Recent content by billblack

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    Compression of methane

    I do not know what range automotive O2 sensors operate in. You need to keep your O2 content below 2% as far as I know, to stay in a safe range. Our sensors ran in contact with the gas stream itself, sampling 2-5 cfh. fairly simple concept: sensor- meter-alarm. The high oxygen alarm needs to be...
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    Compression of methane

    The BTU content of your methane can vary greatly, from barely hot enough to sustain combustion to blue hot flames. PLEASE, if you compress any flammable gas, include an oxygen sensor on the compressor suction (intake) line to prevent a dangerously explosive mix from being put into your...
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    Mechanical prototyping options

    Yes it does! I went ahead and ordered a fair selection of it, so I shall report how it works. Some manufacturer in Germany or Sweden used to sell a prototyping kit that was packaged in a cabinet. I used one a long time back at an employer far, far, away but for the life of me I cannot remember...
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    Submersible bilge pump

    I thought that might be your intent. An underwater ROV in quadcopter form...ought to be a masters thesis in hydrodynamics. and yes, you will have to feed the motor controllers a signal they can understand, so be sure to get controllers that will take a PWM signal. In addition the controllers...
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    Submersible bilge pump

    Just so we are clear -I believe you mean a PWM signal. I have wired a number of bilge pumps and am not aware of an RC control capable bilge pump or one that is meant to operate at anything less than 100% of capacity. They are merely intended to be made inexpensively and run reliably. The only...
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    Mechanical prototyping options

    I have been looking for quite some time for a source of high quality prototyping parts that I can use to quickly make small to medium sized physical models without having to resort to making one-off parts which eat up time and materials. I think I have found the source here...
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    Invention prototype - help please with bent half tube

    You are correct. You can use exhaust header tubing pre-bent 90 or 180 degrees and then cut carefully with a bandsaw. While you show no dimensions, as long as it is less than 4 or 5 inch diameter, it should be fairly common. Some possible suppliers would be...
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    Recommended software for converting 2D images to 3D CAD model.

    Are you looking for a software program that can automatically convert 2D to 3D, or with the aid of an experienced CAD operator? To extrapolate 3D from 2D for visualization purposes, maybe... To create a 3D file accurate enough to be useful in building parts, there is a lot of information that...
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    What material is best to build a floating bicycle?

    It's a pontoon boat with a bicycle mounted on it. No real reason to change from standard materials used by the boating industry. Aluminum frame, stainless for the metal bits that spend the most time in the water. PVC, HPDE and Delrin for the plastic parts. I am skeptical about the usefulness of...
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    Traversing a square tube.

    if you put the wheels in the corners that would serve to keep the vehicle centered in the tube. That would make things much easier when traversing the inside of the tube. You might look @ as well...Inuktun does this job very well.
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    Motor Selection to Operate Golf Cart Steering Wheel

    Put a torque wrench on the nut that holds the steering wheel on the column and measure the input torque. As far as the motor to turn the wheel, I would think about using a couple of sprockets and a chain to drive it from a stepper with an encoder or a servo motor so you can get some positional...
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    Is 32 really too old to begin higher math?

    I returned to mathematics at age 50 following a rather undistinguished attempt in my teens. I was successful enough to earn a couple of engineering degrees, and these forums were instrumental in my success. I would think that @ 32, it would be a breeze.The more you do it, the easier it becomes...
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    How do I size a hydraulic motor to fit a 12 propeller to move water?

    Hi Steve, Surplus will have better prices than Grainger. The only reservation I have about this plan is the fact that every time you change power from one form into another yoiu lose efficiency. "pushing against a varying total dynamic head from 1 foot up to 18 feet. "...
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    Designing a clay disk launcher

    Do_All White Wing Automatic Trap. Battery operated. Works every time. No engineering required. I have built claybird throwers in the past. If you have a machine shop and a lot of time, it is an interesting enterprise. If you actually want to shoot instead of tinkering with the machine I...
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    Courses Online Math Courses?

    A Google search for "online college math courses" might be a good start. I would suggest that you inquire with your advisor to make sure that the institution that you attend will allow you to take courses elsewhere to get your last 6 hrs and then award you a degree. Some require that your last...