Recent content by Lnewqban

The heating could be induced by the thread profiles of screws and nuts not perfectly matching, as when new. If that is the case, extreme-pressure (EP) grease containing molybdenum disulfide may help. Some load-induced misalignment could also be forcing the nuts not to work perfectly in line...

Could you post one or more pictures of the mechanical part of the lift? Perhaps we can spot a source of high frictional loss.

Could you post a picture of the whole assembly, including the structure that supports the bearings, please?

Heat transfer = Flow of energy through a material (as conduction). Temperature difference (or delta T) = It induces thermal energy flow from a hot source to a cold sink. Transfer area = Area perpendicular to the flow of thermal energy. Heat transfer coefficient = Rate at which energy flows or...

Just another approach:

Just another graphical approach:

The resolution of the attached photo is too low to make it readable. Note that links AB-BH-HA form a solid triangle piece. Do you have a reason to assume that link BH is parallel to the common axis of the sliders?

You are on the right path. I would use the concepts of moment (F x perpendicular distance) and work conservation (F x distance = constant for all nodes). Consider the exact direction in which each node is free to move at the instant shown in the diagram (those constantly change with time as the...

Have you been given any dimensions for the links and geometry?

Please, see: https://en.wikipedia.org/wiki/Coandă_effect Note that the edge of the circular plate should not affect the flow much, since both are parallel to each other. Once the flow goes over the edge, the surface friction disappear but interaction with air in relative repose begins.

Please, see: https://www.sciencedirect.com/topics/engineering/boundary-layer-separation The size of the straight and plain wall respect to the induced airstream should be an important factor. The radial velocity of the air over the surface (in a direction perpendicular to the airstream) should...

At the tip of each blade, there is also a reversed flow or vortex moving air and dust from downstream to upstream due to pressure differential.

The blades of any type of fan transfer kinetic energy into the mass of gas that is surrounding them. That energy is observable as difference of velocity and static pressure between upstream and downstream of each blade. Please, see: https://en.wikipedia.org/wiki/Fan_(machine)...

By accelerating its small mass (m) along the bar, the muscular force of the bug will need to induce a vertical component equal to (M+m)g. That would be easier achieved at positions of the bar closer to vertical.

Wherever persons can be in contact with electricity with voltage above 60 volts, the salty fluids inside their bodies can become a conducting path to electrons, which could interfere with the electrical control impulses reaching their muscles, especially the very important one named heart...