Hi guys,
I hope anyone can explain me what I am doing wrong as it starts driving me crazy.
Below are two pictures of 140mm high letter cut out of 9mm thick MDF. If you look at the left part of the letter on the first picture you will notice a bad pass trim and the right part of it is clean and smooth. Th second picture is just zoomed version of the first one.
Actually it was only one letter from one job that have some part of the cut side in smooth nice cut. All rest pieces including this letter have this awfull trim all around them. Somewhere it's just a small thin trim that easy to sand off but in most cases it's quite thick. Another weird thing is that a cut left on waste material is perfectly smooth everywhere.
And it's not only that job that hasn't gone well, everything I have cut since I got a CNC Router was almost that bad on cut sides.
I cut the letter with a new 4 flutes 2.5mm carbide end mill. Spindle speed was 12000rpm and feed rate was 5000mm/min. Start depth was 2.5mm, cut depth 7.00mm. And for the mill settings cut pass was set to 2.5mm and stepover to 1.00mm
Thanks in advance.
Cheers,
Mike