Why does the flute length of my tool change after i've given it a length? Daniel Lyon October 19, 2012 16:21 When I enter the flute length of my tool it changes back to a smaller value. What is causing this? Have more questions? Submit a request Comments Daniel Lyon October 19, 2012 16:29 The flute length changes back to the protrusion length specified in the tool holder. Solution is to adjust the protrusion length in the holder and then switch back to the flute length of the tool. The change should now stay. CAMWorks won't let you have a flute sitting inside of a holder. The reason being is so that the machine doesn't crash the holder into your part. The protrusion length specified in the tool holder tab (next tab across) is the amount the tool extends past the bottom face of the tool holder.