Brian Jackson
09-30-2004, 10:36 AM
Hello all.
Gotta question about paint thickness on a square tube airframe... think "automotive multicoat". Normally this would be irrelevant. However, in the case of the GyroBee it could be a potential problem for hole tolerances. Here's why:
The keel and tail boom overlap by several inches, and are held together by the cluster plates. When the holes for these are drilled and reamed, the material is bare aluminum, probably clamped together to ensure a perfect fit. Later when the material is painted, the paint finish build-up increases the distance between the keel and tail boom by twice the finish thickness, thus the cluster plate holes will now be misaligned by that distance. See what I'm getting at?
I would like to compensate for this finish build-up during the drilling process, but I do not know how many thousandths of an inch to allow for paint. Does anyone here know or have access to this paint thickness data? Granted it's a function of the type of finish being used, but if someone could point me in the right direction I'd be grateful.
Thank you.
Brian Jackson
Gotta question about paint thickness on a square tube airframe... think "automotive multicoat". Normally this would be irrelevant. However, in the case of the GyroBee it could be a potential problem for hole tolerances. Here's why:
The keel and tail boom overlap by several inches, and are held together by the cluster plates. When the holes for these are drilled and reamed, the material is bare aluminum, probably clamped together to ensure a perfect fit. Later when the material is painted, the paint finish build-up increases the distance between the keel and tail boom by twice the finish thickness, thus the cluster plate holes will now be misaligned by that distance. See what I'm getting at?
I would like to compensate for this finish build-up during the drilling process, but I do not know how many thousandths of an inch to allow for paint. Does anyone here know or have access to this paint thickness data? Granted it's a function of the type of finish being used, but if someone could point me in the right direction I'd be grateful.
Thank you.
Brian Jackson