Postby Abni » Sun Aug 23, 2015 9:36 pm
Not answering the compressor question,,, it wasn't addressed to me and i don't want to be weird by hijacking the thread. However, I am here for the V carve coz it touches me to the core - I learnt a very expensive lesson there once.
Which one between one with twin screws and the single one do you consider the x-axis? if it is the twin screw then it implies that it could be resonance of the z-axis or the deflection of the tool. This usually results when I push my machine harder and very deep with vast Z extension. I am talking about 2.5mm+ doc though.
Try always doing this; raising the work near to the spindle while keeping the z extension small as pos and keeping the tool extension outside the collet short as pos. take deeper but slower cuts. This sounds somehow crazy but remembers more of the tool is being engaged so more support is needed. Try one and a half mm at 800 mm/min 16,000rpm
Engage a slower full depth end pass with a little 0.15 -1/4 stepover. Try clearing the chips as much as you can, lube stops sticking but also covers the slot and makes chips glue when they are re-cut.
At the best, these will not give a good finish and can go to the extent of causing tool deflection, overheat and eventually breakage. You can tell whether re-cuts is the problem or not because there will be few random dents on the top, definitely not similar to what you have which is a good wave rib. This is the reason why I think it is resonance from Z axis or deflection tool.
I have realized that the best solution is constant low pressure air cleaning the chips with the odd shot of coolant to ensure good stickage. Just ensure that the slot is clear and the blast of air works is good. However, to have a smart effect the air should be constant in order to clear all the chips. If you really need a smart finish then try using a full depth finish pass.
Try these and let us hear what you think. I hope you stick with it and make some more awesomeness!