TheAugustKid Posted March 20, 2009 Posted March 20, 2009 What's the point of the grippers saying they're 100 lbs of pressure, 150lbs, etc. etc. when they really aren't? I mean how much pressure does it really take to close a coc #1, 2 etc? I did my HGs on the bathroom scale( I know it's not completely accurate, but close enough) and my 100 was 55 pounds, my 150 was 75 lbs and my 200 was 95lbs. So why advertise them as 100lbs and plus? I don't understand this and it makes it very confusing to tell what I am doing compared to other people. Someone please explain this all to me so I can understand. Quote
Chris Mathison Posted March 20, 2009 Posted March 20, 2009 (edited) So why advertise them as 100lbs and plus? marketing.. its been discussed plenty of times.. RGC is the best system to date.. use that. Edited March 20, 2009 by Chris Mathison Quote
MalachiMcMullen Posted March 20, 2009 Posted March 20, 2009 The gripper companies #'s are completely arbitrary. The first people to start calibrating grippers to find out the actual forces invovled was PDA and Gripboard members, this was long after the companies set their #'s out. The only thing they show is a general progression. Quote Zach Coulter Goals #1- The Planche
TheAugustKid Posted March 20, 2009 Author Posted March 20, 2009 The gripper companies #'s are completely arbitrary. The first people to start calibrating grippers to find out the actual forces invovled was PDA and Gripboard members, this was long after the companies set their #'s out. The only thing they show is a general progression. is there a list or something somewhere to see what the average poundages of different grippers are? Quote
GarytheDino Posted March 20, 2009 Posted March 20, 2009 The gripper companies #'s are completely arbitrary. The first people to start calibrating grippers to find out the actual forces invovled was PDA and Gripboard members, this was long after the companies set their #'s out. The only thing they show is a general progression. is there a list or something somewhere to see what the average poundages of different grippers are? http://www.gripboard.com/index.php?showtop...8300&hl=rgc Quote You Tube Videos http://www.youtube.com/profile_videos?user=dinosaur22840
ae_yogi Posted March 20, 2009 Posted March 20, 2009 Any way of measuring the force needed to close a gripper is arbitrary, RGC or what else. If you measure from the end of the handle you will get a different number than from the center of the handle. The only real important thing is that whatever method used is consistent between grippers and is repeatable from person to person. Quote
diesel Posted March 20, 2009 Posted March 20, 2009 does anybody know how BB or IM gets their numbers? Quote nick DIESEL savonaHe will shelter you with His wings. His faithful promises are your armor and protection. psalm 91:4
Cannon Posted March 20, 2009 Posted March 20, 2009 does anybody know how BB or IM gets their numbers? Similar to the RGC. Hanging weight over the handles until they touch. IM, and I believe specifically Richard Sorin, measured the poundage near the middle of the handle. Warren's numbers match up, kind of. Quote
Yersinia Posted March 21, 2009 Posted March 21, 2009 wouldnt it be more accurate if the rope the weights hang from during a calibration covers as much as a hand does ? Quote Goals! : Dominate the #2.5 and BBSM Done!
Pancake Sprawl Posted March 21, 2009 Posted March 21, 2009 (edited) wouldnt it be more accurate if the rope the weights hang from during a calibration covers as much as a hand does ? i think maybe 4 straps in similar thickness of each of your fingers with the weight hanging in different straps with pinky being weakest and so on. then you'll probably get a rough estimation of what each finger has to minimally contribute in the closing. Edited March 21, 2009 by Pancake Sprawl Quote Name: Chris Height: 6'5" Weight: 315-325lbs Goals: Rep #3, close #4 one day.
Yersinia Posted March 21, 2009 Posted March 21, 2009 hm.. time consuming :p glad im not into calibrating heh Quote Goals! : Dominate the #2.5 and BBSM Done!
StalwartSentinel Posted March 21, 2009 Posted March 21, 2009 wouldnt it be more accurate if the rope the weights hang from during a calibration covers as much as a hand does ? i think maybe 4 straps in similar thickness of each of your fingers with the weight hanging in different straps with pinky being weakest and so on. then you'll probably get a rough estimation of what each finger has to minimally contribute in the closing. If you had four different positions on the handle measured and then averaged them together, you would end up with the weight average of the point between your middle and ring finger. That point for most people is about 1/4 inch below the band (centre of handle) on a COC gripper. Quote
stagger Posted March 22, 2009 Posted March 22, 2009 (edited) Don't know if anyone's pointed this out but measuring the force of a gripper by closing it with one handle against a bathroom scale will give you 1/2 of the actual force. Of the spring's total force, half is exerted on each handle. So if you close a 200lb gripper against a scale, 100lbs of it will be pressing against the scale and the other 100lbs pressing against your hand. Remember that the gripper is "pushing out" in both directions, only one of which is registering on the scale. So, if you look at the numbers the OP got, the heavygrips grippers are reasonably accurate (apparently with a +-10lb tolerance). Physics will just play some funny tricks on you. I've heard that where the lower quality of HGs really shows is in seasoning. They'll lose strength after repeated use moreso than the higher-end grippers. Edited March 22, 2009 by stagger Quote
Magnus Posted March 22, 2009 Posted March 22, 2009 (edited) Don't know if anyone's pointed this out but measuring the force of a gripper by closing it with one handle against a bathroom scale will give you 1/2 of the actual force. Of the spring's total force, half is exerted on each handle. So if you close a 200lb gripper against a scale, 100lbs of it will be pressing against the scale and the other 100lbs pressing against your hand. Remember that the gripper is "pushing out" in both directions, only one of which is registering on the scale. So, if you look at the numbers the OP got, the heavygrips grippers are reasonably accurate (apparently with a +-10lb tolerance). Physics will just play some funny tricks on you. I've heard that where the lower quality of HGs really shows is in seasoning. They'll lose strength after repeated use moreso than the higher-end grippers. No, it's still giving 100% of the force, not "50% in either direction". All of the force is being transferred into the handle that's on the scale. Edited March 22, 2009 by Magnus Quote ((((((—————)))))) PBs 430 raw bench 615 raw dead Inch DL - both hands Blob, Blob50 & Fatman DL - both hands
BroodingMoon Posted March 22, 2009 Posted March 22, 2009 (edited) Frank is correct. You apply 100lbs against the gripper which is transferred to the scales via the spring, the scales push upwards with 100lbs but this is just a reaction force, you don't sum the two to give the total force. A more simple example, I weigh 85kg, when I stand on the scales they push back with 85kg. I don't exert a force of 170kg on the ground. The presence of a spring makes no difference. Edited March 22, 2009 by BroodingMoon Quote Chris Thomas
chriselv Posted March 22, 2009 Posted March 22, 2009 Yep. You don't get half the force when pressing it on a bathroom scale. The reason that you get such low numbers is due to momentum. When IM (and other manufacturers?) measure the force, it's measured in the middle of the handle, and perpendicular to the handle. When measuring on a bathroom scale you distribute the force over the entire handle. This will cause a lot more momentum at the bottom, and almost no contribution at the top. The sum is a lower force than if you tried applying it only in the middle. Quote
BroodingMoon Posted March 22, 2009 Posted March 22, 2009 I think you mean moments, not momentum Quote Chris Thomas
chriselv Posted March 22, 2009 Posted March 22, 2009 I think you mean moments, not momentum My bad, not much velocity in these calculations Quote
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