Is there any news or blog on the Duet3



  • @dc42 Have you considered to make an expansion board with diffrent stepper drivers like the TMC2130 so we can get stealth chop on the X/Y axis? 🙂 I know the maestro have them, but would love to be able to use some with the duet



  • @dc42 so with steps and direction inputs the absolute position would not be known to duet? my thought towards absolute position encoder is that the printer will always know it position thus with a well build print no need for homing or mesh grid compensation between every prints.



  • @og3d said in Is there any news or blog on the Duet3:

    ................... my thought towards absolute position encoder is that the printer will always know it position thus with a well build print no need for homing or mesh grid compensation between every prints.

    Does an absolute position encoder retain the absolute position when power is disconnected? i.e when the printer is turned off? That's the only advantage that I can see because as long as you don't power off the motors at the end of every print, then the absolute position is retained. So it is currently only necessary to home when the printer is first turned on, not for every print. Likewise any mesh compensation (although a well build printer doesn't need it ☺ ).



  • To my best knowledge absolute encoder will know its position after power cycle, I think its due to absolute encoders are providing a unique position values.

    The place that I work they have a machine that has absolute encoders in its servo motor. It does not require homing sequence at startups.


  • administrators

    Are absolute encoders for linear position actually available, at affordable prices?



  • @dc42 the CUI AMT20, AMT21 and AMT23 sentries of encoders offer absolute output in spi, rs485 or ssi respectively and support software zero position setting. They can be had for about 50USD from digikey.

    They also have incremental encoders and commutation encoders for BLDC motors that don't already have commutation sensors, they set the commutation position relative to the motor pole position via software in a guide they provide.

    https://www.cui.com/amt-modular-encoders



  • This post is deleted!


  • As the TCT starts today, is there any chance to get an info / Look about new products on the Roadmap? Would really like to come over, but from germany it is quiet far... 🙄





  • @dc42 Yes they aren't cheap. I have been think about DRO for quit time similar to this.
    https://www.igagingstore.com/6-Absolute-Digital-Readout-DRO-Stainless-Steel-Su-p/205470.htm

    I know the DROs aren't fast enough to keep up with the motion but it could be used a reference to pull the positions when requested, like during boot up. What do you think?



  • Any updates? Still on track for Q2 this year as mentioned on another thread? Higher VIN limit? Presumably targeting a higher price?


  • administrators

    @doctrucker said in Is there any news or blog on the Duet3:

    Any updates? Still on track for Q2 this year as mentioned on another thread? Higher VIN limit? Presumably targeting a higher price?

    A batch of Duet 3 pre-production main boards is scheduled to be assembled this week or next. Following testing and some firmware work on them, we expect to provide some to key customers in February. We won't know how many working ones we have until we have tested them all. Many of the prototype boards failed testing because of a manufacturing difficulty related to the new stepper drivers, but we think that should be solved in this iteration.

    The price will certainly be higher, because the stepper drivers will cost more and there will be 6 of them. The higher specification processor and the CAN bus interface also contribute to the higher cost. So we expect the Duet 2 WiFi/Ethernet to continue to be mainstream for most applications.

    The maximum VIN voltage will be higher, probably around 35V-40V.



  • Thanks, thats great.

    Coincidentally has anyone shared or blogged about the relevant regulations that need to be met for shipped kits and prebuilts? I'm aware documentation should be in place for CE marking but it's largely the manufacturer's responsibility to ensure it is complete, unless it is called for then there is a fixed time in which it has to be delivered. Outside the remit of the machinery directive?



  • I somehow missed the news on the upcoming Duet3

    Have been rather slow with my projects, one of which requires higher power stepper drivers than what is commonly in use, and was looking at getting Duet2 for this.

    I really like the direction of Duet3
    Happy to see someone formally bring in CAN bus to 3D printing.
    two small issues I see, are no mention of if the process has an inbuilt FPU.
    And
    Not using the USB-C connector for interfacing.


  • administrators

    @grogyan

    In built FPU: the SAM 4E MCU in the Duet 2 have FPUs.

    USB-C: this is still too expensive to make it worth it for a connector that is only required for initial setup, if at all. Micro USB is ubiquitous and cheap (I bet nearly everyone has one of these cables in a draw).


 

Looks like your connection to Duet3D was lost, please wait while we try to reconnect.