Wanted to share with everyone something I've been experimenting with since December of
last year. I received a digital crane scale as a Christmas gift and originally I had planned on making
a arm wrestling type dyno to measure one's pulling forces from various angles but instead I tried
a NEW method for rating grippers. I've attached some pics of the setup below so you can get an idea
of what I've come up with.
A little background first. Ever since I had a RGC device I instantly started trying to think of a better more
efficient and accurate method to accomplish rating grippers without all the manual labor, back aches, fumbling with
a jack to raise the weight up and down, etc. and in the process have a repeatable, accurate method that can be
consistently used by anyone to come to the same conclusions on rating grippers. Well! I have done just that and I've
done numerous tests to get all the bumps out of the method and I can assure you this is by far the most accurate
method I have personally found to date. You never have to lift a weight plate and the speed and accuracy at which you can rate a lot of grippers is stunning! My last test was completed today before I decided to go public with my idea and I can envision this method being the future of rating grippers. Yes! You'll have to shell out the money for a quality dynamometer to perform this method but the cost is well worth it! Today I rated 7 very strong grippers and seen what kind of time I was looking at and I completed the process in under 30 minutes and some of that time was going in the house for a drink. I wanted to video this process today as well but the humidity was overwhelming and I didn't want to put my camera gear at risk to condensation from fogging.
The dynamometer I now use to rate grippers is a Chatillion CCR 440 with an accuracy of +/- 0.2% at full scale. These are classified as crane scales and are very reliable and accurate. I have a Certificate of Calibration with this dyno and it has worked flawlessly! In conjunction with this dyno I use a hand ratchet strap system to ratchet down the gripper handle till they touch and then press the hold function to record the reading. It also has a tare function to zero the meter in certain circumstances which is a bonus for any dyno/scales. I tested and retested this dyno with another certified scale I use to weigh weight plates and they both coincide precisely!
The tests I performed was to take "x" amount of sample grippers (now 20) that was rated the conventional method and compare these findings to the findings of the Digital Dyno Method. Every single sample gripper came out within a pound and less. Only one gripper was at the one pound mark. All the other samples were within ounces. These tests confirmed several things. 1) It verified that my previous method was accurate and apparently done correctly despite others saying my results were always low. 2) results/findings are repeatable in comparison to the current method of too many people
coming up with different ratings for the same gripper.
The purpose of me sharing this information and idea is to hopefully spur others that take accuracy and repeatability
of rating grippers seriously and take the leap and perhaps give this method a try. If we as a community don't take our sport serious and apply science to our standards then no one else will take us serious either.
Lastly, I always cringed when someone would ask me what RGC stood for and I just hated to use the word red neck
when trying to describe a process that was intended to be an accurate method for rating grippers. Just didn't sound right to me! I will now tell others when they ask that I use the DDM (Digital Dyno Method) to rate grippers. Sounds better than
a Red Neck Gripper Calibrator in my view. Before anyone says I'm making fun of or poking at the RGC method, I'm not!!! I'm saying that there is now a better way! RGC is all we've had to work with and we did the best we could. I can't speak for anyone else but I'm always thinking outside the box and I constantly look for ways to improve whatever it is I set out to accomplish. No more back aches for me when I rate grippers! No more dreading to rate a monster gripper because of tossing around a bunch of heavy ass weight plates and hoping that the whole mess doesn't fall over and kill somebody.
Any input or further suggestions is appreciated! I always welcome criticism as long as it's positive in nature
and is intended to make things better. Bring it on!!!
Here's a list of the BIG grippers I rated using the DDM today along with the results in pounds:
GHP 8 = 173.4, GHP 9 = 214.6, AG 5 band = 208.2, Tetting WC = 277.2, Shorty Elite = 196.6, Shorty SE = 218.8
and a Shorty GE = 223.0 Note: Shorty's are a set of grippers I had custom made by Warren Tetting with 3-1/4" handle length instead of the conventional 3-3/4" length. These are perfect no-set grippers BTW!
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