Article - Chain and Sprocket Wear Gauge
Chain Wear Gauge For Industrial Roller Chains and Leaf Chains.
Author - Tony Voiklis Power Transmission Specialist
The chain roller
articulates as it enters and exists the sprocket valley thus the chain pin and
the inner bush wear, this is known as link joint wear. See diagram Figure 13
Link joint wear produces an elongation to the chain length, the maximum is 3%. (Refer to Section 9 for Wear Elongation)
Pin and Bush wear also
known as Link Joint Wear – Figure 13.
Proper chain lubrication is essential
considerably increasing service life and reducing wear between the chain pin
and bush. Lubrication also reduces chain breakages thus reducing “total cost of
ownership”. Refer to Section 6 for Chain Lubrication and Diagram Figure 11).
industrial chain manufacturers’ and CBC provide an easy to read and use “Wear
Gauge Ruler”. This simple tool facilitates measurement checks for excessive
chain wear. The chain “Wear Gauge Ruler” can be used on all industrial roller
chain and leaf chains. This Wear Gauge Ruler has already considered and includes
the 3% elongation formulae measurement for each industrial roller and
CBC Chain Wear Gauge
Ruler for Industrial Roller and Leaf Chains (Already considered the 3%
elongation formulae). – Figure 15.
measure and identify your chain pitch (See diagram Figure 14) and then apply the
CBC “Wear Gauge Ruler” over the recommended chain pitches/links for your chain
pitch, as given and illustrated on the wear ruler. On this wear gauge ruler
there is a starting point and a finish point which is based upon your chain
Identify and Measure
Chain Pitch (Centre of pins, in inches) – Figure 14.
Roller and Leaf chains:
- P1 isfor chain pitch ½”, ¾”, 1”, 1 ½”, 2”
- P2 is for chain pitch 1 ¾”
- P3 is for chain pitch 5/8”, 1 ¼”, 2 ½”
must be measured when tight (preloaded). Place the appropriate “P”
starting point over one of the chains centre pins and hold the wear ruler in
place. Once your adjacent chain centre pin has come in contact with the
corresponding illustrated finish “P” point marker, it’s time to replace
the chain to prevent any accelerated damage to your sprockets and drive setup.
Note:- Your chain has lengthened/elongated and has reached the 3% elongation
limit set by manufacturers.
a short instructional video on how to use the, CBC Chain Wear Gauge Ruler - Click Below:
a more mathematical method of measuring chain elongation - Refer to Section 10.
can Click here for further information on “Roller Chain & Sprocket
Drives Basic Design Installation & Maintenance”.
CBC for further information regarding any chain performance issue, design or
selection issues. Click here for Chain Trouble Shooting Hints and Chain Failures &
principles above can be applied to any roller chain manufacturer. Some
manufacturers undertake varying heat treatment and manufacturing techniques
that affect the tensile strength or precision of the chain drive and therefore
can provide extended life.
present ratings, published by IWIS Chain (Germany) makes this brand the premium
option considering tensile strength, longevity and performance.
* Warning Safety *
Please turn off the power supply and any other power
sources before starting work onto the conveyor or machine/equipment, lock the
power sources. Always wear the protective clothes and protective equipment such
as safety boots, safety glasses, safety hat, gloves etc.