Latest threads in ⚙ Mechanical Engineeringshow only best voted threads

Subject Author Posted Replies
 
Bolt shear strength
Hanging a 4 x 8 foot, 3/4" plywood tool board. What are the shear failure ratings for common 5/16 and 3/8" lag screws? IOW, how many bolts per each 100 lbs load would be needed to provide a worry-free...
26
26
 
Interplanetary spit...
Okay, suppose we MEs want to launch our own type of spacecraft. What about pumping up a great wad in which the cargo is imbedded, and launching a big "droplet" into space? No need to worry about...
 
Mixers & Blenders
Are there any particle mixers more sophisticated than say, a double cone blender? Anything that guarantees a 100% uniform mix? Bret Cahill
 
Could an molten Earth tunneler really be built?
Really bad sci fi movies aside, has a tunneling machine ever been designed to heat rock to the point of it being pliable, push it away, and make a tunnel at the same time? As for heating the rock,...
25
25
 
hydrostatic bearings questions
By that I mean bearings similar to those found on an engine's crankshaft. I'm looking for ways to determine how much oil (gpm) will be needed, viscosity, clearance, and how large the bearing surface...
2
2
 
Tube bending tips required
Still trying to chase the perfect bend in high tensile, thin wall aluminium tube (6061 T6). Using an 8" fixed former and a section bar pressed by a lever and bearings I can get OK bends. I see bends...
11
11
 
Professional Engineering License
Has anyone out there recently taken the Mechanical Professional Engineering Certification test? If so, did you use Lindenburg's 11th edition handout of solved problems? I would be interested to hear...
1
1
 
Total Dynamic Head
If I have completed a pump test in the field on a centrifugal pump, and I have determined for example that the pump is delivering 100gpm @ 50', and I know that the specific gravitiy of the fluid is,...
3
3
 
PE Exam
Hi I am new to the group. I recently passed the FE and I am wondering what states besides Colorado allow EITs to take the PE without having a few years of quallified experience first. Thanks, Mike
1
1
 
Controller Tuning Should Have a Purpose! (Booklet and Software)
Before you tune, you should know what you are trying to do. Are you trying to draw straight lines, ie, minimize deviations from setpoint? Perhaps there are no serious upsets and you could be satisfied...
 
Tyre grip.
I'm having an argument about whether narrow tyres are safer than wide tyres on cars. I always understood that narrow were safer, but that they were made wider for comfort and fashion. I believe that...
1
1
 
The Origin and Definition of Simple Machines
Hi everyone, I'm looking for who originated the term "simple machines", what the precise definition of a simple machine is and if this classification provides any relevance to modern mechanical...
2
2
 
hartman's loop
does anyone have a schematic layout for hartman's loop? for chilled water piping? by the way does anybody knows what does "DDC systems" in relation to building management systems thx -- Hasta Luego...
1
1
 
Re: engine efficiency questions
There is a high dependency on duty cycle when looking at real world efficiencies. For instance, if there is a significant amount of time that the engine spends idling between full power operation,...
 
Re: What is #4 4PL ?
Ron, Thanks a lot! Kind regards Eddy