Thank you!

+1000!

You are answering an almost 8 yr old thread?

Thanks! I was trying to do this yesterday and couldn't remember how to do it!

If the arcs are wireframe and you are using 2018 or 2019, first of all select all the arcs you want to change. Then use Analyze Entity, change the diameter of the last arc and press the blue "*" symbol next to it. That button is called "propogate arc radius" and will set the other arcs to the same size.

Without wishing to sound negative, I would recommend upgrading to X9 to start. The High speed toolpaths have always been glitchy / difficult and this was nowhere more evident than in X7 and X8. I never even downloaded them, went straight from X6 to X9, along with many others. I don't generally have a problem with reading parameters in from tools in my tool libraries as long as it is the initial set up. Where I still run into problems is editing a pre existing toolpath and being sure it "buys" the new parameters. The Apply button helps here before you Green Check out. I have even used the return to defaults and then re entering the edit, then Apply and this will sometimes force the new parameters.