'72 CB350 K4 - 'ol no.7 - Swingarm progress

This bike is gonna be insane Bob! Keep up the good work. Any idea when it will be done for the season?


Wait a minute......I have a banner very similar to that in my garage....... :)
 
I like it, though I wonder if you need the brace to sit so low. I doubt there would be any clearance issues or anything, but from a pure looks standpoint, Id like to see it closer to the swinger. Maybe something like this? (sorry for the crappy hand drawn sketch)

bW1jMS9EQ0lNLzEwMExHRENGL0ltYWdlMDIxODIwMTExNDUwMzMuanBn.jpg


Should still provide more than enough reinforcing, but would just look a bit sleeker IMO.
 
Rich - Thanks dude, hopefully she'll be a ripper. Dont have a real date for completion, but my laundry list is slowly thinning. Right now I have a lot of time to work on the bike due to being out of a job, but have to rely on selling stuff on eBay and Craigslist in order to fund parts. This has been working really really well for me so far but I'm running out of shit to get rid of. Hopefully a job comes through sometime soon so I can wrap it up.

Mike - I was thinking along those lines too when i got started, but doing research it looks like the "pro's" are making it a bit more extreme. My assumption is that is has to do with that 90° angle where the bracing meet for ideal triangluating. Right now thw acute angle is 28° but with my chain clearance i think i can drop it down a few degrees and still keep the 90. I'll play around with it more and see what i can do.

Did that make any sense??

bob.
 
Yup. And I hear ya. I was thinkin' out loud. Im sure you'll make it right, and drawings rarely look as nice as the actual part once finished anyhow.
 
Plenty of jobs here in the western side. Have an industrial size death wish? We are hiring where I work!
 
The bamboo flooring is so cool. That's such a good idea... I've been trying to figure out what to do for a workbench in my garage and now I think I know :)

Progress on the bike looks great!
 
thanks Greg! Look on Craigslist under "Materials" and search bamboo flooring. I had to drive about 40 minutes away but I got it for 50 cents a square foot from a flooring center's "scrap" pallet. Ended up getting three matching boxes (70 sq/ft) for $35. I've still got a box and a half left to make more benches with, it's perfect for this kind of work.

bob.
 
I ended up at work today so I couldnt swing by, but maybe tomorrow?
I would be bringing bits and pieces of the kawi with me if so.
Peg board looks sweet. Really coming together in there sir!
 
yea dude, I should be here all day. If not, I'll be in the school shop late afternoon turning the rest of the bushings and threading the swingarm axle. Give me a ring.

bob.
 
You and Leigh not living in the same home makes me sad. I guess thats all. The bike shall be rad Im sure.
 
The Red Wonder said:
Nice lookin work man! What are those used for? Swingarm?
Click to expand...

Yes sir, and thanks! I've got a bunch of left-over 6061 stock so I'm planning on turning some custom bar ends and other doo-dads as well with it.

bob.
 
Bobdot said:
Yes sir, and thanks! I've got a bunch of left-over 6061 stock so I'm planning on turning some custom bar ends and other doo-dads as well with it.

bob.
Click to expand...

Very cool! I am doing something extremely similar for mine. What are you using for the pivot/ long bolt? I'm sure you know this, but to properly ride on needle bearings and not wear out quickly, what ever it is, it will need to be HARD, Rc 58 at least to be exact.

I am going to make little sleeves like you did for the needle bearings as well, but I might make them out of a hard nylon or delrin so that the face will be a bushing against the frame as the swingarm pivots. Then the riding inside the needle bearings are precision ground hardened sleeves sold by the same manufacturer. I will have to make a steel sleeve to slid in to that so that I can use the stock bolt. It sounds complicated, but once I get the bearings in (tomorrow!!) and make everything, it will make sense. Nice work on the lathe by the way!
 
I understand completely, sounds like you have a rock solid plan.

My plan for the axle is to use O1 oil hardened tool steel that is rated at Rockwell B89-96. Think thats up for the task? I'm threading it at both ends and putting 1/2" slotted nuts with cotter pins to lock it in place. More on that in the next couple of days...

The stock swingarm set-up on my bike has plastic/rubber spacers that seperate the swingarm from the frame and swingarm mounts. I made these bad boys to the same spec as the stock bushings so I can use the stock spacers. I'll take plenty of pictures when its all coming together to explain more clearly.

bob.
 
Sounds like you've got it all covered. With the O1 tool steel, just know that you have to harden it afterwards, and those numbers are quite high compared to what I have seen O1 hardened to. I looked in to getting a few small parts hardened, like sleeves for this same kind of set up, but for the cam shaft, and it was $75! Thats why I went the way I did. If you are buying the tool steel already hardened, don't count on threading it or machining it at all, its already as hard, if not harder than the tools you would be cutting it with. Just something to consider.
 
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