Protractor Angle

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How do I measure angles upto 1 second accuracy? Which Mechanical device is suitable for use in Mech. Workshop?

I want to know which Mechanical device is best suited for measuring taper angles etc. with least count upto 1 second? I am aware of bevel protractor, angle gages etc. I want to know better devices, which are cheap.

You'll have to give us a better idea of what you're trying to do. An angular error of 1 second of arc corresponds to a deflection of 5 microns over a length of one metre. It's difficult just making things smooth to 5 microns in a workshop, so any angle you measure will probably have an error in excess of 1 second anyway.

I doubt any solution we can provide would fall under most definitions of "cheap".

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Oli Tools RS SX09 Digital Angle Finder 7 Inch Protractor 200mm Stainless Steel
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New Protractor Angle Finder Measure Ruler 180 Degree 25cm Gauge Inch Metric T3X5
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Gemred 82412 Backlight Digital Level Box Protractor Angle Finder Level Gauge Bev
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Stainless Steel 180 Rotary Protractor Angle Finder Rule Measure Tools 15cm
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Angle ruler protractor stainless steel ruler 180 degree squarewoodworking tool
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Gen 3 Angle Cube Rechargeable IP54 Digital Level Inclinomer w Backlit iGaging
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Stainless Steel 180 Protractor Round Rotary Angle Rule Finder Arm Ruler
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125 GemRed Digital Goniometer Protractor Angle Finder Ruler Stainless GR300
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TLL 90S Super High 0005 Precision Laser Level LCD Display Angle Meter Dual Axis
TLL 90S Super High 0005 Precision Laser Level LCD Display Angle Meter Dual Axis
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90x150mm Round Head 0 180 Degree Protractor Ruler Angle Finder Measure Tool d6fc
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Angle Ruler Multi functional Gauge Measuring Inclinometer Tool 0 320 Degrees
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Ruler Protractor Angle Finder Articulating Arm Fold Measuring 180 Degree Gauge
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Angle Ruler Round Head Rotary Protractor Adjustable Universal Measuring Tool
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Durable Digital Inclinometer Spirit Level Protractor Angle Gauge Meter Bevel
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90 Right Angle Horizon Laser Guide Line Projection Square Level Measure Tool
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Fowler Protractor for checking angles
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Sliding LCD Digital T Bevel Protractor Angle Finder 8 in Measuring Layout Tool
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LOT OF 10 PLASTIC PROTRACTOR ANGLE RULER 180 DEGREES NEW OLD STOCK PORTUGAL
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Digital Angle Finder  Accurate Plastic Protractor Ruler Jobsite Contractor Work
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GemRed 82305 Digital Angle Finder 200mm 7 Inch Plastic Ruler New
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WESTWARD Angle Finder90 deg3 1 2 inBlue 30PA69 Blue
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Digital Inclinometer 0 360 Angle Triangle ruler Electronic Protractor Aluminum
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Digital Inclinometer 0 360Electronic Protractor Angle Gauge Magnets Base I4X3
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0 360 LCD Digital Protractor Inclinometer Angle Meter Spirit Level Finder
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