Steps per rev for rotation axis

[cncmachineguy]

Building a new head and wondering, those that have direct drive NEMA 8 motor rotation, how many steps per rev do you have it set up for?

[Jim]

On Monday, December 23, 2019 at 12:19:51 PM UTC+1, cncmachineguy wrote:

Building a new head and wondering, those that have direct drive NEMA 8 motor rotation, how many steps per rev do you have it set up for?

With smoothieware 8.88889 steps/mm at 1/16, default feed rate 30000 mm/min, 5000 mm/s² acceleration.

Jim

[bert shivaan]

Thanks Jim.

So you have 3200 steps per rev correct?

And of course 1 mm ~= 1 deg?

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[Jim]

On Monday, December 23, 2019 at 12:56:30 PM UTC+1, cncmachineguy wrote:

Thanks Jim.

So you have 3200 steps per rev correct?

And of course 1 mm ~= 1 deg?

Correct. Have it running at 24V @ 0.4A for a year now.

[Mike M.]

@Jim,
I had to go With smoothieware to 17.7777 steps/mm at 1/32 - for all steppers double value - depending on driver ? Where is the magic - what I was doing wrong here?
Mike

[Mike M.]

Smoothieboard v1 has been the first released Smoothieboard and has received several updates.
It has gone from an experimental project to a widely used and acclaimed system.

It features :

32-bit Cortex-M3 LPC1769 with 512kB flash and 64kB RAM
3 to 5 A5984 stepper drivers with 1/32 microstepping
.....

[Jim]

Hey Mike, i have a bootleg with different drivers and a jumper for 16/32.

Jim

[bert shivaan]

Mike that makes sense, 17.7777 @ 1/32 = 8.88885 @ 1/16

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[Mike M.]

There is no way to change from 1/32 microstepping on Smoothiware except changing the steeper driver chip on smoothieboard- de-solder / re-solder new one, there is no Jumper to change stepping as well.
So for 1/32 is 17.7777.
Mike

[bert shivaan]

makes sense Mike, never had any experience with smoothie so was un aware

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[Jim Gmail]

Does Smoothie have headers to connect to external drivers, like TinyG does?

--JIm

[Mike M.]

Jim - Click here for large view_ http://smoothieware.org/pinout

No Header but ready for it if you wish to use external driver:

[Scott Wilson]

Does it have the same microstepping limitation when used with external drivers? I'm actually putting together a new machine with external drivers- I was going to use it with the smoothieboard I bought a while back, but 1/32 microstepping definitely isn't needed, and I imagine slows things down.

[Jim]

On Monday, December 23, 2019 at 4:51:41 PM UTC+1, Scott Wilson wrote:

Does it have the same microstepping limitation when used with external drivers? I'm actually putting together a new machine with external drivers- I was going to use it with the smoothieboard I bought a while back, but 1/32 microstepping definitely isn't needed, and I imagine slows things down.

Hi Scott, no there is no limitation when using external drivers, except the max. pulse rate is limited (~ 100 kHz).

Jim

 

[Mike M.]

@Jim - on Smoothiware you have  "a bootleg with different drivers and a jumper for 16/32".  Can you explain a bit more - I do not understand!?

Thanks Jim

Mike

[Jim Gmail]

Thanks!

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[Jim]

On Monday, December 23, 2019 at 5:47:58 PM UTC+1, Mike M. wrote:

@Jim - on Smoothiware you have  "a bootleg with different drivers and a jumper for 16/32".  Can you explain a bit more - I do not understand!?

At the board (see schematics page 4) jumper J3 goes to M0 of onboard DRV8825 (look table on page 13) to select 16 or 32 microsteps.

[Mike M.]

 Original Smoothiware is using A5984 stepper drivers and there is no such jumper ... you are on

MKS-SBASE

[Mike M.]

But I see a good solution in Nanotec

Sensorless Control of Stepper Motors

Closed-loop stepper motors as an alternative to BLDC motors

Much cheaper than servos and no additional cables needed to acheeve higher speeds

https://en.nanotec.com/knowledge-base-article/sensorless-control-of-stepper-motors/

https://en.nanotec.com/knowledge-base-article/video-how-to-run-stepper-motors-sensorless-and-without-encoder/

[Mike M.]

More here:

https://en.nanotec.com/news-trade-shows/news/archive/show/high-performance-dc-servo-motor-with-integrated-controller/

Mike

[Jim]

On Tuesday, December 24, 2019 at 9:42:33 AM UTC+1, Mike M. wrote:

 Original Smoothiware is using A5984 stepper drivers and there is no such jumper ... you are on

Mike, thought smoothieware is firmware, smoothie or smoothieboard is hardware, i have a bootleg (do not wanna tell vendor name again).
And there are a lot of smoothieware compatible boards out there, some are excellent, some are bad - i have one of the worst.

 

[Airhead Bit]

I just received my (to self) Xmas gift, the latest version of a clone that supports TMC5161 modules without wires, $19.95, the driver modules, almost as much as the board for one module!. Check  out the size next to  my pet Smoothieboard

[Airhead Bit]

That was a short lived thrill, they now have a SKR-1.4 Turbo with LPC1769 replacing the LPC1768 of the SKR-1.4 The Marlin 2.x code with VSCode and PlatformIO is sweet, compiled first try without errors. TMC5161 X,Y and TMC2130 Z,C SPI support. I don't know if they have optimized Marlin for TMCxxxx, removed the ramps, I do wonder if a P&P version with no curve fitting, ramps is possible.

[John deGlavina]

I have the SKR 1.4 in my 3d printer running Marlin 2. Crazy that they pump these things out for $20. 

[John deGlavina]

This is my config on my original Smoothieboard with 1/32 microstepping:

extruder.hotend.enable                       true             # Whether to activate the extruder module at all. All configuration is ignored if false
extruder.hotend.steps_per_mm                 17.77           # Steps per mm for extruder stepper
extruder.hotend.default_feed_rate            60000            # Default rate ( mm/minute ) for moves where only the extruder moves
extruder.hotend.acceleration                 6000             # Acceleration for the stepper motor, as of 0.6, arbitrary ratio
extruder.hotend.max_speed                    360              # mm/s
extruder.hotend.step_pin                     2.3              # Pin for extruder step signal
extruder.hotend.dir_pin                      0.22             # Pin for extruder dir signal
extruder.hotend.en_pin                       0.21             # Pin for extruder enable signal
delta_current                                0.4              # First extruder stepper motor current


extruder.hotend2.enable                      true             # Whether to activate the extruder module at all. All configuration is ignored if false
extruder.hotend2.steps_per_mm                17.77           # Steps per mm for extruder stepper
extruder.hotend2.default_feed_rate           60000            # Default rate ( mm/minute ) for moves where only the extruder moves
extruder.hotend2.acceleration                6000             # Acceleration for the stepper motor, as of 0.6, arbitrary ratio
extruder.hotend2.max_speed                   360             # mm/s
extruder.hotend2.step_pin                    2.8              # Pin for extruder step signal
extruder.hotend2.dir_pin                     2.13            # Pin for extruder dir signal
extruder.hotend2.en_pin                      4.29             # Pin for extruder enable signal
epsilon_current                              0.4              # Second extruder stepper motor current