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Ordering Process

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Guidelines

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The following fixture design standards are currently in place at GSC/SP, and are the guidelines that we follow if our customer has not established their own set of design standards. These standards always are subject to change. We will gladly work with you to establish custom design standards that are tailored exactly to your needs.

Material:

A variety of ESD and non-ESD materials with or without optical sensitivity can be used if you desire.

Stiffener Bars:

¼�? x ½�? double-channeled aluminum, custom extruded.

Located on all 4 sides of the fixture.

PCB Holddowns:

All holddowns are spring-loaded and assembled from the top side.

Type:

#0

Spacing:

3" - 5" as space permits.

Component Holddowns:

All holddowns are spring-loaded, and assembled from the top side.

Type:

CH-series holddowns

Spacing:

Where applicable

Fixture Width/Length:

Varies with every application, however standardizing these dimensions can decrease your process setup and increase throughput.

OverArm Bars:

Utilized if determined necessary by SP Sales & Engineering tech staff.
Standard design (with plungers) is fully adjustable in both "X" and "Y" axes.

Options include the following:

  • Hinged or Detachable
  • Plungers or Pressure pads
  • Custom

Standoffs:

Used where overarm bars are not desired.

(a less effective solution, not usually recommended)

Can also be used in conjunction with OverArm bars for very large PCB's.

Edge Step:

Lip thickness to be .062".

Step width to be .250".

Edge step to be on all 4 sides.

Bottom of PCB to be coplanar with bottom of edge step.

Bottom Bevel:

30 degree knife-edge surrounding bottom side through-pockets.

45 degrees only when necessary to avoid breaking through topside walls and floor.

Floor Thickness:

Bottom side up design.

PCB should set in fixture as low as possible.

Floor thickness .075"-.100" preffered in most cases. This is dependant upon the total surface area of the floor.

Minimum .050�? floor in isolated areas not to exceed 2" x 2" square.

Wall Thickness:

Through-pocket wall thickness to be .050" minimum, but thicker is always better.

Clearances:

A clearance of .015�? on each side of the PCB pocket should be relieved for thermal expansion.

A clearance of .010" is added beyond the profile of the Surface Mount component. (depth of pocket)

If a connector overhangs the edge of the PCB, pocket relief will span .250" beyond the edges of the connector, and relief depth will be the same as the PCB pocket.

Finger Pockets:

Standard on all fixtures for ease of PCB removal. Depth is .050" - .100" below PCB pocket.

Part Numbering:

All fixtures will be engraved with GSC/SP's phone number, GSC/SP 's program number (for ease of re-ordering), and customer board number / name.

Final Approval:

When the CAD design has been completed, design drawings will be sent to you via email for final approval. GSC/SP designs are provided in pdf format, while customer designs can be provided in dxf or dwg formats if you desire.

It is extremely important that you approve the final design as quickly as possible in order to meet your deadline. Approval delays can result in manufacturing delays, which can ultimately threaten your delivery deadline.

Approval is accomplished by emailing back the approved drawing for our records with the consent of the engineer responsible.

Final drawings will include all pocket depths, the overarm bar location, the number of plungers per overarm bar, edge step configuration and board data overlaid (if available).

Lead Times:

5 business days.

1 - 3 business day turns are available.

(Purchase order required.)

Shipping:

Per customer requirements. (FOB Garland, TX)

(Account number for your preferred carrier needed.)

Other Notes:

GSC/SP will never discard or overwrite old programs due to PCB rev changes.

These standards apply only to wave solder fixtures.

All standards can be modified per customer requirements.

Adjustable Fixtures