Machine Slow on Curves

Hi everyone, new and have come here on advice from others who cant seem to crack the problem yet

Im having a problem on my machine when it does curves. It only has the problem when the curves are specifically made up of lots of smaller straight lines. It works fine on circles and it works fine when a curve is made up of lots smaller different radiuses.

What happens is the machine accelerates and deccelerates when doing the curve. I haven't got G61 activated. It is in G64 mode. I have also tried several P and Q parameters from 0 to 0.5 for each. this affects it minimally.

This wouldn't be a problem if cambam could output curves as radiuses but it seems cambam can only output a curve as lots of small straight lines.

Here is a video of what it is doing



Thanks for your help!

If you feel up to it. Try out the new trajectory planner.
linuxcnc.org/index.php/english/forum/10-...stersprograms-wanted
It is being created specifically to address this problem.

Todd wrote:

If you feel up to it. Try out the new trajectory planner.
linuxcnc.org/index.php/english/forum/10-...stersprograms-wanted
It is being created specifically to address this problem.

Hi,
well unfortunately I'm not very good at linuxcnc software and find following the above quite hard.

Cheers

BigJohnT wrote:

What is the maximum velocity and acceleration settings for the X and Y axis?

JT

x, y and z are all about 800mm/s^2

Max velocity about 6m/min for both. I already had some one suggest that i may have these setting set to slow, or one too slow compared to the others but it works fine with circles so this isn't the problem.

CamBam can easily output curves and circles that are arcs. What post-processor are you using?