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Two new configuration options

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13 comments

  • Tim Heeney

    WRT option 2 above:

    There are ways to do the 2 examples above more directly increasing speed and efficiency.

    Curve Projection:

    To override the default behaviour: For curve projection, select command, then the faces to be projected onto, then the direction and lastly the curve - if wanting more faces projected to, select face tool again. This way no unwanted projections.

     

    Create Pattern by having to initially drag, is reported as a problem.

    However, as shown below, ( although unsure if this is universally possible) patterning may be started after the selected direction by entering the full included angle ( start > finish ) . Then subsquently modified either by properties or grahical dialogues.

     

     

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  • Me Here

    Me here:"If I want to project some lines onto a surface, and I select those lines prior to clicking on the project tool,"

    There are times when it is not just convenient, but necessary to select the lines to be projected before selecting the project tool.

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  • Me Here

    I got something running that's going to take a few hours, so, an example.

    I have this pair of surface that I wish to blend together to form a solid. From experience, I know that I will need to use some guildelines if I want the blended surfaces to be true. With 100T, four sets is enough. With this 30T 3 sets isn't, 4 & 5 don't work, so 6 sets.

    1) Now, if I invoke the blend tool with nothing selected and the double-click one of the edge loops -- which takes a split second to select outside of the blend tool -- inside the blend tool, that double-click causes DSM to disappear up its own cpu for 5 hours before eventually returning with an error message telling me that it needs 2 things to be selected before it can do a blend!

    I know that! Why does it take DSM 5 hours to remember that attempting to blend the thing I selected, before it allows me to select the second,doesn't work?

    2) if I select both edge loops outside of the blend tool, and then invoke blend, it will disappear for 5 hours before presenting me with a surface.

    Trouble is, that surface will be wrong, because I haven't yet had the opportunity to select the guildlines. And If I attempt to do it now, it will re-blend the surface (taking hours) after I Alt-click the first guideline; then again after I ctrl-alt-click the second; then again after the 3rd....

    You get the picture.

     

    The only way (I have found), is to Alt-click/Ctrl-alt-click each of the guidelines individually -- drag selecting with the Alt key doesn't work as you might reasonably expect it would.

    Then double-click the first edge loop; then Ctrl-double-click the second edge loop.

    And only then invoke the Blend tool.

    It then disappears for a (long) while before returning with the surface I want. Then I click the Finish 'tick' icon and it disappears again for even longer; but when it returns, I have the solid I want.

    But discovering that 6 sets of guidelines was required, meant many wasted hours trying 3 sets, then 4 sets then 5 sets.

    If it would waiting until I told it to do something, I could go in to the tool, select the two edge loops and 3sets of guidlines, and then say go. When it returns I could inspect the surface offered and if it wasn't enough, ctrl-alt-click another set of 4 guidelines before asking it to try again. The two days I spent discovering that 6 sets were required would be reduced to a half a dozen hours.

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  • Jacant

    Is the top gear surface directly above the bottom surface?

    Just looking at the image, they look to be offset. Is that correct?

    If they are in line, then why don't you use Freecad? It has a 'Gear Workbench'

    There is a choice between an Involute gear, an Involute rack, a Cycloide gear, a Bevel gear and a Crown gear.

    Both made in Freecad

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  • Me Here

    Here's the 30Tx1 I made, and a 30Tx1 from freecad, same size, thickness cone and beta angles

    I took one look at the mishappen teeth and gave up on FreeCAD gears.

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  • Me Here

    Of course. It is possible that mine is wrong and the freecad one is correct. But looking at real world examples (pictures), they look more like mine than freecads.

     

    Essentially, I think freecad gets the angle of the twist wrong.

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  • Jacant

    I had a look at that STL file you sent me. The only way to make it work would be to draw over the edges as shown with a Spline. Do this for the other end and Fill them. Blend using Splines taken from the top facets. I would do it this way so that you create a Cutter. Only it will not work on this particular Mesh, because the top face is horizontal. It would work if both edges where as in the second image.

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  • Me Here

    Thanks Jacant. I had similar troubles with that one also.I love that second image, so finely detailed. (I bet it uses gobs of memory; and time to process?)

    I think I will have something better -- more amenable to conversion to solid geometry -- in a few days.

    I'm still puzzled by what the slider is that DSM pops up when you select several faces in a faceted model (stl import) are?

    Update: it only happens if you double click a face?

    Any idea?

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  • Me Here

    And I just noticed that model has asymmetric teeth also!

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  • Jacant

    The second image is just a different STL file. You can select and delete any of the faces. Just use a crossing window right to left. Be careful it may select faces behind.

    As for the 'slider' I have no idea. I have not seen it on my screen. Even by double clicking.

     

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  • Jacant

    And I just noticed that model has asymmetric teeth also!

    It depends on where you view it. I was convinced that the teeth where on a slant, with one edge more vertical than the other.

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  • Me Here

    What I'm going to call the "facets slider" until I see some offical documentation on it, seems to select more adjacent faces as you slide it; with the definition of "adjacent" being different depending up whether you slide it up or down from its starting position:

    And using that to select and copy that outer surface really shows just how asymmetric the teeth are:

    But then if you tilt it at just the right angle:

    Does that mean that in addition to tilting the profile to the back cone angle, you also have to twist it?

    Doesn't look like it to me:

     

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  • Me Here

    jacant: FWIW, (not much), I managed to blend the groove shape of that tooth with the awkward ends:

    I was bored waiting for a response from an openscad guy.

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