Force Settings For The Adjustable Hand Gripper

Force Settings

A simple torque calculation and a measurement of the resistance on the lowest settings was used to calculate the force required to close the gripper on all the possible settings. This calculation assumes the springs are identical. Here is a table showing the information in a set format :

 

 

Force required to close gripper - set listing
Positions Force in lbs
1 3 45.00
1 4 56.41
1 5 69.58
1 6 84.50
1 7 101.17
1 8 119.60
1 9 139.78
1 10 161.71
1 11 185.40
1 12 210.84
2 4 64.32
2 5 77.49
2 6 92.41
2 7 109.08
2 8 127.51
2 9 147.69
2 10 169.62
2 11 193.30
2 12 218.74
3 1 45.00
3 5 87.15
3 6 102.07
3 7 118.74
3 8 137.17
3 9 157.35
3 10 179.28
3 11 202.96
3 12 228.40
4 1 56.41
4 2 64.32
4 6 113.48
4 7 130.15
4 8 148.58
4 9 168.76
4 10 190.69
4 11 214.38
4 12 239.82
5 1 69.58
5 2 77.49
5 3 87.15
5 7 143.32
5 8 161.75
5 9 181.93
5 10 203.86
5 11 227.54
5 12 252.98
6 1 84.50
6 2 92.41
6 3 102.07
6 4 113.48
6 8 176.67
6 9 196.84
6 10 218.78
6 11 242.46
6 12 267.90
7 1 101.17
7 2 109.08
7 3 118.74
7 4 130.15
7 5 143.32
7 9 213.52
7 10 235.45
7 11 259.14
7 12 284.58
8 1 119.60
8 2 127.51
8 3 137.17
8 4 148.58
8 5 161.75
8 6 176.67
8 10 253.88
8 11 277.56
8 12 303.00
9 1 139.78
9 2 147.69
9 3 157.35
9 4 168.76
9 5 181.93
9 6 196.84
9 7 213.52
9 11 297.74
9 12 323.18
10 1 161.71
10 2 169.62
10 3 179.28
10 4 190.69
10 5 203.86
10 6 218.78
10 7 235.45
10 8 253.88
10 12 345.11
11 1 185.40
11 2 193.30
11 3 202.96
11 4 214.38
11 5 227.54
11 6 242.46
11 7 259.14
11 8 277.56
11 9 297.74
12 1 210.84
12 2 218.74
12 3 228.40
12 4 239.82
12 5 252.98
12 6 267.90
12 7 284.58
12 8 303.00
12 9 323.18
12 10 345.11

 

Also in sorted order from minimum to maximum force required :

 

Force required to close gripper - sorted
Positions Force in lbs
3 1 45.00
4 1 56.41
4 2 64.32
5 1 69.58
5 2 77.49
6 1 84.50
5 3 87.15
6 2 92.41
7 1 101.17
6 3 102.07
7 2 109.08
6 4 113.48
7 3 118.74
8 1 119.60
8 2 127.51
7 4 130.15
8 3 137.17
9 1 139.78
7 5 143.32
9 2 147.69
8 4 148.58
9 3 157.35
1 10 161.71
8 5 161.75
9 4 168.76
2 10 169.62
8 6 176.67
3 10 179.28
9 5 181.93
11 1 185.40
4 10 190.69
2 11 193.30
9 6 196.84
3 11 202.96
5 10 203.86
12 1 210.84
9 7 213.52
4 11 214.38
2 12 218.74
6 10 218.78
5 11 227.54
3 12 228.40
7 10 235.45
4 12 239.82
6 11 242.46
5 12 252.98
8 10 253.88
7 11 259.14
6 12 267.90
8 11 277.56
7 12 284.58
9 11 297.74
8 12 303.00
9 12 323.18
12 10 345.11

These calculations have been checked in multiple ways. Several measurements were taken of the low resistance settings and they agree with the calculations to within a couple of pounds. For benchmarks, the #2 (195 lbs) and #3 (280 lbs) Captains of Crush grippers were used by testing several settings on the adjustable gripper below and above the CoC grippers, and they behave as expected. Note the decimals in the tables are meaningless, the precision of the poundages is of the order of a few percent.

Concerning variable settings, by adjusting the position of your grip you can greatly effect the force you need to exert to close the gripper. Go higher up to increase the effort and drop down to decrease it. So if you are at one setting and can do a close but can't quite reach the next, either try the one you are at with a higher grip position, or try the next one with a lower positioned grip.

*Important*, when finished do not store the gripper with the bar against the stop pin, if the springs are stored under tension they will over time become slack.

Training

The greatest advantage that the adjustable gripper has over the Captains of Crush grippers is the much smaller increments in force settings. This allows training methods which are not possible with the Captains of Crush models. You can try progressive resistance training in which you add just a small amount of weight each week (vary the spring position as well as your grip position to achieve this), or you can try a cycling program.

Source: S. Stamp. Article adapted for use with the adjustable Power Gripper.