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Mechanical Engineering

G B Reid MIMechE, SIMarEST

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G B Reid MIMechE, SIMarEST last won the day on December 19 2019

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About G B Reid MIMechE, SIMarEST

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    Benfleet, England
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    Mechanical engineering "generalist", experience in Design (industrial, mechanical, aerospace grade components), Rail, Underground, defence, process flow optimisation, Project Engineering and Mechanical Systems 3D CAD user (various) since 1992. Electrical design installation and verification.

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  1. I would definitely head for the roller screw option - they completely eliminate backlash which - for your apparent application - would be very important. The above said, I agree strongly with DrD....discuss with your suppliers and bear in mind that their answers will be loaded heavily to get you to buy; not necessarily what is best for you, but what will be best for them. If you always have that at the back of your mind, it should enable a good, informed decision. Good luck!
  2. In short contact pressure. The Dog point you would tend to want to either locate in a hole, or provide resistance with minimal surface damage (such as on a retractable height adjuster on a stand...it will grip, but not damage) The cup point will dig in to the surface a little...providing a little firmer grip at the "cost" of damage to the surface. Generally more used for semi-permanant fixing. There are various other ends available too!
  3. Interesting project... ...I would be inclined to use the pendulum to build energy in a store - such as a spring or elastic band - in order that it acts as a sink and releases. You use the basic F=ma...so you can increase the F.... the trick would moderate the release so that you don't loose it all in wheelspin... Thinking aloud....you could use the pendulum to ratchet a gravitational potential accumulator which would naturally release the energy in a controlled fashion giving maximum acceleration while preventing wheelspin...? Good luck!
  4. Of course they can cause vibrations...it is exactly the same as a flute! the AMPLITUDE of the vibrations, however, is going to be so low as to make them negligible! It is likely to whistle, but the only ay it could be anything other than a minor peculiarity is if it hit a resonant frequency...which SHOULD be checked for as a matter of course... (Tacoma Narrows Bridge)...check your shell frequencies and you should be fine.
  5. The beauty of Engineering is its cross-disciplinary nature. I wouldn't suggest an architect design an aeroplane, but a structural engineer could!
  6. I had a look round and I can't find anything definitive. I always used to find the GRC a great resource, but its become a nightmare to navigate...this may be a start... https://www.grc.nasa.gov/www/k-12/airplane/shaped.html I would suggest it's a hybrid. On a flat plate, you have the face effects, and then the vortices draging against the back. This will have a "resolved face effect" and the same rear vortices. You may be able to find a reasonable facsimile by combining the two..? Good luck!
  7. Hi DrD Thank you for offering to assist! I was undertaking a personal development course, and had not been supplied the "bridging material" that was essential for understanding. This lack of bridging manifested as difficulty in Taylor and Binomial expansions...but it turned out to be a lack of fundamental understanding of the subject which was addressed when the bridging materials were eventually supplied (six months after the start of the course!) I got a very good pass, but not the grade I would have got had I been supplied the full content in good time! C'est la vie!
  8. I agree with Abdulrahman-1....there are a couple of other observations though.... From the images (which are not overly clear where I would like to look...), there appears to be a LOT of iron filings in the female gear..although it may be the way the light is reflecting... They SHOULD NOT BE THERE and erosion of the gears should have been picked up during routine maintenance. Also, there appears to have been some sort of fluid ingress to the gears...neither should have rusted, and both show evidence. The grease should have kept the fluid out, and at worst allowed "black" rust due to
  9. Hi Zhwan. I myself am a member of IMechE. I cannott give you advice specifically on the form as everyone's experience differs, so it would be unique to you. The accompanying notes that are available for the forms are very useful in indicating what the Institute is looking to see...but by far the most useful assistance you will get is from the IMechE membership department themselves. They are very helpful to prospective members and are very keen to grow their membership....that said, they do also want to maintain standards. They will help guide you through the process. Good luck
  10. Okay...first you need to get your sketch right...it is important on this as the overhang (the "loading doorway") is a counterbalance that ensures the load is only applied in the correct way against the rollers....don't forget the cantilever masses either. Once you add the counterbalance the rollers will be loaded in the correct way and it should simply be a case of taking moments - both sides as a double check. Good luck
  11. It is difficult to say for certain, but normally in motors of any sort, the windings overheat and the varnish breaks-down (either burns off or melts) resulting in localised short circuits, identifiable by reduced resistance. ...I could be wrong, but your figures seem to back this up!
  12. One of the most popular - with huge amounts of evidence on its accuracy - is ANSYS....but there are many: COMSOL and NASTRAN at two others I've used int eh past...all three are excellent! Be warned through....FEA (or FEM as you term it - "Analysis" or "Modelling" depending on the acronym used...same thing though) is fraught with dangers! if the constraints are set incorrectly, you can get figures that look right and even seem right, but are completely wrong! NAFEMS - the regulatory body for Finite Element Modelling - recommends NEVER undertaking FEA until the hand calculations have
  13. Okay....this is a bit of a role reversal....I'm far more used to offering guidance and answers than asking the questions, but here it goes.... Can anyone give a reference to a good, easy-to-follow(!), text of Taylor and Binomial expansion of Differential equations? Specifically that used in "Variational Calculus". This is something I have covered in the dim and distant past...and as the saying goes..."it's not what you know, its what you think you know and don't realise you have forgotten!"...alas, it appears I have forgotten! I have some texts on the subject, but alas insufficient
  14. Hi there! This is definitely NOT advisable! The roof is calculated out for the wind loading and the snow loading (as appropriate) with a margin of safety....it is NOT designed to be loaded in addition to this...not without appropriate calculation and checks! If you add static loading to the roof, it significantly lowers the design load of the structure from "environmental Factors"...basically, if it snows, it could collapse, if it is windy it could collapse and if there is a sandstorm (as appropriate) - Insurance would not pay out in a failure of this nature (not to men
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