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Author Topic: GT380 ground up build  (Read 3996 times)

Offline advCo

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  • Nick Ol' Eye
    • adventur Studios
Re: GT380 ground up build
« Reply #40 on: Jul 05, 2018, 10:26:44 »
got some sketches back from Jeremy, I am really liking the concept, can't wait to finish the mechanical part of the build and start fabricating the pretty stuff. 




I love the sketches. What are you going to do about the exhaust?
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline themotoworks

  • Posts: 97
    • the motoworks
Re: GT380 ground up build
« Reply #41 on: Jul 05, 2018, 10:47:15 »
the expansion chambers I designed will probably be a bit longer, but the exhaust isn't the first thing my eye goes to, so I feel like changing from the pictured design in that area won't alter the overall design much

Online The Jimbonaut

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Re: GT380 ground up build
« Reply #42 on: Jul 05, 2018, 10:51:21 »
Those sketches look great - I love the look of that front fairing, and the lines make the bike look like it's doing the ton standing still.  Very nice!
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline advCo

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  • Nick Ol' Eye
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Re: GT380 ground up build
« Reply #43 on: Jul 05, 2018, 10:59:03 »
Just curious, as the pictured exhaust looks like something off a new FZ07 or something. The chambers on a triple can be one of the coolest aspects of these builds.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline themotoworks

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Re: GT380 ground up build
« Reply #44 on: Jul 06, 2018, 17:48:12 »


finished the head tube and bearing cups, total pain in the butt, had to machine, weld, then finish machine to make sure welding didn't warp the bearing holders (it does way more than you'd think!), but they came out round and .0005" under bearing OD, the bearings went in with a small hammer and aluminum drift, nice and snug but not too tight.  going to set up the engine and a way to clamp my mount plates to the frame jig, then start finishing the frame, probably another day on it

Offline themotoworks

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    • the motoworks
Re: GT380 ground up build
« Reply #45 on: Jul 07, 2018, 19:15:15 »



almost done with the frame, you can see where it attaches to the aluminum subframes at the rear, also a pic of my cutting setup, does real nice work, if I design a frame in SW I can notch all the tubes within a few thousandths, putting the frame together leaves no gaps to fill, a bit time consuming to get all the data from the computer, but definitely worth it

Offline jpmobius

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Re: GT380 ground up build
« Reply #46 on: Jul 07, 2018, 21:27:56 »
Could you elaborate on your thinking regarding the decision to create the aluminum brackets? I realize there is a lot going on in this area, and can see machining the aluminum potentially being simpler than creating a steel fabrication, but don't reckon there to be weight savings.  This wouldn't be my preferred location for a bolted connection, but as you have obviously put a great deal of thought into your choices it would be helpful to hear how you arrived at some of them.  Lovely work all around!  I also am a big proponent of building a virtual model and creating parts directly from it - excellent fitting parts become a function of layout skill!
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline themotoworks

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Re: GT380 ground up build
« Reply #47 on: Jul 07, 2018, 22:32:47 »
it had a lot to do with aligning the engine, swingarm, shock linkage and steel frame with less work than trying to do the same with a weldment, with a weldment I'd be looking at multiple jigs and probably finish machining of the welded assembly to guarantee alignment of the components, this saved all that work and might actually be a bit lighter than the steel spiderweb that would be the result otherwise, the plates are actually pretty light

Offline RR100

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Re: GT380 ground up build
« Reply #48 on: Jul 07, 2018, 23:13:09 »
Bimota frequently used steel trellis with aluminum swinger plates. The MV augusta Brutale's have this construction as well.

Offline themotoworks

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Re: GT380 ground up build
« Reply #49 on: Jul 09, 2018, 19:58:54 »


finished the frame except a couple little spots that can be done off the jig.