Recent content by robs314

Again, thank you for your responses :) I have been trying what you have both suggested. I have also received some more advice recently, which seems to work: For symmetry, one end of the coil moves up and the other moves down by the same amount. The end planes must rotate by the total vertical...

Of course, Alephzero, I may have misinterpreted your advice - could you explain your suggested approach a little more? Thankyou

Many thanks for your response Alephzero You are correct that my stress values should be constant along the length (arc) of the wire, but are not. Unfortunately, I think that applying displacements to the boundary is the only way I can get it to deform as it should. As I am only looking...

Hello, I was wondering if anyone can help me with my FEA approach. I want to check that my boundary conditions for a simple quarter torus (representing a section of a helical spring) are correct. I'm neglecting the helical angle at this stage. I have fixed one end in all axes, and applied...

Hello I have done a Soderberg shaft design calculation, taking into account the stress concentration for a keyway. However, I've just noticed that I might need to adapt this for a feather type keyseat, or 2 (parallel, 180deg apart) keyways in the same cross section. I'm sure I read...

It has put my mind at rest that I was following the right approach to start with. I just thought automotive belts should be worth looking at, that's all. Your advice has meant that I will not have to spend any more time looking for automotive belting data. I'm very grateful, thank you :)

Many thanks for your replies I had a suspicion that it was down to longetivity more than anything else. However, my application only needs to be operational for less time than a car's engine, so would it be wiser for me to go down the automotive route? If it were a blower, or compressor or...

My application is not an automotive one. The motor that needs a belt really does develop 60Kw, which I accept is quite large.

I am choosing a timing belt for a 60kw continuous system at roughly 1100rpm. This is a relatively low speed application. After using the belt selection programs written by Gates, Emerson and Goodyear, they all seem to point towards quite hefty installations with large pulley diameters and...

thankyou both very much for your replies @edgepflow, those options would give me a good estimate, but I have no more available data. That reliance website is good, I've come across it before. @thecritic, after looking at some other manufacturers' performance graphs, I can see the linear...

I'm a mechanical engineer selecting a DC motor. I have the values for rated continuous operation, but I would like to have a ball-park figure for "almost" peak power consumed (which can only be sustained for a few seconds). I realize that absolute Peak Torque is when the motor is stalled. For...

Thanks for your reply Would you say, in your opinion, that mounting a motor on a leadscrew-based table is likely to lead to premature failure of the leadscrew due to vibration + stress concentration? I'm still inclined to go ahead with it, simply because it allows so much flexibility in...

Just a short question. As part of a dyno project, I am coupling two dc motors together with a timing belt. To allow the same rig to be used for different test motors, I am considering mounting this (test) motor on a table, which can be positioned in two directions on leadscrews. This would...

Hello I am building a generator dynamometer to test motors and using the motor output to give me the torque produced. I am happy with the linear relationship for torque, but i will need to calibrate this output. I guess I could try using a torque arm with a load cell. This would be fine for...

Hi I need to know the mass flow rate of air passing through a chamber which houses an NDIR sensor, so I can relate that to the quantity of a particular gas passing through. I was just wondering whether using an automobile MAF sensor (hot wire) would be wise. If it could be used, it would be...