My 350x350mm CoreXY design January 01, 2016 05:40PM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design January 02, 2016 08:43AM |
Registered: 9 years ago Posts: 346 |
Re: My 350x350mm CoreXY design January 02, 2016 10:01AM |
Registered: 8 years ago Posts: 67 |
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LarsK
Hey,
1) It is OK with just tensioning the belts by hand and locking them.
2) You can just google the dimensions of a e3d hotend. Or download one model on thingiverse or grabcad.
About fans; If you plan to use a heated bed and print in ABS then you cannot (not optional) blow air on the extruded plastic - As such, you will only need to cool the heatsink on the hotend (the ribs) and do that with a ducting so no air is diverted onto the print. If you want to print PLA then you can optionally install a fan to blow on the extruded plastic (it will allow you to print faster and better).
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LarsK
3) The steppers you have on hand will work fine - Actually they are pretty overpowered. You will not be powering them with more than 1A anyways - Even less then that should be enough for your purpose. I also use Minbea for my z axis - If you have not yet sorted out the connection this photo may help.The one you have (23LM-C710-04) is in the big class . They are maybe stronger then your alternative but you can measure the phase resistance with an ohm-meter to confirm that.
I am no expert on steppers, actually my electronic skills are pretty poor, but you should be aware of the following potential problems with you choice of motors:
a) They are big - Nema 23 is more difficult to implement than Nema 17 - And yours are almost the biggest you can get in the 23 series.
b) There are some stepper voodoo which may give you a headache. Mainly for the extruder. If you don't use the normal Nema17 long on the extruder you may get strange problems with retraction problems and motor grinding filament.
Re: My 350x350mm CoreXY design January 02, 2016 12:06PM |
Registered: 9 years ago Posts: 346 |
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Dalius98
But I can understand your concerns about using them in extruder - a powerful motor is unlikely to skip steps when obstruction occurs, and will grind the filament. Can I just run it under a lower current, or will that have other negative aspects? And what retraction problems are we talking about?
Re: My 350x350mm CoreXY design January 02, 2016 01:28PM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design January 02, 2016 02:55PM |
Registered: 8 years ago Posts: 346 |
Re: My 350x350mm CoreXY design January 02, 2016 03:59PM |
Registered: 8 years ago Posts: 67 |
I do intend to print ABS. Enclosing this will be pretty easy, I have something in mind. But the differential thermal expansion... well, I'll just have to try it and see how it works. Will let you knowQuote
the_digital_dentist
Are you intending to print ABS? If so you might want to start thinking about how you're going to enclose the machine to keep the build chamber warm. On the same subject, have you considered what happens to all those structures when the temperature rises? The aluminum will expand more than the steel guide rails. That will create bending forces that may cause the guide mechanisms to bind.
I've been working on a similar CoreXY design and trying to figure out how to deal with the differential thermal expansion. I'm starting to think that the rectangular frame that holds the linear guides should be made of steel. A steel frame for at least that part of the printer would eliminate the problems created by thermal expansion. That steel frame can then be mounted in an easy to build aluminum frame, with the mount designed to allow the aluminum frame to expand more than the steel without creating any stresses on either.
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filipeCampos
Looks like an great design, looking forward to see the evolution of this printer...
You are planning to use heavy hardware, this will be expensive.
About motor use nema 17, 1.5 or 1.7A and 1.8 degre.
The fan to cold down the pla is an must in my opinion, without the fans there are prints that are not possible to print with good quality.
If you want to print only abs them forget the fans, if you will print both them you must have an fan. Printing abs you tell the slider do disable the fan.
Re: My 350x350mm CoreXY design January 02, 2016 07:42PM |
Registered: 9 years ago Posts: 346 |
Re: My 350x350mm CoreXY design January 02, 2016 08:17PM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design January 08, 2016 07:13PM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design January 16, 2016 12:34PM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design January 16, 2016 10:18PM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design January 19, 2016 05:28PM |
Registered: 8 years ago Posts: 67 |
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the_digital_dentist
Many of the wires in my machine are >2m long. No problems at all if you use adequate gauge wire. I think I used 20 ga wire for the motors, heavier stuff for the extruder heater, and much heavier stuff for the bed heater. Thermistor and end stop wires don't have to be anything special. I did twist the motor wires (one twisted pair per coil) and heater wires using an electric drill and a vise. Twisting helps prevent inducing currents in wires that are in close proximity to higher current wires.
Re: My 350x350mm CoreXY design January 29, 2016 01:39PM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design January 30, 2016 01:44PM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design January 30, 2016 02:11PM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design January 30, 2016 03:12PM |
Registered: 8 years ago Posts: 67 |
I'm not sure, to be honest. Didn't have time to really dig in to the config, I'm not even sure if microstepping is something I can adjust on Smoothieboard.Quote
the_digital_dentist
Wow! I thought my printer was noisy! Was microstepping turned on?
It looks like a good, solid build. I'm sure it will produce quality prints when you're done.
Re: My 350x350mm CoreXY design January 30, 2016 08:03PM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design February 19, 2016 07:27AM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design February 19, 2016 11:06AM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design February 19, 2016 12:22PM |
Registered: 8 years ago Posts: 67 |
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the_digital_dentist
I would probably space the two Y axis linear guides (and Z axis rails or guide) by putting a spacer (wood or metal rod cut to exact size) between them.
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the_digital_dentist
When I set up my printer, I did the initial setup using one of these:
[www.ebay.com]
You place this device against the guide rails/linear guides, not the frame pieces they are bolted to.
Then I printed a part and measured diagonals to check squareness and made adjustments as required.
[www.youmagine.com]
Re: My 350x350mm CoreXY design February 19, 2016 02:30PM |
Registered: 11 years ago Posts: 1,049 |
Quote
the_digital_dentist
Are you intending to print ABS? If so you might want to start thinking about how you're going to enclose the machine to keep the build chamber warm. On the same subject, have you considered what happens to all those structures when the temperature rises? The aluminum will expand more than the steel guide rails. That will create bending forces that may cause the guide mechanisms to bind.
I've been working on a similar CoreXY design and trying to figure out how to deal with the differential thermal expansion. I'm starting to think that the rectangular frame that holds the linear guides should be made of steel. A steel frame for at least that part of the printer would eliminate the problems created by thermal expansion. That steel frame can then be mounted in an easy to build aluminum frame, with the mount designed to allow the aluminum frame to expand more than the steel without creating any stresses on either.
Re: My 350x350mm CoreXY design February 19, 2016 11:35PM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design November 01, 2016 08:14PM |
Registered: 8 years ago Posts: 67 |
Re: My 350x350mm CoreXY design November 02, 2016 08:26AM |
Registered: 11 years ago Posts: 5,780 |
Re: My 350x350mm CoreXY design November 02, 2016 01:45PM |
Registered: 8 years ago Posts: 67 |