Once you hit bottom, read the dial or LCD screen and record the measurement. By placing the machined end of the caliper against the rim of the hole or area you want to get a depth reading on, you can open the jaws until bottoming out the depth gauge. You use thisĮxtended gauge to make depth measurements. Getting Depth Measurements with CalipersĬalipers include a depth gauge that extends at the very end of the tool as you open the jaws. Similar to how you can get off-kilter with an outside measurement, take special care that you are perfectly square to the material when taking an inside measurement. Once you have the smaller jaws inside, open up the caliper until they make contact with the inside of the material and won’t extend further. This time, close the jaws so that they are small enough to get inside whatever you are measuring. Take a measurement in much the same manner as you did with the outside measurement. Manufacturers have placed these jaws precisely so that the outside distance lines up exactly with the measurement between the larger main jaws. You use these smaller jaws to make inside measurements. On the backside of most calipers, you can find “reverse” jaws. Even a small amount of grease or dirt throws off your accuracy. You also want to make sure nothing gets between the jaws of the caliper and the material. If not, you actually end up taking an “oval” measurement. For example, if you measure a pipe, the calipers need to be perfectly perpendicular to the length of the pipe. One thing you need to take into account involves the angle of the calipers to the measurement you take. All you need to do after that is read the measurement on the dial or LCD screen. You want to slide the jaws until they firmly contact the workpiece, however, don’t feel the need to try and apply excessive pressure. You simply slide open the jaws and close them again around the object being measured. The easiest, most direct measurement you can make with calipers involves taking an outside measurement. Inside Depth Step Outside Using Calipers to Make Outside Measurements The only way to know is to measure it with calipers. Advanced woodworkers know every sheet of plywood is of a different thickness. Intermediate woodworkers know that 3/4” is actually 23/32”. Then they will drop the plywood in, and it does not fit because plywood is not the dimension it claims to be. New woodworkers will make their first dado for 3/4” plywood 3/4” wide. You can even measure a small sphere with them. Calipers are great when you need to measure tricky objects like a pipe inside or outside. Another use is to measure how thick my board is to know if I have planed it thin enough. I also measure the depth of holes I am drilling. I use my calipers as precision measuring tools when measuring drill bits to see what diameter they are if they are not in an index. You can hold calipers in one of four positions, and each one takes the exact measurement: outside, inside, depth, and step (see photos below). Many highly rated models from Amazon are available for less than $25, but my favorite set is iGaging. You don’t need the costly models for woodworking purposes. The digital has memory recall functions and can show both metric and imperial measurements. All three types are accurate to 0.001-inch. Once you go digital, you will never go back, especially when you get older and your eyesight worsens. ![]() When buying a new set, I recommend you go digital. The digital also measure metric with the push of a button The other calipers measure down to 0.001″. The Nylon calipers measure fractions to 1/64″ but only measure decimals to 0.01″. Available in 19 sizes. Each stop supplied with an Allen wrench.Nylon calipers, dial calipers, and digital calipers are popular with woodworkers. ![]() For example, a 5.5mm drill can be used with a 6mm drill stop. Bits can be fitted with a drill stop with up to 0.5mm difference in size. The window in the side gives the operator an excellent view of the drilling process and provides clearance for chips. As the large resin body contacts the work surface, it will not cause damage. As soon as the depth stop touches the work surface, it stops spinning to let you know you have reached your desired depth. When set, these stops prevent further drilling once the desired depth is reached. Stops can be attached to any twist, brad point or auger bit from 3mm to 30mm via a supplied Allen screw. These drill bit depth stops allow complete and precise depth control when drilling with hand drills or braces. Drill Stopper made by Star M, a manufacturer of high-quality boring bits based in Miki, Japan.
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