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SELECTION CONSTRAINTS
VELOCITY LIMITS
Oil bath: Chain speeds should not exceed 2,500 F.P.M.
Standard lube: Chain speeds should not exceed 1,800 F.P.M.
Bone dry: Chain speeds should not exceed 800 F.P.M.
ENVIRONMENT
Temperature: Maximum operating
range of any standard POBCO Snapidle® unit is two hundred degrees F.
For temperatures above two hundred degrees F, use the PSI-HT Series
Snapidle® (Not to exceed 450° F).
Chemicals: Metal
carriers are stainless steel. Screws and pins are zinc plated carbon steel.
Wingnuts are die cast zinc. Bolts are zinc plated carbon steel with nylon
inserts. All stainless steel (300,304) construction is available upon
request.
Environment: In extreme environment (i.e. abrasive
grinder dust, foundries, gypsum facilities, dry glass, etc.) especially in a
lack of lubrication situation, the wear on the carrier will be greatly
enhanced. In the case where the standard POBCO Snapidle® does not
provide adequate life, the PSI-XH Snapidle® series should be
used.
Reversing Drives and Orientation: The POBCO
Snapidle® series has no limitation on the direction of rotation. The
POBCO Snapidle® may be used in any chain drive attitude.
MISALIGNMENT
The
POBCO Snapidle® series can tolerate any misalignment compatible with
a roller chain drive and, in most applications, will allow a roller chain drive
to operate with a larger misalignment. Misalignments in which the plane of one
sprocket is rotated relative to the plane of the second or in which the plane
of one sprocket is moved laterally relative to the other sprocket, or a
combination of the two, can be tolerated.
TENSIONING & IDLING
SYSTEMS
"Traditional" tensioning or idling devised face the
following problems:
1. Too much tension in a drive causes excessive
belt, chain and bearing wear.
2. Too little tension in a drive allows
belt slippage or chain vibration, resulting in loss of power and additional
wear.
3. All traditional idlers should be installed on the slack side of
the drive.
4. Traditional v-belt idlers should be used on the inside of
the belt, which results in a corresponding horsepower
loss
due to the reduced arc of contract.
5.
Idlers used on the outside of a drive should be located approximately 1/3 of
the center distance from the small
sheave, pulley or
sprocket, or the drive will suffer detrimental effects.
6. Chain wrap or
pulley wrap must be 120 degrees of the small sprocket or sheave in order to
have adequate drive life
and in order not to suffer
horsepower loss.
7. Traditional idling sprockets add increased wear to
the drive.
8. The system must be mounted, maintained and
lubricated. |
