"Mass finishing methods, especially drag finishing, create perfect, blemish-free surface finishes with Ra [surface roughness] values of less than 1 microinch
(i.e., knee femorals, femoral heads, the inside of acetabular cups)."
A typical 600-grit abrasive can produce a 6-10 microinch
Ra (0.15 to 0.25 [micro]m) finish in a reamed barrel blank.
The finish is approximately 16 microinch
After electropolishing, the grinding marks are reduced substantially, though still evident.
With regard to the surface roughness (Ra) of the interior surfaces, a roughness value of Ra [less than or equal to] 0.8 pm (32 microinch
) has become standard.
Screw mounting ensures secure installations and 30 microinch
gold-plated contacts provide reliable connections with repeated mating cycles.
All wetted plastics and elastomers (G 1-1/4 version only) are compliant with 21CFR177, and all wetted surfaces have a 16 microinch
(0.4 micrometer) Ra finish.
system uses the microinch
as a basis of measuring surface finish.
Moreover, the structure should be designed to control vibration typically in the 1,000 microinch
or lower range.
With the newer combination immersion golds, the first microinch
is the traditional replacement/immersion type.
I opened the olde leaded PVCcoated window frame a microinch
and squinted skywards to check the atmosphere for any stray anthrax spores (thought to be released under safe test conditions by British boffins circa 1946 on the now uninhabited Isle of Eiggnoig in the Slightly Inner Hebrides).
Cold plating on the leads, base and ceramic is 50 microinches
minimum with a 100 to 350 microinch
In data set 1, Timken again fared well in its comparison with NIST in that the difference from NIST in its measure of variance on any given block was within [+ or -]0.42 microinch
. For three of the ten blocks in this set, the difference in variance between Timken and NIST was statistically significant at the p [less than or equal to] 0.05 level.