Onshape Instructor Kit - 1.2.2 I'm stuck

benjamin_spencer

So I have done 1.2.2 at least 10 times. and I keep coming up with the same answer 593914.627mm3
but it is telling me that is wrong. what am I doing wrong

fastwayjim

I got the same answer as you... so either we made the same mistake, or perhaps there is a typo?

noa

Hi @benjamin_spencer and @fastwayjim, I get the same answer so we'll look into it more and likely fix it.

Thanks for finding this!
-Noa

david_cushing

I've done this with 2 outcomes one with "1 part" and another with "2 parts". Both didn't work. My '1 part' mass was almost the same except the xxxxxx.627 was xxxxxx.598. Off by 0.029.
Since MANY people are having problems with this they will make a public announcement about the fix.

jakeramsley

593914.627 mm^3 is if you create one part.  If you look at the first image, it is clearly two separate parts.

john_wolter

To elaborate on jakeramsley's post.  When you extrude for the second part, be sure to click on "New" in the extrude dialog to create the extrude as a new part.  I was getting the same answer until I figured this out.  Perhaps the exercise instructions or the answer key should point this out as a common mistake.

david_cushing

I moved on to part 2. I will come back and do this one again to see if I can get it right the 2nd time around. I did notice in one of the videos in part 2 that they mention how to make an extrude into a 2nd part. Not sure if that was covered in any of the part 1 videos. I will see when I go through part 1 again.

noa

@jakeramsley is correct. When you select New rather than Add in the Extrude, you should get 50865.396 mm^3, which is the correct answer. Everything is fixed in the online version (Introduction to CAD Series) and will be fixed in the downloadable Instructor Kit soon.

david_cushing

Tnx @noa for the answer.
Downloadable instructor kit?? Sounds cool.

noa

It's the same content but in a downloadable form meant for teachers and classrooms. Feel free to take a look here (just keep in mind we haven't added the fixes yet).

noa

Just leaving a note that the Instructor Kit is all up to date (as v1.10).

brian_guan

Very weird. My answer is 50865.397 mm^3 while the official answer is 50865.396.  I think it is just floating point error. I wasted time by redoing the exericse multiple times... Can't we account for this sort of floating point errors by using accuracy tolerance of e.g. within 0.01mm^3?