Telescopic Z-axis
13 Jan 2016 07:58 #68289
by bigrig
Telescopic Z-axis was created by bigrig
Hi!
Does anybody know if there is an easy way to configure Z to be distributed to two servomotors with a specified ratio, lets say 30% of movement to 1st servo and 70% of movement to second servo to achieve a telescopic movement.
This is for a portal milling machine, to be able to maximize Z movement with limited roof height.
Appreciate any input on this subject!
/Lars
Does anybody know if there is an easy way to configure Z to be distributed to two servomotors with a specified ratio, lets say 30% of movement to 1st servo and 70% of movement to second servo to achieve a telescopic movement.
This is for a portal milling machine, to be able to maximize Z movement with limited roof height.
Appreciate any input on this subject!
/Lars
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13 Jan 2016 12:11 #68305
by andypugh
I suspect that there might be an easy way and an optimal way.
The easy way (assuming servos)
scale axis.2.motor-position-command by 0.7
pass the result to pid.2.command
subtract the result from axis.2.moto-position-command and pass the result to pid.3.command.
Sum the two feedbacks and pass to axis.2.motor-position-fb
The problem with the easy way is that it is not clear that homing will work.
Setting up the extra axis as a W and driving that explicilty in G-code might turn out to be a better solution.
Replied by andypugh on topic Telescopic Z-axis
Does anybody know if there is an easy way to configure Z to be distributed to two servomotors with a specified ratio, lets say 30% of movement to 1st servo and 70% of movement to second servo
I suspect that there might be an easy way and an optimal way.
The easy way (assuming servos)
scale axis.2.motor-position-command by 0.7
pass the result to pid.2.command
subtract the result from axis.2.moto-position-command and pass the result to pid.3.command.
Sum the two feedbacks and pass to axis.2.motor-position-fb
The problem with the easy way is that it is not clear that homing will work.
Setting up the extra axis as a W and driving that explicilty in G-code might turn out to be a better solution.
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07 May 2023 08:53 #270842
by rajsekhar
Replied by rajsekhar on topic Telescopic Z-axis
One trick just hit my mind..
If two axis motors are connected in Z axis with pitch set as double the actual pitch..both motor will operate simultaneously half distance in each one of the telescopic axes.
Hope this will be successful.
If two axis motors are connected in Z axis with pitch set as double the actual pitch..both motor will operate simultaneously half distance in each one of the telescopic axes.
Hope this will be successful.
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