Posts made by Orionm42

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What is the correct way to connect SDSK motors to a Duet 3 6XD controller, and which pins should go where? Thanks

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Thank you for your response,

we plan on using 3 clearpath servo motors for XY motion (cartesian IDEX kinematics), and 3 steppers with encoders along the Z-axis. We aren't yet sure about using servos along the Z-axis, as we haven't found an example of someone doing it, however, we're discussing it with Teknic. Additionally we need 4 steppers for automatic filament changing + 2 for extruders.

If we use servos for all axis', than we would use the following boards
-6XD
-Duet 3 mini 5+ (if needed more steppers in the future, could we also use Mini 2+ expansion board?)
-2x 1LC (for extruders)

Could you please verify if my understanding of the systems is correct:

If a stepper motor encoder detects a deviation, the board would send a correction.
If a servo motor encoder detects a deviation, it sends an error message to the main board.
Is there a way for sdsk servo to correct themselves while operating?

What are some pros/cons of using servos - over steppers with encoders?

We need 2 fans for air circulation in the heated oven. Due to a relatively large volume of the heated chamber, requiring big fans, we need external PWM controllers. Is there a way to control external pwm controllers via duet?

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@T3P3Tony
Thank you for your prompt response.
After some consideration we came up with the following design .

Duet 3 6HC as main board, connected to it:
4xNema 17
Probably 2x Dyzedesign Xtruder pro (would they be compatibale with TMC 2160a drivers), otherwise we will use 2x 1LC boards

+3x 1HCL with one of these motors:
Could you please verifiy that one of these motors are compatibale with 1HCL`s encoder imputs.
-https://www.omc-stepperonline.com/p-series-nema-23-closed-loop-stepper-motor-1-2nm-169-97oz-in-with-electromagnetic-brake-23e1kbk20-12

-https://www.omc-stepperonline.com/p-series-nema-24-closed-loop-stepper-motor-3nm-424-92oz-in-with-electromagnetic-brake-24e1kbk20-30

-https://www.omc-stepperonline.com/p-series-nema-34-closed-loop-stepper-motor-4-5nm-637-38oz-in-with-electromagnetic-brake-34e1kbk50-45

+3x 1xd board with Clearpath SDSK servos (not sure which model yet)

Additionaly, we plan to regulate 2 fans with the following PWM controller. Would it be possible to regulate fan speed via Duet 3 6hc with RS 485 interface over the break out expanison board?
https://www.goto-automation.com/si/products/frekvencni-pretvorniki/frekvencni-pretvorniki-1-fazni-230-vac/frekvencni-pretvornik-ls-electric-s100-1-fazni-0-75kw-230v-i

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Greetings,

we are planning on making a high temperature IDEX 3d printer.
Because the printer will have a fairly large build volume, thus enabling big prints of expensive materials such as ULTEM, PEKK,..
closed loop system is of significant importance to us. Initially we looked towards ClearPath SDSK servos, which (as far we understand) have "internal" encoders.
In case of lost steps would they be able to correct themselves, and how would the board respond, given the fact that servos don't give "feedback" back to the board?
As Duet now also offers 1HCL expansion boards, which have encoder inputs, would it be wiser to look in the direction of a closed loop stepper?
Is there currently any way to control a "true closed loop" servo system (with encoder inputs) with one of Duets boards?

What are some practical use cases for raspberry pi 4 as SBC (assuming you can find one ) ?

In an interview with @DC42, he mentioned that Duet is also developing new closed loop products, could you give some insight approximately when they will be released?

If we power the control board with a 24V power supply, than voltage on 3x2 pin JST VH connectors is also 24V?

Best regards