How Square is Square

[JonAdkins]

Hello,

I've just completed the 5th step in the build, Installing the Top Support Plate.

I had gotten the extrusion towers completely square to the base during the previous step, however, now that I've put the Top Support Plate on I'm finding that on two of the towers I'm about ~.75mm out of square along 24".

The Towers are dead level across the Top Support, but they're this tiny bit out on the bottom. I've taken it all apart and re-installed three times now with similar results each time.

The heights of the idler mounts are all the same, although I have noticed that on either side there can be ~1mm of variance meaning that the cut yardstick fits perfectly on one side, but on the other it can be a bit tight, I'm just assuming that it's a slight variance as a result of the CNC process.

I don't yet know what sort of tolerances are acceptable and can be corrected out with with software which is why I'm asking this question.

Thanks in advance,

Jon

[Toyguy]

Did you check flatness/straightness of the extrusions? You should be able to square it up all the way. Did you check the alignment of the notches on the top and bottom plate as the Guide instructs you to, including rotating them to find the best possible match? That can make a difference.

[JonAdkins]

Did you check flatness/straightness of the extrusions? You should be able to square it up all the way. Did you check the alignment of the notches on the top and bottom plate as the Guide instructs you to, including rotating them to find the best possible match? That can make a difference.

Thanks for the response Toyguy.

All of my extrusions are perfectly straight and I've followed the instructions to the letter. I think that the extrusions are likely moving when I put the top-plate on as it's a really tight fit and they essentially become 30" levers.

I suppose I'll just take it apart again and be very, very gentle when I go to put the top plate on. Hopefully 4th time's a charm =)

-jon