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Posted by GregS on March 22, 2010, 10:05 am
>On Fri, 19 Mar 2010 20:28:47 GMT, zekfrivo@zekfrivolous.com (GregS)
>wrote:
>>On another note, I have been trying to drive two steppers in sync, with
>>a configuration allready available. Its and XYZ table, but with no
>>Z. I added the Z and it would have drived one stepper OK.
>>I was going to add two DC power amplifiers to Tee off
>>the drive feed, to power the two steppers requiring 1.2 amp each.
>>Is there something wrong with this idea . Even the orginal idleing
>>will work as I see it.
>>I tried driving the steppers in parallel and series. The series worked
>>best but there is not enough torque with the way the current limit
>>driver is set, and I can't really change anything there, so thats why i want
> to add buffers.
>In other words, you want to do this?
> Stepper motor (2)
> -----
> .---. | |
> |M |---------|---|--------------
> .--- |---------|---|--------------
> | '---' | | X lead screw (2)
> | | |
> .-----. .-----. | | |
> | | | | | | |
> | o-----o o--. | |
> | | | | | | |
> '-----' '-----' | | |
> Control Driver | | |
> | | |
> | .---. | |
> | |M |---------|---|--------------
> '--' |---------|---|--------------
> '---' | |
> -----
> Table
>Why not do this:
> Stepper motor (2)
> -----
> .-----. .-----. .---. | |
> | | | | |M |---------|---|--------------
> | o--o--o o----' |---------|---|--------------
> | | | | | '---' | | X lead screw (2)
> '-----' | '-----' | |
> Control | Driver | |
> | | |
> | | |
> | | |
> | | |
> | | |
> | | |
> | .-----. .---. | |
> | | | |M |---------|---|--------------
> '--| o----' |---------|---|--------------
> | | '---' | |
> '-----' -----
> Driver Table
>(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)
That was my intention. The stepper driver will be buffered by
the additional amplifiers. The stepper driver is current limited, I can't change
it.
I am looking at a stereo amplifier to use. This is a Z vertical axis.
I didn't want to have two motors, but I have to live with it.
greg
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>a configuration allready available. Its and XYZ table, but with no
>Z. I added the Z and it would have drived one stepper OK.
>I was going to add two DC power amplifiers to Tee off
>the drive feed, to power the two steppers requiring 1.2 amp each.
>Is there something wrong with this idea . Even the orginal idleing
>will work as I see it.
>I tried driving the steppers in parallel and series. The series worked
>best but there is not enough torque with the way the current limit
>driver is set, and I can't really change anything there, so thats why i want to