Correctly setting pots on pololus.
Posted by BloomingtonMike
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Re: Correctly setting pots on pololus. April 19, 2013 07:16PM |
I found this kit here: [www.ecomorder.com]. I have ordered it, though it is back ordered to the supplier whom I believe is in England. Could be faster for you to get it direct? The page has no webstore accoutriments, but I ordered by paypal. They do host a large tech forum. As such I will keep you posted as to when it shows up. It is diy only, they do not sell it assembled.
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Re: Correctly setting pots on pololus. April 19, 2013 07:35PM |
I've been wanting to give one of these a go, I've got to finish my mini CNC mill mechanics before I order one for an experiment though. 
Hoeken has been working with the THB6064AH driver on his open source CNC mill electronics (which look pretty awesome BTW). His github is loaded with goodies.
Edited 3 time(s). Last edit at 04/19/2013 10:32PM by akhlut.
- akhlut
Just remember - Iterate, Iterate, Iterate!
[myhomelessmind.blogspot.com]
Hoeken has been working with the THB6064AH driver on his open source CNC mill electronics (which look pretty awesome BTW). His github is loaded with goodies.
Edited 3 time(s). Last edit at 04/19/2013 10:32PM by akhlut.
- akhlut
Just remember - Iterate, Iterate, Iterate!
[myhomelessmind.blogspot.com]
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Re: Correctly setting pots on pololus. April 20, 2013 08:42PM |
hmmm interesting
instead of wiring series or parrallel
you could slightly mod it, draw out the logic pins DIR + EN + STEP, and "copy" this setup to another stepstick (out of ramps). so now using the same set of signals, use 2 stepstick to power 2 steppers. (i have not mod this myself yet, to do this you will need to prolly make it happen on a temp board outside the RAMPs PCB, like an external board)
and for VERY high current consumption steppers (more than 1A with ref to stepsticks), i found that adding larger capacitors do help in terms of stability. [3roomlabs.blogspot.sg]
then there is the micro stepping concerns due to use of correct Rsense on those stepsticks. and if you have good SMD skills, mod R4 to see if PWM frequency does improve stepping
[3roomlabs.blogspot.sg]
[3roomlabs.blogspot.sg]
my SMD skills are bad, i sacrificed a number of stepsticks lol
and of course the famous equation
Vref = A(stepper current) x 8 x Rsense
1.5volts = 2A x 8 x Rsense (=0.093ohms), i think you can use 0.1ohm Rsense if you use a Vmot voltage of 24-28v, cos when you use this voltage, Vref tends to go up to 1.65v. (or maybe this is an unintended flaw?)
it could be a good idea to know what Rsense values you have, like a certain stepstick i got, i assumed it was 0.05 ohm, but it wasnt, always good to check, you never know.
Edited 2 time(s). Last edit at 04/20/2013 08:48PM by redreprap.
______________________________________
__my mixed bag blog || aka --> [http] || ___ so 3D printing is everywhere ... dont worry, hospitals can now 3Dprint body parts, they will charge you $1million excluding surgical fees ... you will die paying your debts. thats their aim ___ if every patent expires tomorrow, everybody will surely get a 3dprinter and make EVERYTHING ! ____ there is a "DIY-DTG" t shirt printing forum, you can mod an EPSON printer to PRINT like a pro. ___ CNCzone? overly commercialized it seems ___ my country? they will be taxing you for every cm of road you use and track you to your grave using GPS and its government authorized, now they will fire all the traffic wardens instead.___ EEVBLOG? there is only 1 way to do things --> take it apart like a pro
instead of wiring series or parrallel
you could slightly mod it, draw out the logic pins DIR + EN + STEP, and "copy" this setup to another stepstick (out of ramps). so now using the same set of signals, use 2 stepstick to power 2 steppers. (i have not mod this myself yet, to do this you will need to prolly make it happen on a temp board outside the RAMPs PCB, like an external board)
and for VERY high current consumption steppers (more than 1A with ref to stepsticks), i found that adding larger capacitors do help in terms of stability. [3roomlabs.blogspot.sg]
then there is the micro stepping concerns due to use of correct Rsense on those stepsticks. and if you have good SMD skills, mod R4 to see if PWM frequency does improve stepping
[3roomlabs.blogspot.sg]
[3roomlabs.blogspot.sg]
my SMD skills are bad, i sacrificed a number of stepsticks lol
and of course the famous equation
Vref = A(stepper current) x 8 x Rsense
1.5volts = 2A x 8 x Rsense (=0.093ohms), i think you can use 0.1ohm Rsense if you use a Vmot voltage of 24-28v, cos when you use this voltage, Vref tends to go up to 1.65v. (or maybe this is an unintended flaw?)
it could be a good idea to know what Rsense values you have, like a certain stepstick i got, i assumed it was 0.05 ohm, but it wasnt, always good to check, you never know.
Edited 2 time(s). Last edit at 04/20/2013 08:48PM by redreprap.
______________________________________
__my mixed bag blog || aka --> [http] || ___ so 3D printing is everywhere ... dont worry, hospitals can now 3Dprint body parts, they will charge you $1million excluding surgical fees ... you will die paying your debts. thats their aim ___ if every patent expires tomorrow, everybody will surely get a 3dprinter and make EVERYTHING ! ____ there is a "DIY-DTG" t shirt printing forum, you can mod an EPSON printer to PRINT like a pro. ___ CNCzone? overly commercialized it seems ___ my country? they will be taxing you for every cm of road you use and track you to your grave using GPS and its government authorized, now they will fire all the traffic wardens instead.___ EEVBLOG? there is only 1 way to do things --> take it apart like a pro
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