YASKAWA SGLGW User Manual page 39

2 Installation
2.2.3 SGLTW and SGLTM Linear Servomotors (T-type Iron Core)
3.
4.
5.
Note: To ensure your safety, install the moving coil before installing second and subsequent
2-16
After removing the spacer fixing bolts from the side of the already
installed magnetic way yoke, firmly hold the other magnetic way yoke
onto the positioning step, while firmly tightening the bolts. Make sure
that the magnetic way yokes do not slip into the path of the moving coil. 
Unscrew the rest of the spacer fixing bolts to remove the spacer. Check
where the spacer was fixed to see if there are any mounting holes. If
there are, insert bolts into them and tighten the bolts.
When joining magnetic ways together, place the second magnetic way
temporarily in line with and at least 30 mm apart from the first magnetic
way. Next, while pushing the second magnetic way against the first
magnetic way, secure it with bolts. Keep fingers clear to prevent them
from being jammed between the magnetic ways due to the magnetic
attraction pulling the magnetic ways together. 

Follow the same procedure as in steps 1 to 4 to install subsequent
magnetic ways.
magnetic ways. For details, refer to (2) Moving Coil Installation.
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Magnetic attraction