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Changes to Step #21

Edit by Michael Hackney

Edit approved by Michael Hackney

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[title] Aligning the upper assembly
[* icon_caution] Once you have all of the cross member extrusions in place ''be very careful '' when moving the upper assembly around. Alignment and tightening the upper assembly is similar to the base. But since there is only one extrusion between corner brackets, you can tighten both the top and bottom screws afterat the same time during alignment.
[* icon_caution] Once you have all of the cross member extrusions in place ''be very careful '' when moving the upper assembly around. Alignment and tightening the upper assembly is similar to the base. But since there is only one extrusion between corner brackets, you can tighten both the top and bottom screws afterat the same time during alignment.
[* red] Use the same piece of rope or cord you used in ''Step 9'' with the loose loop in one end.
[* red] Wrap the cord around the upper assembly and pass it through the loop. Pull the cord tight and tie off to the cord itself, don't tie it off around the cross member like you did in Step 9.
[* icon_note] The photo shows a simple overhand knot holding the cord tight.
[* red] Move the upper assembly to the flattest smooth surface you can – a granite kitchen counter, smooth Formica™ counter or even a smooth table top work well. Just make sure it is clean (no crumbs!) and flat.
[* red] Push the cross members flat to the table and then tighten the six upper and six lower screws you can reach near the stepper motors.
[* red] Tighten
Then tighten the six screws inside the corner brackets.
[* red] Push the cross members flat to the table and then tighten the six upper and six lower screws you can reach near the stepper motors.
[* red] Tighten
Then tighten the six screws inside the corner brackets.
[* red] Flip the assembly over and tighten the other six screws inside the corner brackets.
[* red] Make sure all twenty-four screws are tight. Lay the upper assembly on a flat surface with the '''XYZ''' labels facing up and test to see if it rocks or tips. If so, you need to loosen ''all of the screws'' and ''repeat this step'' again! So best to work carefully and get it right the first time.

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