A Set Of Calipers Is A Must For Fine-Tuning Your Woodworking Projects. You Can Even Get Digital Calipers Now That Leave No Guesswork As To Whether You Were Inside Or Outside The Line. Of Course, The Metal Ones Are Always Recommended Over Those Made Of Plastic, Even Though The Plastic Ones Are Cheaper.

Calipers Have A Double “F” Appearance. To One Side Is A Large “F”, Used To Measure The Outside Of An Object. To The Other Side Will Be A Smaller “F”, Used To Measure The Inside Of Openings. You Loosen The Screw To Move The Lower “Lip” Of The Caliper, And then Tighten The Screw Into Place When You Have The Caliper Placed Correctly.
You’ll Use the inside Calipers to Measure Slot Diameters, Hole Diameters, And Dado Widths, Among Other Things. There Is Also A Depth Gauge In The End Of Calipers That Will Allow You To Measure The Depth Of Slots And Holes. 

You Just Rest The End Of The Caliper On The Edge Of The Hole And Twist The Thumbscrew Until The Probe Reaches The Bottom Of The Hole. Then, You Can Take Your Reading. If You Need To Measure The Exact Thickness Of Something Attached To A Flat Surface, You Can Use The Calipers To Determine The Thickness By Placing The Butt Of The Caliper End Against The Flat Surface, And Use The Inside Caliper Lip That’s Closest To Your Hand To Record The Surface Of The Item You’re Measuring. The Distance from the Backside of That Caliper Lip to the End of the Caliper Is the Thickness of the Piece You’re Measuring.

While Calipers Will Measure Up To 1/1000ths Of An Inch, You Won’t Need That Kind Of Tight Tolerance. Remember That Wood Is An Organic Material, It Expands And Contracts With The Relative Humidity And With Temperature Fluctuations Trimming Everything To 1/1000ths Tolerance Will Not Leave The Piece Enough Room To Breathe.

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