Tuesday, July 19, 2011

Ok, how about a post that's NOT welding?

You asked, I listened.
I get thousands of emails every day asking for more motorcycle-progress pics.
I can see how the welding stuff may be a little boring for some of you...

One of my first "real" welding projects was to build an "engine cradle." -That's what I call it anyway...




I built this so I could position the engine exactly where it needs to be in relation to the frame. The sprockets are perfectly lined up, the engine is level, and centered. The 3 bolts are to make fine adjustments. I think it may have to move toward the front wheel slightly, but from side to side, it's right on.
All you sharp-eyed viewers will notice 2 things... One, that's a HUGE counter-shaft sprocket on that thing! Yes, and it's custom. PBI made it, and it's really 18 tooth. There is a matching 42 tooth on the rear that a company called "Rebel Gears" made me. I had to go custom on the sprockets because of the rear hub/wheel combo. I'm using dirt bike wheel parts, and dirt bikes use very large rear sprockets. Plus, the fact that the rear wheel is 21 inch (!!) that plays a part also. SO, in order for me to get back in the ball park with the final drive ratio, I had to come up with a front/rear sprocket combo that would do that. The SMALLEST rear sprocket I can get is a 42 tooth. (without machining away some of the bolt shoulders in the hub... and I didn't want to do that) So in order to be somewhat close to the stock gearing, I needed an 18 tooth front. -Rebel gears again. They hooked up the PBI.

The second thing to notice in the photo is the nice, shiny silver patch on the case below the sprocket. This is what raw aluminum looks like. I'm glad to know that the brown, "gas stained" clear coat will come off with a little paint stripper and elbow grease.

So, now we're looking like this:



The drawing on the wall behind the bike is new as well... It keeps morphing into more detail, but I think I'm set on the final design/measurements. I have the "plates" that will bolt the engine to the frame tubes drawn out and those will be made out of aluminum... .375" for the rear plates and .25" for the front/top. I may have a lead on a guy here in town with a laser cutting machine, but if he doesn't work out, there's a water-jet company in Cali with no minimum charge on cutting. Hopefully I can keep it all as local as I can.

So what's next? Probably ordering my frame tube steel, and I think ol' Santy may come a little early this year... One of the little elves mentioned something about a drill press with a cross-slide vise. That would be about as close to a milling machine as I'd ever get, and a VERY nice Christmas present.
As usual, if you can hang on, I'll have more...
I promise.

1 comment:

  1. Dan, if you send me a drawing of the aluminum pieces, I can have the model shop here make them for you! I know Chicago isn't "local", but it would be free. Let me know.

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