duet3 and e3d ToolChanger and Motion System
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@dc42 Hi, I was planning to use Hemera with Duet Wifi and Duex5. Is there a reason not to do it?
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I'm currently building a E3D tool changer with a Duet 3. A couple of caveats:
- wiring kit requires recrimping and motor wires might be replaced
- mounting holes are incompatible
- sensorless homing will require tuning, I opted to add mechanical end stops for X/Y
I will only use 2 tools until extension board or the tool boards come available. You will need at least one external stepper driver if you want to use the Duet2. 5 internal steppers allow only 1 tool since 4 steppers are needed for motion and the tool changing lock.
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@jannau thanks
- I did not put wiring kit on the list
I like to use my own cables and crimp them myself, kinda had it with shitty alu cables and bad connectors - mounting holes for electronics or for something else? wrt duet itself I kinda plan to put it separate from the printer anyhow so this is also not a problem
- did not plan to use sensorless homing neither .. I kinda hate how inprecise it is, I'm thinking of making limit switches with piezo disks or I'll go optical, will decide.. but endstops for sure .. real ones
I totally forgot they use one driver for the toolchanger so yes, with duet alone without extension no room for second tool ... now, luckily I have bunch of TB6600 drivers that are stand alone so I can take step/dir from the expansion port directly there, or I can use some of the stand alone drivers I made with TMC2130 that should work too ... or I can use some of the closed loop steppers I have for test, again can go to exp port directly so I think I can manage to get it to run somehow on day one .. issue only is I'm not going to order duet3 till the expansion card is ready for shipment as I doubt duet3d can ship it to me cheap and I kinda hate to pay the shipping and handling twice ... so I'll hack it somehow with duet2eth first and then I'll order duet3 and redo it when times come
- I did not put wiring kit on the list
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looking now, duet2 + duex5 is 5+5=10 drivers, duet3+duet3expansion is 6+3=9 drivers, how come the expansion for duet is not at least 4 drivers if not 5 ?
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@smece Because with Duet3, expansion boards can be daisy chained. So you can add many additional boards and thus very many additional drivers (and heaters,end stops, fans etc).
Edit. And the existing 3 Channel expansion board is the first in what may become a family of expansion boards, depending on demand. -
@deckingman had no clue, great, thanks
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The reason we chose 3 for the first expansion board is that in a single CAN message we can fit the parameters for 3 stepper drivers.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 said in duet3 and e3d ToolChanger and Motion System:
single CAN message
hm, I missed this, need to go check D3 schematic
.. so extension boards for D3 are on can bus, not dir/step like on D2 ? interesting, I always wondered how they sync movement of can bus drivers without a "start / clock" line -
@smece said in duet3 and e3d ToolChanger and Motion System:
interesting, I always wondered how they sync movement of can bus drivers without a "start / clock" line
The main board periodically broadcasts its time (in ticks since start-up, where 1 tick is 1.33 microseconds) and the expansion boards use this to convert the start times of incoming movement commands to their local tick count.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 so you broadcast "local time" so that all modules can sync their time, and you send step commands (start at time X, do Y steps at speed Z ?? ) .. or you fill some "registers" on the dbus client that converts to commands? I have some tiny, tiny experience with MESA cards on ethernet and even less experience with modbus drivers...
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The main board sends the specification of the move. This is the scheduled start time, number of ticks for acceleration, number of ticks at steady speed, number of ticks for deceleration, start speed percentage of top speed, end speed percentage, number of microsteps for each drive, and which drives have pressure advance applied. The move specifications are sent about half a second before they are due to start.
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@dc42 cool, I'll check out the firmware to see how it works, I should have some time during holidays (for us xmass is in january so tomorrow the party starts and ends in mid-january
) to use to get acquainted, expect questions anyhow, a friend just surprised me with a duex5 (a prc clone he purchased and never used) so I'm fully covered till duet3 expansion board is ready for me to order them both
one additional question, how does the thermal sensing work on d3 + expansion? I have some semitec ntc's that go up to 300C that I love to use as I know them good and have ton of them (I needed exactly them for some project 9-10 years ago and semitec wanted to sell me only 300pcs and I needed 2
) so I'm using them everywhere, I think I still have ~50 of them .. I know a lot of ppl go for PT100 but I paid arm and a leg for these ntc's I wanna use them everywhere I can -
@smece said in duet3 and e3d ToolChanger and Motion System:
one additional question, how does the thermal sensing work on d3 + expansion? I have some semitec ntc's that go up to 300C that I love to use as I know them good and have ton of them (I needed exactly them for some project 9-10 years ago and semitec wanted to sell me only 300pcs and I needed 2 ) so I'm using them everywhere, I think I still have ~50 of them
If they are 100K NTC thermistors then reading them up to 300C will be no problem on either the main board or an expansion board.
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toolchanger arrived, I ordered a duet2eth+duex5 from e3d for now to get everything working and I'll go with 3 when expansions are avaialable .. no motors here need more than 24x2 so I think this will be ok for now
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@smece said in duet3 and e3d ToolChanger and Motion System:
with 3 when expansions are avaialable
Wait for toolboards.
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@Danal said in duet3 and e3d ToolChanger and Motion System:
@smece said in duet3 and e3d ToolChanger and Motion System:
with 3 when expansions are avaialable
Wait for toolboards.
what are toolboards?
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Toolboards are somewhat like a 3HC expander, except they are physically smaller, and have one of everything. One stepper driver, one heater mosfet, one thermal sensor input (actually, a couple), two fans (heatbreak and part), a few general I/O, and so forth. They are CAN attach.
Therefore, your tool changer can have two power wires, and 4 CAN wires, running to each tool. Instead of 10 or 12 wires.
Tool boards are currently in final beta, to be pre-order in the next couple of months, and general order soon after that.
Delta / Kossel printer fanatic
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@Danal said in duet3 and e3d ToolChanger and Motion System:
and have one of everything.
assumed so but was unable to find the link
coooooool ... definetely no reason to rush with d3 order, d2 will get the job done more then adequate and then I can move to d3 ... knowing myself I'm going to now dump my major test system and make something between my cubebot and this toolchanger but so far I dislike the corexy.. we'll see with bit more time with toolchanger maybe it grows on me .. currently my cubebot is operating with 2 independent X axes but will see how corexy shows up in real usage and how this new head changer thingy shows up before I decide to move on to new build... I surely have another 7-8 months to play with it before I can start making anything new (on some huge project attm that's supposed to be done before september, so ideal time to use TC as is without "improving" it ) ...anyhow what's much more interesting to me is the whole synchronous CAN movements, need to get that out of the firmware, as I had serious issue making something like that (over modbus but same thing) last year for some project, I had to introduce the "trigger" line and changed the "standard" modbus to some ugly custom monster I'm really not happy with.. and it was 2 axes only!!! so I'm stealing the ideas from RRF as soon as I ....
(I did take a peek in the source and it's not "my way of doing things" so it will take bit more time to figure everything out but hey.. that's why we do share the source so we can all learn ) -
@Danal hm, who's designing this tool board, I'd love to make some changes :D... I was planning to make one "huge board" out of duet2 + duex5 + "some upgrades" but looking at this concept now I like it more with a ton of can slaves and fewer wires .. but I'd love some "minor" changes to make it more versatile
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@smece said in duet3 and e3d ToolChanger and Motion System:
@Danal hm, who's designing this tool board, I'd love to make some changes :D... I was planning to make one "huge board" out of duet2 + duex5 + "some upgrades" but looking at this concept now I like it more with a ton of can slaves and fewer wires .. but I'd love some "minor" changes to make it more versatile
Like all of Duet's products, I'd imagine that the design is based on what end users want or have asked for. I'd also imagine that because Duet 3D is a business, their design decisions will be based on the potential sales volume of units. In which case, I'd also imagine that OEMs will have far more influence than us single users. There is of course nothing to stop you from contacting the Duet team with your design change requests. But if what you ask for is something that will only suit a single user, I doubt very much that it would be put into production.
