Brad Gover
Involved In Discussions
Hi all, my company Silicon Carbide Coats pure graphite. we put parts in our furnace and coat the insides of long tubes. What we have been doing to determine the coating thickness is to first measure the ID before and after coating. Our inspector then substracts the diameters and records that value as our coating thickness. Our application engineers (bless their little hearts) have told one of our customers we can garrentee a minimum thickness of 0.0015" of coating. Our customer bit the bait and now asks up for our measurement error. We did a gage R&R on the bore mic. My question is if we are using two measured point values and doing a substraction to determine the coating thickness, our upper bound uncertainty limit would be the 0.0015" + 2(5.15 * total gage error standard deviation). I am thinking that using a multiplier of 2 for two measured points instead of 1. This new limit would be the coating thickness that if we were that or thicker we could garrentee the customer that we meet the specification of minimum coating thickness of 0.015". Any thoughts?
Thanks, Brad.
P.S., Hi Bev!
Thanks, Brad.
P.S., Hi Bev!