The control by default has a calculation built in the will automatically adjust the velocity of the machine as it goes through arcs. This commands numeric parameter increases or decreases the default "speed control" that is applied to tangential arcs.
ERRATIC MOVEMENTS GRBL CONTROLLER CODE
You may want to check to see if someone has added a G09F# with some "stupidly large" value that would have increased the tangency threshold to the point that the 90 direction changes would be attempted without stop and start at the corner.Īnother thing to check is: IF the program generating the code has placed arc moves in the corners in order to "roll" the tool around each while still producing a square corner - then you should check for the presence of the ARC SPEED FACTOR parameter - G08F#. Any angel change larger than the threshold set by the Tangency Factor will still cause the machine to come to a decelerated stop and then an accelerated start in the new direction. You will see a Tangency Factor of 3-5 when you have 3d surface modeling where the toolpath is made up of small line segments with very small angle changes that are not tangent but that you would like the machine to "flow" through as it they were.
ERRATIC MOVEMENTS GRBL CONTROLLER SOFTWARE
Normally you do not need to increase the default as most software will create tangential line and arc segments when possible. The Tangency Factor on the older machines (Pre-Smoothing G07F#) set the threshold at which the machine would consider two entities tangential and thereby not coming to a stop, but instead combining the entities into the same motion/velocity curve. The default on the machines is usually 1. Hard to tell without seeing the code but, if it is a software/nc code issue than there are two things that I would check - Forrest's G09 is one.įorrest is referring to the " TANGENCY FACTOR" and the format is G09F#, where # represents 1 through 20.
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