Creality Ender 3 Stock Factory Vref

README.md

Creality3D v1.1.2 stock vref values

A4988 Drivers
Vref set to ~90% of stepper rated current
Rs = 0.1ohm

X = 0,58v (0,725A)
Y = 0,58v (0,725A)
Z = 0,58v (0,725A)
E = 0,72v (0,900A)

Stepper Motor datasheets

Naming: [JK][S]HS[L]-[100][4]

JK: Manufacturer (jkongmotor) S: Size (42mm) HS: Hybrid Stepper L: Length (34/40mm) 100: Rated current 1.00 4: Number of wires

• X, Y, Z: 42x34 1.8deg 0.84A 4xwires jk42hs34-0844 yal8-23

• E: 42x40 1.8deg 1.0A 4xwires jk42hs40-1004a-02f

• http://www.jkongmotor.com/Product/42HS-NEMA17-2Phase-Stepper-Motor-1-8%C2%B0.html

• https://jkongmotor.en.made-in-china.com/product/pvdJZFXCiRks/China-Jk42hs40-1704-NEMA-17-3D-Printer-Stepper-Motor-42mm-Reprap-Motor.html

References

• https://reprap.org/wiki/Pololu_stepper_driver_board
• https://reprap.org/wiki/A4988_vs_DRV8825_Chinese_Stepper_Driver_Boards

@MaxMishchenko any chance you can reach out to your contact and see if they have details for the BJ42D15-26v12?

I've specs Here for both BJ42D15-26V12 and BJ42D15-26V19 (This is the same spec as the BJ42D15-26V02 hence drawing ID matching)

@not-crazyramen the currents listed on the blueprint are max currrent. To find the RMS divide the max current by 1.414. I run my Sprite extruder driven by TMC2209 UART at 600ma. Hope that helps.

Hi pal. It´s correct divide by 1.414. Is not multiplicate by 0,707 for RMS Value?

@not-crazyramen the currents listed on the blueprint are max currrent. To find the RMS divide the max current by 1.414. I run my Sprite extruder driven by TMC2209 UART at 600ma. Hope that helps.

Hi pal. It´s correct divide by 1.414. Is not multiplicate by 0,707 for RMS Value?

It’s the same thing…
1A/1.414=0.707A
1A*0.707=0.707A

Hi. I think you're wrong pal. I remember the electronic classroom in the first year and say0.707. i find this:

How to calculate RMS value of current?

Then, the RMS voltage (VRMS) of a sinusoidal waveform is determined by multiplying the peak voltage value by 0.7071, which is equal to one divided by the square root of two (1 / √2)

Dividing something with 1.414 is the same as multiplying something with 0.707. I’m not smart enough to see what the problem is. Hopefully some one else can help you.