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Messages - alsetn

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General Mach Discussion / Re: How to? Long accel/decel profile
« on: November 29, 2012, 05:26:21 PM »
"gentle" meaning zero velocity at each end during reversal. 

"...That is not going to happen with Mach3..."
Can Mach3 be tricked into thinking the move's more conventional by using normal speed in the instructions but multiplying the motor steps in the driver settings to increase actual distance traveled?

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General Mach Discussion / Re: How to? Long accel/decel profile
« on: November 29, 2012, 04:38:19 PM »
I think you are right about servos vs. steppers.  I will plan for that.
0 to 80ft. in .5 to1 sec. moving object about 4oz. mass.  Acceleration gentle and decel the same.  But the veloc. profile needs to be sinusoidal so at midpoint (40ft) accel ceases and decel starts.  Decel could be triggered by a switch at midpoint. 
The minor amount of slip can be corrected for and zeroed each cycle by switches along the slide and a home switch.
You mentioned the Gecko G215 as a possible dedicated controller without need for a PC.  Any other options off the shelf?
The big unknown for me is how to program the specific velocity profile.
Thanks all.

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General Mach Discussion / Re: How to? Long accel/decel profile
« on: November 29, 2012, 01:58:33 AM »
OK BR549, let's narrow it down.  Step resolution is not too important, high speed is.  If the motor has about 1200 oz in. torque maybe I can drive an 8 dia drive wheel and idler wheel to move the cable at a high linear speed.
Can I program exact number of steps for the whole length and plot them along their curves?  Can Mach3 or another program compute the curve?

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General Mach Discussion / How to? Long accel/decel profile
« on: November 29, 2012, 01:38:14 AM »
I will be moving a small object fast back and forth on an 80 ft. rail using one large stepper motor/driver and cable.  I need to program a smooth acceleration / deceleration profile evenly over the whole length.
Can Mach3 run this? 
TIA !

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