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I did some modifications on this open source Gerber panelizer tool, so I can produce BOM and crentroid files for JLCPCB. Finally managed to get it to work. I created this 10x10cm panel for the TMC2660 driver.
When you order 5 panels (aka 20 drivers) the cost is about $9.5 per driver (with shipping). If I order 10 panels, it goes down to $7.5 per driver.
Btw. I did some thermal tests on the TM
by
ghent360
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Controllers
The challenge with the cap placement is that there has to be sufficient space around the chip for a heatsink and also it should not block the air flow (from right to left on the picture).
by
ghent360
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Controllers
An example of a high-voltage driver with external power connector (TMC2130 can go up to 46V):
by
ghent360
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Controllers
This is gizmo I managed to create this weekend for stabilizing the driver board:
This is a view of both sizes at the same time:
Fixed with two 3mm bolts to the controller PCB:
It is very sturdy, but not plug & play.
by
ghent360
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Controllers
Happy 2020 everyone. It is the year of the aluminum profile.
Connector choice:
There are many options on the table. I found PCIe connector for about $0.30 per connector. Uses standard 1.6mm board thickness. Pin headers have lower pin density and it is hard to find cheap ones with polarity locking.
Re: motor connector placement
On the controller board itself. Decided against that, because one ha
by
ghent360
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Controllers
I believe the MP10 uses STM32. Someone ported Marlin to the board. Google "monoprice mp10 stm32" and follow the links.
by
ghent360
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Controllers
I added a 100uF capacitor on the TMC2209 board. @dc42, in your opinion what is better 1 220uF capacitor or two 100uF on each side for the TMC2660 drivier?
Btw the quote for 10 of these assembled is $65.89, which comes to $6.59 per driver. This includes the price of components.
by
ghent360
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Controllers
Thank you for the feedback. All raised points are valid. Some comments:
PCIe connectors are rated 1A/pin. There are 5 pins of power for each 24V and GND. The PCIe spec allow for 3A 3.3v power delivery over 4 pins, which I guess they would have tested for reliability.
There are 100uF caps on the controller board, with the idea that every driver needs them and it would be more economical to place
by
ghent360
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Controllers
If you look at the driver picture there are two holes on both sides of the PCIe slot. I was planning on having a 3D printed plastic clip that would mount on the controller board and hold these in place so they don't wiggle out of place. I have the matching holes next to each PCIe slot.
I like SKR boards as well. They do try to make them very user friendly and are quite cost effective.
And to
by
ghent360
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Controllers
Quotefrankvdh
Instead of mounting them on the controller board, is there any reason not to mount them on the stepper itself?
Mounting the drives on the steppers is possible, but complicates the wiring. Now you have to carry power + a reliable means of communication (like CAN). This in turn makes the driver expensive. If you are doing drivers with integrated encoders, it makes more sense. Like in
by
ghent360
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Controllers
Greetings,
I've been designing my own controllers for about two years now. I really find the StepStick form factor to be limiting in two ways:
a) the board real estate is quite small and one has trouble fitting larger ICs like TMC2660 or TCM5161
b) the cooling on these is not great, because you have only one side exposed
On the other hand I have grown to appreciate the ability to quick
by
ghent360
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Controllers