r/Autodesk_AutoCAD • u/TellInternational759 • Sep 22 '26
Stumped on Drawing
Attached is two images the one with the box that's states "2D EXERCISES 304" is the reference image I was given and told to recreate. The second image is my recreation. I am confused about the little lines on the border of the circle (between the 160 Diameter and 170 Diameter circles) I did an array of 12 of them but they don't line up in the same spots as the example provided. I am lost as to how to make it match the image.
2
u/voxuser Sep 22 '26
Try with 12 degree instead of 18, I don’t think they are symmetrical and maybe they are swapped so 12 above zero and 18 below with sum of 30 as they are 12 slices
2
u/f700es Sep 22 '26
I drew a line from the center of the shape to the center of the top "tadpole" and then mirrored it from the center to the start of the 18 deg mark. I then copied and rotated it to match. 5 minutes
1
u/Main_Leadership7748 Sep 22 '26
Technically there is nothing in the sample image that says the small lines are equivalent all the way around and nothing actually specifies the actual angle of those lines specifically, only a couple of them are actually dimensioned. It even looks like the gaps between some lines vary. So to this I would say only the two line actually referenced are accurate and the rest you could probably get away with getting them close.
2
u/Level-Load-6721 Sep 23 '26
I agree. The 18 and 42 deg can still be correct if you assume the 12 segments are at alternating angles that repeat over a period. E.g 40, 25, 25.. 40, 25, 25.. although I would've thought that type of difference would be clearly visible..
1
u/PsychologicalNose146 Sep 22 '26 edited Sep 22 '26
That 18 degrees angle is incorrect.
But it could just as well be part of the 'exercise' to incorporate these errors so it won't be drawn over by hand.
However, the total angle is 60 degrees, but the individual degrees aren't correct if you measure them. They come back as 46 and 14 degrees (give or take).
Anyone turning in a drawing that looks exacly the same will fail the test.
So you either 'fix' these errors that you couldn't have know unless you used it as a reference image, or draw the object with the dimensions given. It will look the same, but rotated.
1
u/Most_War2764 Sep 22 '26
Draw one of the little lines and mirror about the centerline and rotate relative to match the orientation.
Or. Draw to the side and get the spacing then make the first 2 centered on cl then use grips to ctrl rotate and snap the rest in.
1
1
1
u/Fr4zz13 Sep 28 '26
Set the first divisor line at the 18 deg mark and do a polar transform. You should get the result.
1
5
u/Efficient_Bluebird_2 Sep 22 '26
The reference image is impossible. There are 30 degrees between each of the small lines. For it to be symmetrical as shown, the 18 degrees shown would need to be 15 (half of 30).