Re: [Emc-users] microstepping stepper power drive
On Sunday 07 December 2008, Len Shelton wrote: >If you read that whole post, you'll share everyone's disappointment. >Apparently there is a bug in that chip that causes incorrect microstep >angles and Allegro is unwilling to admit it or correct it. > Thats a bummer. Maybe they used a funkity motor to develop the data? Just took the time to read the whole thread. Too many people wasted too much time with a broken chip. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) "Who is General Failure and why is he reading my hard disk ?" Microsoft spel chekar vor sail, worgs grate !! (By [EMAIL PROTECTED], Felix von Leitner) -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
Ian W. Wright wrote: > Can anyone give me a clue as to whether or not it is > possible to increase the power handling of any of the > microstepping stepper driver circuits available on the web. > I am quite confident you could change the power transistors and current sense resistors on the Gecko 201 drives and go up to 10 A/phase or so. I don't know how much work that would be to do, probably not too hard. It would void the warranty, of course. Jon -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
Thanks all, I had missed that thread on 'the Zone' - I don;t get time to trawl through it very often. I'm excited by Marriss's latest offer on that thread though and hope there is some way I can tap into it. I think I'll also have a play with Emory's ideas and see if I can fry a few 3055's. -- Best wishes, Ian Ian W. Wright Sheffield UK "The difference between theory and practice is much smaller in theory than in practice..." -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
On Sunday 07 December 2008, BRIAN GLACKIN wrote: >Perhaps this discussion will offer something to you. > >*New Allegro Bipolar Stepper Driver A3986* >http://cnczone.com/forums/showthread.php?t=24699 > >Opening post suggests 10A at 50V. Have not had the time to read the entire >set of posts. > That looks good. I wonder if Jeff at xylotex is working on it? >On Sun, Dec 7, 2008 at 10:23 AM, Ian W. Wright <[EMAIL PROTECTED]>wrote: >> >>How many wires do your motors have? >> >> >> > >Len >> >> One has 8, the other 6 so it doesn't really mater whether >> the drive is unipolar or bipolar. >> >> -- >> Best wishes, >> >> Ian >> >> Ian W. Wright >> Sheffield UK >> >> "The difference between theory and practice is much smaller >> in theory than in practice..." >> >> >> -- >> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, >> Nevada. The future of the web can't happen without you. Join us at MIX09 >> to help pave the way to the Next Web now. Learn more and register at >> >> http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.co >>m/ ___ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > >-- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, > Nevada. The future of the web can't happen without you. Join us at MIX09 > to help pave the way to the Next Web now. Learn more and register at >http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ >___ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) "Who is General Failure and why is he reading my hard disk ?" Microsoft spel chekar vor sail, worgs grate !! (By [EMAIL PROTECTED], Felix von Leitner) -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
You should be able to substitute bigger output transistors and emitter/source resistors for the originals. You might have to go to a lower resistance for the resistors to "trick" the drive into not going into protection. Halving their resistance would allow 5 Amps from a circuit designed to limit at 2.5 Amps, etc. If the drive uses TTL chips, there should be plenty of base drive for the heavier outputs. If CMOS, you might have to use Darlingtons for the outputs. Your stock drive probably uses plastic TO-220 outputs, right? Some 2N3055s (with proper heatsinking) would allow around 15 Amps. Resistance divided by 6, use 2 Watt non-wirewounds in parallel to get the power rating. Big honkin' NEMA 56 motors would be easy for it. hth, Emory On Sun, Dec 7, 2008 at 10:55, Len Shelton <[EMAIL PROTECTED]> wrote: > If you read that whole post, you'll share everyone's disappointment. > Apparently there is a bug in that chip that causes incorrect microstep > angles and Allegro is unwilling to admit it or correct it. > >>Len > > > > -Original Message- > From: BRIAN GLACKIN [mailto:[EMAIL PROTECTED] > Sent: Sunday, December 07, 2008 10:48 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] microstepping stepper power drive > > Perhaps this discussion will offer something to you. > > *New Allegro Bipolar Stepper Driver A3986* > http://cnczone.com/forums/showthread.php?t=24699 > > Opening post suggests 10A at 50V. Have not had the time to read the entire > set of posts. > > On Sun, Dec 7, 2008 at 10:23 AM, Ian W. Wright > <[EMAIL PROTECTED]>wrote: > >> >>How many wires do your motors have? >> > >Len >> >> One has 8, the other 6 so it doesn't really mater whether >> the drive is unipolar or bipolar. >> >> -- >> Best wishes, >> >> Ian >> >> Ian W. Wright >> Sheffield UK >> >> "The difference between theory and practice is much smaller >> in theory than in practice..." >> >> >> > > -- >> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, > Nevada. >> The future of the web can't happen without you. Join us at MIX09 to help >> pave the way to the Next Web now. Learn more and register at >> >> > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ >> ___ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > -- > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > > -- > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- "Those that forget the pasta are doomed to reheat it." Emory -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
On Sun, 7 Dec 2008, Len Shelton wrote:
> Date: Sun, 7 Dec 2008 10:55:50 -0600
> From: Len Shelton <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "'Enhanced Machine Controller (EMC)'"
> Subject: Re: [Emc-users] microstepping stepper power drive
>
> If you read that whole post, you'll share everyone's disappointment.
> Apparently there is a bug in that chip that causes incorrect microstep
> angles and Allegro is unwilling to admit it or correct it.
>
>> Len
Ah yes, I got all excited when that chip came out and built a 2 axis daughter
card for our Anything I/O cards (6A 50V) (the 7I41). The problem is that the
chip changes current control mode depending on whether winding current is
increasing or decreasing. While this may be appropriate for high speed
operation, it causes major current errors while stepping slowly. So we dropped
the 7I41. Allegro has a replacement the uses SPI instead of step+dir but I
lost interest. We will have a low cost step motor drive based on a DSPIC some
time next year.
>
>
>
> -Original Message-
> From: BRIAN GLACKIN [mailto:[EMAIL PROTECTED]
> Sent: Sunday, December 07, 2008 10:48 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] microstepping stepper power drive
>
> Perhaps this discussion will offer something to you.
>
> *New Allegro Bipolar Stepper Driver A3986*
> http://cnczone.com/forums/showthread.php?t=24699
>
> Opening post suggests 10A at 50V. Have not had the time to read the entire
> set of posts.
>
> On Sun, Dec 7, 2008 at 10:23 AM, Ian W. Wright
> <[EMAIL PROTECTED]>wrote:
>
>> >>How many wires do your motors have?
>> >>Len
>>
>> One has 8, the other 6 so it doesn't really mater whether
>> the drive is unipolar or bipolar.
>>
>> --
>> Best wishes,
>>
>> Ian
>>
>> Ian W. Wright
>> Sheffield UK
>>
>> "The difference between theory and practice is much smaller
>> in theory than in practice..."
>>
>>
>>
>
> --
>> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas,
> Nevada.
>> The future of the web can't happen without you. Join us at MIX09 to help
>> pave the way to the Next Web now. Learn more and register at
>>
>>
> http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
>
> --
> SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada.
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> pave the way to the Next Web now. Learn more and register at
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> https://lists.sourceforge.net/lists/listinfo/emc-users
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>
> --
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Peter Wallace
Mesa Electronics
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Re: [Emc-users] microstepping stepper power drive
If you read that whole post, you'll share everyone's disappointment. Apparently there is a bug in that chip that causes incorrect microstep angles and Allegro is unwilling to admit it or correct it. >Len -Original Message- From: BRIAN GLACKIN [mailto:[EMAIL PROTECTED] Sent: Sunday, December 07, 2008 10:48 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] microstepping stepper power drive Perhaps this discussion will offer something to you. *New Allegro Bipolar Stepper Driver A3986* http://cnczone.com/forums/showthread.php?t=24699 Opening post suggests 10A at 50V. Have not had the time to read the entire set of posts. On Sun, Dec 7, 2008 at 10:23 AM, Ian W. Wright <[EMAIL PROTECTED]>wrote: > >>How many wires do your motors have? > > >Len > > One has 8, the other 6 so it doesn't really mater whether > the drive is unipolar or bipolar. > > -- > Best wishes, > > Ian > > Ian W. Wright > Sheffield UK > > "The difference between theory and practice is much smaller > in theory than in practice..." > > > -- > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
Perhaps this discussion will offer something to you. *New Allegro Bipolar Stepper Driver A3986* http://cnczone.com/forums/showthread.php?t=24699 Opening post suggests 10A at 50V. Have not had the time to read the entire set of posts. On Sun, Dec 7, 2008 at 10:23 AM, Ian W. Wright <[EMAIL PROTECTED]>wrote: > >>How many wires do your motors have? > > >Len > > One has 8, the other 6 so it doesn't really mater whether > the drive is unipolar or bipolar. > > -- > Best wishes, > > Ian > > Ian W. Wright > Sheffield UK > > "The difference between theory and practice is much smaller > in theory than in practice..." > > > -- > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
>>How many wires do your motors have? > >Len One has 8, the other 6 so it doesn't really mater whether the drive is unipolar or bipolar. -- Best wishes, Ian Ian W. Wright Sheffield UK "The difference between theory and practice is much smaller in theory than in practice..." -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] microstepping stepper power drive
How many wires do your motors have? >Len -Original Message- From: Ian W. Wright [mailto:[EMAIL PROTECTED] Sent: Sunday, December 07, 2008 8:43 AM To: Emc-users@lists.sourceforge.net Subject: [Emc-users] microstepping stepper power drive Can anyone give me a clue as to whether or not it is possible to increase the power handling of any of the microstepping stepper driver circuits available on the web. There are quite a few designs about such as the PIC microstep project based on PIC chips but they are all limited to about 2A per phase. I have a couple of steppers which take about 4.2A per phase that I'd like to hang onto my Harrison Lathe but I can't find an economical way to do so - commercially built units are virtually all outside my available budget at the moment but I have a large stock of various electronic components which I could build from... As far as I can see, the limiting factor is the current monitoring which always seems to be tied to the output transistors/FETs. The fact that there are no designs published for drives handling currents in excess of 2.5A or so makes me wonder if there is some limiting factor that I don't know about. While I can build circuits and troubleshoot them relatively easily (back in the day, I built an Apple II clone using separate components and wire wrap and it worked!!), I'm no good at designing circuits - guess I've never just got down to learning all the maths... been too busy making things!! So, is there a way I could change the output transistors for higher current devices and just fiddle around with the values of current monitoring resistors or something?? -- Best wishes, Ian Ian W. Wright Sheffield UK "The difference between theory and practice is much smaller in theory than in practice..." -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] microstepping stepper power drive
Can anyone give me a clue as to whether or not it is possible to increase the power handling of any of the microstepping stepper driver circuits available on the web. There are quite a few designs about such as the PIC microstep project based on PIC chips but they are all limited to about 2A per phase. I have a couple of steppers which take about 4.2A per phase that I'd like to hang onto my Harrison Lathe but I can't find an economical way to do so - commercially built units are virtually all outside my available budget at the moment but I have a large stock of various electronic components which I could build from... As far as I can see, the limiting factor is the current monitoring which always seems to be tied to the output transistors/FETs. The fact that there are no designs published for drives handling currents in excess of 2.5A or so makes me wonder if there is some limiting factor that I don't know about. While I can build circuits and troubleshoot them relatively easily (back in the day, I built an Apple II clone using separate components and wire wrap and it worked!!), I'm no good at designing circuits - guess I've never just got down to learning all the maths... been too busy making things!! So, is there a way I could change the output transistors for higher current devices and just fiddle around with the values of current monitoring resistors or something?? -- Best wishes, Ian Ian W. Wright Sheffield UK "The difference between theory and practice is much smaller in theory than in practice..." -- SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
