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    Philn

    @Philn

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    Best posts made by Philn

    • RE: Need help figuring out using 60 Teeth pulley to drive my Y axis

      @sebkritikel

      Hello,

      I feel humbled that you have taken time to explain all this. Thank you very much. This is some truly important information that I need to learn.

      However I am OK with the XZ motion and my question is regarding the Y axis / bed movement.

      I attached an immage to my above reply.

      Do you mind taking a look?

      There is no reduction at all. I just want to use 60 Teeth 38mm pulley / idler instead of a 20 teeth 16mm diameter one and due to the larger diameter, I am afraid my motor won't be able to move the same amount of mass.

      So I would like to figure out if I need to get a more powerful motor or if its good enough.

      Does that make sense?

      Once again, thank you and I will study the things you shared and the links you provided. Cheers 🙂

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Bed slinger, core XY or other. What should I build?

      Thanks so much everyone for your valuable input.

      Following your advice, I decided to upgrade the bed slinger I'd built with somewhat better components for a relatively low cost, and build a CoreXY machine using the rest, which is going to be my 1st.

      Cheers 🙂

      posted in 3D Printing General Chat
      Philnundefined
      Philn
    • Can duet help me with planetary gear backlash?

      Good afternoon,

      I started working on building a CoreXZ printer called Voron Switchwire.

      This printer uses a counterweight (via a retractable keychain) to lift up the X assembly since the motors driving the CoreXZ system are not able to maintain the weight.

      Although unrelated, I know that Duet has advanced features such as pressure advance.

      To simplify the setup, I am thinking about using a stepper motor with integrated planetary gear reduction mechanism (5-to-1) and forgo the retractable keychain.

      From the specs sheet, however, I see that these mechanisms come wikth a "less than 1 degree" backlash.

      I do not understand how does this backlash could effect the movement of the axes.

      I guess my question is two folds;

      1st) Can duet make up for this backlash the same way it magically handles pressure advance?

      2nd) If I used the 5:1 geared motors to drive the axes, what kind of an affect could they have on the prints with their less-than-1-degree-backlash specs?

      I know many will say just build the the printer as specced but I was very excited to learn about the planetary gear system and I would love to have an actual understanding about these things.

      Thank you for your time, I am looking forward to learning about this.

      Cheers

      P.S.

      This is my first message on the Duet boards. I apologise in advance for any possible mistakes. I am posting this under General discussion. Please feel free to let me know or just move the thread to the appropriate board if it should belong elsewhere. Thanks again 🙂

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Need help figuring out using 60 Teeth pulley to drive my Y axis

      @deckingman

      I apologise for the confusion. I was so convinced that it was all clear 🙂

      Here is a picture demonstrating what I would have liked to explain:'

      example.jpg

      Current Y axis is a "typical" setup.
      Nema 17 with 16mm pulley with matching idler.

      I want to use instead a 38mm pulley with matching 38mm idler.

      My issue is, I assume, I will lose force / torque when moving the bed?

      P.S.
      Saving space is linked to the enclosure. If I use larger pulley / idler combo, I will be able to position things differently and run the belt around the rail on which the bed will be riding. Eitherway I am very curious
      about learning these torque, force etc. Most common printers from China, even Prusa use 20 teeth pulleys and I wonder what would happen with a larger set.

      posted in General Discussion
      Philnundefined
      Philn

    Latest posts made by Philn

    • Expanding Duet 2 Wifi with a 6th stepper driver for Triple-Z

      Hello everyone,

      Following my previous post, I decided to use one of my two Duets (2 Wifi) to build a CoreXY printer with a triple-z set-up.

      Which means I am going to need to add a 6th driver.

      I just finished reading:
      https://duet3d.dozuki.com/Wiki/Using_external_stepper_motor_drivers

      And got some questions:

      1. Can I use the 5 on-board drivers for Z-Z-Z+X+Y and use the additional 6th driver for the extruder? (my goal with this is, all 5 axis movements will end up using the same driver model)

      2. Can I use a TMC2209 as the extruder driver or would you recommend another type, say 2100 or even DRV8825? (I got TMC2209 and a DRV at hand, so would make it simpler)

      3. I admit, that article went a bit over my head. Are there any gotcha's or something you'd in particular advise me to pay attention to?

      I have ordered a break out board, the same in the article:

      abc1.png

      Thank you for your help

      P.S. I apologise if General Discussion is not the right place for this thread. I thought about posting under Duet Hardware but since the expansion will consist of external hardware, I wasn't too sure.

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Bed slinger, core XY or other. What should I build?

      Thanks so much everyone for your valuable input.

      Following your advice, I decided to upgrade the bed slinger I'd built with somewhat better components for a relatively low cost, and build a CoreXY machine using the rest, which is going to be my 1st.

      Cheers 🙂

      posted in 3D Printing General Chat
      Philnundefined
      Philn
    • Bed slinger, core XY or other. What should I build?

      Hello,

      To some this may come across as a no-brainer but I am kind of lost. To be honest I suck at making such decisions and your help is much appreciated.

      I have 3 printers. I want to upgrade / convert them and 2 good ones.

      I had one Duet board and got another one.
      2 Beds I have are 1 prusa mini bed + 1 regular prusa 3 magnetic bed and 1 low quality aluminium heat bed.

      Also have enough stepper motors. And got some additional Stepper Online ones (the "good stuff", apparently).

      If I were to get some additional parts, such as 2020 / 2040 extrusions, I could build 2 Core XY style machines.

      But is it really worth it, compared to bed slingers?

      That's what I'd like to know.

      I'd seriously appreciate your thoughts and input.
      Many thanks

      posted in 3D Printing General Chat
      Philnundefined
      Philn
    • RE: Need help figuring out using 60 Teeth pulley to drive my Y axis

      @sebkritikel

      Hello,

      I feel humbled that you have taken time to explain all this. Thank you very much. This is some truly important information that I need to learn.

      However I am OK with the XZ motion and my question is regarding the Y axis / bed movement.

      I attached an immage to my above reply.

      Do you mind taking a look?

      There is no reduction at all. I just want to use 60 Teeth 38mm pulley / idler instead of a 20 teeth 16mm diameter one and due to the larger diameter, I am afraid my motor won't be able to move the same amount of mass.

      So I would like to figure out if I need to get a more powerful motor or if its good enough.

      Does that make sense?

      Once again, thank you and I will study the things you shared and the links you provided. Cheers 🙂

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Need help figuring out using 60 Teeth pulley to drive my Y axis

      @deckingman

      I apologise for the confusion. I was so convinced that it was all clear 🙂

      Here is a picture demonstrating what I would have liked to explain:'

      example.jpg

      Current Y axis is a "typical" setup.
      Nema 17 with 16mm pulley with matching idler.

      I want to use instead a 38mm pulley with matching 38mm idler.

      My issue is, I assume, I will lose force / torque when moving the bed?

      P.S.
      Saving space is linked to the enclosure. If I use larger pulley / idler combo, I will be able to position things differently and run the belt around the rail on which the bed will be riding. Eitherway I am very curious
      about learning these torque, force etc. Most common printers from China, even Prusa use 20 teeth pulleys and I wonder what would happen with a larger set.

      posted in General Discussion
      Philnundefined
      Philn
    • Need help figuring out using 60 Teeth pulley to drive my Y axis

      Good evening,

      I am working on a CoreXZ bed-slinger powered by Duet. So far I managed to make good progress on CoreXZ mechanics.

      On the Y axis however, I'd love to be able to use 60 teeth pulley & idler for design purposes. This would allow me to save space and box things up nicely.

      From what I figure:

      • 20 teeth pulley has an outer diameter of ~16 mms.
      • 60 teeth pulley stands at 38 mms.
      • And I can estimate the weight of my bed assembly + the weight it should be able to carry

      This translates to a 2.4x distance increase from the shaft. And this is where I get lost as my knowledge in physics and torque calculation is limited.

      1st) Could you please help me with the following?

      • How can I figure out the torque value I should be looking for when buying a motor so that I can safely use 60T 2GT pulleys in order to drive the Y axis?

      2nd) Is my calculation below correct (excluding friction, which is sort of OK I hope for this application)?

      1. Using a 40 N-cm stepper, I get a torque rating of 4.5 kg-cm.
      2. At 8mms from the shaft (16mm OD 20 T pulley), the value jumps to 5.6 kgs (4.5 * 10)/8=5.6)
      3. However at 19 mms from the shaft (38mm 60 T pulley), this would go down to 2.36 kgs (4.5 * 10)/19=2.36)

      Therefore the motor would be limited to safely moving ~2kg

      Thanks in advance for your help and reminding me physics.

      One picture's worth a thousand words demo:

      example.jpg

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Can duet help me with planetary gear backlash?

      Many thanks @fcwilt

      This is great to know it will help a lot in the future I bet. The one I have is not the better version it seems though which is bit of a sad news.

      Do you mind if I ask what is your usecase for these motors? Are you doing a CoreXZ or similar?

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Can duet help me with planetary gear backlash?

      @Veti
      Backlash 🙂

      What I'd really like to know now is why they haven't used bigger motors with higher torque. I feel bad wasting their time with my questions though. They are already doing so much and I feel like abusing their kindness.

      posted in General Discussion
      Philnundefined
      Philn
    • RE: Can duet help me with planetary gear backlash?

      Hi! Thank you for the extremely rapid response. I couldn't believe my eyes.

      I read the 1st thread. I understand that compensation is a no-go.

      And I get your point regarding the 2nd question. Even if backlash wasn't an issue, things become slower..

      Do you mind if I trouble with you with a 3rd question?

      Bed-slinger printers are usually quite slow as far as I can tell if you want to get a decent print.

      If I was printing, say at around 60mm/s on avarage, would reducing the gear be an issue?

      Understanding acceleration/jerk vs speed was hard enough, when combined with torque I have no idea where to begin just to get the numbers.

      posted in General Discussion
      Philnundefined
      Philn
    • Can duet help me with planetary gear backlash?

      Good afternoon,

      I started working on building a CoreXZ printer called Voron Switchwire.

      This printer uses a counterweight (via a retractable keychain) to lift up the X assembly since the motors driving the CoreXZ system are not able to maintain the weight.

      Although unrelated, I know that Duet has advanced features such as pressure advance.

      To simplify the setup, I am thinking about using a stepper motor with integrated planetary gear reduction mechanism (5-to-1) and forgo the retractable keychain.

      From the specs sheet, however, I see that these mechanisms come wikth a "less than 1 degree" backlash.

      I do not understand how does this backlash could effect the movement of the axes.

      I guess my question is two folds;

      1st) Can duet make up for this backlash the same way it magically handles pressure advance?

      2nd) If I used the 5:1 geared motors to drive the axes, what kind of an affect could they have on the prints with their less-than-1-degree-backlash specs?

      I know many will say just build the the printer as specced but I was very excited to learn about the planetary gear system and I would love to have an actual understanding about these things.

      Thank you for your time, I am looking forward to learning about this.

      Cheers

      P.S.

      This is my first message on the Duet boards. I apologise in advance for any possible mistakes. I am posting this under General discussion. Please feel free to let me know or just move the thread to the appropriate board if it should belong elsewhere. Thanks again 🙂

      posted in General Discussion
      Philnundefined
      Philn