# Questions tagged [mechanical]

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104 views

### Z-axis auto adjusting fixture device

I am looking for a mechanism that would allow me to support a fixture attached to a 3-axis motorized stage. I have attached a picture of my current design. I trying to design/incorporate some sort of ...
189 views

### Heat transfer Calculation, for Cooling for an aluminium box

To go into more detail, I basically have a controller and its housing is basically an aluminium box that I need to add heat sinks to. But first I need to calculate how much heat is being dissipated by ...
271 views

### Polarity of a relative angle - Knee joint angle

I'm wondering if it's correct to write: $$\alpha = \theta_{lg} - \theta_{th}$$ EDIT: the theta angles are defined positive in counter-clock direcction, instead alpha in clockwise direction. My ...
35 views

### Peltier Module Set up isn't cooling

I have set up a peltier module with an aluminium heat sink, cooling fan, 12v, 7ah battery supply and thermal paste for the purpose of cooling water. At first, it performed well. It dropped down to 3.5°...
28 views

### Number of Kinematic Pairs

Kinematic pairs are the connection between 2 links that can have relative motion between them. But In six bar chain as shown below: There are five pairs for them to be a kinematic chain. But if I ...
69 views

### How can a mechanical pocket watch wind itself from movement, and does it really get damaged if wound “too much”?

Today I received the mechanical pocket watch that I had recently ordered. It was this one: https://www.trendhim.se/guldfargat-mekaniskt-retro-fickur-p.html#full-gallery I find it extremely fascinating ...
103 views

### Reacting Propeller Torque?

A motor is used to drive a shaft that is geared through 1:1 bevel gears to a propeller. The shafts are mounted on bearings in a hard casing that is attached to a 2nd ground. I want to know if the 2nd ...
329 views

### Calculating max weight capacity of brushless motor

I am having trouble determining the maximum weight capacity a motor can handle. I provided the specs below. The calculations are for the top row or the 580KV model. So to start off,I'm only taking ...
156 views

### What are fluids or “goos” called, that increase friction?

I have a shaft inside a bushing, the shaft has a gear on one end that is supposed to provide resistance to other gears it is driven with. I'm having a hard time finding the correct term for the sort ...
332 views

### Quick return mechanism for spring-loaded screw

Looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a screw ...
31 views

### compute the maximum resisting torque that can be overcome by the system at the shaft axis

A 2Nm motor M is used to drive the system through a gear drive and a chain drive. the overall reduction ratio is to be between 16:1 and 18:1, and at an output speed of 6rpm.
75 views

### What is this mechanical pump called?

I am unable to find it again but I once heard of a type of air pump that involved a pair of offset archimedes screws inside a cylinder. The point of the device was that as the screws would turn ...
64 views

### Professional threaded insert in plastic?

I'm getting some plastic parts (made with HDPE) CNC machined. A few of these parts require the addition of threaded inserts. I've printed the parts myself using a 3d printer and when I add the ...
29 views

### Shape of the shaft of knurling device

I'm trying to design and simulate a simple knurling device. The shaft ( blue part ) has a flat surface at the other end, where the small grey pin connect the green body to the shaft. I guess you can ...
35 views

### Specifications of Tensile Test Specimen?

I am Currently Working on Measuring Various Mechanical Properties of Metalic Materials using Universal Testing Machine (UTM) at Various Temperatures. I know that for Testing at Ambient Conditions, ...
43 views

### Design a Jig and Fixture for 3-axis CNC Milling Machine

Newbie Here!!! This is my assignment task. I am required to design a Jig and Fixture for 3-axis CNC Milling Machine. The workpiece will be a simple aluminium block and it will be cut and shaped into a ...
179 views

### How do I calculate the force coming from the centrifugal compressor exhaust?

Let's say I have a centrifugal compressor as shown in the figure and I know the following parameters----1 Thrust Inlet and outlet pressure Power required to operate the compressor Inlet and outlet ...
100 views

### Calculate Torque Required

I am working on a school project that requires me to build a machine. I have designed the machine but I am stuck at torque calculation. The problem goes like this, the machine supposes to rotate a ...
52 views

### how many power stroke in 3 cylinders, 4 stroke at 3000 rpm?

According to some answers, in 3 cylinder , 4 stroke we have power stroke each 240°, as we have 1500 rev. Of 720° in this rpm, so we will have this: 1500 x 1.5 = 2250 power stroke at 3000 rpm, is it ...
56 views

### Transmission for variable-speed flywheel to output a steady output speed?

If you had a flywheel acting as a mechanical battery in an all mechanical system, such that you could pump energy into the flywheel up to a desired speed and then slowly drain its kinetic energy - ...
38 views

### What is this object?

In framing the question, I can't be more specific as I have no idea (though a suspicion) about what this came from. I have a number of them that are several different diameters from 125mm to about ...
24 views

### Way to keep object on linear rail in the position you leave it in despite smaller external forces?

Problem: I have a rod on a linear rail system. This rod can be pushed forward or backwards. There is air blowing out of the front of the rod (~2 lbf) causing it to move to the back position by default....
215 views

### Pivoting trailer gate on multiple axes

I am currently trying to design a rear gate to retrofit to an existing caged trailer (similar to image 3), with the goal of having a system where the rear gate can pivot down (on its bottom edge) to ...
47 views

### Motor sizing for modelling

Im working on a headrest for a car that will electrically adjust up and down and have drawn up my plans. it now comes to the important questions, such as what motor to use. Ive been looking at motor ...
32 views

### Identify bearing dimensions from its bearing number

In motors/pumps generally following bearings are used (ref: https://www.nke.at/en/bearings-applications/applications/electrical-motors): Deep groove ball bearings Cylindrical roller bearings Angular ...
10 views

Yesterday my Lee powder dispenser to my reloading press popped off gunpowder everywhere I had removed the top part of the container off and placed it back on, there is a "on" / "off&...
49 views

### Do you know any mechanism that can pass a thread through several holes?

Well i am stuck trying to figure out this problem, actulally i see a machine that can make it with a torus, a torus coilling machine. But that not work with a multi turus shape. I want to automate ...
26 views

### Tiny sliding mechanism

I have been trying to build a sliding keyboard phone attachment for a while now, but can't seem to get anywhere. Basically, I want to combine my Moto Z Play with this cheap, generic bluetooth keyboard....
30 views

### ABAQUS: How to connect a shell edge with a shell face?

I'm performing a buckling analysis of a stiffened aluminium panel. The panel and flatbar stiffener(2) is created as one 3D shell extrusion. The T-stiffener (1) is another 3D shell extrusion. How do I ...
25 views

### High articulation joints

Looking for advice or suggestions for high articulation joints (>57°) for an automotive halfshaft. Peak operating conditions are in the ballpark of ~1000RPM, ~300ft-lb torque. I've considered u-...
296 views

### What is a purpose of learning G-code?

I might be wrong here. The solid modeling done in CAD like Catia, NX, Solidworks,etc can be taken as input in CNC and the desired shape and size of piece can be obtained.The CAD itself convert the ...
98 views

### Fusion 360 animation , contact sets

I was designing a whit-worth quick return mechanism, I have provided the contact sets but they fail when I try to animate. The contact set is defined for the crank and slotted link.
39 views

### Latch design for home exercise equipment [closed]

I have a latch design problem and need your help - many years in software engineering aren't helping me much here! Two pieces of 60x30mm RHS become parallel/adjacent (on the 60mm face), with a 5mm gap,...
38 views

### How can you convert 180 rotation into two separate motions?

I have a small servo that can rotate 180 degrees. I would like to get two different connected parts to move at different times, one part moving while the servo is between 0-90 degrees, the other part ...
164 views

### How does a two dimensional elevator work?

If you watch this video, you can get a sense of how an elevator can operate in two dimensions. But, what I can't figure out is how it is driven. If you consider a conventional elevator, there is a ...
268 views

### Explain tolerances in technical drawing

I'm not a mechanical engineer and am not used to looking at mechanical drawings. I'm trying to understand what these tolerance features mean. There is a positional tolerance feature, which ...
62 views

### Bending moment when there are no constraints

I faced this problem in an old book (Hall Allen S., Theory and Problems of Machine Design; 1961) The answer according to the book is 592 [in.lb], but I think the bending moment should be 0 because ...
59 views

### Most efficient orientation of exhaust vents on top plate of chassis for air flow with regard to heatsink fins?

I'm looking for some advice from an ME or anyone who understands heat transfer,convection, etc. I'm currently laying out in Inkscape a top panel for an audio amplifier I'm building. Now, my question ...
540 views

### One way/locking mechanism without springs or flexible members

There a few neat mechanisms that allows only one way motion without the use of a pawl or ratchet. This is one of them: https://www.instructables.com/id/LEGO-Technic-One-Way-Gear-Mechanism/ What I'm ...
26 views

### Arrow on Activity (AOA) Network Diagram

I have question-related to industrial management, actually, it is a problem on arrow on activity network diagram. I tried to solve the question my self, below are the images. If I did any mistake ...
71 views

### How is motor torque related to capstan equation?

I know that capstan equation relates $T_{in}$ and $T_{out}$ as $T_{out} = T_{in}e^{u \cdot F_c}$, where $u$ is friction coefficient and $F_c$ is wrap (slip) angle. In my situation, the capstan is ...
51 views

### Is there a way to convert a short throw in one direction into a long throw in two directions

I have a motor that I have created a simple adapter for; this lets us attach any parts we might design to solve the final problem: I would like to convert the motors motion to oscillating motion in ...
71 views

### Regarding design of a compressed air delivery system based on a screw air compressor

I want to select a screw compressor for my application wherein I need a pressure of about 18 psig, and 300 cfm at the aforementioned pressure. The compressors I'm finding suitable for the system have ...
30 views

### Can we coat brass with nickel by peen (mechanical) plating?

Is it possible to plate brass conductor with aluminum by peen plating?
14 views

### Is inverse hall-petch relation valid crystals larger than nanocrystalline?

The image shown here is of ceramics, where they varied the grain size and measured the strength. For example, let's take Al2O3. There we observed that strength first increased from 3 μm to 95 μm. But ...
66 views

### Making a machine to sort out old bolts, washers, nuts etc in workshop

I spend a lot of time in my workshop sorting out and putting back into their boxes bunches of screws, washers, nuts and other assorted niknaks and I want to make a machine to take this chore off my ...
26 views

### What are the characteristics of a motor that will generate current and is powered by a 30 cc, 2-stroke small engine?

Problem: I am trying to hobby-build a generator using a (old, working, throw-away gas, yard blower) 30 cc, 2-stroke engine. The 2-stroke engine will spin a motor and I want the motor to generate DC ...
70 views

### Airsoft BB Funnel Design - Electric funnel jam solution?

I'm working on a design to feed Airsoft BB's through a funnel. A simple gravity fed system (ie. I don't want to force them out at speed) but every now and again the BB's get jammed at the end of the ...
Could you please tell me why the singularity function is one when x=0 I mean $<0> ^0=1$ Thanks you in advance