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Archive for April 25th, 2011

HBP + Aluminum Build Plate (Re)Alignment

Installing the X Rod Follower required realigning the aluminum sub-plate to get a level build platform. I got a crude initial setting by standing a 3 mm nut on edge under each adjusting bolt, then lowering the platform until it just touched each nut. Doing that procedure again with the height set to 119.5 mm produced these values:

1.6 1.3 1
1.3 1.1 0.9
0.9 0.8 0.7

I removed the silicone wiper to keep the Thermal Core insulation from landing atop it during the probing. A single wipe at the beginning is a Good Thing, but the wiper is just too tall.

The rear left corner seems to be too low by about 0.7 mm, which is a bit more than one turn of the M3×0.5 bolt. Remember: larger numbers = lower platform, so you loosen the bolt to raise the platform. I almost got that right the first time. After doing that:

1.1 0.9 0.8
1 1 0.9
0.9 0.9 0.8

A final quarter-turn got the platform to this happy state:

0.9 0.8 0.9
0.9 0.9 0.9
0.9 0.9 0.9

That’s just the sub-platform at room temperature, but it looks pretty good.  The platform returns to the same position after pushing it down against the springs, so that seem stable enough.

The next step is to run up the temperature and build something.

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