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Compensation Type Problems


Mejo
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Control should shift the tool to run on the side of the toolpath.  Computer should follow the toolpath at the center of the tool.  Computer had mastercam offset the toolpath the radius of the tool (or the amount indicated in the parameters).  Where as Control leaves the shift to your machine to move.  

Hope this is helpful.

 

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Computer offsets the tool but does not give you a comp option in the code (no G41 or G42). It is generally used for roughing where you do not need to make fine adjustments for tolerance.

Control there is no offset of the tool and assumes you are entering the cutter diameter/radius as the base (normally geometry column) number in your offset table. You then add or subtract from this to make your tolerance adjustment. This can be in the geometry or wear column depending on the control (most modern machines have a wear column). It posts out a G41 or G42 to apply the value of the tool diameter/radius you have entered in the geometry column.

This is pretty old school and is really a holdover from when there were no programming systems and people were hand programming from a print. So all you had to do was use the numbers on the print (for say your profile) and apply the comp at the machine. The downside is in some situations (narrow slots which are only slightly wider than the cutter you want to use for example) where there is not enough room for the comp to work because you need half your cutter diameter of perpendicular movement to your profile toolpath for the comp to be fully "bought" by the control.

Most people use Computer for roughing and Wear for finishing as the Wear option does not require as much perpendicular lead in for the comp to be effective (only the distance in the Wear column), but many others will argue for control, or that's "just how it is done in this shop for years".

Look at the top of the Industrial Forum for a long thread on this. All the pros and cons of the various options and how many people (percentage) use them

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4 minutes ago, Mejo said:

What happens when compensation is off what length will it use from the machine prams or master cam prams

OFF will run the tool centerline on the line/curve. Like Control but without the G41/G42 call so no comp applied (like computer) regardless of what is entered in the offset page of the control. I use this mainly for engraving letters/numbers, but there are other occasional uses.

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1 minute ago, Mejo said:

Also I am trying to use the same programs on three different machines how would this work

That's a pretty open question. It will depend on what the machines are, how they are set up and what post processors you have. We have a number of different machines and configurations here and we run basically the same programs on all of them. We have Haas and Mori Seiki. Depending on the part I might make a copy of the program and run different speeds and feeds for the two different machines as the Moris are capable of running much faster than the Haas machines. but everything else in the program will be the same. You could do this by making multiple tools with speeds and feeds for the different machines but this is more prone to error.

 

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