Difference between revisions of "PVD 5.5" Fork Hardtail Aluminum"
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==Welded Up== | ==Welded Up== | ||
==Ageing - Heat Treating== | ==Ageing - Heat Treating== | ||
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| + | So... | ||
| + | |||
| + | I was planning and preping to do a 7005 hardtail as practice before doing some honest FS bikes. I've basically given up finding that the only choices available to a tiny builder are just lame. Basically nobody in the US makes 7005 and it all has to be imported from taiwan. Easton offshored everything a few years ago. | ||
| + | |||
| + | Now I'm changing material to 6061, which gives me zillions of choices of stock, but puts the whole quenching and aging front row center. | ||
| + | |||
| + | I spoke to my local heat treater (http://www.garnerheattreatinc.com/) and picked his brain and shopped pricing. This was the only place I could find with ovens and baths large enough for bicycles. It's going to cost around $400 per run. A run will be anything from 1 to 10 frames. 3 at a time will be a strech for me and will really limit testing and prototyping possibilities. Also, a holding fixture will need to be fabricated for each frame going through the process. | ||
| + | |||
| + | After quencing in the fixture I need to pick up the frames, the frames need to get alligned then returned in the fixture for heat treating/aging. Time consuming to say the least. | ||
===Columbus=== | ===Columbus=== | ||
Revision as of 20:25, 25 January 2008
This is going to be my first aluminum bike, so I have a few details to work out.
Contents
Geometry
Tubeset
Easton Ultra-Lite 7005 Taperwall MTB tubeset
- Down Tube - 429351
- Top Tube - 329375
- Seat Tube - 129338
- Chain Stay - S-Bend, 045715
- Seat Stay - 12° bend??, 529548
7005 Aluminum Stock
This tubing is widely available as special bicycle tubing, but is rare to find as bulk straight gauge tube. ASTM B221 Pertains to 7005(T53)(UNS A97005, #27)Aluminum in Bar Tube and Wire
| ISO | France NF | USA ASTM | German DIN | UK BS | Italy UNI | Switzerland VSM | Sweden IS | Japan JIS |
|---|---|---|---|---|---|---|---|---|
| ALZn4,5Mg1 | 7020 | (7005) | AlZn4,5Mg1 3.4335 | H17 7020 | 7791 | AlZn4,5Mg1 | 4425 |
One source is Fairing, Full 2008 Catalog
- Reynolds 7005, Fairing
- Reynolds
- Columbus Aluminum
- Dedacciai
- Dedacciai - Bringheli
- Asia Metal Solutions
Odd Parts
Ahrens is selling some quality parts, the dropouts look very nice.
Head Tube and Headset
Custom Head tube
- Upper Stack - 8mm
- Lower Stack - 5.6mm
Fabrication Instructions
Easton Fabrication Instructions 7005 & 6061
Welding Practice
Welding Rod
"Use 5356, 5180 or 5183 fillers for welding 7005 frames.", Easton. "5356/5180/5183" Columbus
"Al Mg Si 05 (USA 6063) - CASTO MAG 45802" CeeWay.
Welded Up
Ageing - Heat Treating
So...
I was planning and preping to do a 7005 hardtail as practice before doing some honest FS bikes. I've basically given up finding that the only choices available to a tiny builder are just lame. Basically nobody in the US makes 7005 and it all has to be imported from taiwan. Easton offshored everything a few years ago.
Now I'm changing material to 6061, which gives me zillions of choices of stock, but puts the whole quenching and aging front row center.
I spoke to my local heat treater (http://www.garnerheattreatinc.com/) and picked his brain and shopped pricing. This was the only place I could find with ovens and baths large enough for bicycles. It's going to cost around $400 per run. A run will be anything from 1 to 10 frames. 3 at a time will be a strech for me and will really limit testing and prototyping possibilities. Also, a holding fixture will need to be fabricated for each frame going through the process.
After quencing in the fixture I need to pick up the frames, the frames need to get alligned then returned in the fixture for heat treating/aging. Time consuming to say the least.
Columbus
Frames in 7000 alloy.
The ageing of the frame realized in 7000 alloy has to be carried out 4/5 days after the welding, in two phases: 6 hours at 90°C ±5° - 4 hours at 150°C ±5°.
Easton
Artificial age for 7005 frames:
Age 6 hours at 200 degrees F (± 10 degrees F) plus 4 hours at 320 degrees F (±10 degrees F). This process
must be performed by the builder on all Easton 7005 tube sets.
