Date   

Re: Ground up Dob Mount #dob

Chad Gray
 

Howard, can we get a new tracking rate?  Sidereal, Lunar, Solar and ISS?

That would be awesome!  :)  We would need to have a lock out area around the mount like they do those robot arms in factories.

Chad

On Thu, Apr 28, 2022 at 8:48 AM <mthurtell@...> wrote:
Hey guys,

100% agree that satellite tracking is a lofty goal - hence it's on the stretch list. If I achieve both of the main goals, and maybe a bit of planetary/moon imaging. I will be a happy man indeed.

@Chad -
Did not think of just looking at the equations in the excel doc. Thanks for the link - I will check it out. 
Will be giving that video a good watch. 

@Arlen
Definitely some practical limitations on what can be achieved, especially with difficulties at the Zenith for Alt/az mounts. Maybe a brief period in a window around the zenith to rotate, line up and reacquire for the rest of the visual window.
I do have experience with a homebuilt CNC machine so aware of accel/decel forces on motors/gearing/general equipment. 

I think I will stick around George's suggested ratios and work backwards from there.


Re: Ground up Dob Mount #dob

Jacques Savard
 

 

 

For  my vintage  mount  hoem made

 

Di you have a kind  of  howto

 

Step by step   tp built  a onstep  drive 

 

 

If so 

 

I have  to find  stepping    part  list

 

And compute gear 

 

 

That it    maybe better  solution  for long time

 

 

For the moment   we try to  slow down the sincro motor  by  drive it at 30 hz

 

If  it ork  we can  make observation and later photo

 

 

Help please     put together  and  HOWTO

 

Jack  47 71

 

 

Not sure is anyone has tracked ISS with OnStep.

 

There is an excel sheet to help with the gear ration numbers it is just multiplying them.

 

This video helped me understand gear ratios.

 

On Thu, Apr 28, 2022, 5:56 AM <mthurtell@...> wrote:

Hi All,

Been on a bit of a hiatus from Astronomy - had a 6" no-name newt quite a few years ago and managed to pick up some good results of Jupiter and Saturn. Recently moved to a more remote location with generally clear-views of the sky and milky way straight from the backyard. I've been pretty successful with the binos doing some general poking around and decided I am going to get back into it. I'm a big fan of a short-mid term project and have been looking for something to whet my appetite for some time. I have toyed with the idea of doing an 8" newt from scratch including the mirrors - however - I have decided on a different route - buying a decent tube and building an Alt-Az with OnStep. I figure this will get me into the skies FAR FAR quicker than doing up a mirror from scratch, with the added bonus of saving a tonne of money on a mount, subsequently allowing to pour a bit more into scope. Finding OnStep has been a real eye opener. Big thanks to everyone involved.

Firm goals of the project:
  1. GoTo capabilities
  2. Tracking for visual
Stretch Goals in addition to the above: 
  1. General photography - planets and moon. No DSO/Galaxies (for the time being)
  2. Ability to track fast objects - ie ISS
  3. Take photos/video of said objects in 4.
No doubt that's probably pushing things for a typical Alt-Az Dob mount but hey, let's aim high.
Now a quick bit of background on me I'm Lead Engineer for an IT firm and run a small business designing and manufacturing electronics for the 4WD industry as a bit of a side hobby. 
I've got a fair amount of experience with most areas that OnStep will require. I wrote 90% of the MCU code for my projects, based on ESP32's. Whilst I didn't do the PCB layout itself, I have a solid working understanding of the boards used in my projects as well as experience with SMT soldering etc. It's been a interesting ride, but I definitely upskilled in alot of areas. I am comfortable with the firmware and electronics side of things. 

Where I am really having dramas - is with gearing. Having never done much with gears besides changing whilst driving, I'm afraid the whole gear ratio design is are just not syncing (ha!) in for me in the slightest. I've found another post in the main group - but I just need it fleshed out a bit for a some more understanding. The main post can be found here https://onstep.groups.io/g/main/topic/where_to_begin_24_f_4_dob/90662441?p=,,,20,0,0,0::recentpostdate/sticky,,,20,0,0,90662441,previd%3D0,nextid%3D1650906903151890504&previd=0&nextid=1650906903151890504

Quoting George (who I have been in contact with, Thanks George!)

I've quoted you in italics and underlined some highlights. My comments/queries in bold.

 

13866 where is this number from? 400 32 5 130
µsteps Steps/ µsteps GR-1 GR-2 /°arc rotation

Yes, if we track a full 160° from horizon to horizon we would have heard the pitter patter of 2,218,560 µsteps. A goto slew would take 69,330 full steps and a about a minute if we can attain 2.5°/ second slew speed. Of course I just pulled the GRs out of the air, but they are where I would start. 5:1 and 130:1 get you a total GR of 640Wouldn't this actually be a GR of 650? (5*130) A nice setup would be a NEMA 17 with a high precision 10:1 planetary GR and a printed 256 tooth gear driven by a 8 tooth spur (32:1). That would get you there. This would be a GR of 320? (10*32) Once you are over the machinations the rest will be easy.

I understand the overall 1:650 reduction, but not sure how we arrive and calculate that number using multiple gearsets. Any info would be greatly appreciated. I think I've read far too much and made it far more complex than it needs to be. Please put me out of my misery.

Cheers all,
Matt


Re: #wifi no connect #wifi

Dave Schwartz
 

Then you probably have defective soldering or connection somewhere between the STM32 and ESP8266.

On 2022-04-28 3:07 a.m., Szőllősi Tamás wrote:
i did it again, flash ESP8266 mini and then flash STM323103 with these configuration settings. ESP8266 blue LED does not work, will not be continuous, There is no OnStep in the Phone Connections menu.


FYSETC S6 v2 #configuration

Johnnie Pattison
 

I got the FYSETC S6 v2 working last night. Wifi, GPS and both axis'. I'm using the Bigtree TMC 2130 V3 drivers on both axis' the focuser. I am unable to get the focuser to do more than make a rough grinding attempt at movement, then it stops. I'm hoping that some Fysetc S6/TMC2130 users will share their focuser config with me, to point me in the right direction. Thank you. 


Re: Micro Stepping

George Cushing
 

The Tandon type steppers? Lots of problems with these; high voltage, 5 wire unipolar, 100 steps/rotation (3.6°/step) and pretty limited torque as I recall. Tandon made these themselves and Japan Servo Motors - type KP4M4-001, Minebea Co., Ltd - type 17PS-C007-04 or Shinano Kenshi Co., Ltd - type STH-42G100 were also used in these 5.25" floppy drives.

5 wire motors are hard to convert to bipolar.

You have cut the COM wire connection between the coils and IIRC it's impossible to get to it. Even if you could you're left with a 100 step motor and something like this.

5760.00000 100 32 4.5 144

 With 1.29 arc-sec/sec estimated tracking resolution it's fine for something like my visual only Vixen Polaris, but not where most folks are going. When there are $3 1.8° step angle motors around it doesn't seem worth the effort. Good source of being and 5mm shafts.



Re: Ground up Dob Mount #dob

Matt Thurtell
 

Hey guys,

100% agree that satellite tracking is a lofty goal - hence it's on the stretch list. If I achieve both of the main goals, and maybe a bit of planetary/moon imaging. I will be a happy man indeed.

@Chad -
Did not think of just looking at the equations in the excel doc. Thanks for the link - I will check it out. 
Will be giving that video a good watch. 

@Arlen
Definitely some practical limitations on what can be achieved, especially with difficulties at the Zenith for Alt/az mounts. Maybe a brief period in a window around the zenith to rotate, line up and reacquire for the rest of the visual window.
I do have experience with a homebuilt CNC machine so aware of accel/decel forces on motors/gearing/general equipment. 

I think I will stick around George's suggested ratios and work backwards from there.


Re: Ground up Dob Mount #dob

adraasch
 

Matt,

Tracking a satellite in low earth orbit with a motorized alt/az mount can be challenging, with any control system.  The reason is that as the satellite approaches your local zenith the azimuth axis of the mount suddenly must accelerate to a very high rotation rate.  If the satellite being tracked passes exactly through local zenith, an infinite rotation rate is required to track the satellite.  From a practical point of view, the satellite will be lost and the mount will have to reacquire the satellite on the other side of zenith.  This is unfortunate, as the satellite is closest to the observer at zenith thereby minimizing atmospheric effects on observing the satellite.

For visual observing, the observer also will be getting quite a workout trying to keep one's eye at the eyepiece.

Not all satellite passes approach local zenith, so alt/az mounts can be used successfully for some satellite observations.

Also keep in mind that slewing a small scope/mount rapidly and slewing a large scope/mount rapidly are too very different things as the inertia of the larger scope bring concerns about loads on the tripod during rapid acceleration or deceleration of the scope as well as the size of the motors to develop the required acceleration.

I have tracked the ISS and other satellites with various dob scopes I have, up to and including a 25" dob.  I use a low power wide field eyepiece and simply push the scope to track the satellite.  Obviously, this is no help for imaging the satellite.

Hope this helps,

Arlen


On Thu, Apr 28, 2022 at 7:25 AM Chad Gray <rchadgray@...> wrote:
Not sure is anyone has tracked ISS with OnStep.

There is an excel sheet to help with the gear ration numbers it is just multiplying them.

This video helped me understand gear ratios.

On Thu, Apr 28, 2022, 5:56 AM <mthurtell@...> wrote:
Hi All,

Been on a bit of a hiatus from Astronomy - had a 6" no-name newt quite a few years ago and managed to pick up some good results of Jupiter and Saturn. Recently moved to a more remote location with generally clear-views of the sky and milky way straight from the backyard. I've been pretty successful with the binos doing some general poking around and decided I am going to get back into it. I'm a big fan of a short-mid term project and have been looking for something to whet my appetite for some time. I have toyed with the idea of doing an 8" newt from scratch including the mirrors - however - I have decided on a different route - buying a decent tube and building an Alt-Az with OnStep. I figure this will get me into the skies FAR FAR quicker than doing up a mirror from scratch, with the added bonus of saving a tonne of money on a mount, subsequently allowing to pour a bit more into scope. Finding OnStep has been a real eye opener. Big thanks to everyone involved.

Firm goals of the project:
  1. GoTo capabilities
  2. Tracking for visual
Stretch Goals in addition to the above: 
  1. General photography - planets and moon. No DSO/Galaxies (for the time being)
  2. Ability to track fast objects - ie ISS
  3. Take photos/video of said objects in 4.
No doubt that's probably pushing things for a typical Alt-Az Dob mount but hey, let's aim high.
Now a quick bit of background on me I'm Lead Engineer for an IT firm and run a small business designing and manufacturing electronics for the 4WD industry as a bit of a side hobby. 
I've got a fair amount of experience with most areas that OnStep will require. I wrote 90% of the MCU code for my projects, based on ESP32's. Whilst I didn't do the PCB layout itself, I have a solid working understanding of the boards used in my projects as well as experience with SMT soldering etc. It's been a interesting ride, but I definitely upskilled in alot of areas. I am comfortable with the firmware and electronics side of things. 

Where I am really having dramas - is with gearing. Having never done much with gears besides changing whilst driving, I'm afraid the whole gear ratio design is are just not syncing (ha!) in for me in the slightest. I've found another post in the main group - but I just need it fleshed out a bit for a some more understanding. The main post can be found here https://onstep.groups.io/g/main/topic/where_to_begin_24_f_4_dob/90662441?p=,,,20,0,0,0::recentpostdate/sticky,,,20,0,0,90662441,previd%3D0,nextid%3D1650906903151890504&previd=0&nextid=1650906903151890504

Quoting George (who I have been in contact with, Thanks George!)
I've quoted you in italics and underlined some highlights. My comments/queries in bold.
 
13866 where is this number from? 400 32 5 130
µsteps Steps/ µsteps GR-1 GR-2 /°arc rotation
Yes, if we track a full 160° from horizon to horizon we would have heard the pitter patter of 2,218,560 µsteps. A goto slew would take 69,330 full steps and a about a minute if we can attain 2.5°/ second slew speed. Of course I just pulled the GRs out of the air, but they are where I would start. 5:1 and 130:1 get you a total GR of 640Wouldn't this actually be a GR of 650? (5*130) A nice setup would be a NEMA 17 with a high precision 10:1 planetary GR and a printed 256 tooth gear driven by a 8 tooth spur (32:1). That would get you there. This would be a GR of 320? (10*32) Once you are over the machinations the rest will be easy.
I understand the overall 1:650 reduction, but not sure how we arrive and calculate that number using multiple gearsets. Any info would be greatly appreciated. I think I've read far too much and made it far more complex than it needs to be. Please put me out of my misery.

Cheers all,
Matt


Re: Ground up Dob Mount #dob

Chad Gray
 

Not sure is anyone has tracked ISS with OnStep.

There is an excel sheet to help with the gear ration numbers it is just multiplying them.

This video helped me understand gear ratios.


On Thu, Apr 28, 2022, 5:56 AM <mthurtell@...> wrote:
Hi All,

Been on a bit of a hiatus from Astronomy - had a 6" no-name newt quite a few years ago and managed to pick up some good results of Jupiter and Saturn. Recently moved to a more remote location with generally clear-views of the sky and milky way straight from the backyard. I've been pretty successful with the binos doing some general poking around and decided I am going to get back into it. I'm a big fan of a short-mid term project and have been looking for something to whet my appetite for some time. I have toyed with the idea of doing an 8" newt from scratch including the mirrors - however - I have decided on a different route - buying a decent tube and building an Alt-Az with OnStep. I figure this will get me into the skies FAR FAR quicker than doing up a mirror from scratch, with the added bonus of saving a tonne of money on a mount, subsequently allowing to pour a bit more into scope. Finding OnStep has been a real eye opener. Big thanks to everyone involved.

Firm goals of the project:
  1. GoTo capabilities
  2. Tracking for visual
Stretch Goals in addition to the above: 
  1. General photography - planets and moon. No DSO/Galaxies (for the time being)
  2. Ability to track fast objects - ie ISS
  3. Take photos/video of said objects in 4.
No doubt that's probably pushing things for a typical Alt-Az Dob mount but hey, let's aim high.
Now a quick bit of background on me I'm Lead Engineer for an IT firm and run a small business designing and manufacturing electronics for the 4WD industry as a bit of a side hobby. 
I've got a fair amount of experience with most areas that OnStep will require. I wrote 90% of the MCU code for my projects, based on ESP32's. Whilst I didn't do the PCB layout itself, I have a solid working understanding of the boards used in my projects as well as experience with SMT soldering etc. It's been a interesting ride, but I definitely upskilled in alot of areas. I am comfortable with the firmware and electronics side of things. 

Where I am really having dramas - is with gearing. Having never done much with gears besides changing whilst driving, I'm afraid the whole gear ratio design is are just not syncing (ha!) in for me in the slightest. I've found another post in the main group - but I just need it fleshed out a bit for a some more understanding. The main post can be found here https://onstep.groups.io/g/main/topic/where_to_begin_24_f_4_dob/90662441?p=,,,20,0,0,0::recentpostdate/sticky,,,20,0,0,90662441,previd%3D0,nextid%3D1650906903151890504&previd=0&nextid=1650906903151890504

Quoting George (who I have been in contact with, Thanks George!)
I've quoted you in italics and underlined some highlights. My comments/queries in bold.
 
13866 where is this number from? 400 32 5 130
µsteps Steps/ µsteps GR-1 GR-2 /°arc rotation
Yes, if we track a full 160° from horizon to horizon we would have heard the pitter patter of 2,218,560 µsteps. A goto slew would take 69,330 full steps and a about a minute if we can attain 2.5°/ second slew speed. Of course I just pulled the GRs out of the air, but they are where I would start. 5:1 and 130:1 get you a total GR of 640Wouldn't this actually be a GR of 650? (5*130) A nice setup would be a NEMA 17 with a high precision 10:1 planetary GR and a printed 256 tooth gear driven by a 8 tooth spur (32:1). That would get you there. This would be a GR of 320? (10*32) Once you are over the machinations the rest will be easy.
I understand the overall 1:650 reduction, but not sure how we arrive and calculate that number using multiple gearsets. Any info would be greatly appreciated. I think I've read far too much and made it far more complex than it needs to be. Please put me out of my misery.

Cheers all,
Matt


Re: Slew Speed

 

In Android App, GoTo speed can be adjusted from 0.5x/0.75x/1x/1.5x/2x in application menu, which appears when you tap on three dots in top right part of main activity.


Re: TMC2226

 

On Wed, Apr 27, 2022 at 01:57 PM, T.K wrote:

Thank you, Otto, exactly the same topic.

My mount is an AltAz dobsonian. I'm using a 200 step motor and designed a pulley train with overall ratio of 810:1 on both axes.

The spreadsheet says it can reach 4 dps slew rate max using 32 microstep. Does it mean the mount can reach 3 dps for sure? And are 32 microstep and 14400 steps per degree suitable for tracking too?

14400 should work just fine for tracking.  If you have the mechanics of the dob mount complete, I would experiment with a few settings in config.h first to see if you can get your desired slew rate.  For example, you can switch from SQUARE to PULSE, and get about 1.6x faster rate.  With a TMC2130 or 5160 SPI driver, you can change the GOTO microstep value in config.h vs having to pull the driver like with the TMC2209 and change jumpers.

Just experiment a bit, and you can do some slew tests indoors.


Re: OnStepX - Guidance error

Reginaldo Nazar
 

Good Morning
Yes, I tested with phd2 and apparently it worked. thank you so much.

Em ter., 26 de abr. de 2022 às 08:09, Reginaldo Nazar via groups.io <rgnazar=astronomoamador.com.br@groups.io> escreveu:

But after his change the behavior changed.
On mobile now at 1x now correctly obeys north and south.
I couldn't test it with phd2 but when I do, I'll let you know.
Thanks


Em seg., 25 de abr. de 2022 às 20:25, Howard Dutton <hjd1964@...> escreveu:
On Mon, Apr 25, 2022 at 11:15 AM, Howard Dutton wrote:
Never seen that in my tests.
Took a look though... and see the issue.  Update from Github and try again.


Ground up Dob Mount #dob

Matt Thurtell
 

Hi All,

Been on a bit of a hiatus from Astronomy - had a 6" no-name newt quite a few years ago and managed to pick up some good results of Jupiter and Saturn. Recently moved to a more remote location with generally clear-views of the sky and milky way straight from the backyard. I've been pretty successful with the binos doing some general poking around and decided I am going to get back into it. I'm a big fan of a short-mid term project and have been looking for something to whet my appetite for some time. I have toyed with the idea of doing an 8" newt from scratch including the mirrors - however - I have decided on a different route - buying a decent tube and building an Alt-Az with OnStep. I figure this will get me into the skies FAR FAR quicker than doing up a mirror from scratch, with the added bonus of saving a tonne of money on a mount, subsequently allowing to pour a bit more into scope. Finding OnStep has been a real eye opener. Big thanks to everyone involved.

Firm goals of the project:
  1. GoTo capabilities
  2. Tracking for visual
Stretch Goals in addition to the above: 
  1. General photography - planets and moon. No DSO/Galaxies (for the time being)
  2. Ability to track fast objects - ie ISS
  3. Take photos/video of said objects in 4.
No doubt that's probably pushing things for a typical Alt-Az Dob mount but hey, let's aim high.
Now a quick bit of background on me I'm Lead Engineer for an IT firm and run a small business designing and manufacturing electronics for the 4WD industry as a bit of a side hobby. 
I've got a fair amount of experience with most areas that OnStep will require. I wrote 90% of the MCU code for my projects, based on ESP32's. Whilst I didn't do the PCB layout itself, I have a solid working understanding of the boards used in my projects as well as experience with SMT soldering etc. It's been a interesting ride, but I definitely upskilled in alot of areas. I am comfortable with the firmware and electronics side of things. 

Where I am really having dramas - is with gearing. Having never done much with gears besides changing whilst driving, I'm afraid the whole gear ratio design is are just not syncing (ha!) in for me in the slightest. I've found another post in the main group - but I just need it fleshed out a bit for a some more understanding. The main post can be found here https://onstep.groups.io/g/main/topic/where_to_begin_24_f_4_dob/90662441?p=,,,20,0,0,0::recentpostdate/sticky,,,20,0,0,90662441,previd%3D0,nextid%3D1650906903151890504&previd=0&nextid=1650906903151890504

Quoting George (who I have been in contact with, Thanks George!)
I've quoted you in italics and underlined some highlights. My comments/queries in bold.
 
13866 where is this number from? 400 32 5 130
µsteps Steps/ µsteps GR-1 GR-2 /°arc rotation
Yes, if we track a full 160° from horizon to horizon we would have heard the pitter patter of 2,218,560 µsteps. A goto slew would take 69,330 full steps and a about a minute if we can attain 2.5°/ second slew speed. Of course I just pulled the GRs out of the air, but they are where I would start. 5:1 and 130:1 get you a total GR of 640Wouldn't this actually be a GR of 650? (5*130) A nice setup would be a NEMA 17 with a high precision 10:1 planetary GR and a printed 256 tooth gear driven by a 8 tooth spur (32:1). That would get you there. This would be a GR of 320? (10*32) Once you are over the machinations the rest will be easy.
I understand the overall 1:650 reduction, but not sure how we arrive and calculate that number using multiple gearsets. Any info would be greatly appreciated. I think I've read far too much and made it far more complex than it needs to be. Please put me out of my misery.

Cheers all,
Matt


Re: #wifi no connect #wifi

Szőllősi Tamás
 

Tracking, GoTo okay, no WIFI connection


Re: #wifi no connect #wifi

Szőllősi Tamás
 

i did it again, flash ESP8266 mini and then flash STM323103 with these configuration settings. ESP8266 blue LED does not work, will not be continuous, There is no OnStep in the Phone Connections menu.


Re: Slew Speed

dougthomas408-1@yahoo.com
 

I use the Android app. I will double check the speed setting. Thanks.



On Wednesday, April 27, 2022, 07:13:36 PM EDT, Drew 🔭📷🚴‍♂️ <drewbolce@...> wrote:


How are you controlling OnStep? A common beginners misconception is that OnStep starts with the Max Speed available. For safety reasons, it does not. Depending on what version of OnStep you are using, it may start with the minimum speed or the 1X speed.

If you are using the Webserver this can be changed on the setup tab. The Android App has it under “Goto Speed” and the SHC has it under Setting/Configuration, "GoTo Speed".

OnStep can remember the max setting. Set "SLEW_RATE_MEMORY" to ON in the config file.


Re: Slew Speed

dougthomas408-1@yahoo.com
 

Excellent. I appreciate the responses... I wondered if there was a tradeoff in microstepping but couldn't find anything that suggested it would affect the speed. Thanks for the help.



On Wednesday, April 27, 2022, 06:56:00 PM EDT, Vladimir <cyberianice@...> wrote:


Yes, taken that we have similar setup, I can confirm You that with your current setup (MCU, gear ratio and motors) and with SQUARE wave form these are expected max GoTo speed:

1/128 microstepping = max goto speed ~1.75 deg/sec
1/64  microstepping = max goto speed ~2.5 deg/sec
1/32  microstepping = max goto speed ~5 deg/sec

With PULSE waveform just multiply further by factor of 1.6. So you have options: first to change STEP_WAVE_FORM to PULSE and then to reduce microstepping if you need even greather speed.

And one more thing, for drivers which supports native 1/256 interpolation there is no practical benefits from going more than 1/32 microstepping, but I think LV8729 are not capable of that. For otpimal speed vs resolution you should switch to 0.9 deg/step motors and drivers which supports interpolation for instance TMC2209 which you then run in smaller microstepping mode like 1/32...


Re: New Home Position

Ed Eastburn
 

Thank you Howard for the information. 

Another question.  Does "#define AXIS1_HOME_DEFAULT 0  // angle in degrees, for the RA or Azimuth Axis." go before the Default Value, or does it replace the Default Value, under AXIS1_HOME_DEFAULT in config.h?


Re: Slew Speed

Drew 🔭📷🚴‍♂️
 

How are you controlling OnStep? A common beginners misconception is that OnStep starts with the Max Speed available. For safety reasons, it does not. Depending on what version of OnStep you are using, it may start with the minimum speed or the 1X speed.

If you are using the Webserver this can be changed on the setup tab. The Android App has it under “Goto Speed” and the SHC has it under Setting/Configuration, "GoTo Speed".

OnStep can remember the max setting. Set "SLEW_RATE_MEMORY" to ON in the config file.


Re: Slew Speed

 

Yes, taken that we have similar setup, I can confirm You that with your current setup (MCU, gear ratio and motors) and with SQUARE wave form these are expected max GoTo speed:

1/128 microstepping = max goto speed ~1.75 deg/sec
1/64  microstepping = max goto speed ~2.5 deg/sec
1/32  microstepping = max goto speed ~5 deg/sec

With PULSE waveform just multiply further by factor of 1.6. So you have options: first to change STEP_WAVE_FORM to PULSE and then to reduce microstepping if you need even greather speed.

And one more thing, for drivers which supports native 1/256 interpolation there is no practical benefits from going more than 1/32 microstepping, but I think LV8729 are not capable of that. For otpimal speed vs resolution you should switch to 0.9 deg/step motors and drivers which supports interpolation for instance TMC2209 which you then run in smaller microstepping mode like 1/32...


Re: Slew Speed

Mike Ahner
 

On Wed, Apr 27, 2022 at 05:16 PM, dougthomas408-1@... wrote:
Microsteps: 1/128

Hi Doug,

It's not just about the mechanical ability of the motors to turn faster, it's also about the mpu's ability to calculate correct step pulses and issue them at the microsecond timing require to track. 

Because you're using 128 microsteps, the mpu is likely maxed out, Onstep calculates the max speed possible given your config.h desired speed, but adjusts downward to allow for the background overhead of calculating positions in the sky. Some boards/gear ratio, microstep combinations won't go much faster than 1~2 deg per second. Try changing steps to 64 or even 32, more is unlikely to produce any improvement you can see or measure.

You can also change the STEP_WAVE_FORM from SQUARE TO PULSE which usually will give good improvements in speed.
From the Config.h:
#define STEP_WAVE_FORM             SQUARE // SQUARE, PULSE Step signal wave form faster rates. SQUARE best signal integrity.

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