Sienci Labs LongMill MK2, Assembly Manual

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At this point the right side of your machine will be fully secure. When mounting the left side, we’ll want to
ensure it’s mounted parallel to the right side and also that the back feet are aligned to each other. You can see in
the diagram below why mounting the rails both parallel and in-line is important to ensure the CNC isn’t overly
stressed and also cuts how you expect it to.
Checking for ‘squareness’ can happen many different ways depending on your tools at hand. For example, if your
right side was attached 90° to your table front, then make another 90° mark for the left side to reference using a
straight edge and a carpenter’s square. If you have a friend to help you, the steel end feet also have a small notch
built-in that can allow you to run a measuring tape under the X-rail from the top left to bottom right foot and
top right to bottom left foot. Adjust the left side until these two measurements are equal and that’ll ensure your
machine is mounted square.
A third option is to use the ‘XY Squaring’ tool that’s built into gSender. This tool is probably too fancy for most
people but it’s one of the most accurate ways to check the squaring on your machine. You can read how to use it
here if you’re interested and then come back to continue assembling once you’re done:
https://resources.sienci.
com/view/gs-additional-features/#xy-squaring