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oddsfellow

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  1. Once again thanks for everyone's help. From the assistance given here was able to get a continual rotary axis path which avoided the acceleration and deceleration spikes but it did increase cycle time. Can only go as fast as the slowest axis and the linear axis will be quicker than the rotary but guessing this only really applies if you have long linear moves to make, which i do in this case. There was some visual, almost reversal marks after the original cut which did disappear doing a continuous rotary which is great so it ended up as a trade off between cycle time and surface finish. Then tried Aaron's approach of what i would call fanning and this sped up the cycle time and also gave an improved finish. Its a very smooth toolpath and is a blend between what i was doing and what i was trying to do but with better results. The other thing i am getting with this is because i am rolling around the ball rather than fixed at one contact point the tool life is also increasing. That would also apply to the continuous rotary toolpath too.
  2. Thanks for all your help guys. Using a trunion table bolted onto a 3 axis vmc but machining 5 axis simultaneous. i did find this article during searching yesterday which explains exactly what i am trying to do. essentially i am trying to do figure 7. https://www.moldmakingtechnology.com/articles/the-misunderstood-cutter-path . Will try what you suggested today and post back the results. Unfortunately it is a confidential part so cannot post pictures sadly.
  3. Doing some multiaxis machining in Mastercam and the surface is quite flat but then it has rounded corners. (Think of a cube with radii on the edge). For the vast majority of the motion its a straight linear move then as the part goes around the radius the rotary axis engages and has to accelerate very quickly and decelerate very quickly as the cutter goes around the corner before the machine goes back into a purely linear move. I thought if i drew a round curve around the object and used that to create the path it could then continually rotate the part avoiding the acceleration and deceleration and potentially smoothing out the motion. I cannot seem to get a toolpath that does this at the moment. Is there a way to do this inside mastercam?

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