All the points you raise have answers in mechanical engineering and bicycle mechanics.
To pick one: the compression of a closed quick release does change the adjustment of hub bearings, easily demonstrated. Various techniques exist to correct the hub bearings adjustment for this. Barnett publishes a technique, a bit fussy, but it works. The technique he demonstrated to me was flawed. I show him the flaw in logic and he dismissed it. He put pressure on the end of an axle on one side of a hub and pressure on the lock nut on the other side of the hub. There is never any pressure on the end of a skewered axle. The clamping force is only on the lock nuts against the dropout surfaces. His test had two variables instead of one. Does the axle compress under quick release loads or do the threads flex. One test will not answer two variables. Two test are needed to test two variables. Yet only one test is valid. Since a QR can never press against the end of an axle and still have clamping force on a lock nut against the dropout, pressing against the end of the axle test is invalid. John' s testing wanted to find a specific amount that a hub could be adjusted from the standard bench adjustment to the on the bike correction for quick release forces. He came to realize that the variables in axle materials and quick release materials and construction were to great for a unified answer. I solved for his issues and his beliefs dismissed my solution. I demonstrated a perfect adjustment for the added load of a quick release in less than 30 seconds. Once I did six adjustment in 10 seconds. My special tools cost $6 from a frame builder. Special tools do exist, but unnecessary. Most mechanics learn in school or from someone like me, People are asking me for free instruction, is your knowledge free? if not why are you advertising here also? and most develop their preferred method.
Chains don't stretch. At 2000 pound of force chains do stretch, True: on a bike they only wear. Cables do. At 550 pounds of force derailleur cables stretch, but the plastic shift lever mount will fail at 200 pounds of force, at 800 pounds of force brake cables stretch. sadly a rim side wall brake surface will start to fail at 160 pounds of force. Numbers don't lie and are verifiable. (Very different structures.)
Spokes remain elastic. Spoke elbows deform from the original 90 degrees to the best pull angle, effectively making spokes longer once. On aluminum hubs the elbow indents the hub flange hole making the spoke effectively longer once. Neither of these changes the elastic properties of the spoke, but they do make the spoke effectively longer once and drop the tension of the wheel, allowing for greater tension ranges in spokes, creating early fatigue and spoke failure. Also reducing the efficiency of the wheel to accelerate as looser spokes need to be tensioned by the force from the chain before they move the cyclist forward, and the wheel has more side to side movement with looser spokes making control and braking less than optimal.
May I suggest that these complete thoughts are not currently put together cohesively by engineering books which I have intensely studied, or bicycle best practices knowledge bases. or by you.
May I suggest familiarizing yourself with current best practice (rather than the noise that gets written on the web).
I suggest Sharp for the basic mechanical engineering My experiments with the wheel in both practice and with finite element analysis and computational fluid dynamic program ANAYS. have shown insight intto the wheel and how to do wheel work 20 faster for better result. and Barnett for current mechanic best practice. As a BBI certified master tech, I can point out many flaws to Barnett's best practices. From making mechanics less profitable with slow procedures that are not valid in their testing. To just plain bad science understanding.
Get back to me if you have questions after having thoroughly understood those. I am back, Now are you ready to learn? or do you have any ideas of your own that are brilliant. I am all ears
On Sun, Oct 16, 2016, 1:24 PM christopher@holisticcycles.com wrote: Hi David, What are you trying to build? I am not trying to builds I am trying to understand what has been built to improve efficiency of mechanics by up to 40 times current speed. Helping mechanics earn a living wage. Not a lot of CFD in the bike world. Do you know this as fact or a belief that you hold strongly? And after over a hundred years of engineering, not a lot of need for FEA. In the 1880's to 1890's there was amazing engineering, some material sciences in the 1980's improved friction, ending of the cold war brought advanced materials in the 80's and 90's Sadly as a student of the root causes of problems I have found the engineering in most bicycle systems is lost and strong held beliefs are the replacement.
A couple of examples: A chain has a pull strength of 2000 pounds before it stretches, If you wish to stretch a chain put a car on your back and stand on one pedal. What is the root of chain lengthening, What is the relationship between side to side flex of a chain and shifting quality? Do all new chains that measure the same length have the same side flex? Is there a relationship between chain length and flex. A spoke is made of a magical metal that stretches once and then becomes a harder metal and never stretches again. A spoke can be tightened until it will pull the nipple through the rim because the rim is not as strong as pull force that can be applied by the spoke. So how do rims stretch spokes to become looser in tension during the first 30 days of riding? Derailleur cables are anchored by a threaded fastener on one end and on the other end sits in a plastic seat in the shift lever. The derailleur cable has a pull strength of 500 pounds of pull before it will stretch, the plastic seat will fail before the cable will. How do cables stretch one time then never stretch again when pulled by a weaker plastic component?
Does a quick release lever change the adjustment of a hub? How do you isolate and test your theory? How do you adjust the hub precisely for a combination of a specific axle (mild steel, hardened steel, Titanium, Aluminum, ) and a specific Quick Release material (Steel, Aluminum, Titanium, with or with out plastic components )? How do you precisely adjust a hub for QR forces in less than 20 seconds? If engineering has been done, then it should be easy to answer all these question by looking in books, or on line, or from schools.
Which acts like a fluid on the bicycle? hydraulic brake fluid? a wheel rim? or a chain? A little hint, Brake fluid when contain in a system acts as a solid to transfer forces. Brake fluid outside of a system acts like a fluid.
If you would like to communicate on how CFD with FEA can change the world of cycling I would love to talk, If you believe engineers created cables that stretch once, spokes that stretch once, chains that stretch with human load of less than 2000 pounds, well I will not change your strong belief system.
Christopher Wallace 773 490 0683
Good morning,
Sorry, no. I once did some programming for FEA and CNC but ages ago, and my IT friends wrangle server farms, databases, and state IT departments.
Take a look at Monster.
Also post a query on one of the CMU boards or Pitt Craigslist.
What are you trying to build? Not a lot of CFD in the bike world. And after over a hundred years of engineering, not a lot of need for FEA.
David
On Sun, Oct 16, 2016, 11:14 AM christopher@holisticcycles.com wrote: Do you know anyone that is fluent in Ansys? CFD FEA? or know where I could look for a person in the field?
Christopher Wallace Holistic Cycles 773 490 0683 Oak Park, IL. 60304
-------- Original Message -------- Subject: Re: [TheThinkTank] CiviCRM From: David Zundel davidzundel@gmail.com Date: Sat, October 15, 2016 6:38 pm To: Jonathan Morrison jonathan@bicyclecollective.org, The Think Tank thethinktank@lists.bikecollectives.org
CiviCRM goes on a server (vps recommended and affordable) then accessed by a web page, fairly easy. Or you buy Civi hosting, but that defeats some of the purpose of using Civi. Civi has considerable power and ability, can connect with ERP, etc but not for IT novice. Easy to install, configure, and maintain if you have experience and comfort with Linux servers, if not, not.
You can certainly hire the Linux talent in SLC, but dependence on outside IT service has inconveniences.
Email me directly if you want to get into details on Civi.
David http://openwest.us
On Sat, Oct 15, 2016, 8:20 PM Jonathan Morrison jonathan@bicyclecollective.org wrote: What staff resources does it require?
On Sat, Oct 15, 2016, 7:19 PM jack jack@bikewalkwichita.org wrote: We use Salesforce / Wordpress / Mailchimp and have been pleased with what all we can do, for free.
-------- Original message -------- From: David Zundel Date:10/15/2016 7:33 PM (GMT-06:00) To: The Think Tank Subject: Re: [TheThinkTank] CiviCRM
CiviCRM recommended
David
On Sat, Oct 15, 2016, 6:13 PM Jonathan Morrison jonathan@bicyclecollective.org wrote: Has anyone been using (https://civicrm.org/) or would they recommend a different software package?
-Jonathan
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