5 axis Center of rotation

[andrew.todd1]

Hi guys.

See attached

Im stumped on something that should be pretty straightforward.

Using two different posts on two different softwares (Fusion and Powermill) im getting different z heights on the program when i post out a 3 + 2 toolpath with the trunnion (A axis) at 90 degrees.

Using the generic Doosan/Fanuc post in fusion do I need to offset anything to set my Z datum on the top of the machine bed? Or better to set z on the centre of rotation? (100mm up from bed)

Should the post be outputting G68.2 when moving off A0?

[engineguy]

@andrew.todd1 

Center of rotation on a standard Trunnion type setup is usually the point at where the Horizontal Axis and the Vertical axis cross, for example the swing axis is A and the rotating 360 deg axis is C the the point at which the A and C axis meet is your Datum.

Should be measured off carefully if it doesn`t show it in the Machine Manual, assuming you have one, otherwise start getting all your DTI measuring gear out 🙂

The same setup should be used in whatever software you are using so where you set you model in Manufacture Setup is the same.

That`s the basics of it, unless there are any oddball reasons (Manual again) there should not be any need for offsets but these you would put in the PP where the machine configuration is set 🙂

Stay Safe

Regards

Rob

[andrew.todd1]

Rob

Thanks

We have it from the machine manufacturer that it is exactly 100mm from the top of the machine bed to the center of rotation.

so, what your saying when setting a Z  datum it should be set 100mm from the top of the machine bed.

like in my screenshot?

[engineguy]

@andrew.todd1 

There you go, if the Machine Manufacturer is telling you that then that`s all you have to do, you can put all the measuring stuff away, save you a load of time 🙂 🙂 🙂

Stay Safe

Regards

Rob