Review on 📏 CGOLDENWALL Adjustable Measuring Tool for Indicator Measurement by Steven Lane

Excellent for measuring large pitch circle radii. I've used it on a couple dozen parts where I needed to measure something that wouldn't work for anything else (except CMM). I've also compared it to traditional diameter measurements on several parts where I've been able to get this type of reading and got a good agreement. You need a known straight surface (e.g. parallel or straight edge) to set the zero point and you need to position the indicator perpendicular to it. If you use it frequently, you can 3D print a template to set the squareness. Make sure you leave enough travel on the display when you reset it. It is important to consider where to tighten the set screw on the indicator! When measuring the inside radius, you need to zero the piston for most of the stroke. The outside radius requires the piston to expand when zeroing. Measuring is a bit cumbersome. You need to look for two things: get the span of the bar at the radius you want to measure and position the indicator perpendicular to the surface. If you rotate the whole thing at the cylinder's outside radius without tipping over, you'll get infinite radius values when the rod is parallel to the cylinder's axis. The minimum radius you read tells you when the rod is perpendicular to the axis of the cylinder. At this point, rock the indicator back and forth and spin on a pair of balls on the strip. At this point you want to find the largest radius; This is the actual measurement. Yes, it's hard to get the measurement! However, I found it very reproducible and it works where nothing else works! I had a few parts with matching inside and outside radii and the readings I got were consistent for the inside and outside radius. You need to read the chart and choose the right rod; Otherwise your accuracy will deteriorate. Follow the instructions to set up which bar you're using; that's easy.