ratio leadscrew:motor not 1:1, where change code?

[bestbean]

You wrote "using e.g. 40 tooth gear on the leadscrew and 60 tooth gear on the motor".
If i would doing so, where should i change the code in nanoels.ino?

[kachurovskiy]

I would adjust the leadscrew pitch e.g. instead of #define LEAD_SCREW_HMM 200.0 use #define LEAD_SCREW_HMM 300.0 since 1 motor turn causes 1.5 leadscrew turns.

[bestbean]

That works, but display of mm is now not accurate:

void updateDisplay() {
  #ifndef TEST
  float posMm = pos * LEAD_SCREW_HMM / MOTOR_STEPS / 100;

[kachurovskiy]

I didn't find such a line in https://github.com/kachurovskiy/nanoels/blob/main/h2/h2.ino, would it make sense for you to download the latest h2.ino version and try from there?

[bestbean]

I'm using plain old H1 (latest version 9)

[kachurovskiy]

Oh right :) Can you please post your code to https://gist.github.com/ and add the link here so that I could understand the edits you've made? Many thanks.

[bestbean]

Sure. I've made two modifications, as advised (ratio encoder/spindle, ratio stepper/leadscrew.
The mm-display is not important for me, also it is only displayed on slow spindle rotation.

https://gist.github.com/bestbean/f9bd5c9af94eeeba440b8cada0f4db59

// Define your hardware parameters here. Don't remove the ".0" at the end.
#define ENCODER_STEPS 500.0 // 2000 step spindle optical rotary encoder, 1/4 of spindle rotation
// for 100t spindle 80t 600 step encoder it would be 600*100/80=750
#define MOTOR_STEPS 200.0 // 200 step stepper motor, no microstepping
// #define LEAD_SCREW_HMM 300.0 // 3 mm lead screw
// adjust if ratio stepper:lead screw not 1:1
#define LEAD_SCREW_HMM 250.0 // 70t stepper, 84t 3 mm lead screw (5:6)

[kachurovskiy]

Thanks! I think if you hold - and + buttons at the same time, angle indication will turn on. Can you check that making 1 turn with the spindle by hand produces 360 change in angle?

[bestbean]

Yes, angle indication is a useful feature.
I remember that indication is right, but I'll check this asap.

[bestbean]

Angle indication works: 1 turn with spindle shows 360 degrees.
If pitch 3 mm is set, leadscrew turns exactly at half speed of spindle.
But should be same speed.

What did i miss?

[bestbean]

My Stepper driver has 400 steps as default for 1,8 stepper, i never changed this.
But default setting in nanoELS Software: 200 steps, i also did'n t change.

OMG
Sorry for confusion.

[kachurovskiy]

No worries! Happy it's resolved 😀

[bestbean]

Thanks for your support!