Spur Gear Tool

[Alan Boughey]

In Machine Design using the 3D spur gear tool the user has the option of displaying detailed or simplified representations of the gear. If the model is drawn using the detailed model in 3D the 2D representation on the sheet layer must be shown in the same level of detail as the model. The problem with this approach is that you cannot show say the 3 normal orthographic projects in simplified form with an isometric in detail (see figure above). Is there any way that the level of detail can be set for each individual viewport?

Still with this tool, the simplified representation option only shows the OD of the gear and ID of the hub with the ID shown in hidden detail. There are no pitch lines or hidden detail of the tooth root that one would normally expect in a simplified 2D representation. This is probably due to the tool trying to show a simplified 3D representation. Is there any way to show the 3D item in a 2D simplified representation?

[GWS]

I don't believe that you can change the level of detail in a viewport for a 3D object. That is set on the design layer. (Viewports are a way of viewing you design in different ways, i.e. rendering modes and angle of view with annotations such as dimensions).

You can, however, 'overlay' a 2D gear in a viewport in annotation mode.

I agree that the simplified version is rather too simple and I have taken to drawing an arc (again in the annotation mode) to represent the P.C.D. or just using the 3D version of the gear although this does give a rather cluttered view from the side.

[AndiACD]

There's plenty of things this tool needs. i'd also like to see, along with the "Pressure Angle" and "Tooth Profile" drop down menus, a "Pitch" drop down. 32Pitch, 64Pitch, etc. etc. Everything is calculated for Mod1, but i'd like to see all pitch variations catered for.

Or have i missed something . . . . . ?

[GWS]

You can change the Mod by changing Number of Teeth and the Pitch Diameter, i.e. 40 teeth and 80 Pitch Diameter gives Mod0.5, but I agree it would be good to be able to input a Mod or DP and and say No. of Teeth and have the PD calculated.

[AndiACD]

i'd just like to be able to select a specific pitch, say 32 without having to calculate the diameter that corresponds and as VW only caters for Module, translation is a pain to say the least. Module uses decimal fractions and are easy but legacy pitches still use Olde Worlde measurements like imperial . . . . etc.

[GWS]

Agreed

[AndiACD]

So, still no input from the "Powers That Be" . . . . . . .?

Please?