Chris Johns
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  • Last seen more than a month ago
Are there pumps that can vary their pressure and flow rate, while maintaining the same power?
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It is possible to use a venturi nozzle to create a low pressure/high volume airflow from a high pressure/low volume one. In essence these are very similar to the way that a venturi gas burner works ...

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Is ductile iron a good material for a support column cap?
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A properly specified weld will as reliable as any other type of joint and castings are subject the their own set of potential defects. In terms of performance (in the absence of a specific context) ...

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Why is the jacket or sheath of fibre optic endoscopes always black?
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Industrial polymers are often black by default because carbon black pigment is added to stabilise them against environmental degradation, especially the effects of UV light. This is certainly the ...

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Designing the pivot point for a swingarm
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Rubber or plastic bushes are the conventional solution for suspension mountings. They cope well with shock loading and vibration, help to isolate vibration from the wheels and are reasonable tolerant ...

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What is the longevity of Delrin rollers on aluminum linear rail?
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Given that you're using extruded aluminium rails polymer rollers are likely to be the best solution as anything harder will likely make the wear rate of the aluminium more of an issue. To be honest ...

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How do the springs really work in my design?
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In measuring response to impact you really want to be using a system where the kinetic energy of the impactor is well known and very repeatable. It's also important to realise that in most cases ...

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Pneumatic cylinder force output and impact energy
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In general pneumatics are quite precise when it comes to force but modeling energy in this context brings in a lot of additional unknowns which make be difficult to measure. The most common method ...

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Compound gear system ratio
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I think that the most useful answer to your question is that, in practice we are most concerned about the relative torque between two linked shafts. To put it another way the forces on gears are ...

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How much force can a pole in ground take before falling?
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The first scenario is that the pole is very firmly anchored into the ground in a hard and reliant surface to a good depth for example if it is embedded in a large mass of concrete. Here the pole will ...

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How to define Knurl on drawing?
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Knurls are usually made by rolling or cutting. A tool with a free-spinning rotating head (or opposed pair of heads) is pressed into the part on a lathe and the pattern is transferred (in negative) ...

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