16 Replies Latest reply on Oct 27, 2016 3:00 PM by Loretta Stiurca

Dimension

Please check whether any dimension is missing. I have a problem in finding out the height of the teeth.

• Re: Dimension

If that was the only you were given, I think you are correct. The height appears to be missing.

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Not only height there are number of dimensions missing to sketch the teeth.

• Re: Dimension

I believe Jeff is right (I don't remember him ever being wrong).  If you had the length of this line then the tooth height would be driven by the overall dimension (the 360), but I'm pretty sure you need one of them.

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What can be the correct value to assume this dimension?

• Re: Dimension

Hi Maha,

If we assume that the distance between each of the teeth is the same, we can get to a fully defined sketch...

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(Here's a link to the part if you want to investigate further)

• Re: Dimension

I am unable to open you file.

There is a gap in your sketch.

There is no gap in my sketch. This is the problem I have.

• Re: Dimension

Hi Maha,

I saved the file in SOLIDWORKS 2017 SP0. If you are using an older version of the software, this is why the file I attached can not be opened.

There is an error in your sketch as is demonstrated below:

The 360 dimension actually refers to the "top" edge of the teeth - not the bottom, so this needs to be corrected first to find the correct dimension.

The gap of interest is fully defined by all other dimensions and relations added to the sketch - the height of the teeth does not need to be added in this case. However, we can add this dimension in as a driven dimension just to measure if we want to:

In this case, we can see that the height is equal to 18.81.

1. The distance between teeth is = to 10 (same as the top)

2. The distance between the edge and the first tooth is equal to the distance between teeth/2=5

3. All teeth are the same

• Re: Dimension

I use 2016-2017 student edition.

In my sketch distance measured between center line(C) and line(A) is showing 360.

• Re: Dimension

Hi Masha,

Based on the problem snapshot, this dimension is incorrect. It should go to the top of a tooth instead. I would recommend deleting this and re-defining it after drawing one tooth.

Best,

Loretta

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In order to achieve what you say dimension of this line should be lowered by 18.81. I wish to know whether it is correct to do so.

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Dimension of this line is not given as well.

• Re: Dimension

Sorry for the confusion. Although the dimension is not explicitly given, it is certainly implied through basic assumptions and geometrical relationships. He same goes for both of the dimensions you reference. Enough information is given. Does that make sense?

The way I know this for sure is actually using SOLIDWORKS. Underdefined sketches are shown as blue, while fully defined sketches are shown as black. As we can see from previous screenshots, the sketch is fully defined.

I hope this helps!

Best,

Loretta

• Re: Dimension

Reminds me of a theoretical problem from College, we were given something like this with a few key dimensions missing.

The object of this part of the course was implied geometry as you may encounter it in the field.

For school work I would look at the bottom of the tooth and "imply" equal length to the top of the tooth, since the part is symmetric the lands on the outside would be half or 5mm.

This would work if for no other reason you can discuss it with your instructor explaining how you got to where your model is.

One of the key fundamentals is problem solving and this would be one where I would pick the most logical approach and be prepared to explain it to your instructor on how or why you came up with what you did.