Register | Help | Store Account | FliteTest Dashboard
Page 139 of 139 FirstFirst ... 39 89 129 137 138 139
Results 1,381 to 1,382 of 1382
  1. #1381
    Posted a thousand or more times jhitesma's Avatar
    Join Date
    Mar 2012
    Location
    Yuma, AZ
    Posts
    4,457
    acp - glad you like it!

    That little rack WAS pretty easy, the CAD was the hardest part. I started working on a 3 shelf version with more interlocking tabs last night (Onshape document link: https://cad.onshape.com/documents/ab...69253128418fc6 ):

    Click image for larger version. 

Name:	Screen Shot 2017-07-25 at 8.27.03 AM.png 
Views:	0 
Size:	88.5 KB 
ID:	91619

    Click image for larger version. 

Name:	Screen Shot 2017-07-25 at 8.26.55 AM.png 
Views:	1 
Size:	80.3 KB 
ID:	91620

    Still a work in progress...not nearly as easy! The foam cutting will be...but the CAD is proving surprisingly difficult....but just after I gave up and went to bed I had a small epiphany - The original version I was able to just take my original sketches that were used to extrude the parts and export them as the DXF's for cutting. This time I tried to get a bit fancier and expanded those sketches to include extra material I'll use for wrapping around the exposed edges:

    Click image for larger version. 

Name:	Screen Shot 2017-07-25 at 8.30.03 AM.png 
Views:	0 
Size:	44.0 KB 
ID:	91622

    See the extra 8mm section off the bottom? Seemed quick and easy. And wasn't that big of a deal, when I did the extrusion I just unselected that portion of the sketch to eliminate it from the extruded part:

    Click image for larger version. 

Name:	Screen Shot 2017-07-25 at 8.30.45 AM.png 
Views:	0 
Size:	32.9 KB 
ID:	91623

    No big deal. But...then I started modeling the tabs. And things got tricky. Because the parts reference off each other. I modeled the lower shelf first, then translated it creating a copy for the middle shelf, then drew the 3rd shelf on a place referenced off the middle shelf. So far so good. Then I drew the side using a side face of one of the shelfs - again straight forward. And the back and base were also fairly easy.

    But...then I realized I need that little "inner support" to support the lower shelf. And while I could have just made it a rectangle and had it rely on glue. But my big plan here was to push myself and make the whole thing tabbed. But...going back and modifying the original sketches for the lower shelf and base and side to add tabs/slots that interlock got tricky. I can't just use/project from the new inner support to place the slots because the sketch for those other parts exist in the timeline before the inner support exists. And I can't move the inner support earlier in the timeline because it's referenced off those other parts. I'm stuck in a reference loop! Arrrgh!

    Just before I called it a night I realized I could use booleans on the parts so I drew the inner support with tabs/slots where I wanted it and then used a boolean operation to cut a slot into the side. Cool. Except...that doesn't modify the sketch for the side. If I was 3D printing this no big deal because the part is what I need. But I'm looking to needle cut it so the sketch is what I need to generate a DXF from. Hmmm. I played with creating drawings off the parts and those can export as DXF:

    Click image for larger version. 

Name:	Screen Shot 2017-07-25 at 8.38.37 AM.png 
Views:	0 
Size:	23.8 KB 
ID:	91624

    But when I import them into inkscape they're all messed up So those aren't really usable for cutting from.

    So at that point I decided to call it a night out of frustration.

    And then just as my head hit the pillow it hit me....it's not the cleanest solution and I'm guessing there a more "correct" solution out there I just can't figure out (probably related to the drawings) but...all I need to do is create a second sketch for the side. Instead of re-using the sketch I used to create the side I just create a sketch on the face of the final part, then use/project it's outlines...boom - I've got a sketch I can export as DXF and import into estlcam or inkscape!

    So I still have a bit of CAD to do to finish the last few slots/tabs...but cutting should still be pretty quick (I'm guessing around 9 minutes with the extra parts) and the final project should be even better. But...man...this is a great example of a quick easy project ballooning into a much trickier projects without appear to actually gain much complexity!
    Stop in and say hi in the unofficial FT IRC channel!

  2. #1382
    Posted a thousand or more times jhitesma's Avatar
    Join Date
    Mar 2012
    Location
    Yuma, AZ
    Posts
    4,457
    Andre - So hyped to hear we've caught your interest I figured moebeast being at FF two years in a row with his cutter would attract some attention but had been kind of surprised there didn't seem to be much of an uptick in interest...maybe I'm just impatient

    I have my latest design almost ready to go live on Thingiverse...just need to add some more details to the description and want to work up a version with the standard 525 mount before I release it since new machines are using that design which IMHO is somewhat better than hicwic at this point.

    Once that's done I'm hoping to write up an FT article to draw more attention to all of this...and try to consolidate our nearly 140 pages of discussion and development into one concise "what you need to know to replicate this" article. Partly just so there is a good reference like that...but also because FT seems to pay more attention to articles than forum posts

    Ryan who created the MPCNC seems to be getting more interested in the needle cutter as well. He even added a section to his gallery page just for needle cut projects:
    https://www.vicious1.com/videos/gallery/

    (it's a ways down the page under PCB and above 3D Printing)

    In this thread: https://www.vicious1.com/forum/topic...machine-ideas/ Ryan commented:

    At my last job we spent months cutting a fairly complex shape out of similar foams. We tried everything and tons of different foams. I am interested to hear anything that comes out of this. We ended up using a template to mark it then scissors and the manufacturer ended up die cutting them as far as I know. The partial cut is going to be the toughest to get consistant I think.
    I then suggested the needle cutter - and picked up a piece of foam like they were working with to test and confirmed the needle cutter works perfect on it. Not sure how well it would do at 3/4" thick - but at least with 5-6mm thick pieces I tested on it cuts even better than DTFB since the foam is softer and there's no paper to deal with. I'm curious to see if they end up trying it as I think it could be just the ticket for what they're trying to do.

    Honestly having built an official FT laser cut kit and quite a few needle cut planes I prefer the needle cut foam since it doesn't have the undercutting the laser results in. I don't think the needle would be very practical for mass production - but...I don't know how long FT's lasers take per-sheet so it's hard to say. With the latest cutter improvements and speed increases maybe it's not far off. For home use the needle definitely seems superior to me though. And you can always strap a low power laser on for etching and cutting firewalls and such. I still kind of want to rig up a way to mount the laser and the cutter at the same time - account for the offset in software and be able to cut with the needle but switch over to the laser to do markings without having to swap tool heads. Then again maybe I just need to bite the bullet and learn to do tool changes and workpiece alignment so I can use the laser to decorate both sides of the foam...hmmm...

    I meant to finish the thingiverse posting last night...but got sucked into working on the ink rack which took far longer than I expected. Hopefully tonight I can finish the thingiverse post and start on an article....
    Stop in and say hi in the unofficial FT IRC channel!

Page 139 of 139 FirstFirst ... 39 89 129 137 138 139

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •