Please help me to pick the right electronics package. December 15, 2017 12:59AM |
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Re: Please help me to pick the right electronics package. December 15, 2017 02:18AM |
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Re: Please help me to pick the right electronics package. December 15, 2017 03:28AM |
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Re: Please help me to pick the right electronics package. December 15, 2017 05:16AM |
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dc42
So you want 7 or 8 independently-driven motors. One option for you is Duet WiFi or Duet Ethernet, plus DueX5 expansion board. That combination provides 10 stepper drivers with the possibility of 2 more external drivers.
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dc42
With 10 drivers you could handle a 5-input Diamond hot end.
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dc42
Instead of using 2 separate Z endstop switches, you can use a Z probe to measure how far out of level the bed is and adjust the two motors independently. If 3 Z motors are used, you can level the bed in both directions this way.
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dc42
If you are looking for dual extrusion, I suggest you look at IDEX architectures - two independent X carriages. This avoids the problem of the non-printing nozzle interfering with the print. It needs an extra motor to handle the second X carriage.
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dc42
Have you considered using a CoreXY architecture?
Re: Please help me to pick the right electronics package. December 15, 2017 05:22AM |
Registered: 8 years ago Posts: 622 |
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Don McLean
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Dual motors driving the Y axis, I also want to have two limit switches on one side for a homing sequence on startup to make sure the gantry is always square. I want two motors because I prefer to keep the design simple, I'd like to use Nema 17's all around, and because my gantry will weigh a bit more than the average 3D printer, so the extra torque is good. I realize there are other design options out there, but right now I'd like to pursue this one.
Re: Please help me to pick the right electronics package. December 15, 2017 08:24AM |
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Re: Please help me to pick the right electronics package. December 15, 2017 09:54AM |
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Don McLean
LOL. I can buy an arduino Mega and ramps 1.4 for $40 Canadian shipped from EBay. Of course, I don't think that can do what I need.
It's a really great suggestion, and I appreciate it, but are there any less expensive options? I can't blow this much of my budget on just the control boards.
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Don McLean
My main reason why I want two print heads is that I want to print dissolvable support material. I want to make some high quality prints with complicated shapes for a specific application. I figured if I went for two, why not three, but really, I only need the 2.
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Don McLean
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dc42
Instead of using 2 separate Z endstop switches, you can use a Z probe to measure how far out of level the bed is and adjust the two motors independently. If 3 Z motors are used, you can level the bed in both directions this way.
OK, that's good to know. So the Z proximity sensor can do this. This is configured in the control software? For example, if using Duet, this is where you would set this up?
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Don McLean
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dc42
If you are looking for dual extrusion, I suggest you look at IDEX architectures - two independent X carriages. This avoids the problem of the non-printing nozzle interfering with the print. It needs an extra motor to handle the second X carriage.
This is interesting advice. Thank You. Funny enough, I was just looking at the bnc3d machines on Youtube before I read this. I assume they have a homing switch on each side of the gantry for each print head on initial power up? Also looks like they have a build in calibration program. After I read your comment I had another look, and did find a DIY vid on YouTube of this very thing, so it is possible, what kind of hardware software support is required to do the calibration? I'm seriously considering this now.
Re: Please help me to pick the right electronics package. December 15, 2017 11:20AM |
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Re: Please help me to pick the right electronics package. December 15, 2017 05:52PM |
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Re: Please help me to pick the right electronics package. December 15, 2017 11:22PM |
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Re: Please help me to pick the right electronics package. December 16, 2017 01:51AM |
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Re: Please help me to pick the right electronics package. December 16, 2017 07:08AM |
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LOL. I can buy an arduino Mega and ramps 1.4 for $40 Canadian shipped from EBay. Of course, I don't think that can do what I need.
Re: Please help me to pick the right electronics package. December 16, 2017 09:48AM |
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Re: Please help me to pick the right electronics package. December 19, 2017 02:27AM |
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Re: Please help me to pick the right electronics package. December 19, 2017 03:15AM |
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Re: Please help me to pick the right electronics package. December 19, 2017 08:53AM |
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Don McLean
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Also I've been looking more closely at the H-bot and Core XY designs. Mechanically it wouldn't be a problem to add a second belt driven head to this design but given the nature of the H-bot and Core XY architectures, could the software handle an extra independently driven head in combination with either of these designs?
Re: Please help me to pick the right electronics package. December 21, 2017 09:41PM |
Registered: 6 years ago Posts: 28 |
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ampapa
Not that my opinion matters
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Trakyan
As for the dual independent print heads taking up a lot of space, they shouldn't take up much more space than any other dual extruder set up. As you start looking at larger and larger printers, the extra 50-100mm you'll need on the X axis gets less and less significant compared to the build volume.
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Trakyan
Any reason you need a combined idler pulley?
Re: Please help me to pick the right electronics package. December 22, 2017 03:05AM |
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Re: Please help me to pick the right electronics package. December 22, 2017 06:22AM |
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Re: Please help me to pick the right electronics package. December 22, 2017 12:43PM |
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Don McLean
dc42, really impressive machine you made, also I'm very impressed by the dual level homing from the duet.
Re: Please help me to pick the right electronics package. December 22, 2017 02:03PM |
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Re: Please help me to pick the right electronics package. December 23, 2017 11:06AM |
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Re: Please help me to pick the right electronics package. December 23, 2017 11:17AM |
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Re: Please help me to pick the right electronics package. December 23, 2017 08:04PM |
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Re: Please help me to pick the right electronics package. December 24, 2017 08:18AM |
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Don McLean
Trakyan, idlers typically have a bearing in them, or bushing, or something to help them spin. So no, I could just bolt them in place, perhaps with the help of a few spacers. At least that is my understanding. They are not the same thing.
Re: Please help me to pick the right electronics package. December 24, 2017 09:56AM |
Registered: 8 years ago Posts: 622 |
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Don McLean
Does anyone know if I can add a single servo control to any of the previously mentioned options? I'm not talking about a servo motor to spin a belt, I'm talking about a single servo the kind you might find in a radio controlled airplane, normally used to move a rudder or elevator or aileron on a RC plane?
Re: Please help me to pick the right electronics package. December 24, 2017 12:25PM |
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Re: Please help me to pick the right electronics package. December 24, 2017 12:59PM |
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Re: Please help me to pick the right electronics package. December 24, 2017 02:35PM |
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Re: Please help me to pick the right electronics package. December 25, 2017 12:07PM |
Registered: 6 years ago Posts: 28 |
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Trakyan
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Don McLean
Trakyan, idlers typically have a bearing in them, or bushing, or something to help them spin. So no, I could just bolt them in place, perhaps with the help of a few spacers. At least that is my understanding. They are not the same thing.
Sorry, my bad (wrong terminology/poor explanation). Not an idler pulley, just regular old pulley with a set screw. You'll be mounting your pulleys on some sort of shaft (I'm assuming?), so why not mount two pulleys next to each other and put the shaft on a set of bearings. Look at the way the pulleys are set up in the image below.
[maxdesign1990.files.wordpress.com]
In the bottom right, there is a pulley that drives the belt that moves the axis, and a pulley with a belt going to the motor. The two pulleys don't have to be machined from the same block of aluminium, just mounted to the same shaft to achieve the same effect. A few extra parts involved but it allows for more freedom and flexibility with pulley ratios.
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deckingman
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Don McLean
Does anyone know if I can add a single servo control to any of the previously mentioned options? I'm not talking about a servo motor to spin a belt, I'm talking about a single servo the kind you might find in a radio controlled airplane, normally used to move a rudder or elevator or aileron on a RC plane?
I don't know about other boards but you can connect servos to the Duet. You can use pins on the expansion connector or if you buy an expansion board (which also give you additional stepper drives and a host of other connectors) there are dedicated servos connectors. See here [www.duet3d.com]. There is also a gcode command to set the servo position [www.duet3d.com]
HTH