feeler gauge

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PRESENTED BY :- SALLAN KHAN

FEELER GAUGE

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► A feeler gauge is a tool used to measure gap widths. Feeler gauges are mostly used in engineering to measure the clearance between two parts.

► They consist of a number of small lengths of steel of different thicknesses with measurements marked on each piece.

► They are flexible enough that, even if they are all on the same hinge, several can be stacked together to gauge intermediate values.

► It is common to have two sets for imperial units (typically measured in thousandths of an inch) and metric (typically measured in hundredths of a millimeter) measurements.

► The lengths of steel are sometimes called leaves or blades, although they have no sharp edge.

FEELER GAUGE

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FEELER GAUGE

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INSCRIBE MEASUREMENTLOCKING DEVICE

TEPERED STEEL LEAVES OR BLADE

CASE

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TYPE OF FEELER GAUGE

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TAPERED STRAIGHT

IMPERIAL FEELER

METRIC FEELER

GO NO GO

OFFSETMETRIC

ANDIMPERRIAL

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► Straight leaves may also be referred to as parallel leaves. The sides are parallel all the way from the locking screw to the tip. 

► The leaves have smooth rounded edges for comfort and safety when handling.

STRAIGHT LEAF FEELER GAUGE

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TAPERED LEAF FEELER GAUGE

► Tapered leaves gradually narrow towards the tip. They tend to be shorter than straight leaves. 

► The leaves have smooth rounded edges for comfort and safety when handling

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GO NOGO FEELER GAUGE► A Go NoGo feeler gauge is different to a regular feeler gauge as it

differentiates between a thick base and a thinner tip.► The thinner end of the gauge is able to 'go' into the gap and the thicker body

will not - 'no go'.

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IMPERIAL FEELER GAUGE► An imperial gauge gives measurements in thousandths of an

inch

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METRIC FEELER GAUGE

► A metric gauge gives measurements in hundredths of a millimeter.

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COMBINED IMPERIAL AND METRIC FEELER GAUGE► Some feeler gauges combine both imperial and metric measurements. ► The measurements are often found on separate leaves at alternate ends of the

tool. They can sometimes be found on the reverse side of the same leaf.

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OFFSET BLADES► Offset blades are bent toward the tip for easier access in most motor vehicle

applications and work in restrictive areas

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HOW TO USE FEELER GAUGE

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INSERT FEELER GAUGE► Firstly rotate the inner or outer ring a few times, making sure that both

bearing rings and the roller are aligned in respect to each other. ► Insert the feeler gauge as shown, between bearings and casing.

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MOVE BLADE BACK AND FORTH► Move the blade back and forth until it can be inserted to the middle of the roller. ► Check the bearing clearance against specification before mounting

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TAKE ANOTHER MEASUREMENT ► Take another feeler gauge measurement after mounting the bearing onto

the shaft. There may be variances between the two measurements.

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TAKE ADDITIONAL READINGS► To find the 'true' bearing clearance, take a further 3 feeler gauge readings at

locations: a (9 o'clock), b (3 o'clock) and c (12 o'clock) as shown. 

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CARE AND MAINTENANCE FEELER GAUGE

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► Feeler gauges should be cleaned with an oily cloth before storage to prevent rust. 

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► Immediately after use, close fanned out feeler gauge blades.► This should be done by grouping smaller blades against the consecutively

larger sizes for support.► This will prevent the thinner blades bending when they are closed into the

case. 

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► Immediately after use, close fanned out feeler gauge blades. This should be done by grouping smaller blades against the consecutively larger sizes for support. 

► This will prevent the thinner blades bending when they are closed into the case