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There are driver boards that mount on the back of NEMA stepper motors that contain a driver board, magnetic rotary encoder and microcontroller. You send DIR and STEP to it just like any other driver board and it uses PID to maintain positional accuracy. The two I have used are ustepper and mechaduino. I'd recommend mechaduino myself as the code is more developed and just feels more polished although I'm sure ustepper will catch up.
My intention is to use mechaduinos to drive the X and Y. You don't need Z as the nozzles are sprung so simplyand you don't need rotation as you use computer vision for positional feedback. Pretty much any driver board that allows you to swap out driver boards or use external ones would be suitable. I will be using a smoothieboard, or if it happens to be out by the time I'm ready a smoothieboard 2
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Pics of my machine in the works with the board on the far right, the board, and one of our "advanced peripherals" demos.
The factory is finalizing assembly of my first run of 100 of these right now, I hope to have them here after the weekend and will be launching sales at that time.
Happy to answer any questions.
Cheers,
Ray
What is the expected price of the remix?
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Hi Ray,
I think off board drivers are the way to go. I have had to replace a couple of drivers on my smoothie(operator abuse!) and it was a royal pita!
The ground plane on the smoothie is REALLY good at removing heat, making the driver ic quite difficult and time consuming to replace...
Is it smaller than the smoothie?
A head mountable/function specific controller would be really nice... ;) I have too many wires going to my head and I'm going to get headaches at some stage!
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Thanks Glen!SMdude: yes all this (6 drivers, the more powerful mosfets, and larger current capabilites/ thermals for them) all fit into under 4 inches square, the board is 101x101mm.I have been playing with CAT5 breakout boards for a while and that's how I've run all the wiring for my pnp head: roughly 3 cables going to the head for the 2 Nema 8's, the X motor, 2 endstops, the Z motor, and 4 pins are left for things I can't think of right now (LEDs, etc.)Wireb: the PCBs are coming fully assembled from the factory including with the white molex connectors on the motor and endstop connections. The only way to get screw terminals on board would be desoldering the existing connectors at your own risk (or, as you suggested, build the board yourself :) )Quick note: Smoothie cannot slave an axis in config as of now. Arthur's solution is to use physical jumper wires between the drivers to bind the signals over to the 2nd one. I don't consider this a valid solution.Arthur - I've had 5 separate complaints over the past week about not being able to double up an axis in config (define a 2nd set of DIR STEP EN pins to send alpha/ beta/ gamma signals to). What would be needed to make this happen?
Cheers,Ray
On Friday, November 18, 2016 at 6:27:37 PM UTC-5, Wireb wrote:The fact that > 5 axis are supported is a major selling point as I have dual driven Ys. Been trying to find a option that supports that out of the box and was not having much luck.By any chance does the PCB support screw terminals on the driver outputs? I really hate those crimp on connectors in machine tools. Had to many issues over the years with the tangs in the connectors loosening up / corroding and causing issues.Second question will there be a bare PCB option? (To head off the internet. Yes my time is not free and if included in the cost it would be cheaper to get it prebuilt. BUT... I like building cards and if I build it will take more time and prevent me from picking up more projects as fast saving money in the long run :P)
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