martin manning wrote: ↑Mon Sep 21, 2020 9:40 pm
Ah yes, good point about the front end geometry. I made a study of bike geometry and an Excel tool (see: http://www.os2.dhs.org/~john/Bicycle_Geometry/), and also of handling characteristics. Fascinating stuff! Junking up your thread here, but...
No Way! I downloaded that many years ago! I just looked at an old backup on my server and the date is from 2008! Nice work on that project, you must have put a ton of hours into that. Have you been able to play around with BikeCAD by Brent Curry? That's what I've been using to generate models and just as an output tool for my cut list. He's constantly tweaking it and making it better but it's an incredible tool for easily making small changes to study geometry.
My apologies for telling you what you already know. Most peoples eyes glaze over if I start talking about bike handling geometry.
I don't mind the thread being junked up. I got confirmations of a few of the parts and learned about a few more. The only two mysteries left are the glass diodes and the B60S disc.
No worries. I had a look at BikeCAD back when, but I was already deep into building BG101. Handling is really fascinating. I have a great book that a guy at Cal State SLO self-published (he used to teach a class where the students designed and built their own unconventional bikes), and there are some really good papers out of Delft (NL) and Cornell.
Glass diodes are usually marked, usually in very tiny print and sometimes with an abbreviated part number. The little component tester I linked above might actually be able to get something in-circuit, but I have not tried that.
B60S might be a bridge rectifier, I see four traces leading to it, and it is near some large electrolytics. If you trace the circuit out you can probably confirm that.
B60S is a bridge rectifier. I have three different Rectron ones on hand that look just like that except the numbers are different. If the height is nearly the same as the diameter, it's probably 2A. If the height is half the diameter, it's probably 1.5A. It is unlikely to be rated at any more than 2A with that particular package.
Radio Shack used to sell a bridge rectifier that looked like that.
martin manning wrote: ↑Mon Sep 21, 2020 10:38 pm
No worries. I had a look at BikeCAD back when, but I was already deep into building BG101. Handling is really fascinating. I have a great book that a guy at Cal State SLO self-published (he used to teach a class where the students designed and built their own unconventional bikes), and there are some really good papers out of Delft (NL) and Cornell.
Fascinating indeed. Most of the reading I've done over the years pertains to road bikes where the load is mostly static. The theoretical/practical elements are interesting too and something I find myself saying often to customers is to remind them of how adaptable they are, it's one of the best parts of being human! Over the past five or so years I've become increasingly interested in geometry and weight distribution as it pertains to mountain biking where the loads are wildly more variable and traction can't be taken for granted and viewed as a constant as it usually can on a road bike. In the last 20 years as my own cycling pursuits have shifted from competing in observed trials (the slowest form of mountain biking) at a high level, to racing DH oriented events I've been building test mules to form opinions on degrees of specificity that I believe informs how I interpret what my clients are after. All of the theory, the rake/trail/HTA numbers are good to know, but the proof is when you can get out to A/B a couple of bikes over a section of trail and literally feel how a slight change in trail affects front wheel grip in all different kinds of corners. It's all good fun, keeps my brain busy and my friends happy since they get to ride nice bikes for free. We don't have much space here, so I've got about five bikes that live with friends around town that we're all constantly trading and refitting parts for testing. It's nice to have a machine shop when I want to go knock around to try a new thing. Now that I'm dorking around with others suspension designs the wormhole gets bigger and deeper.
Ten Over wrote: ↑Mon Sep 21, 2020 11:06 pm
B60S is a bridge rectifier. I have three different Rectron ones on hand that look just like that except the numbers are different. If the height is nearly the same as the diameter, it's probably 2A. If the height is half the diameter, it's probably 1.5A. It is unlikely to be rated at any more than 2A with that particular package.
Radio Shack used to sell a bridge rectifier that looked like that.
