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EricMilfeld

Cannon Powerworks Gripper Ratings

25 posts in this topic

Just wanted to give an unsolicited thumbs-up for Matt's calibrations. Tommy brought over over a 154 and a 194 gripper that had been calibrated by Matt tonight and asked me to see what figures I got for them. My numbers were identical. That makes three grippers now that we have cross-calibrated and attained identical readings. For me this is very significant. I have previously calibrated grippers rated by others and discovered their numbers to be inflated usually by five to ten pounds. I've never calibrated a gripper and attained a number higher than someone else. What troubles me is that some of these grippers are probably floating around at contests. I've gone into detail about the method that both Matt and I use for calibrating on the board here several times in the past, but if anyone is calibrating and is unsure about their numbers let me know. Maybe you could cross-calibrate with me or compare your reading with one of Matt's pre-calibrated grippers. I just think it's imperative that contest grippers, in particular, have accurate numbers that can be duplicated by anyone using the proper method of calibrating.

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Eric I really appreciate that you posted this. It is truly unsolicited too; I'm not sure we've barely ever discussed ratings. I think we both have just tried very hard to "get it right".

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Good to hear since I have about 20 or so grippers calibrated by Matt. :)

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I'd be interested in rating one of your guys grippers instantly after you do it. I rated one of Matt's last year and was 3 lbs off but this was also after the gripper was in a choker for quite a long time and lots of use, so maybe it got weakened by this type of use.

I'd be interested in seeing comparisons between many of the more common rating devices. Mighty Joe suggested this a year or more ago but it never got off the ground.

Shoot me a PM if you are interested in cross-rating with my device.

Thanks.

Jedd

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I'd be interested in rating one of your guys grippers instantly after you do it. I rated one of Matt's last year and was 3 lbs off but this was also after the gripper was in a choker for quite a long time and lots of use, so maybe it got weakened by this type of use.

I'd be interested in seeing comparisons between many of the more common rating devices. Mighty Joe suggested this a year or more ago but it never got off the ground.

Shoot me a PM if you are interested in cross-rating with my device.

Thanks.

Jedd

PM sent

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That's good to know. I know I get mine (grippers bought used. I shop and rate with Matt for new ones :) ) rated from someone who has cross rated with many reputable raters. It means alot to trust a number from someone who has double checked their work against proven people before him.

Edited by daniel reinard

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We posted some ratings data we have compiled since June of 2012. This is only ratings of new grippers for orders.

http://cannonpowerworks.com/pages/grip-strength-ratings-data

If you have specific questions about HI/LOW ratings for a given gripper, we can try and answer those and hope to add those values to the chart eventually.

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We posted some ratings data we have compiled since June of 2012. This is only ratings of new grippers for orders.

http://cannonpowerworks.com/pages/grip-strength-ratings-data

If you have specific questions about HI/LOW ratings for a given gripper, we can try and answer those and hope to add those values to the chart eventually.

Numbers=Awesomeness

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We posted some ratings data we have compiled since June of 2012. This is only ratings of new grippers for orders.

http://cannonpowerworks.com/pages/grip-strength-ratings-data

If you have specific questions about HI/LOW ratings for a given gripper, we can try and answer those and hope to add those values to the chart eventually.

Great to see this. Thanks!

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Thanks Matt!

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Already an update to the ratings data! We added columns for the MIN and MAX rating for each individual gripper. You can see there is quite a range in some cases. This helps make the case for getting your actual order rated.



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Already an update to the ratings data! We added columns for the MIN and MAX rating for each individual gripper. You can see there is quite a range in some cases. This helps make the case for getting your actual order rated.

Very nice!

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A Tetting Master rated at 148! Did you by chance put a micrometer on that spring?

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A Tetting Master rated at 148! Did you by chance put a micrometer on that spring?

That's crazy. I have one at 118 that I thought was unusually heavy

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A Tetting Master rated at 148! Did you by chance put a micrometer on that spring?

I wonder this as well

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So IM varies (shocker I know) up to 15#. GHP's up to 10# or so, and Tettings up to 30#. That's a massive spread. What makes them so inconsistent?

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A quick note about our ratings. Due to a generous gift from Mighty Joe, we've switched to a digital hanging scale. Everything that involves the gripper or touches the gripper is still exactly the same. We've done extensive cross-rating between our old and new setup for about a month and the numbers are matching exactly.

There is one improvement that our digital results seem more consistent. On the old setup we might see variation of a pound here or there due to the nature of the weight stack, but on the digital setup we're able to be much more precise and controlled. Keep in mind we're still only measuring "pounds at the close". One data point, same as before.

We have what I would call a "proprietary" setup for the digital scale which was fine-tuned, re-designed, re-worked, and fine-tuned some more to ensure results are consistent with previous CPW ratings. We've got it nailed now and this is an exciting switch for us. You should see quicker turns on rated orders and also more Pre-Rated grippers.

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Two things.

1. That's a very generous donation from Joe that will be great for your back.

2. It may be time to rethink the name "Redneck Gripper Calibration" and instead go with Joe's proposed "Digital Dinamometer Method" in order to lend the sport some more legitimacy in the eyes of new athletes.

If CPW leads by example, the change will be relatively easy for both pros and newcomers to swallow.

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You are always improving Matt. You run a fantastic business. Thank you for all the hard work.

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This was great to read Matt! I am thrilled this is working for you!

It was my pleasure to donate the scale! I knew it would improve your efficiency big time

and at the same time save your back.

Thanks for all you and your wife do for Grip!

MJ

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Glad you were able to get it up and running Matt and glad I could help with the getting it figured out.

- Aaron

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Glad you were able to get it up and running Matt and glad I could help with the getting it figured out.

- Aaron

You were a huge help, Aaron. I really appreciate the discussion and troubleshooting. It made a big difference!

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I wanted to cross-post this here regarding our philosophy about why to get grippers rated and what is possible.

From this thread: http://www.gripboard.com/index.php?showtopic=44893&p=648537

Have noob ish question... Probably been discussed before ... Do grippers rate heavier initially if they are not seasoned before the rating, or are they lighter. Does the difference between a seasoned gripper and an unseasoned gripper vary by brand? If some of you RGC PHd's could get me some knowledge here I'd greatly appreciate it :) Wondering if a 160 cert gripper would rate 160 at the time of the "unseasoned" first close).

I believe Matt does something like 50 chest crushes and then oils the spring before he rates them, so the 160lber is probably a fews pounds harder right out of the package.

Yeah, we put 30+ reps on each gripper (although they are not chest crushes! I would have the biggest chest on earth by now.) We also oil the spring and clean it if necessary. If the gripper is going to lose some strength out of the package, I have found that it happens on literally the first rep. We do 30+ for good measure just to be sure. Really the root of this action is to hope for a repeatable result later as long as the spring is clean and oiled. There is always margin of error in the rating process so this is just one more way to try and curb that (and yet another reason we don't deal in decimals). We've also found that grippers tend to get slightly weaker with lots of use, but not by much, and putting the reps on initially helps some.

The rating service, I feel, is most valuable to categorize grippers like we have done at CPW. That's really the point. You have to understand that we're taking a measurement at a specific point in time and then after that the gripper will never be exactly the same. It could hang on a pegboard and never get closed again, but get harder because it rusted. It could be meticulously maintained but also used excessively and end up a little easier. It could rattle around in your gym bag and have all the knurling knocked off and therefore feel harder. New #3s are generally 148 as far as the average data we have collected. So a new one that goes 160 is definitely harder than average. In terms of your own collection, it will likely continue to fall in line that way as compared to other rated grippers you have. But if you sent it back to us, would we get the exact same rating? Probably not, because it's not the exact same gripper we sent you (which is where the Rate and Return service comes in). But even if you never have it rated again, the initial information that it was "160" will have it usefully filling that spot in your collection versus other rated grippers. This is also why CPW recommends that you get ratings in increments of 5 pounds. We feel this helps ensure that you have actual steps you can feel in your training that will remain with use of the gripper and also with various states of upkeep. We try to have a healthy perspective about what is possible with ratings and I guess this is all just part of our philosophy at CPW.

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@Cannon I appreciate the addition of the RB and Spectrum grippers to the Ratings Data. Any chance we'll see data for the Heavy Grips grippers soon?

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