Isometric Drawings & tolerances

[J-Rod#1]

 

this is my first post so deal with me lol

 

i am at school and we have to draw an isometric drawing of a screw

 

Title: Screw

Material: SAE 4320

Inch

 

and it is kicking my ass! i dont know how to draw the screw head for one

2) the dimensions are in tolerances and i dont know how to draw using tolerances

 

can someone help?

[J-Rod#1]

ok if i have a drawing in front of me i can figure out how the tolerances

 

but my problem is, is when they give me a drawing with tolerances as the dimensioning. how do i read tolerances and draw them in autocad

 

is there a section on here where i can learn about tolerances and geometric dimensioning? yes im a noob lolo:)

[Strix]

I'm taking a wild stab at this being in 3D? or is it 2D?

 

anyway - tolerances you draw by being specific, then it's when you dimension you alter the DIM settings to display the tolerances

 

If you can't draw the head, how are you coping with the screwthread? That's the bit that'd have me hitting the undo key frequently!

[Strix]

hey noob

 

I'm shifting this post into your other thread as I've just replied to that question :wink:

[J-Rod#1]

lol sorry i didnt know how to explain it

 

the picture in the book is drawn in isometric vew, and i saw that the screw head had tolerances for the dimensions, like it said

 

.062

.098

 

edit: the tolerances is drawn on for the width of the head, it had the diameter, but it has it also for the length of the end of the screw, its a flat-head screw so it gave the width & heigth of the indention but its all in tolerances, how do i read it, so that i can draw it like the book?

[Strix]

ah, now when you said tolerances, the way we'd write them is xxx+/-yyy which would be a heck of a lot easier to deal with, as you'd just draw xxx and ad the yyy text into the dimension text

 

Judging by the figures you're giving there, you should work out the midpoint of those two figures and draw that

 

if in doubt, check with your tutor

[J-Rod#1]

ah, now when you said tolerances, the way we'd write them is xxx+/-yyy which would be a heck of a lot easier to deal with, as you'd just draw xxx and ad the yyy text into the dimension text

 

Judging by the figures you're giving there, you should work out the midpoint of those two figures and draw that

 

if in doubt, check with your tutor

 

 

oooh i kinda get it now

 

everytime i ask my teacher something, i feel like a dumbass for asking, since im so young and everyone is old lol ill ask to MAKE sure but i get it enough to finish my work for the night, thanks, ima be here ALOT asking questions

[Strix]

hey, you look more intelligent asking sensible questions than you do slaving away on something that's wrong and you have to redo!

 

btw - it's always best to check with a tutor how they want things done, coz some of them have some very strange ideas about how to draw, and you could lose marks for doing it our way

 

many tutors learned AutoCAD on much earlier versions, and have refused to learn to do things with the updated commands, so coming here is a good way to make sure you learn as many options as possible, but still hand your tutor what he wants

 

... and you'll find drawing standards and practices vary a lot between countries and job fields, so there is often more than one answer for that reason too

[J-Rod#1]

oh i will, thanks!

[Tankman]

lol sorry i didnt know how to explain it

 

the picture in the book is drawn in isometric vew, and i saw that the screw head had tolerances for the dimensions, like it said

 

.062

.098

 

edit: the tolerances is drawn on for the width of the head, it had the diameter, but it has it also for the length of the end of the screw, its a flat-head screw so it gave the width & heigth of the indention but its all in tolerances, how do i read it, so that i can draw it like the book?

 

Perhaps give this a shot.

 

.098 - .062 = .036

.036 / 2 = .018

 

.062 + .018 = .080

 

Now, the tolerance.

 

.080 Ø ± .018

Min .080 - .018 = .062

Max .080 + .018 = .098

 

Therefore make the screw head .080" Ø (I assume you're working in inches).

 

To type ± (plus or minus) - Alt + 0177. That's .

To type Ø (diameter) - Alt + 0216. Nice.

 

If on a laptop, be sure your number lock is on when typing symbols.

[J-Rod#1]

Perhaps give this a shot.

 

.098 - .062 = .036

.036 / 2 = .018

 

.062 + .018 = .080

 

Now, the tolerance.

 

.080 Ø ± .018

Min .080 - .018 = .062

Max .080 + .018 = .098

 

Therefore make the screw head .080" Ø (I assume you're working in inches).

 

To type ± (plus or minus) - Alt + 0177. That's .

To type Ø (diameter) - Alt + 0216. Nice.

 

If on a laptop, be sure your number lock is on when typing symbols.

 

 

if we were on another forum i would rep you lol, THATS what i was looking for, thank you so much, i really do appreciate all the help, tolerances are not my friend

[Tankman]

if we were on another forum i would rep you lol, THATS what i was looking for, thank you so much, i really do appreciate all the help, tolerances are not my friend

 

TANKS J-Rod! FYI, did work in Freeport, TX for a few chemical facilities. Small world.

[J-Rod#1]

i love this website lol ^^^ thats crazy, yeah FPT is know for Dow & BASF, i hope to work for one of them

[Strix]

here, hang on, from your first post I'd assumed you knew how tolerances worked in real life!

 

sheesh, here's me trying not to mollycoddle unnecessarily!

 

Glad you're all sorted now though