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BOLT CLAMP FORCE / THREAD STRETCH
yes but I wanted to avoid all the typical comments that will probably come about bold vibrating loose, because they will be inapplicable to my situation. So i wanted to pose the question just as simple and direct as possible. I cannot use any modified threads, sealer, any rubber, nords-lock...- Matt206
- Post #38
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
I didnt realize that increases stretch without increased clamp load would aid for screw vibrating loose. This is really what I am trying to get at, though I have not said it before, Im only dealing with a inch long screw with quater inch of thread engagement so I dont know if Ill realistically...- Matt206
- Post #36
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
So I still am trying to understand this concept fully – and will greatly appreciate it if someone can clear it up. If we are looking at the logic that CHEZ provided: “Your only inputs are the friction coefficient and normal force. The additional factor which needs to be considered with a...- Matt206
- Post #28
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
Ted, That thinking is in-line my initial thoughts, as you can see in my comments related to Cross Sectional Area --- but The effect is negligible as pointed out in comments above and with what I have witnessed in practice.- Matt206
- Post #19
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
chez, Wow, I understand the diam/friction relationship now --- I dont know why that wasnt clicking for me with the other comments.. Without going into much detail -- a Hand powered screwdriver is used, cannot change the screwdriver, but tested a T-handle screwdriver and was able to achieve...- Matt206
- Post #17
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
Ted that would contradict what all the other comments above are saying about the Diameters influence due to thread engagement- Matt206
- Post #15
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
Guys, These are theoretical examples This is for a specific Biotech application,,,,, below are not in the realm: Applying more torque modifying female threads (thus no change in male thread diam) Lubricant cannot be used material cannot be changed This is handling a very small amount of...- Matt206
- Post #13
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
Hey Guys thanks for all the replies, Follow up question, As I have seen in my situation, D has a large impact on the clamping force. AND From the replies I understand that it is due to the frictional force of the threads, due to the increased circumferential contact area (correct me if I am...- Matt206
- Post #10
- Forum: Mechanical engineering general discussion
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BOLT CLAMP FORCE / THREAD STRETCH
Background: A simple relatively accurate formula to relate Torque to Clamp Force is: T = (F)(D)(K). Where D --= Diameter of bolt, T = Torque, Lets ignore K for this. I am encountering a situation where a screw designed like #1 has an appropriate clamp force with the hand toque that we are able...- Matt206
- Thread
- Replies: 40
- Forum: Mechanical engineering general discussion
