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Thanks, everyone! I rechecked the calculations, and most likely the issue is with the coefficient of friction that I used. The brass we are using is H62. I'll most probably proceed with this arrangement and introduce a locking system (some sort of snap mechanism, maybe).

So I think it's best to go with a trial and error approach. Thanks, everyone!

3DDave, thanks. I was aware of the reduced ability to self-lock because of the greater lead angle during the design phase but I thought I was playing safe given the calculation. I also thought that the oil was the reason. But I confirmed with our assembly vendor that they put no oil there...

Hello, I recently designed a mechanism with a 4-start left-handed trapezoidal thread where the nut translates linearly. The nuts is brass H62 and the leadscrew is SS 304. Pitch is 1.5mm; lead is 6mm Major diameter is 8mm. Coefficient of friction (brass on steel, dry): 0.51 According to my...

Thanks again! I get the discontent regarding the setscrews here and will try a splined connection next time. As for the gear size, it's 45 teeth with a 0.5 module (pitch diameter is 22.5 mm). Working load is bidirectional and about 120mN.m (not much) that's why we were going with the setscrew...

Hi, This makes sense. We're using off-the-shelf dowel pins and those would be easiest to replace. Thanks! I guess that SS416 would better suit our hardness requirement. Thanks!

Thanks, everyone! Unfortunately, our assembly is pretty small and since we cannot use a keyed connection, I think we will have to go with a set-screw & flat combination. I understand the concerns here regarding setscrews, but I am intending to make a prototype with this arrangement and set it...

Hi everyone! I'm designing a mechanism that makes use of shafts. I have two questions: 1.We are locking a 45 T, 0.5M gear in place on a dia 4 mm shaft using two flats (180 degrees apart) on the shaft and two setscrews. The torque is ~120mN.mm and we have already tested out this arrangement on...

Thank you so much everyone! I think we were ignoring surface tensions effects. We cannot make any changes to the tubing since it is part of a disposable set that has already had several iterations and in case we are forced to change it, we'd rather simply change the bag arrangement. I think...

Hello and thank you all! To answer your questions: 1. So, does this air bubble form at C and move up to DE? Where and why is it forming? Is it from air entrained in the water, is it from dissolved air in the water coming out of solution, is it from low pressure at C. >>We use sealed liquid bags...

Hello all, I'm working on improving an existing system that consists of 2 water bags hung on an elevation below a peristaltic pump. A single solenoid valve controls the flow through both tubings (Image attached). 1. Upon repeated operations of this arrangement, we observed that an airlock...