Model based tolerances

[PinRudolf]

Good day everyone!

I would like to request a new function for placing tolerance based dimensions in our 3D Models. I am hoping this option will give me the possibility to easily check tolerance stacks, give me a better workflow since I won't have to go back and forth between drawing and model when designing the tolerances and an option to easily send models for CNC milling without manually having to change dimension to the median of the tolerance. This idea is mostly based on the Inventor model tolerances.

Of course adding a tolerance to your 3D model might be achieved in many ways but I would like to illustrate one:
I feel like Model-tolerances might be relatively easily added by having some extra columns in the Parameters menu for the upper and lower tolerance, plus the current preview per dimension. I'm hoping the following mock-up will illustrate what I have in mind:

Most of the time you would not want to add any tolerances so simply leaving the options blanc would be fine. Or you might even choose to hide the tolerance options all together. 

Some other changes would be nice to easily work with this new functionality:

• I would like to quickly name parameters to find them back easily in the parameters menu. (Also see this and this idea) This might even be expanded to the possibility for typing the tolerance behind the value. For example: "100 +- 0,50 mm" or "100 +0,7 -0,2mm" or "100mm h7". I would like to be able to place these in sketches and features.
• Being able to use the interference check for maximum and minimum tolerances to quickly prevent simple fitting error. 
• Of course it would be fantastic if then the drawing environment would be able to extract this data and use it when dimensions are being placed.
• In the CAM-workspace i would like to be able to choose the current modelview to be on the Median value (or lower/upper). The same counts for exporting files to the 3D printer or as STEP-files. (As in most cases I would not actually mill the components myself)

Although tolerance inspections can go much further than the above solution I think it would fit Fusion to keep it simple in use and easy to learn. The above is just one solution but the main idea is that i would like some way to add and work with tolerances in my 3D model.

[albertson.chris]

Yes tolerance is important and I agree it is a required feature.    But I will add one more idea:  Allow the user to control the number of decimal places showed on a per dimension basis.  Currently it is global per project.    So say I'm working in inches and I need to spec one dimension to 0.0001  Currently I would have to enable four decimal places for the entire project.  This makes my work look silly to have a plastic handle speed to be 4.5000 inches long and it would look even dumber to be forced into writing "4.5000 -0.1, +0.1"

Basically my request is to enable use normal industry conventions for tolerances

[PinRudolf]

Hi Chris,

That is a great idea! Where I live we work with the ISO-standard which subscribes the +- 0.1 tolerance system, however, I believe the American standard links the number of decimal places to the tolerance? 

Thanks for the great addition!

[albertson.chris]

I don't think it is an American system it is just the common system used in
science applied to drawings. Say you were a chemist and you added 123.7
grams of "A" and 23.4 grams or "B" You would never report the results with
more then one digit. People reading your paper use the number of decimal
places as tolerance.

There are of course exceptions. For example I might measure using a steel
rule and then write down "2.125 inches" and everyone knows I am not
measuring to 1/1000th inch with a roller. But ".125" just means 1/8th
inch. But in the word decimal-inch language I might write 1.125 but
NEVER 1.500 unless I real meant that I measured to the nearest 0.001 inch.
So many exceptions.

In any case, Fusion 360 needs to track tolerances. How, I leave to
designers

[Anonymous]

I'd like to add another column in that what you have shown. That should be a column for holes, shafts and slots would be a pull down containing H7, or h6 type of tolerances. Depending on whether its a hole or a slot or a shaft or a sliding key.