RJG Lynx LS-B-127-125, Product Manual

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Lynx™ Strain Gage Button Sensors LS‑B‑127‑50/125/500/2000 | Product Manual 32 RJG, Inc.
NON‑STANDARD INSTALLATIONS ( continued )
3.
Ejector Pin and Counter‑Bore Clearance
Always use standard ejector pin clearances
when installing cavity pressure sensors under
static ejector pins to prevent damage or
destruction of the pins, sensors, and mold.
Proper ejector pin head and counter‑bore
clearance will allow the static pin to move freely
in the ejector pin bore.
4.
O‑ring Sizing
O‑ring sizes are designated by inside diameter
(ID [
1
at right
]) and cross section (CS [
2
at right
]), usually in inches. A 0.072 X 0.036
O‑ring would have an ID of 0.072” and a CS of
0.036”.
The O‑ring is installed in the ejector pin’s
groove. The groove is measured by diameter
(
3
at right ) and width (
4
at right ). The
diameter is cut to ensure O‑ring stretch of
0–10%. The depth is cut to ensure O‑ring
compression of 20–35%. Ensure the pin end
before O‑Ring groove is 0.030” (0,76 mm [
4
at right ]) MIN for steelsafe.
Contact RJG® for assistance in sizing and
tolerancing O‑rings and installation requirements.
Refer to the table below for RJG recommended,
in‑stock O‑rings.
5.
O‑Ring Installation
Improper O‑ring installation can cause tears
if it is pulled over the sharp ejector pin edge.
Use an installation tool constructed of the same
diameter as the ejector pin, with a tapered end.
The end can be ground, usually by a grinding
wheel, and buffed by a wire wheel to remove
1
2
3
4
5
any burrs. Slide the O‑ring onto the tapered
end of the installation tool, and then slide onto
the end of the static pin. ( Refer to figure below.)
6.
Pin and O‑Ring Bore Installation
Use an O‑ring lubricant to help prevent
damage when inserting the pin into the bore.
Many silicone‑based lubricants can damage
silicone O‑rings. RJG, Inc. recommends P‑80
THIX lubricant from International Products
Corporation (
http://www.ipcol.com/shopexd.
asp?id=31
). Rotate the pin as it is being inserted
to ease installation and limit potential O‑ring
damage.
O‑RING GROOVE SPEC. BORE SPEC. LEAD‑IN
Nominal
Pin Size Material Size
(Metric)
RJG Part # Units Width (4,
above)
Width Tol
(+/‑)
Groove
DIA (3,
above)
DIA Tol
(+/‑)
Bore DIA Bore Tol
(+ Tol, ‑0)
MIN DIA
4,0 mm
Silicone
2,7 x 0,65 85‑6157‑000
inches
0.038 0.003 0.1137 0.0019 0.1575 0.0005 0.167
2,5 mm 1,4 x 0,6 85‑6159‑000 0.032 0.003 0.0667 0.0010 0.0984 0.0005 0.115
4,0 mm 2,7 x 0,65 85‑6157‑000
mm
1,00 0,08 2,888 0,048 4,0 0,012 4,24
2,5 mm 1,4 x 0,6 85‑6159‑000 0,80 0,08 1,695 0,025 2,5 0,012 2,92