Recent content by Nihilist

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    Gravity -- Does gravity depends on atmosphere?

    A body on a planetary surface will experience a different gravitational acceleration depending on what radius they are from the gravitational source's mass centre (core). This body will also likely be under atmospheric pressure, with a summed force in the same direction as the gravitational...
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    Deflection using strain gages?

    I can tell you it's possible but I'm unable to help you, sorry. Strain is directly related to deflection by Poisson's ratio. As it happens I'm actually interested in any information about strain gauges. What types are available, where can they be purchased, expected cost etc. I work with welded...
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    About home made air conditioner

    I'm not sure what you're asking. 1) The fan will heat because it will be running but it's negligible and it definitely won't overheat because fans are built to spin and it's drawing cool air through it. This is assuming the wiring and power supply are correct. Wire it wrong and you will have a...
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    Greased metal on wet wood rails, making pyramids.

    What is holding the wooden pieces on to the block? I bet taking a side off and rolling it onto the flat is a little scary! If I recall correctly one theory is they used water and fine silt to create a grease.
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    What Is the Most Energy-Efficient Method to Produce High-Pressure Steam?

    Can I ask what this machine is for? I'm not able to help you in any meaningful way with your steam problem but maybe there's a different, less complicated, way to achieve what you want (it sounds like you're just moving a piston).
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    Can Hydraulic Cylinders Be Driven by Refrigerants or Steam?

    What is the rest of the reason for considering hydraulics when you intend on working with gas?
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    Transfer of of force and pressure in a liquid.

    The force does get divided by the whole area of the tank and results in a lower stress than the stress in your applicator. Force doesn't change, area does. Stress = Force / Area
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    I spilled diesel fuel in my car

    There is no diesel on the inside of the tire, getting it inspected is a waste of time. I would be concerned about diesel getting onto the surface of the tread, in wet conditions the grip can be reduced to just as bad as driving on ice. Can be scrubbed off with soapy water easily. Not a huge...
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    Cutting 1/8" Lexan: Saw vs Heat?

    This looks like something that could easily take a nasty chunk out of you if it slips, also it's looks horrible for irregular shapes and not for actually cutting through something. Is 'Lexan' the same material they use for machine guards? Soft, scratches easily but is very tough? Drilling...
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    Could You Recommend Some Famous Essays From Scientists/Engineers?

    Richard Feynman's lectures are very popular, entertaining and freely available. There are packaged torrents with lots of videos, audiobooks, pdf notes/essays in them. Lots and lots of stuff to keep you busy. MIT has lots of excellent material on youtube and on their OCW site. In particular I'd...
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    Misc. Create Steel Art: Smiley Faces to Complex Structures

    The most important thing is a steady hand and good eyesight.
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    Is this the lamest news article ever?

    I thought clocks in the ISS went slower than at ground level. Can someone please correct me if I'm wrong? An increase in straight line distance from a gravitational center will increase the rate at which a clock ticks but orbital velocity will force it to tick slower (compared to Earth...
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    Need laser cutting company, recommendations?

    While on the topic of approaching machine shops, how do they feel about a customer coming to them with a CAM program (made in AlphaCAM) for the part they want?
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    Single load placed on two separate beams

    Maybe not a perfect mathematical model but I would find where the approximate center of mass in the pump is, take this dimension and find the moment from the end of the beam then use this to calculate deflection. Dividing the load by the number of beams.
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    Creating a Fast-Melting Plasma Cutter: A Guide for Science Projects

    Spam bots are getting surreal :rofl:
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