Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 26, 2016 06:37AM |
Registered: 9 years ago Posts: 1,035 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 26, 2016 09:55PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 26, 2016 10:28PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 27, 2016 08:24AM |
Registered: 9 years ago Posts: 346 |
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Don't design parts that do multiple functions because if something breaks you'll have to re-print the whole part;
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 27, 2016 10:57AM |
Registered: 11 years ago Posts: 5,780 |
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realthor
I printed most of the parts that I have designed and really tried to put everything together but I had at first errors in the way I designed the parts, then I re-did them and noticed errors in me measuring the damn thing , then the way I reversed the metal frame and bolted it back to the board wasn't very exact so that some of my measurements got off and now my linear rods for Z aren't perfectly vertical...etc
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realthor
- Until 3D printing will be more exact or easier to order parts (3DHubs/etc), use the rep-strap philosophy as much as possible (off-the-shelf parts)
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 27, 2016 11:47AM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 27, 2016 09:09PM |
Registered: 9 years ago Posts: 346 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions February 27, 2016 09:21PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 01, 2016 12:36PM |
Registered: 9 years ago Posts: 1,035 |
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the_digital_dentist
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realthor
I printed most of the parts that I have designed and really tried to put everything together but I had at first errors in the way I designed the parts, then I re-did them and noticed errors in me measuring the damn thing , then the way I reversed the metal frame and bolted it back to the board wasn't very exact so that some of my measurements got off and now my linear rods for Z aren't perfectly vertical...etc
Interesting logic- it didn't work, so you thought it would be a good idea to upload the designs to Thingiverse?
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realthor
- Until 3D printing will be more exact or easier to order parts (3DHubs/etc), use the rep-strap philosophy as much as possible (off-the-shelf parts)
How will 3D printing become more exact if you post designs for printed parts that don't work?
This sort of thing is why I ignore designs on Thingiverse that are unaccompanied by photos of the parts. If there's a photo, at the very least you know the part is printable (many obviously are not), and sometimes the photos show the object in operation so you know it is workable. How many noobs waste time and materials attempting to print/printing designs that can't/don't work?
I know your intentions are good, sharing your designs, but I think it would be better to only share the stuff that works on Thingiverse. You can post everything here, working and not working - this is a good place to show off stuff that doesn't work because you can post a lot of pictures and explain what went wrong. I think that Thingiverse is more of a final repository for designs that work because the audience includes many more inexperienced builders/printers.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 05, 2016 02:00PM |
Registered: 9 years ago Posts: 1,035 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 08, 2016 03:39PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 10, 2016 04:44PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 14, 2016 09:19PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 17, 2016 07:56PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions March 24, 2016 01:58PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 19, 2016 04:49PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 19, 2016 07:51PM |
Registered: 8 years ago Posts: 776 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 19, 2016 08:12PM |
Registered: 8 years ago Posts: 776 |
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dc42
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LarsK
...
Finally - Ramps + Arduino just works... It is one less unknown for your build because you can be 99% sure that whatever problem you encounter, someone else will have experienced it before...
I think it is more accurate to say that a good quality Ramps + Arduino + LCD (needed for the SD card) just works, provided you don't attach a graphical LCD or a servo (either of which will overheat the voltage regulator on the Arduino), and once you have mastered the art of setting the stepper driver pots using a voltmeter without damaging them in the process. There are posts on these forums every week from users who have overheated the Arduino 5V regulator, and from users who are having difficulty getting the motor currents right.
IMO there are fewer unknowns with a Duet, and probably by now with as SBASE too.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 20, 2016 03:19AM |
Registered: 9 years ago Posts: 1,035 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 20, 2016 10:51AM |
Registered: 8 years ago Posts: 776 |
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realthor
@lkcl: Regarding the angles, I am using a "scout-tower"-like node configuration so I corner brackets will be difficult to adapt. They are basically intended for extrusions that connect head-on-head at the nodes. I am using this style of node:
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, which makes each member a "bracket" for the next. It is stable enough I hear. I am thinking of diagonal braces better than the brackets, maybe even cable-based,
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Regarding the Duet, you are right and I completely agree. It's just that this printer is very experimental and I need something cheap to do the testing/etc. If it proves to be ok then I will upgrade it or build another one and give it to the maker space in the area where I will be for the next couple of months.
Thanks for chiming in.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 20, 2016 10:56AM |
Registered: 8 years ago Posts: 776 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 20, 2016 03:06PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 21, 2016 07:46AM |
Registered: 8 years ago Posts: 776 |
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realthor
Mann, this thread has been quite "dead" in interaction apart from my insisting updates for something that nobody seemed to be interested in any more hehe...it's good to see someone reviving the spirits a bit.
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I am interested in ways to make the top plane stronger. However, the Quadrap doesn't seem to need much strengthening.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 21, 2016 08:46AM |
Registered: 9 years ago Posts: 1,035 |
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lkcl
mmm... 6 bolts won't help, they're too close together to make any difference (if you're thinking they might stop rotation for example), they might in fact just weaken the metal, instead you would be better off with a larger-diameter set of 3 bolts.
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lkcl
the only thing about square bar - which is great because you can get it from a hardware store - is that you'd end up bending it - i can guarantee that. to stop that you could put some (perfectly-measured!) tubular inset inside [1]. make the ID just enough to fit the chosen bolts, and they will stop the bar from crushing. if you don't tighten them up enough to crush the bars, the bars will be loose. if you tighten them enough to make them not move, they'll crush for absolute certain.
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lkcl
one other thing: take care with how accurately you drill those holes, they'd be better off slightly close.
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lkcl
also.... thinking about it....you're going to get a slight amount of twisting. you want to make absolutely absolutely sure that the alignment of the bars is such that the left side twist cancels out against the right-side twist, likewise up-twist against down-twist. so for the left side for example the blue bar should be on the LEFT, and for the right side the blue bar should be on the RIGHT.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 22, 2016 09:20AM |
Registered: 8 years ago Posts: 776 |
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realthor
If one wants to stop crushing the tube while fastening the bolt any assortment of nuts and washers that you can get inside to fill the whole gap can be attempted. I just don't think one will ever get to the "perfect" inside wall-to-wall distance. But consider this: first you don't tighten the bolts too much, just enough to assemble the frame and make it square. Then you will have 3 tubes laying against each other so they will prevent much crushing if you tighten all the bolts at the same time, gradually increasing the force. All those walls in a close area will provide enough resistance to prevent crushing. Moreover, with two bolts per tube-to-tube connection, being near the walls, the force needed for crushing would be quite high.
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lkcl
also.... thinking about it....you're going to get a slight amount of twisting. you want to make absolutely absolutely sure that the alignment of the bars is such that the left side twist cancels out against the right-side twist, likewise up-twist against down-twist. so for the left side for example the blue bar should be on the LEFT, and for the right side the blue bar should be on the RIGHT.
I don't quite get this but the arrangement in the design is about the only one that I find acceptable for the configuration I have created.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 22, 2016 03:37PM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 22, 2016 09:34PM |
Registered: 11 years ago Posts: 1,049 |
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 23, 2016 06:10AM |
Registered: 8 years ago Posts: 776 |
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realthor
Yes, you start to make some sense now ... joking, I understand a bit more from this second explanation.
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I got it now what you meant by a solid bar of the right diameter inside the square tube, preferably having the bolts go through it so that the whole thing is like a solid piece in that section. But I wonder if I can get anywhere the exact dimensions of a solid bar (square preferably) so that it fits inside the tube.
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My initial idea was to use hex couplers cut to the exact inside height of the tube so that I screw the bolt right through it. I think I should come back to that idea which I think would be easier.
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"there really is a good reason for using that aluminium extrusion: it's designed to be strong even when you try to crush it." <- I agree. However, I will insist for some more time on alu square tubing and try to apply some hacks to make it work, like the hex coupler/solid bar one.
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The 12 tubes arrangement issue is not that clear I'm afraid. I need to understand your pov before I "believe" .
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Is your observation in line with the sketch below? Is the columns arrangement below (view from top) what you meant?
[attachment 76923 screenshot.569.png]
Regards.
Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 23, 2016 09:01AM |
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Re: Coffeetable CoreXY:: new build :: small apartment rep-strap solutions April 23, 2016 09:54AM |
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