Best posts made by Philn

@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

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

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

@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:'

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.