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  • Users: Biggadike
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  1. Biggadike

    Rotary elbow joint method for wire carrier.

    I'm looking at a reasonably exposed rotary wire joint on a wire link which will need to tolerate an angular change of around 90deg. In the past I've dealt with this by careful wire path and cable selection which works OK but isn't structurally good as it takes a lot of space for the wire void...
  2. Biggadike

    Pin on Steel bearing - tough one.

    I'm struggling with this one.. I've got a sprung loaded pull lever (for a switch) the motion of which is governed by a pin in a slot profile. (This provides detents and self centring etc.) The environment is difficult (unsealed unit on landing gear of aircraft) and I'm having problems with...
  3. Biggadike

    Structural bonding of aluminium

    We hear all the time that Automotive folks bond their alumiminium chassis together. Can anyone tell me of a supplier of the bonding agent - its proving hard to come by? Any tips and experiences would be welcome. Chris
  4. Biggadike

    MR Fluid Clutch design.

    I'm designing a clutch unit using Magnetorheological (MR) fluid. I've done lots of research and have tons of data and so on but I'd really like to hear from anyone who has actually used this stuff in a real application. Even if its general impressions and comments, they would be appreciated.
  5. Biggadike

    Screw fatigue in bending.

    I have a group of M8x30 High Tensile (12.9) cap head socket bolts which I am using in a vibratory system (in a vehicle). I have accelerometer data and want to calculate the fatigue life of the screw(s). I am missing two things: 1/ The S-N curve or similar for the material. 2/ The stress...
  6. Biggadike

    Stress concentration on a tube.

    Here is my problem: A rotating steel/aluminium tube is under a known (high)load which is caused by a weight (casuing oscillating stress). The tube has longitudinal (parallel to axis) ob-round holes milled into it. Does anyone know the stress concentration factor of the ob-round holes in such...
  7. Biggadike

    Laser sintered powders

    I'm very interested in quantifying and understanding the microstructural properties and subsequent mechanical properties of laser sintered powders (i.e. those produced by a selective laser sintering machine). From what I have gathered so far, it seems you have two choices: Either use a single...
  8. Biggadike

    SLS made component data.

    I am looking for some data on the mechanical properties of parts made using selective laser sintering. Does anyone know of any books on the subject or other sources? Thanks in advance.
  9. Biggadike

    Momentary locking of 'loose' stator.

    A few years ago I encountered a strange problem which I have yet to explain: A friction clutch was being run at 2800 rpm (Lenze series 4 as it happens). It was only rated for 1400 rpm but Lenze said that only the life would be affected. Fine. The stator was a very loose (good clearance) fit and...
  10. Biggadike

    Spring model

    I've been modelling a fairly complex system, the heart of which is a spring. The model allows the use of either conical or compression springs and when I first created it I used the text book equations which are normally pretty good. What I have found is that for conical springs and wide coiled...
  11. Biggadike

    Aluminium in Aqueous solution

    I'm trying to get some concrete information on the behaviour of aluminium and other normally passivate-forming metals in aqueous solution. Whilst these metals will readily corrode in an aqueous solution under the influence of a raised potential, looking at the Pourbaix diagrams I can find, it...
  12. Biggadike

    Beam calculation doesn't add up.

    I am using a piece of stainless steel sheet as a spring (small deflection, small load). In order to work out the effective spring rate I used a cantilever beam calculation, worked out the maximum deflection under a given load and took that as the effective spring rate. I put all the calculations...
  13. Biggadike

    Material Property Literature ?

    Our reference material on material properties is not comprehensive enough. I have been reccommended the set of two books: Corrosion by LL Shreir The set is £200. Can anyone either confirm the usefulness of the materials data in this book or reccomend a less expensive book to achieve the same...

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