Date   

Re: ci700

--Oz--
 

Regarding steppers, thanks for the 0.9 degree motors! I have never seen these before (only down to 1.8 degree), but I don't play with them much.
You mention low inductance. Since the ci700 is a step above the cge/lxd75 mounts in terms of payload weight capability, I figure go slightly larger (only a couple bucks more each, same size and only 8mm longer).
If you look at the comparisons, the slightly larger one has 1/3rd the inductance/resistance and about twice the current.

But what I am not sure is the voltage, the one you pointed out is 5.4v, but I am thinking your running them at 12v, correct?
The lower inductance is rated at 2.8v, would this work at 5V or 12V? (I have many 5/12V power supplies already and buck converts to get any voltage).
Motors here:
https://www.omc-stepperonline.com/nema-17-stepper-motor/nema-17-bipolar-0-9deg-36ncm-51oz-in-0-9a-5-4v-42x42x40mm-4-wires.html
https://www.omc-stepperonline.com/Dual-Shaft-Nema-17-Bipolar-09deg-44Ncm-6248ozin-168A-28V-42x42x48mm-4-Wires.html?search=Nema%2017%20Bipolar%200.9deg


Re: Encoders

--Oz--
 

On Tue, Dec 17, 2019 at 05:04 PM, Howard Dutton wrote:
If high speeds are a goal you should look at the limitations of the microcontrollers you plan to use
Its not my goal, but if its going to be 2 degrees/sec or less, that might be a slight bummer. Servo motors have a much higher speed range compared to steppers in general, but there is a few factors (gearing/motor-kv/voltage/etc)

For the arduino pro mini, do I want the 3v or 5v version (to use with the blue pill kit)? The stm32 is 3.3v, but its 5V tolerant, so i am guessing i could use either, correct? Of does it come down to powering them or? TIA


Re: Encoders

Howard Dutton
 

If high speeds are a goal you should look at the limitations of the microcontrollers you plan to use... onstep and the servo drivers.  stm32 might not be fast enough. Research the servo firmware limitations too.


Re: 3D Printed Star Tracker Design

Khalid Baheyeldin
 

Related: Roman Hujer designed a 3D printed OnStep powered mount.


3D Printed Star Tracker Design

John Scherer
 

This is NOT my design but I wish it was!  This design is really slick!

https://www.reddit.com/r/functionalprint/comments/ebxgv1/who_needs_a_400_star_tracker_when_you_have_a_3d/


Re: Encoders

--Oz--
 

I will order the blue pill kit C tonight when I get home. 

For the arduino pro mini, do I want the 3v or 5v version?

What kind of slew rates are you guys seeing (and what mount) ? (4/6/8 degrees/sec) For satellite tracking, lots of slewing going on :) 


Re: Microsteps slewing with ramps1.4 A4988

julianporter5@...
 

Thank you for the advice. It slews at a good rate now.  

Thank you for sharing your project I’ve had a lot of interest getting this far.

I will return to the ramps and A4988 and see if I can get get that going without the problems I was finding before. Now that I’ve a system with the MKS board I can see if it’s the drivers giving me a problem. 

If we ever get a clear sky again in the U.K. I’m going to put my camera on the mount and see how the goto works with something a bit less demanding than a scope. 


Re: Worm gear adjustment EQ3-2

Khalid Baheyeldin
 

On Tue, Dec 17, 2019 at 03:11 PM, <julianporter5@...> wrote:
So is the Eq5 a step above the Eq3-2 in terms of engineering quality or is just capable of carrying a heavier load?
Both.
Not that the EQ5 is outstanding quality, but still considerably better (or less bad) than the EQ3-2.


Re: Worm gear adjustment EQ3-2

julianporter5@...
 

So is the Eq5 a step above the Eq3-2 in terms of engineering quality or is just capable of carrying a heavier load?


Re: SHC and ST4 port

Dave Schwartz
 

On 2019-12-17 12:32 p.m., George Cushing wrote:
Anyone have a source or part # for the thumb/joy stick switch for the ESP32 SHC? TIA



Re: OnStep version 3

Howard Dutton
 
Edited

On Tue, Dec 17, 2019 at 09:53 AM, bjaffa Jaffa wrote:
If you have just promoted one to the other;
which will be the most stable of the 3.xx branches?

I have just newly built a MaxPCB with SSS 5160 stepper drivers; so from reading the wiki, I believe I need to use at least 3.xx versions.
I have a G11 direct drive with SSS2130 and OnStep v2.22d that has been functioning flawlessly and I want to upgrade.
Yes, 2.22 seems to be very solid, I think v3.x is getting there too though and I'd like more people to start moving to it so I can get more testing feedback.

Are there any wiki instructions for building the 3.xx firmware or is all the information contained in the config.h & advancedDriverSetup.txt?
You'll just have to read the Config.h files (SHC, WiFi, and OnStep are all changed) and really I doubt you'll want/need to mess around with the advanced driver setup stuff.  Everyone seems to like the new configuration design.  Eventually I will document it more in the Wiki but that will come after the v3 release.  In the mean-time let me note that it is important to look through the compiler output for helpful warning & error messages.


Re: OnStep version 3

Howard Dutton
 

The beta branch == master branch, at this moment.


Re: OnStep version 3

bjaffa Jaffa
 

What is the difference between the Master Branch v3.13c  and the Beta branch v3.13c? If you have just promoted one to the other;
which will be the most stable of the 3.xx branches?

I have just newly built a MaxPCB with SSS 5160 stepper drivers; so from reading the wiki, I believe I need to use at least 3.xx versions.
I have a G11 direct drive with SSS2130 and OnStep v2.22d that has been functioning flawlessly and I want to upgrade.
Are there any wiki instructions for building the 3.xx firmware or is all the information contained in the config.h & advancedDriverSetup.txt?

Thanks for any help

Brent


Re: SHC and ST4 port

George Cushing
 

Anyone have a source or part # for the thumb/joy stick switch for the ESP32 SHC? TIA

 


Re: RTC init failed

Alain K
 

Thanks Howard for the fast correction.


Re: Worm gear adjustment EQ3-2

Dave Schwartz
 

Yes, it is. You have to dismount the motor to get at the adjustment push-pull screws and then rotate the shaft manually until you find, and adjust for, the tightest spot in the axis rotation. There will then be spots where the mesh is looser than ideal but at least the gears won't bind and stall the motor. Such is the price to be paid with this class of machining. There is no such thing as uniform backlash with budget mounts.

On 2019-12-17 2:53 a.m., julianporter5@... wrote:
I found one of the bronze bearings to be quite worn. I’ve put the best bearings on the RA axis.

The worm gear adjustment looks Identical on the Eq5. Is backlash adjustment also problematic with the Eq5?


Re: RTC init failed

Howard Dutton
 

I fixed this, both the master and beta were updated.


Re: Encoders

Howard Dutton
 

On Mon, Dec 16, 2019 at 08:18 PM, --Oz-- wrote:
I already have the servo motors mounted, the A4950 drivers and have one arduino pro mini, so cost wise will be two bucks for another pro mini to try it out.
If it were me and I had a pair of perfectly good servo's already mounted up and ready to go, I'd be doing the same.  I look forward to hearing about how it goes.


Re: Worm gear adjustment EQ3-2

julianporter5@...
 

I found one of the bronze bearings to be quite worn. I’ve put the best bearings on the RA axis.

The worm gear adjustment looks Identical on the Eq5. Is backlash adjustment also problematic with the Eq5?


Re: Encoders

--Oz--
 

Thanks Khalid, I have acknowledged that I have been thoroughly warned!  :)

I already have the servo motors mounted, the A4950 drivers and have one arduino pro mini, so cost wise will be two bucks for another pro mini to try it out.