Ch 0121 / 22
Step 01.21 — Titanium backers: not now¶
Step 21 of 22 · Chapter 01 — Frame
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Parts: none.
Do: Check the titanium backers are still sealed and labelled for Ch 05. They are not frame parts and fit the gantry's X and Y extrusions, on the face opposite the rail.
Check
Backers bagged, labelled "Ch 05", stored with the C/D/E extrusions. src
What you're looking at
The titanium extrusion backers, still bagged. A backer is a titanium strip bolted to the face opposite a linear rail; it cancels the bimetallic bow of steel rail on aluminium extrusion, see glossary.