New Wheel-Drive Concentricity Gauge from Accuracy One
Talented tool-maker Curt Knitt has designed a better mousetrap — a new Concentricity Gauge that makes it easier than ever to get fast, repeatable results when measuring case and bullet run-out (aka “eccentricity”). The breakthrough design feature is the large-diameter wheel which spins the case. With most other concentricity gauges you must rotate the case with your finger(s). Anyone who has tried this knows that it is difficult to get a full, 360° rotation of the case without disturbing the indicator. Typically you can get two-thirds of a rotation or so, but then you have to reposition your finger to complete the rotation. Moving your finger often causes the case to jiggle or move slightly, and more often than not, the dial indicator jumps a bit, interrupting your measurement. Been there, done that.
Drive Wheel Smoothly Spins Cases for Fast, Error-Free Readouts
With the new Accuracy One Concentricity Gauge from CTK Precision, the rubber-rimmed drive wheel has a much larger diameter than any cartridge case (7:1 diameter ratio on magnums). So, when you rotate the drive wheel just a half-turn or so (using knurled knob on the wheel axis), you can easily and smoothly turn the cartridge three (or more) full rotations. The drive wheel maintains a constant, even load on the case, so the case doesn’t wobble and the dial indicator gives a continuous, un-interrupted read-out. What’s more, clever cartridge support design geometry pulls the case back against the rim stop as you engage the drive wheel. This holds the case in position laterally during measurement. Morever, this allows very fast one-handed operation. You don’t have to hold the case down with your fingers while maintaining side force against the case rim stop.
Watch Video Showing Concentricity Gauge Used with Small and Large Cartridges
The Accuracy One Concentricity Gauge works with the full range of cartridges — everything from .22LR to .50 BMG. Adjusting the tool for different-length cases is incredibly easy, because the roller blocks (case supports) are held in place by magnets. You just slide the blocks to the desired position — no tools needed! The indicator stand is also held by magnets so it can slide to any position you want along the case body or bullet. And, the indicator can be moved to the front rail and rotated 90°. This way you can measure on the inside of the case neck.
Does this new design really work? Absolutely — it works brilliantly and it’s FAST. Watch the video and see for yourself. We could do two-rotation (720°) measurements on cases in a third the time it takes to do a one-rotation gauging operation with other tools. And the actual measuring operation can be done one-handed, leaving your free hand to pic up the next case (or bullet) to be measured. And yes, this tool can also measure bullet concentricity — measured from tip, ogive, bearing surface, and/or boatail.
1. Directional Drive Wheel pushes the cartridge or bullet into the stop for accurate, repeatable readings with equal pressure. The replaceable rubber drive ring will not harm cartridges or bullets. 2. Two-position bullet and cartridge stop. 3. Precision ball bearings provide friction-free movement. 4. Heavy steel base with E-coat finish and bolt-on rubber feet. 5. Indicator stand and roller blocks ride in machined slots and are held in place by N42 Neodymium magnets. This allows rapid, smooth, tool-free adjustments. 6. Indicator stand can be place in front OR rear machined slots. This allows for both internal and external measurements. 7. Fine-Adjustment Horizontal Indicator Stand allows very precise indicator angle/load adjustments. 8. Indicator Stand will accept horizontal indicators that are .350″ wide or narrower, and are 1.75″ to 2.25″ from the indicator contact point to the center of the main body. 9. Adjustable mechanical arm stop holds the arm up for one-handed operation. 10. Precision Drive Wheel has a 13:1 ratio for .22 rimfire, 7:1 for magnums, and 3.7:1 for 50BMG. 11. Concentricity Gauge accepts cartridges from .22LR rimfire to .50 BMG. |
The Accuracy One Concentricity Gauge is available from BulletTipping.com. Price for the unit, complete with quality horizontal indicator, is $325.00. Price, without indicator, is $280.00. The initial run of Concentricity Gauges is now in final production. Gauge sets should hit the market in 4 to 6 weeks. To place an advance order, fill out the PDF Order Form, or call (814) 684-5322. To learn more about setting up and using this new tool, read the Concentricity Gauge Instructions, and watch the video above.
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Tags: Concentricity, Concentricity Gauge, CTK Precision, Curt Knitt, Drive Wheel, Eccentricity, John Hoover, Reloading, Rimfire, Run-Out
The “CTK Precision” link does not lead to the products!
Use the: http://www.bullettipping.com/index.html
Happy Safe Shooting!
Tom
Editor: CTK Precision is Curt’s Company. The Concentricity Gauge is marketed through Accuracy One Shooting Supplies. The best link is the first provided in the article:
http://www.bullettipping.com/products_concentricitygauge.html
OH GOD $325!!!! Nice but wouldn’t that buy an old action for a new project,,?
The price is absolutely ridiculous.
It’s nice but I would suspect some roller bearing play from it. IMO, they should have followed Sinclair in that regard(pressed ball bearings).
Also, be careful with terms thrown out here. This gauge measures TIR, which includes MORE than eccentricty.
It will not isolate deviation from a centerline(to show eccentricity specifically).
And that’s fine, TIR is all that matters anyway.
For that price I’d at least like someone attractive to tell me about the thing.
Seriously, cut your price by half and maybe. The drive-wheel unit does look like it works well.
looks like that rubber wheel device is a winner. I’d like to see that offered for my NECO measurement tool. also, the idea of the magnet attachments is a good one, but I can not imagine buying another concentricity tool…
Now that I measure concentricity, what tool do I need to CORRECT it? For that price it should be able to fix runout as easily as it measures it. Rubber wheel is a great idea in form and function.
I had the RCBS gauge, then the Sinclair gauge. Both were doing the job, but very cumbersome to align the bullet and the measuring tool.
This is a fine instrument, and has several advantages: the rubber wheel (which multiplies the rotation to the case), the fact that you don’t have to touch the cartridge and the ease of adjusting the gauge for a case, inside case or bullet concentricity measurement justify the cost in my opinion. And it’s considerably faster than the rcbs or sinclair gauge.
Very happy with it, way superior to what’s on the market. Yes, expensive but it’s a one time investment, this thing is bullet proof.
Do you have any used ones.I would love to haveat one but I can’t come up with 325.00 160 is all my wife will let me do. I’m sorry I’ve don’t think I’ll will ever have one. If you have a reconditioned one I’ve mitever be interested. My number is 608-780-3381
What happens to the concentricity when you jam the bullet. Has anyone checked this after they chamber the round? Check it out