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For those that currently performance stack-up analyses or are interested in doing so, would you be willing to buy a spreadsheet calculator on-line or do you only rely on self-made tools. If willing to buy on-line what functionality would you look for in a stack-up tool (e.g. worst case, RSS...

I don’t know how to get rid of any more backlash in my design without going to a more complicated design (although I am very much inexperienced with gears). I have done what I could from a dimensional and tolerance stand-point to manage backlash while still making it producible. To implement...

We had considered plastic gears early in the design, but aluminum chosen as a more robust solution. Based on the test data there may be argument for reevaluating that decision. Are there any concerns or limitations with a plastic gear driving a steel pinion?

Vibration comes from the environment; the assembly is installed in a fixed wing cargo/transport aircraft. Although the testing that destroyed my gear was part of accelerated life testing, and with that said the levels were much higher than those actually expected in the aircraft. The gear is...

I have an application with a gear on a human interface device that currently uses a Type II anodized finish. However, after some testing under heavy vibration there was excessive wear on the gear face (finish was completely removed). I am working on several solutions (including addressing...

KENAT I think this is the post you are referring to: http://www.eng-tips.com/viewthread.cfm?qid=206463&page=1 I found it today when searching for ‘GD&T’. Although the post is referring to tolerances it answers my question indirectly. Since we have a similar tolerance conversion note our...

Hello, The mechanical drawings that my company generates are in standard units (inches) and typically to the one-thousandths place (i.e. .001). However, we have some drawings that require (for European customers) that dimensions be called out in both inches and millimeter. Standard practice...

In ANSYS the modal analysis is treated as a linear analysis only. You can still have a non-linearity in your model (i.e. compression only contacts). But when you run the modal analysis the non- linearity will be ignored. (i.e. compression only contacts will be treated as bonded).

I release this is a fairly old thread. But just encase you or someone else is looking for encoders, I would suggest the Grayhill 62S line of optical encoders: http://lgrws01.grayhill.com/web/TABproducts.asp?SolutionCatID=312&LevelID=3&TabID=1 I am not sure if they mention it in the datasheet...

Hello, Looking for clarification on how fans work, theory vs real life. I am told that if one measures the volumetric flow rate through a system it will be the same at all other conditions. So for a given electronic box and fan that flows 50 CFM of air at STP it will also flow 50 CFM at...

kenvlach, Thank you for the informative reply, I think it makes sense now. It is interesting that you brought up the link to "Diffusion Bonding," by Amir Shirzadi of Cambridge Univ. This is one of the sources I was confused by because it refers to this process as “Diffusion Bonding”, and...

Hello, I am looking for clarification between Transient Liquid Phase (TLP) Diffusion Welding (DFW) and Brazing. The sources I have found so far have a lot of contradictions about the definition and terminologies involved in these processes. Some call TLP Diffusion Welding a form of Brazing...

I was wondering if anyone could help me to understand the behavior of the automotive pneumatic tire. In particular I am interested about the load sensitivity. I have read various sources on the subject but have yet to find a satisfactory answer. I understand that the two primary means by...

GregLocock, I took your advise and ran a little experiment this evening on my Ford E-150 conversion van. I measured the driver side front at 33PSI on the ground. Then I jacked up the tire, and measured 32PSI. Lastly I lowered the tire back to the ground, and measured 32PSI. I really...

Hello, After reading about tires in Race Car Vehicle Dynamics by Milliken I have a few questions. According to the book the coefficient of friction of the tire decreases with an increase of load. I am wondering what happens to the footprint and pressure when a tire undergoes an increase in...