deposits like sometimes it happens in powder coating.
RE: Seq of operation
RE: Seq of operation
Is it right that during the process they immerse the entire extrusion into a chemical tank?
RE: Seq of operation
run a test part thru anodize.measure before, then after.
the thickness of anodize will result in half penetration & half buildup.
so if the hole requires .001" anodize per surface".002 total" there will be approximate
.001 build up on the diameters., in other words the diameter will be .001" smaller after anodize.
the reason to measure before & after as RB 1957 suggest, the anodize will plate less in
recesses, holes, & so on. so there may be less build up in these areas.
anodize adds to protection for wear, & helps the base material.
this part is very liberal far as tolerance, and should be no issues.
Good Luck
Mfgenggear
RE: Seq of operation
Generally as rule of thumb is if the tolerance is less then .001" tolerance then it has to be machined after. IE chase theads, hone or ream holes.
or like said above mask off less plate.
Mfgenggear
RE: Seq of operation
Say you do want the holes free of anodize.
Do you really care if they get drilled before anodize and masked, or made after anodize?
Generally the answer is a resounding 'no'.
In which case just put a note on the drawing 'HOLES SHALL BE FREE OF ANODIZE'. Then the machine shop & plating shop can decide which order works best for them - I've had parts done both ways for various reasons.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?