Community Digest

Top new questions this week:

Why are many compliant mechanisms only flexible in the joints?

I've been playing around with 3D printing some compliant mechanisms, mostly to get precise linear motion, and I've noticed that many commercial compliant mechanisms are often designed like this: ...

design 3d-printing flexures  
asked by Beacon of Wierd 4 votes
answered by joojaa 4 votes

Non-standard Door Hinge Spacing

The usual woodworker/house builder rule of thumb is to place the top hinge 6" (150 mm) from the top of the door, and the bottom one 9" (228 mm) from the bottom - the common reason for this ...

door hinge  
asked by D Duck 3 votes
answered by kamran 4 votes

Improving ball feeder design

I designed this ball feeder for my robot however I'm experiencing frequent ball jams as the ball is stuck against the wall of the hole entry or just a ball being moved left and right not entering the. ...

mechanical-engineering motors design servo  
asked by Sterling Duchess 3 votes
answered by NMech 2 votes

Modeling Vehicle Acceleration - Simulink

Hello I am modeling a vehicle that has a seperately excited DC motor as the power plant utilizing the constant-torque and constant-power regions for traction. The acceleration is governed by the ...

simulink  
asked by james 3 votes
answered by BikerDude 1 vote

What is a 'rocker slab'?

See below for an extract from a general arrangement drawing from the 1980s. It makes reference to a '9" rocker slab' which appears to be a slab supported by steel beams. Does anyone have any ...

civil-engineering reinforced-concrete  
asked by egg 3 votes
answered by Carl Witthoft 2 votes

Determine the aceleration of points B,C and D, angular aceleration of rod and the tension in rope DE when ropes AB suddenly breaks

The solutions are F(DE)=134.38N, a(D)=2.016m/s^2 , α=1.29rad/s^2, a(C)=7.828m/s^2 I agree that the FBD and the KD are these: Then to solve this problem I've done: $$\sum M_{c}= I \alpha_{BCD}$$ $<=...

applied-mechanics  
asked by sputnik 3 votes
answered by NMech 1 vote

Can you help me to interpret technical drawings?

I'm trying to find out the angle/ length of the oblique line, or the solid angle of the conic part. This is what I've tried so far: According to the pythagorus theorem the length of the line is equal ...

mechanical-engineering pumps technical-drawing  
asked by Sam B 2 votes
answered by NMech 6 votes

Greatest hits from previous weeks:

What does "$\pm$ 0.5% F.S." mean?

I've seen it in several data sheets - it is a measure of error of some kind, of course. The problem is I dont know the exact meaning. I've seen it in the context of repeatability, accuracy and ...

nomenclature  
asked by John H. K. 10 votes
answered by Russell McMahon 15 votes

LO/LC, CSO/CSC Valve Definition

Does any one here know of an authoritative source (ASME, ISA, NFPA, OSHA, etc..) that gives a definition for the following in one of their standards or codes and the number for that standard or code: ...

mechanical-engineering valves standards  
asked by Jrican 4 votes
answered by morristtu 2 votes

How to define Knurl on drawing?

I made this kind of knurl on shaft : but I am not sure how to be define on the drawing. I found some examples but not sure if they are correct. On the examples there type (GV) and depth of knurl and ...

mechanical-engineering modeling machining  
asked by Stenly 5 votes
answered by Tawhiri Matea 3 votes

Gate width calculation for Passenger car design vehicle

I am trying to figure out the minimum gate width required for parking a car inside the house which has a 15 feet road in front of it. Please refer to the image below: Plot is 20 feet wide. I have ...

civil-engineering transportation  
asked by Whiskeyjack 5 votes
answered by Akter U Azim 2 votes

What is the meaning of vorticity and circulation?

In fluid kinematics I can't understand the meaning of these terms : vorticity and circulation. Can somebody give me a description of these terms so that a lay person can understand them easily?

fluid-mechanics  
asked by M.Tarun 11 votes
answered by Algo 10 votes

How to determine the characteristic length in reynolds number calculations in general?

I understand that the reynolds number is given by the expression $Re=\frac{\rho v L}{\mu}$, where $\rho$ is the density, $v$ is the fluid velocity and $\mu$ is the dynamic viscosity. For any given ...

fluid-mechanics  
asked by Paul 12 votes
answered by nluigi 7 votes

What material is used to hold molten iron in a furnace?

When iron is melted, I guess it has to be transported and contained. I think the container in which it is has to be able to withstand higher temperatures than what you want to melt. According to this ...

metallurgy  
asked by Martin Thoma 17 votes
answered by wwarriner 21 votes

Can you answer these questions?

Can someone please explain what a PT1 filter is in simple terms?

The context here is for determining how driveability filters are calibrated since most of them use pt1 filters to filter the torque demand.

control-engineering automotive-engineering  
asked by S_sp 1 vote

Bulk edit or script multiple DXF files

I have several hundred .dxf files that are all pretty simple rectangles with MText inside. I am looking for a way to, in bulk, convert the MText to Polylines (TXTEXP) without having to open each file ...

cad autocad  
asked by GeersJ 1 vote

What are the limits of small 3D printed gears?

How much tangential force should I expect a 10~20mm pitch diameter/1.5mm gear module 3D printed rack and pinion system to support without breaking nor sliding?

materials gears stresses 3d-printing power-transmission  
asked by curioso 1 vote
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