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  1. Martinm

    Modeling parametric weld cart

    Just looked at the shelf - all dimensions are calculated from the global parameters. Would it be possible to obtain certain dimensions by assembly constraints? Like instead of calculating the width of the inner shelf panels, constrain their sides to the left and right as coincident to the side...
  2. Martinm

    Modeling parametric weld cart

    Hi all, I would like to model a weld cart like Peter showed in this thread: https://forum.zerspanungsbude.net/viewtopic.php?t=40750 I am wondering how to model this in order to be flexible. I'd want to keep most dimensions parametric, like width, height, inclination of top shelf etc. What I...
  3. Martinm

    Twisted Extrusion

    Do you want to restore it faithfully or just get it working again? You could change the second (helical) gear pair with some standard catalog one (non-helical). Will it have to stand daily heavy use?
  4. Martinm

    Twisted Extrusion

    Just looked up what a "Buffalo 200 silent" is. It is a 1910 hand-crank blower for small forges (am I correct)? Looking at the photos, there seems to be no place for a worm gear (90° angle between two axes), so I might be wrong and this is simply a helical involute gear (although one with large...
  5. Martinm

    Twisted Extrusion

    These are worm gears, where the teeth slide over another. I doubt these can be 3D printed with reasonable performance as metal laser sintering leaves a very rough surface, in contrast to the ground finish you are looking for here.
  6. Martinm

    Twisted Extrusion

    I used a pressure angle of 20° (did you mean that with "contact angle") - seems to be common. The herringbone rack has an offset of 1 tooth (pi mm) over the half width of 10 mm. So angle would be atan(pi/10)= 17.44°. - Martin
  7. Martinm

    Twisted Extrusion

    Thanks everyone for the explanations! - Martin
  8. Martinm

    Twisted Extrusion

    @Stefan: Basically I wanted the twist to be one full tooth, so first and last profile are identical. If you add just one intermediate sketch (rotated one half tooth), then the loft function can't possibly know whether to rotate left or right. I guess this could require a guide curve (?) or just...
  9. Martinm

    Twisted Extrusion

    Hmmmm... is there any reason why the full profile helical boss does not work?
  10. Martinm

    Twisted Extrusion

    @seb I have not tried a helical boss with one tooth - is there a reason why the whole gear profile would not work? @Lew_Merrick : I'd design the herringbone so it overlaps one tooth over the full with. Tooth module is 1 (pi mm pitch, 20 mm dia, 20 teeth) and width of the gear 2*10 mm. I tried it...
  11. Martinm

    Twisted Extrusion

    I'd like to make a herringbone gear like this: http://www.welter-zahnrad.de/wp-content/uploads/WELTER-Pfeilverzahnung.jpg Application is a 3D printed microscope focusing rack (like this one https://www.amazon.ca/KOPPACE-Microscope-Focusing-Accuracy-Aperture/dp/B07MDGSF76). So it need not be...
  12. Martinm

    Walnut machine

    Hi Guys, I just wanted to show you a fun project I did with Alibre recently. The job was to design a machine that spews out one walnut per day. So I designed a walnut dispensing mechanism and added a one day timer to the drive. The glass was home to some pickles before and I had to guess the...
  13. Martinm

    Architecture, Stone and ZBrush

    I exported the model as STL from Alibre and imported that into ZBrush. I had to play a bit with the STL export settings to give ZBrush reasonable triangle sizes to work with. In the meantime they brought out an improved remeshing algorithm that might handle straight edge non-organic meshes...
  14. Martinm

    Architecture, Stone and ZBrush

    It's 200 mm tall (I scaled it to fit into the printer). There were tons of support structures and it was quite a mess to clean the vaults... unfortunately I did not take pictures after printing. The monk is 18 mm and was rather difficult to print because of his tiny size.
  15. Martinm

    Architecture, Stone and ZBrush

    Hello everyone, this is a project I did some time ago. Somehow I stumbled across the gorgeous stone carvings by Matthew Simmonds: http://www.mattsimmonds.com/gallery_1.html I immediately had the idea to re-create one of those for 3D printing and chose the "Romanesque Stone"...
  16. Martinm

    CurrentPart() not working

    Well, it's a usability thing. The core proble is that I'd like to write the code iteratively, as this API is new for me and I need to see what the commands do (in addition to the completely random behavior of "direction" flags). So what I do is: write some code run it change one command run it...
  17. Martinm

    CurrentPart() not working

    Hello Stefan, OK, this works... but almost doubles the coding for the remove section. I'd vote for part.Reload()... - Martin
  18. Martinm

    CurrentPart() not working

    OK, so now I am creating a new part (a drill bit rack, just a block with many holes). How can I have the same clean start every time I run the script? If I just run it multiple times (while adding stuff to it), generated geometry adds up in the part. I tried part.Close() and then reload the...
  19. Martinm

    CurrentPart() not working

    Thanks for the info - while I'm not a Python guru, I thought one of the key points of this language would be that you can try out everything from the command prompt. "Works only in scripts" is quite un-pythonic... - Martin
  20. Martinm

    CurrentPart() not working

    What do you mean by that? What I do: Open Alibre Create new part go to Alibre Script tab press "Launch" in the console, enter p=CurrentPart() gives an error message. - Martin
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