Duet3D PCB delta printer effector sneak preview
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Based on the known dimensions, and the schematics shown, it would be between 7.8-8mm
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It's time for me to prepare wiring
so I've got a 2 wires PT100, with everything under 24v, from what I see I can use one of my 6 wire cable for Molex KK, 22AWG will do the job.
But what about the Molex Microfit, I would like to use the same cable but could I use a 22AWG for the extruder heater ? I currently have a 40w 24v cartridge, from my point of view it's OK, but I'll prefer a second advice
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It's time for me to prepare wiring
so I've got a 2 wires PT100, with everything under 24v, from what I see I can use one of my 6 wire cable for Molex KK, 22AWG will do the job.
But what about the Molex Microfit, I would like to use the same cable but could I use a 22AWG for the extruder heater ? I currently have a 40w 24v cartridge, from my point of view it's OK, but I'll prefer a second advice
1.7A current is well within ampacity of 22AWG for chassis wiring. And voltage drop of 0.2V is not much of concern for the case.
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My plan was to use fairly thin 8 core multicore cable for the signal connection (4 wire PT100 connection from the effector back to the Duet), and use the same cable for the heater/fan connector with 2 conductors in parallel for each of the heater wires. In the end I didn't change the heater and fan wires because they were already working well. I can't remember what gauge the conductors were, but the resistance per conductor was just under 0.1ohm per metre.
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@CaLviNx:
I need the distance from the centre of the hole to the short edge of the effector
x = 5.75 * sqrt(2) * cos(15) ~= 7.8546460717605222188914082318294
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I had the dimensions worked out, I just wanted Tony's confirmation.
And suddenly a lot of non Tony's jumped in !!!!
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For the cabling, I was planning on using 6 core 22awg for the heater and fan connections,
and then for the PT100 and probe connections, I have lots of stranded cat 6 that I can use. Hopefully, the probe and the PT100 won't interfere with each other? Any thoughts?
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The probe and the PT100 signals don't interfere with each other. The 8-core cable I used was this http://uk.rs-online.com/web/p/multicore-industrial-cable/6604052/?sra=pstk.
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My plan was to use fairly thin 8 core multicore cable for the signal connection (4 wire PT100 connection from the effector back to the Duet), and use the same cable for the heater/fan connector with 2 conductors in parallel for each of the heater wires. In the end I didn't change the heater and fan wires because they were already working well. I can't remember what gauge the conductors were, but the resistance per conductor was just under 0.1ohm per metre.
David, how about crimping two wires in one Microfit pin, does it fit?
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The probe and the PT100 signals don't interfere with each other. The 8-core cable I used was this http://uk.rs-online.com/web/p/multicore-industrial-cable/6604052/?sra=pstk.
Just to be sure; So you particularly recommend against tinning only on the ends of the cables from PSU that power the board, not on the 24V (or 12V?) terminals going from the board to the heaters?
In reference to third paragraph at Wiki: Power wiring
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It's best not to tin any of the wires that you are going to put into the terminal blocks. Crimp the ferrules supplied on the ends instead. It's OK to use pre-tinned copper wire because the tin coating is so thin.
In practice, tinning the ends of the heater wires before putting them in the terminal block is not so likely to cause problems, because they heat up less than for the VIN terminal block.
If you have tinned any wires before putting into the terminal blocks, tighten up the screws after every few hours of use. Eventually the solder will have moved out of the way and the screws will stop loosening.
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For the cabling, I was planning on using 6 core 22awg for the heater and fan connections,
and then for the PT100 and probe connections, I have lots of stranded cat 6 that I can use. Hopefully, the probe and the PT100 won't interfere with each other? Any thoughts?
I used 2 lengths of Stranded Cat5e UTP on mine with the heater connections using 2 pairs work fine.
Doug
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Did they go up on the site and all sell out already ?
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No they are on the site ready for stocks to arrive hopefully early next week
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@CaLviNx:
I had the dimensions worked out, I just wanted Tony's confirmation.
And suddenly a lot of non Tony's jumped in !!!!
If you wanted to ask only Tony, maybe you should email or PM him. This dimension is likely a result of other dimensions, and their tolerances. I imagine the tolerances are +/-0.1 mm, so the answer you are seeking is not a fixed value.
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@CaLviNx:
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The Last missing part of the puzzle (for me anyway) I have highlighted, I need the distance from the centre of the hole to the short edge of the effector
Please accept my apologies if it's out there and I have missed it
Good spot
Its 8mm I will update the documentation when i get a chance.
bot yes there are tolerances to all dimensions which i have not specified in my diagrams because i have not measured them over a batch of boards.
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Hope there'll be stock on Monday wink wink
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Hope there'll be stock on Monday wink wink
I could reply but I think what I could tell you would just cheese you off
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We are testing some right now
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I have put limited stock up on the website (what we have tested tonight)
We will test more tomorrow so if it goes out of stock tonight, don't worry we should get more up tomorrow.
