24

The vending machines have different product delivery box implementations. One of the most common ones -I've encountered- is the following: Basically you have a box which has an opening, as shown in the picture. The opening is big enough for the products to fall in. When the box pivots, then the closed section of the curved face "closes" the access ...


11

I think the locking mechanism is more or less like this: Note, the actual setup could be different but the concept of locking through a barrier that prevents the slide plate been pushed up remains the same.


6

It approximately means it is allowed or forbidden to have scratches at the place of round. When you are making cylinder surface you can to do it many different ways: milling, welding, soldering. In one case must be strong requriment for smoothness of surface (for example in bearings need to minimize friction). In other cases it is allowed to have scratches (...


6

The image shows what is often known as a zerk fitting, aka a grease fitting. The ball seals the passage from the outside to the internals which require grease. A grease gun with a properly sized connector will snap onto the zerk fitting. The gun is used to pump grease under pressure to the area described in the image as "no space, grinds," likely ...


5

Split system air conditions (heat pumps) are refrigerator based systems. The two tubes you mention transport refrigerant from the compressor in the outdoor to unit to the indoor unit & return it from the indoor unit to the compressor in the outdoor unit, in a closed loop. Water is removed from the atmosphere by condensation, by the indoor unit. This ...


5

I think it might be shorthand for a kinematically constrained design. It is the "This height gauge has three points of contact with the surface plate which makes it kinematic." which makes me suggest this interpretation. I also found a link where they seems to equate a "kinetic mount" to a mount that is "is fully constrained, but not ...


4

Imagine you were driving a car along the path shown in a cross section view of the radius - you need to make a 90 degree bend, and you need to stay inside the cones that denote the tolerance band. In the first image, you find yourself about to hit the cones, so steer sharply left, then almost hit the other cones, so steer right, left, right etc. In the ...


4

Yes, it would be easier to drill the hole but there are other reasons. It's makes the shaft the same width as the red bearing also clamped by the green sides. The shaft will experience torque when the knob at the top is tightened. A hole though a round shaft would have high pressure on the curved edge at a point on each side some little distance away from ...


3

Regarding the first question: why 1 ship is more efficient that 100 smaller ones. if you did some research I'm sure you'd find that one large ship probably uses about the same steel than a 10 smaller ones capable of carrying the same load. See evolution of container ships. A ship 200x20x10 meters could transport about one tenth of a ULCS (which is 400x59x16)....


3

If I hadn't messed up understanding your idea then you can connect all rods to achieve the desired result. I've considered two bars connecting to maintain all rods paralel to each other. The starting position will be with Rod A and Rod B are inactive (position 0-0) and rod Y will remain in $Y_0$. The intermediary position Rod A or Rod B will be active, and ...


3

The impulse causes lateral acceleration of the rod and rotation of the rod. $$ P=m\frac{dv}{dt} \quad \text{for lateral acceleration}$$ $$ P=I\frac{d\omega}{dt} \quad \text{for rotational acceleration}$$ We calculate the net acceleration for each point along the length of the rod and after multiplying that by the density of the rod we get the forces' acting ...


3

I don't want to spoil the fun of solving this for yourself so I offer the following suggestions: Redraw the assembly with all edges, including the hidden edges, shown as dotted lines. Draw solid lines on all the intersections. Join up any vertices which form edges not on the outer surfaces of the assembly. Count the faces. Step 3 is the only tricky bit. In ...


3

A simple machine is what you're referring to. A simple machine turns motion into mechanical advantage. Examples include: lever inclined plane pulleys wheel & axle gears inclined plane/wedge/screw These machines convert extra motion or rotation into mechanical advantage so that the same work can be done with less applied force. As for this: How can ...


2

Take a look at a silicone gun mechanism. Simple and practical and does exactly what you are trying to invent.


2

In ASME Y14.5:2018 5.16.2, the term reversal is used in the definition of CR: The part surface shall be a fair curve without reversals. The term is not defined. It probably means that the curvature sign (measured in 'some' plane) doesn't change as figure shows. For your information, in ISO GPS ('Geometrical Product Specification') tolerancing, the ...


2

The chart shows the maximum power with the throttle wide open. You can run at lower powers simply by having the throttle partly closed. If you want to use a low power output like 0.24HP, you will probably need some sort of automatic control system to keep the RPM down to 2000. A simple throttle lever with manual adjustment might be too sensitive to adjust ...


2

You have the right idea using a shoulder screw. In between the two pieces, use flat washers and a springy Belleville washer. A Belleville washer, also known as a coned-disc spring, conical spring washer, disc spring, Belleville spring or cupped spring washer, is a conical shell which can be loaded along its axis either statically or dynamically. A ...


2

The topics necessary warrant their own books and each topic is sufficiently large that the books already exist and are large already, so combining them into one book would mean you could not carry it. The logical solution is to have books for each topic,: mechanics, thermofluids, tribolgy, control etc and you combine what you need according to the problem ...


2

I'd personally go with Magnetic actuators, as those are highly reliable and can flip between their states extremely fast. As they are providing linear motion in a rather short range, you would need some lever on the hinge, but the part itself can be the hinge. Most magnetic actuators also have a rather small build volume, so the actuator might even be ...


2

If you consider the base concept of material used versus available volume for transport, a smaller vessel will have a poorer result. A water craft capable of carrying one container will use a certain amount of material, call it c and assign the value of one. This imaginary assignment is containers divided by material, equal to one in this example. The next ...


2

Instead of a Servo, this could be very easily be done by the combination of a spring and a linear magnetic actuator. The downside is, that the setup needs a minimum weight of the item to overcome the closing spring. Upon detection of the hand, the actuator retracts the locking bar and the weight of the item pushes the door open against the spring. As the ...


2

If you look at some common vending machines (I'm talking about the ones that hold snacks), They dont use a servo. Instead they have a motor turn a screw/coil continuously until the purchased item pushed along drops from inside the coil, tripping a simple sensor (like a limit switch) which tells the motor to stop. Feedback ensures the purchased item is ...


2

No. You cannot increase both torque and speed without adding more energy to a system. In a gear train/belt & pulley combo, you have one member rotating slower but with higher torque and the other faster but with lower torque. You would need an outside power source to further increase the speed or torque beyond what you input, per the conservation of ...


2

The easiest way to do this (either the direct or the inverse) is with the use of the homogeneous transformations. Basically, it is an augmented transformation matrix in 3 dimensions which can also accommodate translation (and scaling - this won;t be of much use to you). The main form is: $$T = \begin{bmatrix} \color{blue}{ R_{11}} & \color{blue}{R_{12}} ...


2

That is just clearance between the Cotter and the Socket/Spigot. The Cotter pushes only one one side of the slot that it is fitted into, so there should be clearance on the opposite side to ensure this. "D" = the last two digits of the roll number, as shown at the bottom right. The image below is taken from https://www.youtube.com/watch?v=7sUjb-...


2

Theoretically, a well lubricated, aligned, and maintaned gear box should have theoretically zero static friction. If you are after estimating what the torque is to get it to move, to my experience, it is always easier and best to test the torque required to start it moving. The reason is that apart from the individual elements, how you implement and setup ...


2

You could take an over or between pins measurements if it's the male or female part. Take 2 measurements using 2 different diameter pair of pins. Assuming the edges are fairly straight you should be able to deduce the dovetail angle.


2

To expand on comments: This drawing is a little bit sloppy. As it's a clearance hole, it should just indicate thru diameter and both diameter and depth of cbore. Takes almost no effort in any remotely modern CAD. When I did some mechanical design, I wouldn't be allowed to do this. Might receive a call from the prototype shop asking me to clarify my intention,...


2

Omron makes a wide variety of industrial timer modules which can count down a preset number of tenths of a second all the way to hundreds of hours and then close or open a set of switch contacts and reset themselves. A new one from one of the on-line industrial supply houses might cost about 150 dollars new, or 20 to 40 dollars for a used one at an ...


1

I use this kind of thing frequently. The $50 price range is about right for 100mL ish, might be more if you are looking at 0.5L. The max design pressures are generally much higher, but that doesn't matter. You can buy such things from companies that make pneumatic accessories, and also sometimes companies that make miniature pneumatic cylinders (the "...


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