Comparator
Charts and Screens
ALL
CHARTS AND SCREENS FEATURE THE SEALED IMAGE PROCESS
The
Sealed-image process was developed to give maximum life to our
precision charts and screens. A thin sheet of vinyl plastic is laminated
over the artwork, thereby protecting the image from wearing off due to
use or cleaning.
The lines on charts are made accurate to their center unless otherwise
stated on the chart. Our basic line width is .004" to .005"
(.1-.12mm).
Glass screens are used for new or replacement screens for optical comparators.
The image is centered to the OD of the glass to .005". Glass screens
are available only for 14", 16", 24" and 30" S-T Industries,
Inc./SCHERR-TUMICO optical comparators. Glass screens are recommended
when the artwork pattern will be used for all applications.
Plastic overlay charts are recommended when patterns will be changed frequently.
Plastic charts are available in any diameter up to 30" (760 mm).
The plastic material is dimensionally stable, non-flammable and resistant
to oil. To avoid distortion, plastic overlay charts should not be stored
above 140 Deg F - (60 Deg C).
Cleaning - Clean Sealed Image charts and screens with glass cleaner, soap
and water or isopropanol using a soft cotton cloth. Avoid harsh rubbing.
Do not use paper towels or course cloths and do not use acetone, benzene,
lacquer thinner or other strong chemicals as they will damage the surface.
To order glass and plastic charts, use tgis part number format:
Example:
20X Radius/Grid Glass Screen for 14" Optical Comparator = 74-0031-1425
IMPORTANT
- When ordering glass replacement screens, please include the model number
of your optical comparator.
SPECIAL ARTWORK - Custom artwork is available on request. We can
combine standard patterns or produce custom artwork scaled from your drawings.
NIST CERTIFICATIONS - Accuracy certifications can be provided at
an additional charge. Please request this at the time your order is placed.
|
