5

Mill hardening would refer to work hardening, where cold-rolling the material distorts the grain structure and causes dislocation pile-up and entanglements, which reduce the material's ductility and thereby increase its yield strength.


4

Normally fans are not custom built by a company that does not build fans. The concept of a centrifugal fan is not particularly complicated, but it is difficult to achieve target flow rate, pressure, and efficiency if your company does not do it on a daily basis. If you are not able to purchase a fan, another option is to copy someone else's simple straight ...


3

In order for the Resultant force to be vertical you only need the sum of the horizontal components of $F_1$ and $F_2$ to be zero $$F_{1x} - F_{2x} =0 $$ $$F_{1}\cos(70) - F_{2}\cos\theta =0 $$ $$\cos\theta=\frac{F_{1}}{F_{2}}\cos(70) - F_{2} $$ $$\theta=\arccos\left(\frac{F_{1}}{F_{2}}\cos(70) - F_{2}\right) $$ if you substitute you should get $$\theta=50[...


2

I'm not an expert, but the disk in a disk brake system needs to absorb enourmous amounts of heat to dissipate the energy of motion. It then needs to transfer that heat to the air. Polymers generally are poor heat conductors and have relatively low heat capacity. Add to this lower strength and you have a poor choice for disk material. As Jim Clark mentions in ...


2

Mill hardening is a catch-all term for any set of processes that produce a standard alloy with defined properties from the metal mill. It is used when talking about treatments by a material vendor that a workpiece will have been received with. In the shop you may apply further treatments to different sections, but the "mill hardening" would refer ...


2

Well mass and high-temperature behavior are really the key benefits with carbon/ceramic brakes. High temperature: Their high temperature properties make them more dependable during heavy use as they barely suffer from brake fade, they are also not prone to warping due to carbon fibers extremely low coefficient of thermal expansion (CTE). The CTE is actually ...


2

I don't have time to type this up nicely - thought it would be quicker to write out by hand but in hindsight my handwriting is terrible. Let me know if you can't read anything!


1

Storing liquid rocket propellants has been been a tedious business that has kept thousands of engineers employed since the '60s. The variables of primary interest are time and mixing/settling/agitation. Over time, stuff decomposes, especially if there are a few molecules of catalytic impurites in the container vessel. Then the decomposed species stratify ...


1

On the motor spec sheet you are correct to used the "Gear ratio 1/300" graph because that is the motor+gearbox that you intend to purchase. Those other graphs are for different models that the company offers for sale. I did not have time to dive into all your previous questions. So I will just explain what this motor can do and you can decide if it ...


1

According to ISO 4156-1:2005, the following definitions apply: 3.6 fillet root spline spline having a tooth or space profile in which the opposing flanks are connected to the root circle (Dei or Die) by a single fillet. 3.7 flat root spline spline having a tooth or space profile in which each the opposing flanks are connected to the root circle (Dei or Die) ...


1

The short answer is - always verify power AND torque for any system. Then you never have any surprises. Pete's guess on speed (1000 rpm) is in the ballpark. Most hydraulic gear pumps/motors have a minimum operating speed around 300-500 rpm. I'll use 800 rpm as a conservative example. At that speed your flow rate would be Q = (0.25 in^3/rev) * (800 rev/min) / ...


1

The AC power plugs vary a lot country to country. You will need to know how you plan to attach the pins to your circuit; ex wire solder cup, wire crimp, pcb surface mount solder, or pcb through hole solder. The exact manufacturing methods vary greatly based on those choices. Unless you have unique requirements, I would definitely recommend sourcing pins ...


1

The circular tooth width (thickness) is the arc length of a tooth, generally measured at the pitch diameter. Think of the gear profile as a simple circle with diameter equal to the pitch diameter. If your gear has 30 teeth the thickness will be the circle's circumference (pi * pitch diameter) divided by the number of teeth [30] to get the arc length of a ...


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