speed a axis
24 Apr 2013 21:28 #33141
by decoyable
speed a axis was created by decoyable
Hey everybody,
In our cnc machine the a axis is slaved to the x axis so that they move seperate but can home seperately.
But I have some trouble finding the right speed settings for the A axis because in the x axis its mm/s and the a axis Degrees/ second.
The pitch of our leadscrews is 5mm so I thought i would put 5mm at x and 360° at a.
But this doesn't work ... the a axis is slightly faster than the x one.
I'll put the .ini and .stepconf files here with this message.
Any ideas?
B.
In our cnc machine the a axis is slaved to the x axis so that they move seperate but can home seperately.
But I have some trouble finding the right speed settings for the A axis because in the x axis its mm/s and the a axis Degrees/ second.
The pitch of our leadscrews is 5mm so I thought i would put 5mm at x and 360° at a.
But this doesn't work ... the a axis is slightly faster than the x one.
I'll put the .ini and .stepconf files here with this message.
Any ideas?
B.
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24 Apr 2013 21:38 #33142
by alan_3301
Replied by alan_3301 on topic speed a axis
[AXIS_3]
TYPE = LINEAR
all your axes are TYPE = LINEAR, so i don't see how it is reading degrees.
Are you sure you are loading the ini you posted?
Is the A axis linear or rotary?
TYPE = LINEAR
all your axes are TYPE = LINEAR, so i don't see how it is reading degrees.
Are you sure you are loading the ini you posted?
Is the A axis linear or rotary?
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24 Apr 2013 21:40 #33143
by alan_3301
Replied by alan_3301 on topic speed a axis
Also, your LINEAR_UNITS = inch so you must be running a different INI?
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24 Apr 2013 21:45 #33145
by decoyable
Replied by decoyable on topic speed a axis
yes if you look in the stepconf file you can see the amaxvel=360
and xmmaxvel=5 the difference isn't that big i'm talking on 10 cm movement theres a differenc of about 1 cm
btw all my stepper drivers are the same and are set in the same settings
and it is used as a linear axis in our setup but not in the settings
and xmmaxvel=5 the difference isn't that big i'm talking on 10 cm movement theres a differenc of about 1 cm
btw all my stepper drivers are the same and are set in the same settings
and it is used as a linear axis in our setup but not in the settings
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24 Apr 2013 21:46 #33146
by decoyable
Replied by decoyable on topic speed a axis
i didn't see that lol its the right ini but that wasn't changed yet 
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25 Apr 2013 06:43 #33173
by andypugh
It is a slave X axis.
One solution to this setup is to use gantrykins, though that is not without its problems.
There is a new kinematics in the even-more-expeimental-than-master branch called joints_axes3 which is called gentrivkins and works a lot more nicely for gantries than gantrykins does.
Coordinated movement between X and A is likely to not work quite as expected if LinuxCNC thinks that the second X axis is a rotary. (I know it is defined as linear, but A is not included in the linear trajectory calculations)
Replied by andypugh on topic speed a axis
This isn't an A axis, and treating it as such is likely to cause problems.In our cnc machine the a axis is slaved to the x axis so that they move seperate but can home seperately..
It is a slave X axis.
One solution to this setup is to use gantrykins, though that is not without its problems.
There is a new kinematics in the even-more-expeimental-than-master branch called joints_axes3 which is called gentrivkins and works a lot more nicely for gantries than gantrykins does.
Coordinated movement between X and A is likely to not work quite as expected if LinuxCNC thinks that the second X axis is a rotary. (I know it is defined as linear, but A is not included in the linear trajectory calculations)
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25 Apr 2013 19:20 #33191
by decoyable
Replied by decoyable on topic speed a axis
i worked out the gantrykins setup but its just the speeds that are still bothering us i just would need a way to make the slave x axis also lineair
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