Scroll Base Specifications

Scroll Base (Critical Points):

Part #	Component	Material Used	Mfg. Process	Qty.	Production Rate	Manufacturing Cost $ / Piece
12	Scroll Base	Black Plastic	Injection Molding	1	16 at a time	$ 0.070

Scroll Base: This is a small plastic part to which the Scroll Shaft is attached. The Scroll Base attached to the Base via 2 snap points. This part is made by an injection molding process from black PVC plastic at a rate of 16 pieces at a time. This part is placed into the Base by the second operator in the subassembly workstation.

Critical Assembly Points:

2 Snap points for the Scroll Shaft: The Scroll wheel assembly is attached to the Scroll Base at 2 separate points that serve as bushings. It is critical that during assembly that neither one of the fragile snap points breaks off and that the shaft is able to rotate freely once assembled while at the same time stay in its location without coming loose.

Geometric Specifications:
Hole Diameter:
Upper Specification Limit (USL): 0.080"
Lower Specification Limit (LSL): 0.074"

Opening:
Upper Specification Limit (USL): 0.0515"
Lower Specification Limit (LSL): 0.0485"

2 Pins for attachment to the Base: The Scroll Base & Scroll Wheel assembly is attached to the Base at 2 separate points by means of 2 pins that portrude from the Scroll Base. It is critical that during assembly neither one of the pins breaks off and that the scroll base is able to rotate freely once assembled.

Geometric Specifications:
Pin Diameter (For Both Pins):
Upper Specification Limit (USL): 0.088"
Lower Specification Limit (LSL): 0.076"

Additional Quality Issues

The following production issues are associated with non-conforming covers:

Short shot,
Poor weld line,
Sink spots,
Mold flashing,
Warpage.

The following production issues are non-conformities on the cover:

Bubbles,
Burn spot,
Surface imperfections,
Black streaking,
Part sticking in the mold.

IMPORTANT !!!The Scroll Base & The Scroll Shaft are made on the same injection molding machine simultaneously. The Scroll Shaft goes to the machine where the SCROLL WHEEL is made. The SCROLL SHAFT is placed in the machine and rubber SCROLL WHEEL is molded around it.

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