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Warning: Question on periodic error that is non-Onstep specific
This looks like a good guess to me.
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This looks like a good guess to me.
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By
Howard Dutton
· #14723
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Warning: Question on periodic error that is non-Onstep specific
If that's a rigid coupling perhaps a flexible coupling of some sort would help.
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If that's a rigid coupling perhaps a flexible coupling of some sort would help.
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Howard Dutton
· #14721
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Warning: Question on periodic error that is non-Onstep specific
Yes, that would eliminate the possibility I suggested... Either way I have no plans to add Dec PEC to OnStep.
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Yes, that would eliminate the possibility I suggested... Either way I have no plans to add Dec PEC to OnStep.
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By
Howard Dutton
· #14720
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Warning: Question on periodic error that is non-Onstep specific
Not sure where your data is coming from but an incorrect calibration of RA/Dec angles on the imaging/guide camera makes it look as though there's some PE in Declination when it's really all RA.
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Not sure where your data is coming from but an incorrect calibration of RA/Dec angles on the imaging/guide camera makes it look as though there's some PE in Declination when it's really all RA.
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By
Howard Dutton
· #14717
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Warning: Question on periodic error that is non-Onstep specific
The Declination drive gears don't rotate within a period while tracking, and in-fact barely move if it moves at all, so there is no "periodic error" to correct.
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The Declination drive gears don't rotate within a period while tracking, and in-fact barely move if it moves at all, so there is no "periodic error" to correct.
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By
Howard Dutton
· #14711
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Edited
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The TMC2209
For my PCB designs this amounts to recommending the TMC2130, or the TMC5160 if you need more current handling. If you're building a Mini or Max you can afford the few extra bucks and the Teensy's/ESP3
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For my PCB designs this amounts to recommending the TMC2130, or the TMC5160 if you need more current handling. If you're building a Mini or Max you can afford the few extra bucks and the Teensy's/ESP3
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By
Howard Dutton
· #14706
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The TMC2209
I don't want to make exact recommendations in the driver summary, I get more specific in the PCB build instructions where we know something about the budget and what they are plugging into.
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I don't want to make exact recommendations in the driver summary, I get more specific in the PCB build instructions where we know something about the budget and what they are plugging into.
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By
Howard Dutton
· #14704
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The TMC2209
Yea, at Digikey the Watterott costs nearly $15 ea + shipping which is just too much when the SSS TMC5160 can be had for about the same money. These have to be the low cost option to find a place in th
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Yea, at Digikey the Watterott costs nearly $15 ea + shipping which is just too much when the SSS TMC5160 can be had for about the same money. These have to be the low cost option to find a place in th
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Howard Dutton
· #14697
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The TMC2209
The TMC2209 datasheet says: MS2, MS1: 00: 1/8, 01: 1/32, 10: 1/64 11: 1/16 And now we know that the SPREAD pin isn't brought out so OnStep can't switch between spreadCycle and stealthChop, except on t
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The TMC2209 datasheet says: MS2, MS1: 00: 1/8, 01: 1/32, 10: 1/64 11: 1/16 And now we know that the SPREAD pin isn't brought out so OnStep can't switch between spreadCycle and stealthChop, except on t
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By
Howard Dutton
· #14694
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Onstep and celesctron CGEM
Also in OnStep v3 w/TMC2130's you are free to use different current settings for slewing, tracking, and standstill.
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Also in OnStep v3 w/TMC2130's you are free to use different current settings for slewing, tracking, and standstill.
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By
Howard Dutton
· #14693
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Onstep and celesctron CGEM
I figured dropping the current would do the trick, I've seen it happen too many times now. I also see the issue with the FYSETC TMC2209... no spreadCycle/stealthChop switching on the same mode control
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I figured dropping the current would do the trick, I've seen it happen too many times now. I also see the issue with the FYSETC TMC2209... no spreadCycle/stealthChop switching on the same mode control
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By
Howard Dutton
· #14692
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Edited
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Non goto HEQ-5
Scroll down to the bottom of that page to see my EM10 mount where the MiniPCB controller is behind the black plastic cover plate.
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Scroll down to the bottom of that page to see my EM10 mount where the MiniPCB controller is behind the black plastic cover plate.
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By
Howard Dutton
· #14689
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Onstep and celesctron CGEM
Again, just bringing this to the top... because It's most important in my mind. Even those TMC2130's might be ok at 30% power (about 0.7A or 0.8A peak i.e. Vref = 0.7 or 0.8V) if that gives good slewi
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Again, just bringing this to the top... because It's most important in my mind. Even those TMC2130's might be ok at 30% power (about 0.7A or 0.8A peak i.e. Vref = 0.7 or 0.8V) if that gives good slewi
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By
Howard Dutton
· #14669
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Edited
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Onstep and celesctron CGEM
He has the SSS TMC2209's why not use them.
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He has the SSS TMC2209's why not use them.
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By
Howard Dutton
· #14667
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Onstep and celesctron CGEM
Except for low cost I really don't see what the LV8729 brings that the TMC2209 doesn't do better. Much of the stepper driver heat dissipation comes from the transistors in the drivers doing the h-brid
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Except for low cost I really don't see what the LV8729 brings that the TMC2209 doesn't do better. Much of the stepper driver heat dissipation comes from the transistors in the drivers doing the h-brid
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By
Howard Dutton
· #14665
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Onstep and celesctron CGEM
I'd choose a 1.7A motor given the overall reduction.
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I'd choose a 1.7A motor given the overall reduction.
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By
Howard Dutton
· #14663
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Onstep MKS-Gen L
This is supported in the WiFi Addon. Look at the Addon's Config.h file and also OnStep's Pins.Ramps14.h Simple ON/OFF digital switching is supported in the WiFi Addon, you could use that. Then there i
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This is supported in the WiFi Addon. Look at the Addon's Config.h file and also OnStep's Pins.Ramps14.h Simple ON/OFF digital switching is supported in the WiFi Addon, you could use that. Then there i
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By
Howard Dutton
· #14660
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Web Page Formatting
I feel better about donations that happen after the build reaches its successful conclusion, but thank you in advance. http://www.stellarjourney.com/index.php?r=site/equipment_onstep
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I feel better about donations that happen after the build reaches its successful conclusion, but thank you in advance. http://www.stellarjourney.com/index.php?r=site/equipment_onstep
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By
Howard Dutton
· #14658
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Onstep and celesctron CGEM
I would try running at about 0.8A for those motors. Also the mount could have mechanical trouble too for all I know, in need of worm/wheel adjustment causing binding, that kind of thing.
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I would try running at about 0.8A for those motors. Also the mount could have mechanical trouble too for all I know, in need of worm/wheel adjustment causing binding, that kind of thing.
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By
Howard Dutton
· #14657
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Onstep and celesctron CGEM
As always feel free to experiment, but it is difficult to imagine why a 4:1 reduction isn't more optimal for reaching higher slew speeds... The motors are high current/low inductance type so should be
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As always feel free to experiment, but it is difficult to imagine why a 4:1 reduction isn't more optimal for reaching higher slew speeds... The motors are high current/low inductance type so should be
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By
Howard Dutton
· #14656
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