counterweight

[disneytoy]

Quick question,

Those nice chrome counterweights, what are their weight?

Thanks

Max

[Dan]

100g and 200g.

[disneytoy]

Thanks Dan!

My motors finally came in today. Your firmware is running well on my Uno/CNC v3 shield. Just have to assemble thing and give it a try:-)

No biggy, But I have 20 tooth GT2 belt pulleys for the motors, left over from my 3D printer build. Is there a place in the firmware to specify this, or does it not matter?

I am looking in CONFIGURATION and didn’t find anything to do with pulleys.

I do see under the main Polargraph_server_a1:

const int DEFAULT_MM_PER_REV = 95;
const int DEFAULT_STEPS_PER_REV = 400; (is this microsteps?)

My motors are 1.8 degree steppers, I have a4988 with the jumpers set to micro steps x16 (I guess all 3 jumpers is x16)

Thanks again:-)

Max

[disneytoy]

I found you answered part of my question in a different post. You use 20 tooth pulleys, so I need not change anything in the firmware.

But, do I need to change anything for the microsteps? i’m using a4988 with all 3 jumpers on 16x microsteps.

Thanks.

“GT2 belt is a pitch of 2mm per tooth. You have 16 teeth. 16*2 is your circumference. 16*2/pi=10.1859164 is your diameter. We use 20 tooth pulleys, or 40/pi diameter.”

[Anonymous]

This is the default setting inside “configure.h”:

// motor details
#define MICROSTEPS (16.0) // change this. microstepping on this microcontroller
#define DEGREES_PER_STEP ( 0.9) // change this. as advertised by the stepper motor maker

Microsteps are already set to 16; if you have motors that perform 400 steps per turn, also the 0.9 value is already fine. Otherwise, if you have a motor performing 200 steps per turn, you should put 1.8 under DEGREES_PER_STEP.

[disneytoy]

Thanks PreNic!

[Dan]

Thanks, prenic! You rock!

[Anonymous]

Great resource, thanks for sharing.

[Author]

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