Help with drill-Mill conversion

[Ross77]

Ok cutters arrived today, tryed the 6mm one and what a difference. 3mm deep cut in one pass with nice clean sides and no burrs on the edge. not sure on the cutting speed but the velocity is set at 400 mm/min. but the feed rate said 18mm/min I think . still need a bit more practice with mach.

You where definetly right Robin, I think I,m getting closer to the machines capabilities, althougth for what it is I'm more than happy with how it performed with the 6mm cutter. I'm sure that I can improve on the 3mm depth with a bit more tuning.

now its cutting clean edges It appears to be 0.3mm out, not sure if this is a step unit error ( had to round up to whole no.) or backlash. When I first tested it under no load I was getting 0.02 accuracy, is it possibly that the machine is still settling down? I dont think it can be machine flex as i was only typing the G-code line by line so it would have plenty of time to straighten up before the change in direction. I wont be to happy if the delrin nuts need constant attention tho...

[Robin Hewitt]

I'm sure that I can improve on the 3mm depth with a bit more tuning... now its cutting clean edges It appears to be 0.3mm out, not sure if this is a step unit error ( had to round up to whole no.) or backlash.

3mm deep sounds about right for a 6mm tool, so does 1420 rpm suggest you experiment with feed rates.

Measure the backlash, find out how much of the 0.3mm is accounted for. Perhaps a man has to ask himself, is Delrin better suited to free rolling gantry style machines?

I spent a lot of time and money removing the backlash from my machine, if I could have done the same with a plastic nut it would appear somewhat futile :whistling:

Robin