Re: disc brake conversions

Posted by Mike Dowd On 2012/4/28 8:20:35

I'll take a look at those inside corners...I think they have a slight radius but I'll make sure. When I was a young Test Engineer for Pratt and Whitney I was given the task of determining why an Exhaust Nozzle Control heat shield was cracking...well...it was obvious even to me as a new engineer that there was NO radius on an inside corner...none called out on the drawing and none on the part. It cracked!!

Later in life my neighbor said his Roto-tiller wouldn't start. Ultimately I had to look inside the engine to get to the problem. The camshaft and drive gear were a single casting and there was once again NO radius in the cam-to-gear mating area. It cracked!!

So, a word to the wise should be sufficient as even folks who should know better design and build parts that have problems built-in.