rico300zx Posted July 2, 2009 Share Posted July 2, 2009 I am in the mood to fabricate something does anybody have pictures or a diagram of a gripper calabration contraption? I would like to make something that easily attaches to my squat rack? Internet pictures are fine or some blue prints but let me know pros and cons of different styles if your guys know of any. K Thanks Parris Quote Link to comment Share on other sites More sharing options...
gumpster Posted July 2, 2009 Share Posted July 2, 2009 Here you go Quote Link to comment Share on other sites More sharing options...
rico300zx Posted July 2, 2009 Author Share Posted July 2, 2009 Thanks Gumpster, it looks like it would work but that has to be the most sloppiest thing ive seen. thats what were using these days? no wonder dave said it was dangerous. does anyone else have a pic i could take a look at, or ways to improve this item? rico Quote Link to comment Share on other sites More sharing options...
acorn Posted July 2, 2009 Share Posted July 2, 2009 Thanks Gumpster, it looks like it would work but that has to be the most sloppiest thing ive seen. thats what were using these days? no wonder dave said it was dangerous.does anyone else have a pic i could take a look at, or ways to improve this item? rico Mine is a good bit different but still gives the same numbers. - Aaron Quote Link to comment Share on other sites More sharing options...
climber511 Posted July 2, 2009 Share Posted July 2, 2009 (edited) Picture is a little fuzzy but I just posted a pic of mine in the gallery. Edited July 2, 2009 by climber511 Quote Link to comment Share on other sites More sharing options...
Cannon Posted July 2, 2009 Share Posted July 2, 2009 Thanks Gumpster, it looks like it would work but that has to be the most sloppiest thing ive seen. thats what were using these days? no wonder dave said it was dangerous.does anyone else have a pic i could take a look at, or ways to improve this item? rico Mine is a good bit different but still gives the same numbers. - Aaron What does your's look like, Aaron? I'd be interested to see. Someone was also going to post pictures of Mikael's device...I wonder if those are floating around? Quote Link to comment Share on other sites More sharing options...
Cannon Posted July 2, 2009 Share Posted July 2, 2009 Picture is a little fuzzy but I just posted a pic of mine in the gallery. Mine is identical to climber's (made by him) except it mounts by sliding into the spot for my bench upright. Quote Link to comment Share on other sites More sharing options...
acorn Posted July 2, 2009 Share Posted July 2, 2009 Thanks Gumpster, it looks like it would work but that has to be the most sloppiest thing ive seen. thats what were using these days? no wonder dave said it was dangerous.does anyone else have a pic i could take a look at, or ways to improve this item? rico Mine is a good bit different but still gives the same numbers. - Aaron What does your's look like, Aaron? I'd be interested to see. Someone was also going to post pictures of Mikael's device...I wonder if those are floating around? Mine is super basic, just different design that doesnt ding up the knurling. I'm working on a new design though that will work alot faster. I can post a pic of that when I'm done. - Aaron Quote Link to comment Share on other sites More sharing options...
Magnus Posted July 2, 2009 Share Posted July 2, 2009 Thanks Gumpster, it looks like it would work but that has to be the most sloppiest thing ive seen. thats what were using these days? no wonder dave said it was dangerous.does anyone else have a pic i could take a look at, or ways to improve this item? rico Heh, I definitely wouldn't use a wood clamp. I clamp mine down with 2 bar-clamps, on a very solid workbench. Chris's setup looks way better than the usual round-stock posts. I'll probably make a new one, now Quote Link to comment Share on other sites More sharing options...
lukeamdman Posted July 2, 2009 Share Posted July 2, 2009 I bought one from Chris and the quality is outstanding. Quote Link to comment Share on other sites More sharing options...
climber511 Posted July 2, 2009 Share Posted July 2, 2009 Be careful when using any model - you have a pretty good lever arm there - I know Handgripperman tipped over his power rack a few years ago. And a couple hundred pounds flying around could ruin your day. Make sure your bench, rack or whatever can take what you're giving it. Quote Link to comment Share on other sites More sharing options...
acorn Posted July 2, 2009 Share Posted July 2, 2009 Be careful when using any model - you have a pretty good lever arm there - I know Handgripperman tipped over his power rack a few years ago. And a couple hundred pounds flying around could ruin your day. Make sure your bench, rack or whatever can take what you're giving it. Agreed, I was using one of those chain load cinchers to lift the weight on mine awhile back and had it break loose as I was reaching to let it down. Luckily there was only 120ish pounds on there as I was unloading. It did give me a nice bloody nose though and face its own destruction seconds later. - Aaron Quote Link to comment Share on other sites More sharing options...
tselegala Posted July 2, 2009 Share Posted July 2, 2009 It seems ok to me. One point i'd like to share though, this will give you the smallest amount of force to close the gripper not the actual amount of force required to close the gripper with your hand. When you hold the gripper in your hand the center of your hand is where the resultant force is applied (assuming equal strength is applied by both sets of fingers). Actually the middle and index fingers are usually stronger so the resultant force would probably be aligned with the middle finger. The difference should be quite significant since the total length of the handle is so small. Just multiply the load by the ratio of both distances (large over small) to get an acurate reading of the actual force applied by the hand. Quote Link to comment Share on other sites More sharing options...
Cannon Posted July 2, 2009 Share Posted July 2, 2009 It seems ok to me. One point i'd like to share though, this will give you the smallest amount of force to close the gripper not the actual amount of force required to close the gripper with your hand. When you hold the gripper in your hand the center of your hand is where the resultant force is applied (assuming equal strength is applied by both sets of fingers). Actually the middle and index fingers are usually stronger so the resultant force would probably be aligned with the middle finger. The difference should be quite significant since the total length of the handle is so small. Just multiply the load by the ratio of both distances (large over small) to get an acurate reading of the actual force applied by the hand. You're correct that moving the strap up the handle increases the weight. Call us lazy, but in the interest of lifting as little weight as possible, we're all using the end of the handle. It also gives a consistent reference for strap placement seeing as how 1mm difference can affect your number. There's no need to make the number bigger by applying math because all we're trying to do is compare two numbers. Quote Link to comment Share on other sites More sharing options...
rico300zx Posted July 2, 2009 Author Share Posted July 2, 2009 Thanks Gumpster, it looks like it would work but that has to be the most sloppiest thing ive seen. thats what were using these days? no wonder dave said it was dangerous.does anyone else have a pic i could take a look at, or ways to improve this item? rico Mine is a good bit different but still gives the same numbers. - Aaron Thanks AC Quote Link to comment Share on other sites More sharing options...
tselegala Posted July 3, 2009 Share Posted July 3, 2009 It seems ok to me. One point i'd like to share though, this will give you the smallest amount of force to close the gripper not the actual amount of force required to close the gripper with your hand. When you hold the gripper in your hand the center of your hand is where the resultant force is applied (assuming equal strength is applied by both sets of fingers). Actually the middle and index fingers are usually stronger so the resultant force would probably be aligned with the middle finger. The difference should be quite significant since the total length of the handle is so small. Just multiply the load by the ratio of both distances (large over small) to get an acurate reading of the actual force applied by the hand. You're correct that moving the strap up the handle increases the weight. Call us lazy, but in the interest of lifting as little weight as possible, we're all using the end of the handle. It also gives a consistent reference for strap placement seeing as how 1mm difference can affect your number. There's no need to make the number bigger by applying math because all we're trying to do is compare two numbers. Yeah no need to do this if you are comparing two grippers. It's just food for thought. In case someone was interested. Quote Link to comment Share on other sites More sharing options...
rico300zx Posted July 3, 2009 Author Share Posted July 3, 2009 Picture is a little fuzzy but I just posted a pic of mine in the gallery. quality workmanship climber! Quote Link to comment Share on other sites More sharing options...
rico300zx Posted July 3, 2009 Author Share Posted July 3, 2009 It seems ok to me. One point i'd like to share though, this will give you the smallest amount of force to close the gripper not the actual amount of force required to close the gripper with your hand. When you hold the gripper in your hand the center of your hand is where the resultant force is applied (assuming equal strength is applied by both sets of fingers). Actually the middle and index fingers are usually stronger so the resultant force would probably be aligned with the middle finger. The difference should be quite significant since the total length of the handle is so small. Just multiply the load by the ratio of both distances (large over small) to get an acurate reading of the actual force applied by the hand. Alexis Can you type that out showing the math in an example using a gripper that you have done this with? I'm not sure how to multiply loads by ratios. Maby seeing it could help. Rico Quote Link to comment Share on other sites More sharing options...
tselegala Posted July 4, 2009 Share Posted July 4, 2009 It seems ok to me. One point i'd like to share though, this will give you the smallest amount of force to close the gripper not the actual amount of force required to close the gripper with your hand. When you hold the gripper in your hand the center of your hand is where the resultant force is applied (assuming equal strength is applied by both sets of fingers). Actually the middle and index fingers are usually stronger so the resultant force would probably be aligned with the middle finger. The difference should be quite significant since the total length of the handle is so small. Just multiply the load by the ratio of both distances (large over small) to get an acurate reading of the actual force applied by the hand. Alexis Can you type that out showing the math in an example using a gripper that you have done this with? I'm not sure how to multiply loads by ratios. Maby seeing it could help. Rico 1) Sure. Let's say that the strap that was used to calibrate the gripper with the device was one inch wide and it was placed at the end of the handle. The resultant force would be in the middle of the strap (at 0.5'' from the end of the handle or at 4'' from the middle of the spring spiral). 2) Now for the hand : Personally, my smaller fingers are weaker than my index and middle finger, therefore i will assume that the resultant force is aligned with my middle finger. In my case, every time i close the gripper, my middle finger is right where the COC strip is (in the middle of the handle). The strip is 2.75'' away from the middle of the spring spiral. 3) Let's say that your gripper was evaluated at 110lbs with the conventional method stated in paragraph 1). Therefore, the total resultant force applied by the hand to close that particular gripper is (4''/ 2.75'') x 110 lbs = 160lbs. In other words just multiply all the poundage's by 1.45 to get the force required to close the gripper with the hand. Hope this helps. Quote Link to comment Share on other sites More sharing options...
rico300zx Posted July 4, 2009 Author Share Posted July 4, 2009 Thankyou Quote Link to comment Share on other sites More sharing options...
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