I had force set at 14g and changed it to 13g. Seems letters do not weed as easy on 13g as 14g. I just got this plotter a week ago and started with 10g and worked my way to 14 before getting an easy weed. I have the blade holder depth set to the 3rd notch (3mil) does setting it at 3.5 actually make the cut deeper? Thanks for info.
First off, the downforce setting on a Graphtec is not in grams or anything else for that matter. They're just numbers. Moreover it's not a linear scale, 20 is far more than twice as much as 10. Figure it out, the plotter goes from 20 to 600 grams yet the force numbers only go from 1 to 48. The best setting for vanilla vinyl is 18-20. This media is best cut somewhere in the neighborhood of 70-90 grams. Thus if 20 represents 90 grams and 48 represents 600 grams then the scale is nowhere near linear.
Not only is this intuitively obvious but has been confirmed after a lengthy conversation with the cognoscenti at Graphtec. They don't really know just what the actual setting represent, they're just numbers.
Secondly, one does not set blade depth by relying on the notches on the blade holder. You either remove the blade holder and manual run it over a scrap of vinyl or you do a bunch of test cuts to get it right. In theory if you have the downforce correctly set the blade depth shouldn't matter all that much. At least that's the theory. In actual use that is nonsense.
First set the blade depth so that it cuts through the media and slightly into the backing. Then set the downforce so that the blade just barely leaves an indentation on the backing without actually cutting the backing. At this point you should be somewhere in the ballpark.