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3 votes

Is there a positive displacement pump that experiences only rolling resistance?

Rolling diphragms have been around for many years now. See... https://www.diacom.com/rolling-diaphragm-theory With or without the spring. (With enough vacuum in the top you can get the membrane to ...
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2 votes

MANUFACTURING PROCESS: ROLLING PROCESS

Because the cross section of strip decreases during the milling process, its speed will increase to match the roller's speed at the point when it leaves the rollers. Otherwise the rollers my warp or ...
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1 vote

Is there a positive displacement pump that experiences only rolling resistance?

Progressing cavity pumps. The rotor executes a rolling motion in the stator, because of the different auger like shapes of rotor and stator the cavity between moves along the axis. This video shows ...
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1 vote

Is there a positive displacement pump that experiences only rolling resistance?

Our body has several examples, our throat when swallowing, our intestines would be another example. Arteries in our legs pump the blood by our leg muscles squeezing them.
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1 vote

Effects of rolling resistance on wheel angular and vehicle longitudinal speed

WIP waiting for clarifications A way to look at this is the following: The rotational speed of a wheel will increase if the torque $T_{tij}$ supplied is greater that the total force from the ground. ...
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1 vote

What's the purpose of trimming loops at ends of every coil?

Trimming can be related to the manufacturing process. If the process causes material at start and end to be of different quality, then removing them in order to only use the consistent product makes ...
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1 vote
Accepted

What's the purpose of spraying water on rebar coils but not on plain coils?

The rebar may be getting some hardening depending on temperature and chemical composition. If they are hot enough to show any color ( roughly 1200 F) it is definitely some hardening. Because the ...
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1 vote

Why steel coils are called Wire rod?

Standard industry terminology . Ingots, blooms , billets , wire bar ,wire rod ( to 4' diameter) , sheets ( flat stock up to 1.5 " thick as I remember) . Probably better for you to learn the ...
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1 vote

Can a rolling wheel create a side force without first rotating on a vertical axis at its contact patch?

Your understanding is missing substantial information regarding statics and equilibrium. Think for a minute: The instantaneous forces acting in the wheel system are radial velocity, momentum, inertia,...
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