Here are the materials all laid out. Tubing from left are seat stays, chain stays, down tube, seat tube, top tube, head tube. Note the markings on the main tubes. Those indicate the butt transitions where the tubes go from thick on the ends to thin in the middle. The rear dropouts and seat stay bridge are shown on the left. The lugs and BB are on the right. 
I begin with rough cutting the chainstays to length. 
The chain stays are then set up in our tube mitering fixture. 
The next tube to be worked is the seat tube. This tube has a double cut. The first cut gives the shape of the inside of the BB shell. 
The next cut makes room for where the down tube and seat tube overlap. This cut is at 90 degrees to the first cut and approximately 60 degrees to the down tube. The rotory table sets the ST/DT angle and the upright peg sets the tube perpendicular to the first cut. 
The next tube is the top tube. The first cut is made at approximately 73 degrees. 
Next, the cut length is set on the fixture. You can see here that the tube needs to be rough cut to length. 
The cut length is set on the leading edge of the block. This is a 58.1 cm top tube. 
This precision turned dowel is set on the fixture and the tube is butted against it. This dowel is parallel to the cutter. This keeps the miters in perfect plane with each other and helps create a straight frame. 
The down tube cut length is set and the peg sets the tube perpendicular to the first cut. 
Next is the third cut. A pivoting dowel is again used that is parallel to the cutter. 
And then the third cut is made. 
Here is the completed main triangle and chain stays. The rest of the braze-ons are also laid out. 
In the next installment, we will mock the frame up in the jig and maybe do some tacking.
Next, the parts are cleaned and placed back in the jig. Flux is then added (the grey stuff). Flux is an acid that becomes reactive at around 900 degrees F. It gobbles up all of the oxides on the surface of the steel and promotes the silver to "wet out" on the surface of the steel. This is a special flux I get from Fred Parr. It resists burning very well and is very easy to rinse off after the joint has cooled.
The joint is heated, the water in the flux boils off and the flux becomes powdery. Hotter yet and the flux liquifies and begins to work its magic. At about 1150F, the silver filler rod is added to the joint. If all goes well, you will be left with a joint that appears to be covered in ice. Good heat control = no burnt flux.
Next come the two cable guides on the seat stays. This is a cross bike with top tube cable routing, so the rear deraileur cable runs along the right seat stay.
Brazed...
The front derailleur cable is run down the backside of the seat tube, around a pulley and back up to the derailleur. This is the boss for the pulley.
Brazed...
Next up are the triple stops on the top tube. A witness line is used to be sure the stops are on the top dead center of the top tube.
Well, you get the idea...
So, if all has gone well in your brazing and you haven't gurnt your flux, a quick dunk in hot water is all that is needed to remove the flux.
Next up, final tube prep and tacking...
引用第8楼蓝魔之泪于2008-06-26 13:55发表的:
开始还以为LZ是个老外呢
引用第14楼mucus于2008-06-26 16:02发表的:
其实国内有能做出这样东西的人,不过如果国内人做成这样的车,有多少人愿意买呢?
如果老外这辆车卖3--5万人民币
国内人做出这样做工的车估计几千元都很难卖.所以国内工匠只能到工厂里做,自己做车养不活自己啊!
引用第15楼刘影于2008-06-26 16:09发表的:
一个2kg以内的钢架如果卖2000元，相信会有稳定的销路。
目前的情况订做一个中高档材料的钢架需要4000元左右，成本还是高，有一定经济实力(或者说舍得花钱)的爱好者才会选择。
引用第17楼Jack于2008-06-26 17:38发表的:
产量是个问题。
引用第9楼lambert于2008-06-26 13:57发表的:
lz是圆圆
山寨架
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