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Thanks to all of you who replied. It looks like mesutphen's solenoid rapper may be the best solution for an off-the-shelf prototype. I will see what is available. Thanks again. Lcubed

I am a retired Aerospace Structural Engineer with only rudimentary knowledge of Electricity. I need a cylindrical, hollow-core coil which will lift a 30-pound slug vertically into its hollow core when energized. The slug is steel and is about 2 inches in diameter. The energising voltage is...

GGU, HiLoks, including tension HiLoks, often cannot be used to replace a bolt of the same size because of the head design. You may be able to use one, but be very sure of your loads and I suggest discussing with HiShear Co. If the loading is 'pure' shear you are probably OK, but since you are...

Wil Taylor, I must respectfully disagree with one statement in your post. While preload does reduce the cyclic damage in this type of joint, it does not eliminate it. The joint always feels some of the applied load, no matter how much preload is applied, and this can sum to significant damage...

Wil, I think it was Production Engineering magazine. Thanks for bringing back some old memories and some excellent advice. Regards, Lcubed

Rule of thumb is the worm will not backdrive if the ratio is 50:1 or higher. You should have no problem at 180:1. If your application is critical, you might consider a brake; they are readily available, and might offer more peace-of-mind. Regards, Lcubed

Impedance bolts have either spring-loaded balls, or a spring ring in a groove on the bolt shank, above the threads. These retaining elements extend beyond the diameter of the bolt and prevent it from sliding from the parts. Impedance bolts are not positive-locking; they can be pressed out of...

dooron, I don't have these materials at this time, but I have used the method in the past and I noted these references. Good luck. "Numerical Analysis of Beam and Column Structures" by W. G. Godden, Prentice-Hall,1965. Also, check out "Newmark's Numerical Method" by N. C. Lind, Dept of...

rb1957, I see. I was just responding to his request for interactions; I haven't tried to find a method for obtaining the actual stresses. I doubt that any interaction approach would work at ultimate, for the reasons you just stated. Since buckling at limit is usually not acceptable where...

Sorry I've been out of touch. rb1957, these are the interaction curves/equations used to provide margins of safety, or margins of deficiency, for the failure mode of buckling of a flat plate. Stable sections, by which I mean sections which do not fail by buckling or crippling, are analyzed...

Exalted one: It is written that the equations of failure for buckling under combined loads are: Shear and Compression: Rs2 + Rc = 1.0 Shear and Bending: Rs2 + Rb2 = 1.0 Bending and Compression: Rb1.75 + Rc = 1.0 (the numbers following the ratios are the powers to which the ratio is to be...

FLAGRO was the predecessor of NASGRO. I don't think free NASGRO is available anymore, but FLAGRO is. FLAGRO is a very effective, reliable, and citable program. Google should get you to it. Regards, Lcubed

Most manufacturers of the components you need have extensive engineering literature and knowledgeable people available to help with new designs such as yours. I suggest you start there. Regards, Lcubed

I learned all about the various versions of Nasgro--free and otherwise--around four years ago. Let me see what I can recall/locate.

Glad to be of help. I think Steven Fahey posted the document originally and I just happened to know about it, so he also deserves thanks. Regards, Lcubed

Magom, Try this: [http://www3.telus.net/faheydumas/Engineering/FAA-AIR-90-01.PDF] Regards, Lcubed

nsjxs, If you multiply the three factors you mentioned in your post of May 20, you get 3. Regards, Lcubed

GregLocock and prohammy, Please expand on your statements about dowels not working in shear. I don't understand. Thanks. Lcubed

Whitetop, It may be easiest to install a "backrun brake" which is basically an overrunning clutch on your input shaft, either before or after it meshes with the driven wheel. These are often used even when it doesn't seem possible that it will be needed. As others have indicated, almost any...

I doubt you actually have a triangular shear panel. Have you tried putting shear flows on the edges and achieving translational and rotational balance?