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Hello all, We've got an issue whereby a stainless steel pressure sensor housed in an aluminium or zinc enclosure and submerged in a static tank of tap water starts to drift (i.e. the pressure reading starts to continuously increase or decrease away from its nominal value). Other than a small...

Thanks for the responses everyone, that clears it up! @Jboggs: Because interestingly enough, I get quicker responses on the forum!

Hi all, The following mechanical drawing is for a pressure sensor and recommends a 19mm hole with a 20 degree phase for mounting. What does a 20 degree phase mean? Thanks, Amr

Hello all, I'm trying to get hold of some clear plastic pipe of approximately 8" in diameter in order to build a test rig for some pipe inspection robots (straight sections, tees and 90 degree elbows). Unfortunately, the prices I've found online are very expensive. For example, usplastic.com...

Hello all, I'm using ANSYS workbench 13 to model the fluid flow in a pipe with various obstacles in it in order to determine the forces generated on the obstacles by the fluid. However, I'm not sure how to create the geometry for this simulation. From the CFX tutorials, I can see that the...

Hello all, I'm getting some inconsistent behaviour with Solidworks' Smart Fastener tool. Examine the following assembly: The cube in the middle is just a simple cube with several Hole Wizard holes in it. These were created in one step by applying the hole properties to different sketch...

Hello all, I'm making an animation of an assembly that is composed of several sub-assemblies in SW2009. In one of the sub-assemblies, I am trying to move some of its constituent parts and sub-assemblies so that I can make the animation. I have set the sub-assembly to be flexible and I can move...

Unfortunately, the robot does have a length limitation - its needs to be able to turn 90 degree bends, which restricts the maximum length that the robot can take. One of my initial designs faced this problem: with the legs folded back, the robot was too long to navigate the bends.

Thanks for the replies. I would say that the actuation does have to be purely linear. I lever arm and a rotary actuator would take up a lot of space I think. The application is a mobile robot inside a pipe, with the robot pressing its "limbs" against the pipe wall by using linear actuators...

Hello all, I was wondering what mechanisms/actuators are out there that can generate strains of higher than 1 (i.e. the actuator can extend to at least twice its original size). I can only think of two mechanism for doing so: either a telescopic system, or the use of the scissor mechanism, like...

Hello all, Thanks for your advice. Unfortunately, as this is an individual project, I'm not working with experts in the individual fields. Sounds like trying to simulate the entire thing is not going to be practical. I'll look into splitting it all up. --Amr

Hello all, How do you calculate the torque produced by a turbine? If we consider the turbine shown below: Assume that this turbine is working underwater, with a fluid speed of 2m/s and that the turbine itself is 10mm thick. In order to calculate the speed, I work out the time taken for the...

Hello all, I have been looking at the websites of various simulation packages, such as the Solidworks Simulation features, ANSYS, COMSOL and LS-DYNA. Although these packages can simulate many different things, it wasn't clear whether these packages can simulate entire systems. All the examples...

@Mike: Thanks for the suggestion - I am working on several concept ideas and one of them is using a similar principle to what you have suggested. However, I am currently assessing the feasibility of the hydraulic method. @Ted: Useful link: I will contact the company. Thanks --Amr

Hello all, One last diagram! Again, want to make sure that I have fully understood this. Am I there yet? --Amr

Hi Ted, I'm (hopefully!) beginning to see how it all works. Here's another diagram to clarify: A1 would be calculated as Pi*D1^2/4. A2 would be calculated as Pi*D2^2/4. When fully retracted, F = P*A1. When fully extended, F = P*A2. So as the cylinder extends its stages, the force it can...

Hello all, I am looking for a source of small, telescopic hydraulic cylinders. I'm looking for a cylinder with a retracted length of approximately 20mm and an extended length of approximately 90mm. The diameter of the main cylinder is roughly 15mm. I do not yet know the required working...

Hi Ted, Thanks for your post. Let's see if I understood this. According to the link you provided, the first stage, along with all the sub stages extend as one unit first. When the first stage hits its stop, the second stage and all its sub stages extend as one unit. This continues until the...

Hello all, I am familiar with the method of calculating the required pressure in a hydraulic cylinder in order to generate a desired force: P = F/A, where A is the area of the piston. However, looking at cutaway drawings of telescopic cylinders shows that it is more complicated internally, with...

Thanks for both your posts - it's all working now. --Amr