# drawing exercise question

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• 17th Feb 2017 06:29 am
solid654321
drawing exercise question
hi there, im newb and just starting CAD, i spent a whole morning still cant figure out how to draw this about the R30 arc part, does anyone could help me?

thanks!!

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• 17th Feb 2017 07:00 am
BIGAL
You know that start of r10 arc is 45 up so draw a circle r10 like wise draw a circle r10 20 up from botom move each of these top 10 right and bottom 10 left. Use "Circle" then type TTR, tangent tangent radius, pick circle 1, pick circle 2 then enter radius 30 use trim to clean up.

I am sure others will offer some arc solutions also but will still need the ttr option.
• 17th Feb 2017 08:16 am
solid654321
hi Bigal, thanks for reply, actually i have 2 questions of this exercise, the second one is the intersect point of 22 and 24 line at the middle right, if i draw the R30 as you said, i have to did it first.

thanks
• 17th Feb 2017 08:23 am
solid654321
And where are u start of this? the top 2 circles or the bottom 36 line?
• 17th Feb 2017 12:58 pm
ReMark
Re: R30 arc. Yep, as usual the student is given just enough information but not all of it. It happens in a couple of other places too. My approach was to tackle the problem from both ends leaving the last three arcs (R10, R30, & R10) for last. This is what I did.

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• 17th Feb 2017 01:08 pm
ReMark
"I get by with a little help from my friends." Joe Cocker

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• 18th Feb 2017 01:59 am
solid654321
hi ReMark, wow! its impressive!
very clear of way to do this!
you inspired me the thing could be solved by separate to different parts first,
thanks!!

but how could i know the construction line of the big circle intersect the line 22 and 24?
(i hope this is the last thing, haha)
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• 18th Feb 2017 05:53 am
BIGAL
Thanks Remark I was trying to think how to draw a simple diagram but you excelled doing the whole thing. Your diagram shows the 2 circles plus the 3rd using TTR.
• 18th Feb 2017 01:29 pm
ReMark
Quote:

Originally Posted by solid654321
hi ReMark, wow! its impressive!
very clear of way to do this!
you inspired me the thing could be solved by separate to different parts first,
thanks!!

but how could i know the construction line of the big circle intersect the line 22 and 24?

(i hope this is the last thing, haha)
Attachment 60677

Since I gave you the image in post #6 that provides the missing information to the three arcs on the left you could easily work your way down the left side, across the bottom then back around to the right and you should end up with the line that is 24 units long touching the OD of the largest circle.
• 18th Feb 2017 02:47 pm
ReMark
Maybe this will help. I apologize for the quality of the image. Basically your are locking the position of the geometry vertically by the distance of 45 units, establishing a temporary reference line then moving all the geometry until the upper end point of the 24 unit long line meets at the intersection of the OD of the largest circle and the temp reference line.

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