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Here is the completed LEGO Construction Level
prototype. At the top
you will see the Laser Pointer in a vee-block 'bedding' gripped by small gears, all
attached to a large table. The table has the XY Axes and their level sensors (marked
by green blocks) attached. So, down to that point it is a solid assembly with no
looseness except in the rotating table. |
| Beneath that solid assembly there are the XZ
and YZ planes, which have pivot points and linkages and in them there is
plenty of slop. That issue will be addressed in the next page; but for now,
you need to know that inaccuracies in those linkages will always be corrected by the level
sensors. |
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Here, on a kitchen-stool, in full
operation, is the LEGO Construction Level. See the red line. See how a
carpenter can check if the floor is level by simply measuring down from that red line!! |
You press the run button and the following
things happen: On both axes leveling motors run to center bubbles in spirit levels,
as detected by light sensors. As each bubble is centered its motor stops. When
the platform reaches level condition there is a four second delay and the laser head
begins to rotate, painting a red line all around the setup area. After 45 or so
revolutions the head stops spinning. After a brief delay the level adjustment motors
run continuously for two seconds to drive the platform out of level, ready for
the next demonstration run.
But how do you handle 'slop'?
For that, read on ...!!
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