LinuxCNC 2.8 Sections AXIS and JOINTS
- Cornflakes
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07 May 2018 13:58 #110327
by Cornflakes
LinuxCNC 2.8 Sections AXIS and JOINTS was created by Cornflakes
What are the differences in sections AXIS and JOINTS?
Parameters MIN_LIMIT, MAX_LIMIT seem to be equal in both sections
Parameters MIN_LIMIT, MAX_LIMIT seem to be equal in both sections
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07 May 2018 21:33 #110345
by rodw
Replied by rodw on topic LinuxCNC 2.8 Sections AXIS and JOINTS
A joint is a motor, an axis is the cartesion direction.
In version 2.7 ech axis is hardcoded Joint 0 = X, Joint 1 = Y, Joint 2 = Z etc.
In 2.8, joints are totally independent of this and its possible to more easily define an axis that comprises multiple joints (motors). The simplest of which is a gantry, a more complex one might be a robot arm. This is a major change that affected a lot of the linuxCNC internals.
And yes, the limit of travel is usually the same for a joint and an axis in a simple 3 axis machine but maybe not if you had two joints extending a crane boom to make up 1 axis or something like that.
In version 2.7 ech axis is hardcoded Joint 0 = X, Joint 1 = Y, Joint 2 = Z etc.
In 2.8, joints are totally independent of this and its possible to more easily define an axis that comprises multiple joints (motors). The simplest of which is a gantry, a more complex one might be a robot arm. This is a major change that affected a lot of the linuxCNC internals.
And yes, the limit of travel is usually the same for a joint and an axis in a simple 3 axis machine but maybe not if you had two joints extending a crane boom to make up 1 axis or something like that.
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09 May 2018 21:56 #110461
by andypugh
Most of the time they will be. But 2.8 allows them not to be where this is necessary or useful.
Replied by andypugh on topic LinuxCNC 2.8 Sections AXIS and JOINTS
Parameters MIN_LIMIT, MAX_LIMIT seem to be equal in both sections
Most of the time they will be. But 2.8 allows them not to be where this is necessary or useful.
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