slazbob Posted September 1, 2019 Share Posted September 1, 2019 (edited) I was wondering if anyone with some expertise with springs could shed some light on my thoughts about this? i was thinking that a gripper spring with full-length arms mounted all the way down inside the handles (to the bottom) would make the gripper easier, than say an inch or two down? my thinking...it would meaning: two springs of the same size; one with regular arms and the other with the long arms. Edited September 1, 2019 by slazbob Quote Link to comment Share on other sites More sharing options...
Daveyboy Posted September 1, 2019 Share Posted September 1, 2019 If the force is applied further away from the spring you'll get more leverage. My Spectrum 280N and 300N grippers have the same diameter spring, but the 300N spring is mounted deeper. It's rated at 144 pounds, whereas the 280N is 131 pounds. Silvis adjustable grippers work on the same principle. Quote Link to comment Share on other sites More sharing options...
Fist of Fury Posted September 2, 2019 Share Posted September 2, 2019 17 hours ago, Daveyboy said: If the force is applied further away from the spring you'll get more leverage. My Spectrum 280N and 300N grippers have the same diameter spring, but the 300N spring is mounted deeper. It's rated at 144 pounds, whereas the 280N is 131 pounds. Silvis adjustable grippers work on the same principle. I don't think that's what he's asking. He's asking about the spring itself, inside the handles. Good question by the way, I never even thought about it. Quote Link to comment Share on other sites More sharing options...
Daveyboy Posted September 3, 2019 Share Posted September 3, 2019 OK, so it's two grippers that look identical from the outside but one has a spring with full length arms mounted really deep? I'm no spring expert, but I think they'd be the same. The force should only affect the visible section of the spring as the rest is inserted securely into the gripper handle. I'd put money on it, just not very much It is a good question, I'd like to see what an expert said. Quote Link to comment Share on other sites More sharing options...
Fist of Fury Posted September 3, 2019 Share Posted September 3, 2019 I actually think it would matter. But just like you I really don't know. Quote Link to comment Share on other sites More sharing options...
Raymond Posted September 3, 2019 Share Posted September 3, 2019 (edited) It would depend on how the the spring is fitted into the handle, I've never seen how they're made or pulled one apart so I'm speculating mostly. If the spring is a shrink fit then the only real difference would be the bend/flexural modulus of the aluminum handle. If the the bend modulus of the spring exceeds that of the handle (which it would only do with a MOFO spring) then a shorter spring insertion would produce a gripper that is slightly easier gripper to close. If it's a clearance fit and assembled with loctite or something similar you could get a few weird things happen on the first few closes but I think that would probably stop after a few reps and then become fairly predictable and settle in with similar characteristics as one with a longer spring. In the end it's a basic moments equation where torque = force x distance and they are the same length of lever, so I don't think it would make a great deal of difference unless you had a really short insertion length or were using a spring that could overcome the bending modulus of the aluminum handle. That being said without actually doing a side by side comparison, I couldn't say for sure. Edited September 3, 2019 by Raymond Quote Link to comment Share on other sites More sharing options...
wobbler Posted September 3, 2019 Share Posted September 3, 2019 With a rigid connection to the handle it would be 99.99% the same. Quote Link to comment Share on other sites More sharing options...
slazbob Posted September 3, 2019 Author Share Posted September 3, 2019 Someone mentioned to me that the exposed part of the spring is all that matters. Like Davey Boy mentioned. Quote Link to comment Share on other sites More sharing options...
Alawadhi Posted September 5, 2019 Share Posted September 5, 2019 @acorn is the man to ask. Quote Link to comment Share on other sites More sharing options...
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