I’m not sure I’d put it all down the ball screw but I’m happy with the results.
@Bonch - I decided to have a go at the bed this evening. I had some interesting results. Initially I took off 0.2mm with a 1/4 end mill - I did this as around 1500mm a min. it wasn’t quite deep enough to remove the scoring from a previous job so ran the job again. Part way through the job I accidentally speed up the feed rate. Then I slowed it down. When I came to sand it down I found that changing the speed made a big difference to the quality of cut. I’d consider it to be a significant amount, but we’re talking fractions of MM’s.
As you can see there is still some prominence to the surfacing - although I think the lighting is enhancing this.
I then though well best run it at a slower speed to clear the marks up, but why not using a bigger end mill.
I then jumped up to a 10mm 4 flute cutter, but ran the job again without any edits. I did it so it would only take off 0.1mm but ran it allot slower at only 900mm a min, 10000 rpm.
This wasn’t quite enough so ran the program again - 0.1mm and could see a real improvement.
Here it is after 2 passes with the 10mm bit
What is interesting, is even with 2 passes of 0.1mm on the 10mm cutter there were still a few marks left from the 1/4 bit. I could have removed these with another pass but am going to see what 240 grit does tomorrow.
What is even more interesting is at the front it feels really smooth - no biting, but at the back I can feel more indentation. It’s only really noticeable from the back of the waste-board but gets worse from the centre back . I’m not really sure what could cause this…