variations in tool path
An introduction to CNC - The basics
|Peter Saunders 1||13/02/2011 01:38:43|
|2 forum posts|
In my experience it is sometimes of importance to note that the PATH from the start point and the end point when using G0 and G1 is often different.
In that, with G0 each axis travels at the same maximum rate (speed) until it reaches the destination of that axis. As in the example above starting at X0,Y0 and moving to X50.0,Y25.0 the Y axis will be reached before the X axis. Because both axis'' are travelling at the same speed.
In the case of G1, the control manipulates the actual rate of each axis to achieve the correct fate of travel along the path. Using the same start point and finish point as above and nominating a feed rate (F) you will arrive at the XY point at the same time. It may not be an issue in most cases. but on occasion, there may be some part of the workpiece, clamp, etc. that is in the way. The solution is to simply to have your cutter far enough above the work and surrounds to address the possible issue. In my experience, while using the same cutter and moving positions to cut in different places, we only bought the tool to the rapid plane (.1000") above the surface. We did have a few close calls on occasion (our machines were travelling at 15,000mm/min). Great articles.
|Peter Saunders 1||13/02/2011 01:55:05|
|2 forum posts||Well what an idiot would be. I posted the GO- G1 before reading Part 2. Part 2 of course explains the difference. MT sincerest apologies to the author.|
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