I'm a mechanical engineer. I like bicycles a lot, so a lot of my designs are cycling products. I enjoy reverse-engineering commercial products, adding features, & fabricating them via machining/3D printing.
I believe in liberating certain products because they're common & well-suited for 3D printing. I hate spending money & like CADing, so it's reasonable to make these things. I upload all the things I've made that will almost certainly not make me money, or commercial inspirations are widely available.
All my designs include the relevant design files should you want to modify/customize them. Please give me credit if you do this. If I forget to include these files, please let me know. I also may add other features/modify the designs at any time. Contact me if you have any ideas. I'll do it if there's a decent amount of interest, or it's a very good idea. For commercial spinoffs, I only do them if I have the actual part (if it's a fairly complex geometry, etc.). Only if the geometry is relatively simple do I base the model off of good pictures found online.
I can use Solidworks, Inventor, & Creo, though the former is my favorite.
I have used:
- MakerBot Replicator
- Lulzbot Mini
- some other MakerBot
- HIPS, PLA, ABS
A lot of my designs involve metric bicycle hardware, which are fairly small. Since the vast majority of my designs are meant to be 3D printed, I resize everything to account for strength loss & shrinkage. My best rule of thumb for holes and nut insets around 5 mm in diameter is to apply a 115% scaling factor. I arrived at this just through trial-&-error, but it seems to work very well. If you are rendering these designs in metal, I suggest you redesign from the ground up, since you'll be leaving a lot of redundant material, & it'll weigh unnecessarily more.
Common bike industry threads: http://www.parktool.com/blog/repair-help/basic-thread-concepts#article-section-6
Zipties: I ususally specify this, but I like using 0.20" wide zip ties.
Cable stops & housing
- shift ferrules: 12.77 mm long, 5.78 mm OD, 1.80 mm cable hole, 4.28 mm ID
- Shimano shift barrel adjuster: 7.99 mm ferrule seat depth, 5.94 mm ID, 12.40 mm threaded length, 4.86 mm total outside thread diameter, 2.24 mm cable hole, 12 mm length
- brake barrel adjuster: 7.98 mm ferrule seat depth, 6.41 mm ID, 8.69 OD (variable), 10.31 mm barrel length, 14.45 mm threaded length (with locknut on), 2.45 mm cable hole
- 4.17 mm shift cable housing OD
- 4.95 mm brake cable housing OD
1985 road bike tubing
- 28.85 mm downtube
- 25.56 mm top tube
- 29.01 mm seat tube
- 27.81 mm generic tube (average of three above)
General safety disclaimer: use my designs at your own risk.
Other warnings: some of my designs date back several months. I try to be accurate in my descriptions, especially when it comes to features, hardware, & installation, but I'm too lazy to go back & verify some of these things, or I just remember incorrectly. So be aware of that. If you find an error, let me know.
Unless I explicitly said I tested a design, assume that I didn't. In that case, don't expect things to work if I didn't test them first.
I Am A…Engineer
Tools I Use…
Design Programs: Solidworks, Inventor
3D Design Skill Level