Any Engineers round here?

bro i am an Electronics Engineer we use OrCad mostly , but i know that focus is on computer aided modelling.
also i kne Few Mech Engg.who work on CAD.i am sending them ur questions.you can ask more if you want

I worked as a Draftsman from 1965 to 1973 full time, then part time from 1973 to 1980 as I had decided to change careers and become a psychologist. During that time all I did was hand drawing. Actually after a few years on the drawing board you stop visualising the whole item and focus on co-ordinates. It becomes very mechanical and more mathematical models instead of sketches. The only advantage hand drawing has over CAD is that in the final drawing of a rendered presentation drawing, you can let your artistic ability shine.

Side note those multi view sketches are isometrics and are actually mathematicaly projected perspectives based on specific formulas. A good draftsman is actually more skilled in trigonometry (plane and spherical) then in artistic perception.

wow thanks alot for that,
woodrow that's pretty heavy working as draftsman for all that time,
what do u mean you begin to focus on coordinates? is that some technique to visualise models?

also isnt it very important to visualise a 2D sketch as a 3D model so u can figure out where hidden lines and features adn all that stuff suppose to go?

najiullah thanks alot for the offer, that would be great if they hav time :thankyou: i suppose orcad is more of a circuit modelling software rather than actual 3D geometric modelling... i'd love to learn autocad coz it's very "Standardish".. atm i trying to learn it abit (but the learning curve seems steep) and for now i use solidworks.

thanks alot man really appreciate, rep for each of u

ps: that's a very unusual shift of career from mech to psych, i guess coz mech is a bit of a stressful career? too much expectation from a boss who prob is a dropout himself? kay: lol

format_quote Originally Posted by lolwatever

wow thanks alot for that,
woodrow that's pretty heavy working as draftsman for all that time,
what do u mean you begin to focus on coordinates? is that some technique to visualise models?

also isnt it very important to visualise a 2D sketch as a 3D model so u can figure out where hidden lines and features adn all that stuff suppose to go?

najiullah thanks alot for the offer, that would be great if they hav time :thankyou: i suppose orcad is more of a circuit modelling software rather than actual 3D geometric modelling... i'd love to learn autocad coz it's very "Standardish".. atm i trying to learn it abit (but the learning curve seems steep) and for now i use solidworks.

thanks alot man really appreciate, rep for each of u

ps: that's a very unusual shift of career from mech to psych, i guess coz mech is a bit of a stressful career? too much expectation from a boss who prob is a dropout himself? kay: lol

LOL you have to remember when the draftsman begins the drawing the prototype does not exist or you do not see it. What you get is a list of specifications as to what the thing is supposed to do. From there you begin with the basic design drawings. Using the design drawings you begin calculating the materials that will go into it. After you finaly get what looks like a workable design drawing, you go ahead with a presentation drawing to show what you believe the finished model will look like, Then you disassemble it on paper. Do your assembly drawings. Then you go ahead and start making the shop drawings and the fabrication drawings. From those the purchasing department will order materials to make the thing, the shop will fabricate the individual parts and the field(or assembly line) will put the whole mess together.

Actualy the shift from Draftsman to psychologist was one of my easier career changes in my life LOL. Started off in my work life as an AF pilot. Got severly injured and had to change to a sedentary career. Drafting suited me as I already had a trig background from navigating the darn bird. Psych just sort of fell in line. I did not know if I wanted to pursue Psychology or Biology, so comprimised and ended up as a Physiological Psychologist. Been retired for the past 15 years now. Got to retire early because of health problems. Old AF injuries finaly took their toll.

format_quote Originally Posted by lolwatever

Does anyone do mech eng around here?
if so umm is the focus on computer aided modelling in future years or do they expect you to use the olden day 'hand drawing' multiview sketches and stuff?


just out of curiousity.. today everyone loves thier CAD... oh and onneeee more question, what CAD software do u use?

Salaam bro i just fwd ur question to few friends ,one of my friends has responded (maybe he didnt understand ur questions), Insha'Allah my other freinds will reply too.




aasalam alakum


First of all all your friend has a genuine question. He has every right to
be concerned about today's engineering practices been carried out in the
industry and the things that are taught in the universities today.

My friend, no matter how much technology advances in the industry regarding
engg. drawings, the basic principles are very important to understand which
are right taught in the universities.

Yes, there is extensive use of the hand drawing in the industry but most of
them are the responsibility of AutoCAD draughtsman .. who are like computer
CAD boys hired specially to draw them on paper and on CAD.

Today's engineer only gives the conceptual diagrams to that draughtsman ..
who works with the engineer to make final copies on the CAD. Yes, there are
industries where there are no draughtsman .. and the engineers have to make
first paper or CAD drawings and have them reviewed later.

Actually our universities teach us all the basic skills been used 'out
there in the industry' .. the usage depends upon the kind of job a graduate
engineer lands upon first. If its a Project engineers job then there is
extensive usage of CAD, if he starts with a Maintenance engineer's job like
I am in right now then there is no extensive usage of CAD drawings but yes,
the usage of hand made drawings and that is because hand made drawings dont
take too long to make. We have like a graph papers and we make a rough
sketch of the machine part we want its final drawing to be made and then
send it to the CAD draughtsman who then make their final CAD drawings. One
reason why every engineer doesn't work directly on CADs is because in the
real world .. companies dont buy licences for every engineer.. they just
buy a couple of CAD software licences and then have one engineer or a
draughtsman .. use them for every job.

There is no 3D paper modelling done in here .. nor is there 3D modelling
done on CAD atleast not in the industry I work in, which is a like a
maintenance engineering for a process plant. Companies who are making parts
or where machines are been made may be using such extensive models.

On the question of which software are been used .. there is extensive usage
of AutoCAD.

I'll end this by saying that tell your friend to never take granted any
thing that is been taught in the industry. To be true, the subjects that I
thought were the most boring are been used the most in the industry. Like
this engineering drawings, Materials Management etc.

Make the best use of his time and make studying harder his prime goal. You
cant imagine the results that are gonna come to him out in the real world
if he is prepared.

I use AutoCAD

Najiullah
thanks alot for that man, reallly appreciate it , sorry for such a late response.. had a fair bit on my plate recently.
Engineering is weird, u can endup anywhere with it pretty much... From a draftsperson to modelling fluid dynamic sims for some nasa spaceshuttle lol

Muslim_friend.. i feel for you, its so boring... CAD is cool, butttt its also annoying when the software features limit ur creativity... or when you have something in midn that either you cant, or dont know how to implement CAD wise..

thanks alot alll! really appreciate it.

PS: yuck that ": D" emo looks so unclean lol

format_quote Originally Posted by najiullah

bro i am an Electronics Engineer we use OrCad mostly , but i know that focus is on computer aided modelling.
also i kne Few Mech Engg.who work on CAD.i am sending them ur questions.you can ask more if you want

salamz bro can i ask u a question since ur an elec eng?

I got this real ugly problem with circuits.. i don't really understand how they assign vectors to voltages? like.. what does '-5V' really mean? And what do voltages 'in opposite directions' really represent? say u hav tow resistors, but the vector directions of the voltages across each of them is pointing in opposite direction... that's stressing me.

and when you apply KVL (Kirchoffs Voltage Law) to a closed circuit (loop), containing two resistors and one voltage source,

R1 has voltage of -5, resistor 2 is unkown and the Voltage source is 12V...

when i try to calculate voltage across resistor two.. i thought i'm suppose to say:

Vs + V1 + V2 = 0
12 + (-5) + V2 = 0
V2= -7

But in the back of the book its got +7

i dont get it lol..

ne help pls? i guess i could plug this in physics corner.. but i dont think A level ppl do this stuff?
jazaks

wrong thread

format_quote Originally Posted by lolwatever

what does '-5V' really mean?

isnt it that the resistor will dissipate 5 joules per coloumb? the minus meaning that energy is dissipated rather than being provided to the circiut?

i cant see how they assigned a positive value to the resistor given that it doesnt supply energy to the circiut..