--- In dynomotion@yahoogroups.com, <tk@...> wrote:

Hi Todd,

Could you think it through and provide more description of how you envision things should work?  I think some Users have created press brakes that work with a proportional valve and work much like a servo to move along a defined trajectory.  But it sounds like you want something simpler.  If you would want a 45 degree bend by entering G1 A45 that would assume that you were originally at A0?  So one idea would be to set the A axis up like a dummy Axis with very high speed.  Commanding G1 A45 F10000 would cause the Axis Destination to suddenly change from 0 to 45 degrees.  A KFLOP User program could then detect a positive change in ch0->Dest and enable the solenoid.  The program could then monitor the encoder Position and as soon as it reached the Destination disable the solenoid (if (ch0->Position > ch0->Dest) ClearBit(26);  ??

This would necessarily overshoot the target.  You might also monitor the velocity and assume some fixed time to stop and disable the solenoid before reaching the target.

How would you move back to zero?

I don't know of any similar example.  The closest might be OutputToPWM.c which monitors an axis Output and controls a PWM.  Actually something like that might work as well.  You might monitor the Axis Output.  A move would cause a change in destination which would generate a big Output.  That might be used to turn on the solenoid.  When the Output drops to Zero (getting close to target - depending on tuning) then turn off the solenoid.  Filtering and D Gain (Lead Compensation) might work to stop in advance.

Regards

TK

Group: DynoMotion	Message: 8369	From: Tom Kerekes	Date: 9/16/2013
Subject: Re: Hydraulic bender

Hi Todd, KFLOP does not normally wait for the encoders to move or be within a tolerance.  That could result in erratic motion.  It assumes the servo will follow within a tight tolerance or fault with a Following Error. But you could create a MCode to do this: #include "KMotionDef.h" main() {     //Solenoid on     SetBit(26);     // wait until Encoder Position catches     // up with the commanded Destination     while (ch0->Position < ch0->Dest) ;         //Solenoid off     ClearBit(26); } This will activate the solenoid, wait until the position is reached, and then disable the solenoid.  You might assign this program to MCode M100 Execute/wait/sync.  Then code:   G0 C45  (quickly change the Destination) M101    (activate solenoid, wait for encoder, disactivate) HTH Regards TK Group: DynoMotion Message: 8370 From: morgtod Date: 9/16/2013 Subject: Re: Hydraulic bender  That's what I was looking for!    I will mock up  the system and try it out. Thanks again, Todd --- In dynomotion@yahoogroups.com, <tk@...> wrote: Hi Todd, KFLOP does not normally wait for the encoders to move or be within a tolerance.  That could result in erratic motion.  It assumes the servo will follow within a tight tolerance or fault with a Following Error. But you could create a MCode to do this: #include "KMotionDef.h" main() {     //Solenoid on     SetBit(26);     // wait until Encoder Position catches     // up with the commanded Destination     while (ch0->Position < ch0->Dest) ;         //Solenoid off     ClearBit(26); } This will activate the solenoid, wait until the position is reached, and then disable the solenoid.  You might assign this program to MCode M100 Execute/wait/sync.  Then code:   G0 C45  (quickly change the Destination) M101    (activate solenoid, wait for encoder, disactivate) HTH Regards TK