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Hi all, haven't posted in awhile, been busy with non-model engine projects. One of those has been making custom muzzle brakes and compensators out of 6/4 gr. 5 Ti, of which I have a decent amount, and it occurred to me that it might be kinda interesting to use it for crank and rod in a small...

It is dubbed AR-7.5, a 50% scale AR-15. I give you my partial build as it sits now, nearing the close of week 3 and after about 75-80 hours of machine and finishing work: That is a normal 5.56 size AR receiver on top. Don't know how many we have here who are familiar with the...

So, although I have a fair amount of experience in manufacturing, I'm still very new to the world of model engine building. As such, this is not going to be a runner, but just something fun to put together that offers proof of concept, machining experience and an opportunity to learn what works...

Hi! Been lurking a bit, checking out some of the awesome builds here, decided I may as well join. Haven't built an engine yet, but I did cut my teeth on my first crankshaft last night. Not for a running engine (especially at only 2" long/.490 diameter with .080" main journals and .154" rod...