Search found 40 matches

by Vice Chief
Tue Nov 14, 2017 3:27 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

I have an accelerometer setup which can collect vibration data. I'd like to pursue this further. I could use help with the analysis side. I'm specifically looking for someone with some programming skill in Python, or some experience in signal analysis with Matlab. Anyone interested in working with m...
by Vice Chief
Mon Nov 13, 2017 4:39 pm
Forum: User's Gallery
Topic: Warp Core/Game Room deco
Replies: 7
Views: 127

Re: Warp Core/Game Room deco

I love seeing the large-scale projects on this forum. Thanks for sharing.
by Vice Chief
Mon Nov 13, 2017 12:16 am
Forum: General
Topic: Forum error pictures linked in incorrect order in post
Replies: 6
Views: 80

Re: Forum error pictures linked in incorrect order in post

PHPBB does this wacky thing where the attachment has an "ID" that changes as you upload additional content. It starts at index 1. Try attaching even the same image several times to a post, and inserting them inline, you can watch it happen. If you go back and edit your post, you'll see tha...
by Vice Chief
Sun Nov 12, 2017 9:20 pm
Forum: Printing Settings
Topic: ABS - partial insufficient strength of printed objects
Replies: 10
Views: 187

Re: ABS - partial insufficient strength of printed objects

Hey tinkerer, I don't think this is normal at all. My machines print ABS very nicely. Looking closely at your picture, I see a number of odd defects that don't look like they were part of the original model. I marked them in red in the attached image. Did you design the model? To me, it looks like t...
by Vice Chief
Sat Nov 11, 2017 7:57 pm
Forum: User's Gallery
Topic: Carbon Fiber ABS Benchy w/ acetone vapor treatment
Replies: 4
Views: 117

Re: Carbon Fiber ABS Benchy w/ acetone vapor treatment

Wow. Which nozzle are you using?
by Vice Chief
Sat Nov 11, 2017 2:35 am
Forum: Hardware
Topic: Carbon Fiber Print surface??
Replies: 13
Views: 185

Re: Carbon Fiber Print surface??

I had them custom made at a friend's optical fab shop. My .01mm flatness spec was pretty easy for them. :). I also quoted them out, if we can get 10 interested buyers, we can get them for $95.00/ea with a 3 week lead time. I also had to fabricate new clips for the back of the bed. If there was inter...
by Vice Chief
Fri Nov 10, 2017 5:42 pm
Forum: Hardware
Topic: Carbon Fiber Print surface??
Replies: 13
Views: 185

Re: Carbon Fiber Print surface??

I'm using 6mm borosilicate glass plates that have been ground flat. They are excellent, but they increase the heat-up time by a few minutes.

Other people like PEI sheets. I have a sheet of it around, but haven't tried it yet.
by Vice Chief
Wed Nov 08, 2017 9:04 pm
Forum: General
Topic: Bond Tech Extruders . Any good, whats the improvement?
Replies: 16
Views: 397

Re: Bond Tech Extruders . Any good, whats the improvement?

Jetguy, can you point me to the info about what happens if it comes unplugged? I glued mine in place with some hot-melt, but I'd like to learn.
by Vice Chief
Sun Nov 05, 2017 9:49 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

The gcode doesn't say anything about acceleration that I can see, so I assume it is stored in firmware.
by Vice Chief
Sun Nov 05, 2017 1:16 am
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

Reduce mass and/or acceleration/deceleration and ringing should decrease proportionally. Right! You can see that in this gif http://forum.raise3d.com/download/file.php?id=5422&mode=view - removing one stepper motor reduces the amplitude and increases the frequency of the ringing. Still a long w...
by Vice Chief
Sun Nov 05, 2017 1:14 am
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

Regarding the "rippled" extrusion of apparently varying width when viewed from overhead, might this not be a consequence of the toothed wheel and stepping motor feed system? Or does that stuff get "averaged out" by the fluid melt inside the nozzle? If this were the case, wouldn'...
by Vice Chief
Sat Nov 04, 2017 9:05 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

Here's some 1000FPS footage of ringing as it happens.
https://www.youtube.com/watch?v=Gqbj1IrtdpM

Here's a plot of ringing extracted by tracking features of the video.
RingingPlotCrop.jpg
by Vice Chief
Sat Nov 04, 2017 5:39 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

I'm starting to think I have a pretty good idea of what's happening here. Here are some images that tell a story. In the images of this print, the motion goes from left-to-right. These were all shot with my photomicrography rig. 1. I printed my test cube, but stopped the print halfway. That way, I c...
by Vice Chief
Sat Nov 04, 2017 4:01 am
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

Yes, that article sounded great but when you read it there is nothing specific, "just we can do this trust us". What I found fascinating was that it was done based on first principles (theory) rather than on measurement. I am a big fan of measuring things! Press releases usually suck. I f...
by Vice Chief
Sat Nov 04, 2017 12:39 am
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

OK, well this turned out to be fairly interesting. Conditions: 1 year old N2. ABS plastic. .15mm layer height. I printed my test object twice. The first print was with a single stepper on the extruder carriage assembly. The second was with both steppers in place. Ringing4.jpg To make these images, I...
by Vice Chief
Fri Nov 03, 2017 9:51 pm
Forum: User's Gallery
Topic: Patterns for Aluminium Sand Casting
Replies: 38
Views: 4111

Re: Patterns for Aluminium Sand Casting

Caxton3D, I agree wholeheartedly. I think the Raise3D printers offer great value. In one of my jobs, I bought a Fortus 450, and also several Raise printers. The Raise machines were close enough in quality for 95% of our prints, and around 1/30th the price. Plus, since they weren't "precious&quo...
by Vice Chief
Fri Nov 03, 2017 9:39 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

so I think that the biggest ringing problems we are actually capable of seeing are in the 0.5-2mm range, what frequency range would that be? It looks like 30-120 Hz BUT you don't get many ringing problems when going flat out at a constant speed, they are mainly on decelerations! Maybe I'm a little ...
by Vice Chief
Fri Nov 03, 2017 8:38 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

Although it's not really instrumentation grade, I may pick up one of these: https://www.phidgets.com/?tier=3&catid= ... &prodid=31 to get started.
by Vice Chief
Fri Nov 03, 2017 4:20 pm
Forum: Others
Topic: RINGING the electromechanical challenge
Replies: 26
Views: 395

Re: RINGING the electromechanical challenge

Another thought I had, I have removed the second extruder from both of my machines, but it's not difficult to bolt the second stepper back on. I could print one print with both steppers in place, and one with just one stepper in place. Since the whole system gets lighter, one would expect that the f...

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