Is there any way to have the machine not slow down when going on an arc/circle?

You can increase your continuous contouring and start/stop feed rate to reduce or eliminate it slowing in corners and curves. If both settings are at or above the speed you are cutting there will be no slow down.

Depending on what speed you are cutting eliminating the slow down could cause excessive wear to your components and possibly damage something. If the speed you are trying to maintain is exceptionally high the motors may stutter or lockup causing a loss of position.

-Jack

could you define "exceptionally high" ?

I was cutting at 100ipm...and my continuous contouring is at 70ipm. How fast is too fast to not have to worry about component wear?

Setting your continuous contouring to 100 would not be too much of an issue. You might need to check your set screws every few days.

The start/stop on the other hand I would avoid going above 50. This setting determines two things. When a motor must start moving this is the speed that the controller tries to move it at initially with no acceleration. Also when a motor must stop for example at a corner this is the speed that the machine will slow down to, once at this speed the motor will lock and not spin.

Any time you make a change to the feedrate settings i would suggest running a program without the plasma cutter on (or cut disabled if you have an AVHC) this will allow you to listen for binding and see if the settings you changed are able run successfully.

-Jack