How would dimension this ?

[jkristia]

The last assignment in my AutoCAD 2D class before the final project is to draw a (simplified) pair of eye glasses and dimension them.

Now How you go about dimension this?

 

My idea was to have a viewport where I dimension the inner frame and then another where I dimension the outer, but as you can see from the image, just dimension the inner frame is really busy and difficult to read. I assume it is correct to select a datum point (??) and then go from there.

 

Any suggestion on how to do this ?

[Strix]

were you provided with those to draw, or could you choose your drawing too?

 

a wire frame pair with circular lenses would have been much easier to tackle!

 

what happens if you scale your glasses up considerably (change the viewport scale) such that the dims become relatively smaller?

[jkristia]

no I drew these glasses. I did consider drawing a pair of rectangular wireframes with some filleted corners but decided it was 'too easy' so instead I got myself into this situation. Drawing them was easy, but how to dimension them is the problem.

 

Jesper

[jkristia]

>>what happens if you scale your glasses up considerably

 

Something like this maybe ?

[Strix]

well it's a bit more readable, but it's still rather busy and a bit untidy looking

 

can you take all of the dims defining your radius centres right outside the frame and make them CONTINUED or from the same baseline?

 

Consider which dimensions you actually need to be able to construct this object - and you'll probably find that the strangely orientated distances from the ends of your corner curves actually don't need to be there

[jkristia]

>>but it's still rather busy and a bit untidy looking

Agree, Im still playing with it trying to come up with something better. Amazing it is so difficult to place a couple of dimensions !

 

>>and you'll probably find that the strangely orientated distances

True, the 4 circles connected with tangent lines is all that is relly needed.

[Strix]

Amazing it is so difficult to place a couple of dimensions !

dimensioning is something I've always struggled with too - mainly through lack of practice as schematics don't get dimensioned

[jkristia]

one more attempt.

>>can you take all of the dims defining your radius centres right outside the frame and make them CONTINUED or from the same baseline?

 

Moving them out certainly cleaned it up a bit. Not sure what you mean from the same baseline. I am dimensioning the position of the arc centers from the same base lines using the first R14 arc as the reference. I did first try to have all dimensions reference the datum point but it looked even busier. I added an X at the center points which I think makes it a bit more clear what the dimensions refer to.

 

Anyway, I appreciate your feedback, and I will continue playing with different layouts.

 

Jesper

[Strix]

your horizontal dims are all over the place

 

you should really either have them all from the same basepoint or all following on from each other, whereas you seem to have the first radius centre ref from the bridge, then a number of dims ref this first centre - which doesn't make much sense, visually or from a manufacturing point of view

 

Try moving 23.4 right down underneath the diagram, and then bringing the rest of the horizontal dims consecutive from that

 

Try having dims for the upper centres running from the bridge and locate them at the top of the model, but the dims for the lower centres from the arm instead, and place them beneath the model

[totzky]

How about using ordinate dimensioning?

[jkristia]

me again - with another attempt..

 

>>you should really either have them all from the same basepoint or all following on from each other

 

Like this? (I like this one better)

[Strix]

it's much better, but too many of your dim lines are crossing

 

see what it looks like if you take a different base point for the right hand radii

[wannabe]

Why dont you make some of the extension lines dashed. Say, all the verticle?

[jkristia]

another one - tryin the ordinate dimension as suggested

I just realize I don't know how to create multiple viewports in paperspace with different layers turned on, hmmm.. have to look for that.

[totzky]

Try the mview command.

[wannabe]

Just click on the view drop down menu and select viewports, then new viewport of the active model configuration, mate.

 

Then, from paperspace, click inside the viewport and then change layers to on or off etc. The changes should only apply to that viewport.

[merdrignac]

I agree with Strix. My advice would be to think hard about what dims you would require to make the spectacles and include just those. Also try to reduce the length of the projection lines. Will make it look less 'busy'.