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Distressed Nerd: Alternative to thin spring steel?
Might try researching Urethane. It comes in all kinds of hardness levels from hard to really soft. I even found a website that sells urethane springs. http://www.centuryspring.com/products/urethane.php With a 7 inch OD and 6.9 ID one could probably smash it into a ball and have it return to...- zifos
- Post #8
- Forum: Mechanical engineering general discussion
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Should I avoid head hunters?
Tunalever, I think what Sibeen is saying is that if a firm is making $140/hour and paying a person $100 per hour they will be loosing money rapidly. An income of $40/hour off one person sounds good until you take in to account taxes, benefits, overhead, etc. and realize that it is costing...- zifos
- Post #47
- Forum: How to Improve Myself
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Studies on the use of lock washers?
... "Technology University have shown that the typical helical spring lock washer exhibits a spring rate after flattening which is approximately 70% more effective than a flat washer of the same thickness". ... So how effective is a "helical spring lock washer" that is 70% more effective then...- zifos
- Post #13
- Forum: Mechanical engineering general discussion
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World War II low drag
I wouldn't call the spitfire slow and lumbering. Maybe slow compared to modern fighters (F-18, F-22). I don't think having an engine that last only 1 hour would be usefull. Even if you rebuild it after each flight. You then have 3 guys flying planes and 30 guys rebuilding/replacing engines...- zifos
- Post #12
- Forum: Aeronautic & Space engineering general discussion
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calculating from hp, torque, and rpm how much mass a vibrating motor w
You might start with a motor and vary unbalanced weight and frequency (change RPM using speed controller) until you get a vibration that will wake you up. Its probably easier just to cheat (like Tmoose suggested) but maybe you can make it better... Then you have the "ideal" frequency and...- zifos
- Post #6
- Forum: Mechanical Acoustics/Vibration engineering
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PTC Acquires Mathsoft
MathCAD is the best software since Pro/E!!! I did all my homework in college using MathCAD. It's like a word document that does math and is very easy to input equations, make graphs, solve complexe equations, track units, and etc. All you have to do is type and a document appears complete...- zifos
- Post #14
- Forum: PTC: Creo Parametric (Pro/ENGINEER)
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Friction and contact area
Probably enough technical info so I'm going to not be technical. I remember when I first heard that firction was independant of contact area, I couldn't believe it. I grew up around cars and I know that bigger tires = more traction. Then I came to the realization (or I made it up to help...- zifos
- Post #19
- Forum: Mechanical engineering general discussion
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plastic sleeve interference fit problem
Have you tried adding a little lubricant?? Has made a world of difference for me when trying to press fit parts. Water may even work and won't leave any oily/greasy residue. A soap also works good, I used to use windex to get wake boarding boots on and the water kind of rinses away the windex...- zifos
- Post #13
- Forum: Mechanical engineering general discussion
