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I am facing a problem during arc cutting it's divide the arc on 3 points & on each point stop so it's not take it continually & for sure it cause problem
i try to change the tolerance in drawing import option but the best result i take it is with example that i send it

The corners in your drawing are made up of lots of very short line segments. SheetCam tries to join them up to form an arc but it may not be doing a very good job for your application. In SheetCam go to Options->application options->drawing import and increase the arc fitting tolerance. Try something like 0.2mm (0.005"). You need to import the drawing again for this to take effect.