1. Report on construction of LP2 spaceframe endplate
LCTPC wp137 Peterson

2. inner endplate, outer plate, strut components
Delivered:
Endplate components:
inner endplate, outer plate, strut components
Screws to mount the strut mounts
Jig plate and alignment brackets
Granite table for assembly and measurements
Measuring tools
Current activity:
Measuring precision hole locations
Setting up for assembly, preliminary assembly
Determining what other parts are needed
LCTPC wp137 Peterson

3. in-row height brackets
height is dialed in
to ±25μm
outer height brackets
alignment brackets
x,y, z rotation
height is set to ±25μm
Height of mullion at center
can be 25μm above the
jig plate. Hold-down is needed.
There is significant (1mm)
bowing without the
in-row height brackets.
Although the screws for the
alignment brackets to the
outer plate drop right in,
there is some tension
placed on the outer plate.
jig plate is flat to ±25μm
strut mount
LCTPC wp137 Peterson

4. Require hold-downs for the mullions as stated on previous page.
Comments:
Require hold-downs for the mullions as stated on previous page.
Screws to attach the strut mounts to the inner plate are
too long by about 1 thread. Next shorter available is too short.
It is risky to tap deeper. Shortening the aluminum screws is painful.
Measurements of precision holes with calipers is repeatable with σ=18μm.
In the last 2 months, there may have been motion of the holes
at the level of σ=20μ, but it is difficult to tell.
LCTPC wp137 Peterson