Electroimpact designed and manufactured an Automatic Spar Assembly
Tool (ASAT4) for Boeing's C17 program. ASAT4 is based on the concept of
"in jig" assembly with a vertical yoke assembly machine. This ASAT configuration
was initially implemented for the Boeing 737 and 757 programs. ASAT4 however offers
an unprecedented level of flexibility along with many new features for improved
process speed and control.
ASAT4 consists of a vertical traveling yoke machine which straddles the
spar fixtures. Two fixtures placed end to end form a system approximately 220 feet in
length which is serviced by a single machine. This allows manual operations,
e.g. load and unload, to be performed on one spar while the machine works in the
adjacent cell. Each fixture can accept any of the six C-17 spars. Fixture reconfiguration
between spars is completely automatic. The single three axis yoke machine, the E5000,
travels the full system length. The yoke is simply supported on the side of a rigid
gantry structure. The E5000 has completely redundant tool heads on both legs of the
yoke. This permits drilling and fastener insertion from either side of the spar.
Contact Electroimpact for more information: Sales@electroimpact.com