21st Century’s Impressive New Concentricity Gauge
21st Century Shooting’s all-new Concentricity Gauge looks like a winner. The cartridge case rides on four spinning rollers that allow smooth turning movement with low drag. These rollers are far superior to a set of V-Block supports, or even some ball-type supports.
The amount of eccentricity (run-out) is measured with a high-quality horizontal dial test indicator. In this application, a horizontal indicator works better than the typical vertical dial indicator with spring-loaded shaft used in most other concentricity gauges. We think that, with 21st Century’s new Concentricity Gauge, you can measure cases faster, with less effort, and greater repeatability. In addition, this device can measure the INSIDE of the case neck, not just the OUTSIDE.
Overall, this is a very impressive new tool that is unquestionably superior to many other Concentricity Gauges on the market. Given the capabilities of this device, the price is reasonable: $169.00 including Horizontal Indicator. The Gauge by itself costs $125.00, while the Indicator alone sells for $59.00.
Click Photos below to view larger Images
Product tip from EdLongrange. We welcome reader submissions.Why the New 21st Century Concentricity Gauge Works So Well
21st Century explains the advantages of its new design: “At 21st Century Shooting, our goal to modernize an industry that has seen little change over the years. The new concentricity gauge is a perfect example. Most conventional concentricity gauges use what is called a height indicator gauge (Dial Indicator with vertical shaft). Although economical, this type of gauge was not intended for the purpose of measuring rotating diameters. The vertical-style indicator can produce inaccuracies due to indicator rod flex and bounce.Our new Concentricity Gauge uses a horizontal dial test indicator. This type of gauge was designed specifically for checking rotating diameters and in fact is exactly the type of gauge used in the machining industry for decades to measure run out — the very thing that we as hand loaders are striving to minimize or eliminate.
Additionally, our new gauge uses Stainless Steel turning rollers as opposed to fixed bearings or V-block style case supports. You will especially appreciate the roller supports that glide on linear guide-ways. Plus, with a simple push of a button you can adjust the case support base width. No tools are needed to move the base on the built-in guide-ways.”
Similar Posts:
- New Wheel-Drive Concentricity Gauge from Accuracy One
- Cool Tools for the Reloading Room — Look What UPS Brought
- Redding Offers New Slant-Bed Concentricity Checker
- H&H Concentricity Gauge and Bullet Straightener
- Bill Goad Concentricity Gauge Works by Impact
Tags: 21st Century, Concentricity, Dial Indicator, Eccentricity, Reloading, Run-Out
At least in theory fixed supports are superior to roller bearings. Everything that turns or moves adds some tolerances to your measuring output.
EDITOR: Problem with fixed v-blocks, as on the RCBS Casemaster, is that the Vs have a flat surface that doesn’t match the case taper. You have to push down on the case pretty darn hard to keep it from rocking. There is a lot of drag and this makes it difficult to get repeatable measurement.
Randolph makes an excellent point – this would appear to be an excellent design for convenience, but for best accuracy fixed supports (eg fixed balls) are better.
@EDITOR
Call me a nitpicker, but the fact the RCBS designers didn’t make a good design, doesn’t change my statement.
product looks nice, however it also looks to be over engineered and less precise than comparable products already available on the market.
Over engineered and less precise???
Is that an oxymoron like cheap luxury?
Since I like over engineered American made products, I ordered one. I will post my experience with the 21st Century Concentricity setup soon.
Hi, in case your bullet is not inline, how do you press it to the correct position
I have one and indeed the small roller bearings cause larger rounds to roll off the blocks. Accuracy One gauge is better engineered with larger rollers providing deeper round placement and stability. The roller wheel lacks a handle to spin it and hence you wind up putting too much pressure on the wheel to turn the round causing instability. Also, unlike the Accuracy One the dial does not have a screw that can easily position it up or down…… Danie, as far as your question the only gauge that I use all the time and it corrects run out is H&H gauge, which is hands down the best product on the market and does not have an even close second. As far as Century 21 gauge… its a good concept but needs tweaking…. Accuracy One seems like the fully executed project albeit Expensive.