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Author Topic: New CB350 Project - Back Breaker  (Read 31137 times)

Offline tWistedWheelz

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Re: New CB350 Project - Ball Breaker
« Reply #20 on: Jan 27, 2011, 13:08:28 »
I am aware of the factory construction of stamped steel on the backbone and stamped steel that forms the neck of a Honda CB350 Mike, and if you read my post you will see where I offered the advise to remove all of that and replace it with steel tube to make it stronger than even the stock one would be, which does really need the reinforcement of a stronger backbone once you convert to a rigid design. I think Dave has enough info here to make an educated decision and further discussion is just unnecessary. He apparently is a skilled fabricator and has an understanding of what is needed. I am sure he is a reasonable man and will work well with the help of suggestion from others who have offered him the suggestions.
« Last Edit: Jan 27, 2011, 13:12:40 by tWistedWheelz »

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #21 on: Jan 27, 2011, 13:38:41 »
Thanks Brandon.  I thinks been a little over blown as well.  I do plan on adding some gussets later in the project.  I will keep the swing arm in place.  Ultimately it adds more strength since it completes a triangle and now it's going to hold the battery and the rest of the needed electronic will be placed just above the battery.  The seat bars are angled because of where I wanted them mounted to the main downtube.  They are welded to the wide area of the tube, directly above them the tube gets narrower.  I will level the seat out with padding.  I'm not planning on running a spring seat.
I'm not going to write more about the top tube.  It's thick steel, fully welded, creates triangulation.  I'm leaving the rest of the stamped frame in place to hold the spark plug thingies. Most of it's hidden and it's plenty strong.  Once I get the mock up done I'll strip the bike, fully weld the frame, add some gussets and paint it.

Offline tWistedWheelz

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Re: New CB350 Project - Ball Breaker
« Reply #22 on: Jan 27, 2011, 14:11:19 »
Dave I think the real concern here is the fact that the factory stamped steel got its real strength from the welded creased seam, and you have eliminated that. I am not saying your design is bad, or wrong, only that you removed a good bit of strength from the stock setup. Since there is not real "tube" in the neck, remaking that area with sheet metal will never offer you good strength, especially on a rigid. I would suggest welding in a proper tube up there for the neck, then making your triangle with another piece of short tubing from the top of the new neck tube back to the backbone. This will tie it all up real nice and give you ample strength. The real problem with the factory construction of the stamped steel is its lack of strength, and without the crimped welded ridge, it is way too flimsy for your type of build. Like I said, that is just what I would do, and I think everyone who has worked on a similar project here would agree on that. It is something you may want to consider. As for the swinger end, well it does complete the triangle and if you welded in a tube piece on both sides from the bottom of the frame back to the swinger, it would also create the triangle and be more aesthetically pleasing than a swing arm. Just another suggestion though.

Offline tWistedWheelz

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Re: New CB350 Project - Ball Breaker
« Reply #23 on: Jan 27, 2011, 14:18:25 »
This is what I mean on the back end. The red will be the new piece of tube and the green (hard to see) would be a gusset that ties the triangle in tight and allows you to weld some of the cut off swing arm back to it for added strength. I think it would just look better and you could build a battery tray on the back side of the old backbone and mount other electrics to the side of it.

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #24 on: Jan 27, 2011, 14:43:32 »
factory stamped steel got its real strength from the welded creased seam, and you have eliminated that.

I did eliminate the welded seam but I welded in flat strips to hold the 2 pieces together.  You can't see it in any picture tho.

The gusset you drew in the picture is far too large and would look silly.  I think if you guys could see what I really did and all the places I welded and added extra supports in person it wouldn't be an issue.  I do plan on welding in a small gusset where you show it but I think the red bar is overkill unless I remove the swing arm which I doubt I will do.

Offline tWistedWheelz

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Re: New CB350 Project - Ball Breaker
« Reply #25 on: Jan 27, 2011, 14:48:47 »
Your build brother and by no means am I telling you what to do, I am only offering you suggestions. If it puts a smile on your face man, and it is safe, I am just as happy as you when it is done! I am here to offer ideas and receive them. I have learned a lot here and I only try to give back because of all I have gotten. Good on you for doing it your way man. To each his own and that is what a custom motorcycle is all about. If we built them all the same, they would not be custom at all. Keep up the work, I am very interested to see you final product!

Offline Beard

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Re: New CB350 Project - Ball Breaker
« Reply #26 on: Jan 27, 2011, 15:11:53 »
i still vote no brakes period..
and the big shoes..
Jack of everything, Master of nothing.
79 KZ650
http://www.dotheton.com/forum/index.php?topic=14667.0

Offline tWistedWheelz

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  • BUILT NOT BOUGHT!
Re: New CB350 Project - Ball Breaker
« Reply #27 on: Jan 27, 2011, 15:22:39 »
  I'm leaving the rest of the stamped frame in place to hold the spark plug thingies.

I hope that the phrase you used "spark plug thingies" is a joke! And why not run a rear brake, all the stuff for it is still there. As far as the gusset I put on the illustration, well it was just to give you an idea. But if you think it looks silly that is your opinion and you are intitled to it, IMO a swingarm on a rigid not only looks silly but sounds silly too!

Offline dakine_surf

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Re: New CB350 Project - Ball Breaker
« Reply #28 on: Jan 27, 2011, 15:56:00 »
But if you think it looks silly that is your opinion and you are intitled to it, IMO a swingarm on a rigid not only looks silly but sounds silly too!

Bahahahaha +1
Well I tried but I can't run no more
Tell Katie it's her that I adore
And as long as I love her best
I'm that much further west

Offline Dead Bound

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  • 5'6" piece of twisted steel and sex appeal
Re: New CB350 Project - Ball Breaker
« Reply #29 on: Jan 27, 2011, 17:59:17 »
When did this turn into caferacer.net ?
 
Though, I would vote for a regular hardtail if it was in the poll. 
« Last Edit: Jan 27, 2011, 19:58:20 by Dead Bound »
Opeulence, I has it.
78 550K in pieces now.
84 Sporty 883 in the weeds.