Re: [Emc-users] OT: How is the kinematic system called usually used by 5axis water jet cutters?

[Viesturs Lācis]

2015-09-05 19:47 GMT+03:00 Florian Rist :
>
> By the way, has anyone built a water jet cutter? I need to sketch a
> concept quickly (over the weekend actually) and I'd be happen to be able
> to ask a few questions to someone more experienced.

I owned waterjet cutting machine for 6 years and did a complete
retrofit of CNC controls (yes, of course, LinuxCNC is running that
machine at the moment). Feel free to drop an email with any questions
you have, I will try to answer as good as I can.

IMHO that kinematics system of rotating the nozzle around TCP is very
nice and the main reason it is so widely used is because it is very
compact in dimensions. I have been trying to come up with something as
compact like that to be used in the 5 axis plasma machine I intend to
build for myself, but I have not come up with anything useful.
I have no idea, how is it called, I just know that timing belt is used
to drive that tilted rotary joint.

Viesturs

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Re: [Emc-users] OT: How is the kinematic system called usually used by 5axis water jet cutters?

[Viesturs Lācis]

2015-09-05 19:47 GMT+03:00 Florian Rist :
> The advantage is clear, the angles can be adjusted without moving the
> tool center point in space. I guess this was a advantage in the early
> years, simplifying the control (interpolation only in 4, not 5 axis,
> si), but why is the configuration still used today? And what is it
> called?

See that ring down near the surface of material, help in such a long
arm? That is used to probe material surface before piercing and during
cutting and also to prevent colliding nozzle somewhere. IMHO fixed TCP
is mandatory for anything like this. I do not see, how you could do
something like that with this kind of 5 axis head:
https://www.youtube.com/watch?v=NceH2zGzLyc
Yes, there is a ring for THC, but it does not provide correct height
as the nozzle is tilted.

Viesturs

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