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Old 09-22-2013, 06:42 AM   #16
motobene OP
Motoing for 43 years
 
Joined: Mar 2013
Location: Wichita Mountains SW Oklahoma
Oddometer: 832
Quote:
Originally Posted by HolyCannoli View Post
Incredible fabrication skills!
Thanks so much!

Yesterday I finally got a Roundtoit and TIG welded the frame's new left-side brake tab and pivot. There was also a minor dent in a frame near the upper shock mount. I filled it in and filed it back smooth to the tube's profile. Over this spot will go a new black side frame rail sticker, the black grip-looking strip that protects the frame rails from boots.

Today the frame gets painted. It'll look all spiff and new when done. Instead of matte black it will be red. While I appreciate the few leading-edge bits of Raga models, I've never preferred the color schemes which in my opinion are a step down from the Racing and TXT models. I prefer the primary colors to gold bling or black. The latest Replica frame color scheme white, which is better., but I still prefer more color. I sure like that Sherco yellow!

Cosmetics are secondary to function for me, however.

Some data about the frame: the late-model round-tube frames are the same from roughly 2010 to the current 2014 models. It weighs just under 13 pounds. Those side frame rails, BTW, are thinner than one may imagine, so if you do any welding on them it should be low heat or pulsed.

Another interesting bit about the steel frame are the left-right bottom structural members. The foot peg mounts and swing arm pivot portion are one cast piece. The intricate geometry you can observe is made possible without machining by a more pricey casting process called investment casting (or lost-wax casting). Originally developed for jewelry, the parts are made first in wax, then a ceramic coating is formed around the wax part, which gets melted out or 'lost'. Then the hot metal fills the cavity. The ceramic gets busted off the outside and voila! Parts with intricate geometry. modern production methods use injection molds to make the wax parts. If you look on their cored-out backsides of those pieces you will find the ejector pin marks from that manufacturing process.
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