Page 49 - New Supercatalog Color.indd

C-48
Gasket Design Tips
Problem Result Suggested Solutions
Projection or "ear"
Notch instead of hole
Avoid hole sizes under 3/32"
diameter. If small hole is for locat-
ing or indexing, change to notch.
Simple perforation
Have the gasket in mind during
early design stages
Most gasket materials are com-
pressible. Many are affected by
humidity changes.
Try standard or commercial
tolerances before concluding that
special accuracy is required.
Most gasket stocks will conform
to mating parts without pre-shap-
ing. Be sure radii, chamfers, etc.,
are functional, not merely copied
from metal members.
Die-cut dovetailed joint
Bolt holes close to edge
Very small bolt holes or
non-circular openings
Tear-away parts with open slots
at attached edges
Thin walls, delicate cross-section
in relation to overall size
Metalworking tolerances applied
to gasket thickness, diameters,
length, width, etc.
Transference of fillets, radii, etc.
from mating metal parts to gasket
Large gaskets made in sections
with beveled joints
Causes breakage in stripping
and assembling
Require handpicking…
easy to miss
Slots require handpicking,
costly dies and die
maintenance
High scrap loss; stretching or
distortion in shipment or use.
Restricts choice to high tensile
strength materials
Results in perfectly usable
parts being rejected at incom-
ing inspection. Requires time
and correspondence to reach
agreement on practical limits.
Increases cost of parts and tool-
ing. Delays delivery.
Unless part is molded, such
features mean extra operations
and higher cost
Extra operations to skive or
glue. Difficult to obtain smooth,
even joints without steps or
transverse grooves.
2.000
±.002