Hello All I am working on a power train for a quadcopter - see attached the PDF. I am wondering about the gearbox for power transmission, guessing its a bevel gear design. I would like to keep the belt drives on the same plane. Also, should I step the RPM down from the motor to the drive shaft? Thinking a belt or a direct geared connection might be best. Or step the RPM down when I transfer to the belts? Can anyone advise on what this might be called and maybe a manufacturer? Thanks in advance. Jack. Attached Files Rotation Schematic.pdf (259.4 KB ..read more

Hi all, I am trying to find a formula to calculate and check an existing spreadsheet I am working with. I have a 3/4-16 SHCS, I am putting 214.5 ft/lbs. in the screw and want to know what force the screw is exerting on a fixed object or how the force is multiplied through the fastener., or Linear Force Generated by said input. I am not interested in the Axial forces, Clamp Load or lifting capacity as that seems to be the only things that seem to come up on the web and here when I looked for it. Thanks in advance, Regards, Jim ..read more

Sometimes something that should be simple may not be so. I have to clamp a number of plastic sheets vertically and need to know what clamping force to use. Clamping a single sheet is simple - the clamp force is the weight divided by mu. But what clamping force is required when we clamp multiple sheets vertically? I think it is the sme force as the force is the same at each sheet interface, but that feels wrong. Does anyone have the answer and the explanation? Attached Images 2024-04-15_125002.jpg (117.0 KB ..read more

Just wondering if anyone is aware of an industry standard thread shear allowable stress? Thanks ..read more

Hi all, I want to build a test rig for bolts. I require two types of bearings NUP 314 ECP and F4B 010-FM. I am a bit confused in selecting as I don't get if they will work under fatigue loading. For NUP 314 ECP the sinusoidal loading is upto 115 kN amplitude with a frequency of 15 Hz whereas for F4B 010-FM the sinusoidal loading is 5 kN with a frequency of 15 Hz. Can you kindly guide me in this prospect so that I can incorporate these into my design? Thank you for your response in advance. Regards ..read more

Need a little help finding the right equation for my situation. I've tried a couple of the beam equations and cant seem to get accurate results. I've got a reel trailer that holds large wooden reels carrying electrical wire on a shaft supported by two uprights on each side of the trailer. The wooden reels only contact the shaft at the holes in each end of the flanges. So I've got a shaft supported at both ends with two point loads that aren't equally spaced on the shaft. Im trying to figure out the maximum amount of deflection the shaft will have based on the weight of the reel. Also, the ma ..read more

I'm hoping someone can offer advice. I am designing a Prop for a Dump Trailer tipping body and have been asked to submit a hand written report showing all calculations. We would usually outsource the calculations but we are looking to start doing them 'in-house'. I haven't had to carry out calculations for many a year as I have usually relied on software... Which has left me over reliant on it. Does anyone know of any reference material for anything resembling calculating the load on a support on an inclined load supported at one end by a pair of pivot pins. I am only interested in the cal ..read more

Greetings. Help me please. What grade and what thickness of a metal plate (might be slightly bend (i know it is not the right word)) i will need with 32’x9’ size for a trailer to withhold 130,000lbs in 10’ concentrated weight? I need a trailer with the thinest deck possible. (115,000 is also an option). Thank you ..read more

I have a cantilevered beam supports in two spots and I am trying to resolve the reaction loads at the connections but for the life of me I cannot resolve the vertical reactions RAv and RBv. Sorted the horizontal (42.7kN) but not the vertical. Points A and B will be bolted to horizontal members and I need to make sure they are correctly sized. Too many years since uni........I can run it through FEA but I want to verify with hand calcs. Attached Images Beam Reaction Loads.jpg (37.1 KB ..read more

I am not an engineer, just a tinkerer. I am looking for a formula that can determine the change of the inner diameter of a tube when a threaded nut is torqued on. Best example I can think of is on a rifle barrel with a threaded muzzle. When a muzzle device is threaded on and torqued, at some point, the rifle bore (inner diameter) constricts. Is there a formula so I can predict the change in inner diameter based on the torque applied ..read more