blasting surface roughness
blasting surface roughness
(OP)
Hi all,
is there any tolerance for blasting surface roughness?. in this case the acceptance criteria is 50 - 100 micron, but what we achieved on site is 180 micron. is it still acceptable or any problem that may be occurred if there is excessive lasting surface roughness?. appreciate the advice.
is there any tolerance for blasting surface roughness?. in this case the acceptance criteria is 50 - 100 micron, but what we achieved on site is 180 micron. is it still acceptable or any problem that may be occurred if there is excessive lasting surface roughness?. appreciate the advice.
RE: blasting surface roughness
RE: blasting surface roughness
High peak, mean of 10 peak, etc over a small surface should be measured if you can't afford scanning the entire blasted surface to check its quality before applying coating.
If the surface preparation is crap, your coating won't last.
Remember: garbage in(side), garbage out(side).
* Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?
RE: blasting surface roughness
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: blasting surface roughness
Years ago I almost got in fist-fights with machinists that couldn't PROVE that surface roughness requirements for their work was or wasn't being met. I purchased a set of surface 'scratch' comparators from the following company. There are comparators for machined surfaces [of many types]… of course... for shot-blasted and grit-blasted surfaces. This set of comparators was a come-to-Jesus moment for these guys... and displays various aspects/conditions of 'surface roughness, waviness and lay'. Many young engineers borrow them for shop floor use and also their own personal education.
NOTE. This is NOT a product/company endorsement... simply my experience/usage.
Surface Roughness Comparators [made to comply with ASME B46.1] shown are available from GAR Electroforming Division, Electroformers Inc, P.O. Box
340, Danbury, CT 06813.
NOTE. I'm pretty certain that these comparators are available in metric [SI] units-of-measurement, also. They aren't cheap... but they can be priceless in arguments!
a. Use the S-22 Conventional Machining Microfinish Comparator to evaluate machined surface finish quality (general
purpose).
b. Use the G-63 Cylindrical Turned Microfinish Comparator to evaluate lathe-turned and hole surface finish quality (general purpose).
c. Use the G-6 Grit-Blast Microfinish Comparator to evaluate grit-blasted surface finish quality (general purpose).
d. Use the SH-6 Shot-Blast Microfinish Comparator to evaluate shot or bead-blasted surface finish quality (general purpose).
e. Use the M-15 Master Visual-Tactual Set to evaluate and compare machined surfaces produced by various machining
methods (precision evaluation of surfaces falling within a narrow-range of fine finishes).
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation, Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]