Figuring out accuracy

I cut this yesterday and wonder if it could be belt tension that leads to the issues. The lines are not straight and the holes are a little out of placement .

The dimensions are 50mm x 200mm so it’s kind of small for the Maslow.

I used the same feed rate from my earlier cuts. Around 800 with 12000rpm(600W Spindle). The flute is a “once used” 3.175mm uncut I believe. I got nice chips and no expensive sounds.

As I’m just getting back in the game and haven’t checked any info on the newest upgrades, I wanted to do the cut with the config that worked last use before upgrading. Therefore, firmware version is 1.01 and my index.html is still at 0.88.

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Belt tensions could for sure be an issue. Are you seeing them too tight or too lose?

Not really. They all seem pretty fine to me, but I’m suspecting the z offsets are wrong, so I’m gonna look at that next.

Just to be sure about that:

1 - The routerchuck(without bit) should be all the way down, flush with the bottom of the sled. Does the length of the spindlechuck has any say in this? Since I have a 600W spindle, it’s much longer than on the Dewalt.

2 - The offset is the measured distance in height between the top side of the belt at the arm(A), and the top side of the belt at the anchor(B)

3 - Z offset = (Distance from ground to B) minus ( Distance from ground to A)

What angle they are, or what level they are compared to the height at the arms, have nothing to say for the math in this case?

I also noticed a little dip on the sled at the start of changes in direction, so I’ll try to see if I can get it more slippery.

Tore Westre wrote:

Not really. They all seem pretty fine to me, but I’m suspecting the z offsets
are wrong, so I’m gonna look at that next. Just to be sure; The offset should
be the measured distance in height between the top side of the belt at the
arm, and the top side of the belt at the anchor?

correct, and this includes the wasteboard and workpiece

(you can also measure from the bottom of the belt end to the bottom of the
anchor if that’s easier)

What angle they are, or what level they are compared to the height at the arms, have nothing to say for the math in this case?

what level they are compared to the height of the arms is what the Z offset is
all about.

if you get too close to the anchor with the anchor below the arm, the arm will
flex down and cause some grief (this is why some of us advocate for anchors that
are close to the height of the arms, as long as you can keep the anchors solid
enough)

David Lang

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