Thank your for your kind comments gentlemen.
All the packages were mailed Monday, so everyone who is receiving theirs direct should see it by Saturday. Powder Keg, you are the exception. The post office decided that yours should be a First class package and not first class mail. They returned it for additional postage. I think the parts stacked up on each other and made it too thick. It was re-mailed this morning,Thursday, so you will probably get it next Monday.
I feel bad because I had the easy parts. I never polish except enough to remove the machine marks, and only then if it shows. My parts are mostly hidden so they only got a hint of polishing. I am not good at it so I think that my engines look better with a clean satin finish rather than a poor polish job. This engine surely will be the best polished one in my display case. When the team build was first discussed I would have expected the parts to be machined and only rough polished, not the quality of work that everyone is displaying.
Tim, I made the crankshaft at 0.1868 diameter nominal. That would leave 0.0007 inch clearance if the bearing holes were spot on, but of course they never are. I normally like to have about 0.0010 to 0.0015 clearance on plain bearings unless they are hardened and lapped, so I set them a little tighter in case the reamer used on the bearings ran a little bit over. Most reamers in brass cut a few tenths over. I figured that if they were a little tight because the reamer was cutting the right size or a little bit under then everyone would do just as you did and polish one or the other until they fit.
The team build is interesting as it compares to what happens in the commercial world where there may be 10 parts being made by 10 different vendors. However, in the commercial world the drawings would have tolerances for all the dimensions, and if the parts are made to print then the parts will fit. Hobby drawings rarely have tolerances and only a nominal size is dimensioned. The hobby machinist is expected to adjust the sizes to make the parts fit on an individual basis. I think hat we can expect to make a few adjustments as we assemble the engines. Most of this will be due to the nature of the drawings. I doubt that there will be ANY problems due to workmanship.
Congratulations to everyone involved as this all comes together. In particular congratulations to Brass Machine and Tin Falcon for doing the administrative work necessary for this to happen. And finally as we are each doing our individual assembling, keep Mike in mind. I am only here to to help Mike out, not to replace him. After all, nobody can replace Mike.
Am I correct in my thinking that everyone will post photos of their finished engines here? I hope so.
Gail in NM, USA
The later it gets the more long winded I become. Sorry.