Engineering drawing.

- TrojanPoem

Engineering drawing.

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- TrojanPoem

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- TrojanPoem

I am stuck with the circle with unknown radius notice that's my first drawing

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- TrojanPoem

@phi

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## More answers

- BAdhi

R1 = 70 + 25 ( the circle with R1 and circle with 25 has the same tangent when they meet)

- BAdhi

\((R_2+R_1)^2 = (R_2+30)^2 + 120^2 \) can you guess how i got that?

- TrojanPoem

Trying.. to find the tangent :/

- BAdhi

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- TrojanPoem

Isn't this part an arc ?

- BAdhi

ok the arc is an part of a circle. ill use arc then
when two arcs with different radii meet together, for them to have a smooth connection, the tangents of the each arc has to be same.
Sorry i have circled it little bit to the left. refer the below diagram

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- TrojanPoem

|dw:1444304019186:dw|
Excuse me, but that's the first application of open belt, cross belt, .... etc

- TrojanPoem

|dw:1444304295640:dw| Maybe the radius if is > than 25 +70

- phi

what are you suggesting? BAdhi seems to have the right idea.

- BAdhi

circles overlap

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- TrojanPoem

I know , he 's right, but I can't understand him

- phi

The curve has only one straight line, so all the places where the curve changes direction must be where the radii "line up"

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- TrojanPoem

Got it, I will try to plot it. and see the result

- TrojanPoem

from Pythagorean Theorem

- TrojanPoem

That's how you got (R_2 + R_1)^2 = (120)^2 + ( R_2 + 30 )^2

- phi

He found R1 to be 95

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- TrojanPoem

I never thought we'd use Pythagorean in engineering drawing -,-

- phi

Yes, if angle at M is 90 deg (I assume it is)

- phi

Pythagoras is one of the GREAT theorems. It pops up all the time.

- TrojanPoem

A circle with 95 radius doesn't tangent -,-

- phi

what do you mean ?

- BAdhi

Is this CAD or hand drawing?

- TrojanPoem

@BAdhi Unfortunately, hand drawing, the professor said "You all should master hand drawing before moving to Auto CAD."

- TrojanPoem

Thanks guys, SOLVED. Should I write down the figure the steps of how I got R2 ?

- phi

Yes, I would like to see the solution

- TrojanPoem

Here you go

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- BAdhi

Hand drawing is fun.. of course after a little bit of practice.. its kinda become an art ;)

- TrojanPoem

@BAdhi , Do you suggest any improvements to the drawing ?
I am stuck a bit in analyzing some drawings to re-draw them, is there any tutorials regarding this concept on the internet?

- BAdhi

well for starter, never redraw a path that is drawn using a tool again with use of the free hand. I see that youve done that for curves

- BAdhi

well sorry I dont have any material in the internet that i know of :(

- TrojanPoem

@BAdhi , I didn't think you will notice xD, I was trying to highlight the main lines , by using heavy lines.

- BAdhi

thats another point.. all the lines should be with the same intensity :P. so make sure if you cannot make the curves darker, make the straight lines and others a bit lighter
using correct type of pencil (HB, 2B etc.. ) can help on that too

- TrojanPoem

Thanks for your time @BAdhi .

- BAdhi

you are welcome :)

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