Couple of questons with regards to Contour toolpath in mastercam.

1. Depending on what I select Cutter comp in Control or Computer is there a reason why Inifite Look Ahead and/or Optimize are active..

Based on the help file when either of these options are available I would want them check, am i correct ?

2. I am machining a slot ( programming with cutter comp set to off), and I've been told ( from a friend) to use the Ramp option. Is there a reason why I would want to use a Ramp and not using a regular Contour type.

3. Multipasses- I know it depends on the tool you are using, however is there way to calculate how many multipasses you need to finish cutting your part.

i.e I'm using a 0.5 flat endmill to cut a 3 by 3 inch rectangle from a 5 by 5 inch block. Now If I create a countor toolpath without multipasses I still have some leftover stock in X and Y which I understand why. I turn on multipasses and want to enter in the number of passes and spacing ? Is there a way of calculating it or is it just a guessing game ?

Thanks for your help !!