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  1. peteswift

    file name to appear in a custom property

    Thanks I knew it would be something simple. I couldn’t work this out from the Help.
  2. peteswift

    General Calculation Software

    I had a go with the Tedds lite but it does not allow you to start with new calculations is this easy? Most of the things we would be doing are one offs –shafts levers etc can it do this. Also on the web site there is no mention of cost.
  3. peteswift

    General Calculation Software

    For the work that I do the best thing about MathCAD is that you can make the calcs look similar to the ones you would do by hand. However MathCAD now has a lot of features that I simply would not use. My wish is for a basic MathCAD just to do simple mechanical engineering calcs. £600 is a lot to...
  4. peteswift

    involute profiled modified?

    I have been trying to draw an accurate representation of a spline BS 3550 and have written a program to plot, from a given base circle, the involute between the major diameter and the minor diameter. However is the spline form a true involute or does the cutter “modify” the involute as it...
  5. peteswift

    Bicycle Driveline Efficiency, Chain vs. Shaft

    My understanding is that Chain is more efficient where as the shaft drive is slighlty less so. In commparrison; the efficiency of the chain is about the same in all ratios however the planitary types engage and disengage additional stages so the efficiency changes dependent on the ratio you are...
  6. peteswift

    Taper Roller -pumpin action

    It’s doing my head in because yesterday I was certain it worked that way. But was informed that I was wrong so I tried all my stock of books and none give the answer in simple terms. One infers it and gives a picture with arrows but depends how you read the diagram. Thanks.
  7. peteswift

    Taper Roller -pumpin action

    Do taper roller bearings pump from the small end of the roller to the larger. This is now doing my head in. Thanks in advance.
  8. peteswift

    QuickPick is slow.

    We have upgraded to V15 however the QuickPick selection tool is un-usable. It is incredibly slow. Tried adjusting the setting but it is virtually impossible to select a part. Is it possible to revert to V14 or is there a fix for it.
  9. peteswift

    Tensile capacity/minimum engagement

    corypad For VDI 2230 is meff the length of the thread along the helix or the height of the nut?
  10. peteswift

    Transmission efficiency

    I am interested in the efficiency of large transmissions - 6 x 6 12 tonne off road vehicles and buses /coaches. Form the engine output through to the wheels. Is the efficiency constant with speed or does it reduce at higher speeds? Also what is the cost of a new transmission? Thanks in advance
  11. peteswift

    EN 24

    EN 24 is to British Standard 970 1955 ie old. and is now equivalent to BS 970 1991 817M40 it is also equivalent ti AISE/SAE 4340 It is 1.5% nickel chrome molly steel In the UK it can be geneally bought to T condition with a tensile range ot 850/1000 N/mm^2 or normalised and later heat treated...
  12. peteswift

    Getting Exposure

    I worked with a student at a manufacturing site he designed a small piece of equipment as part of his final year project. To me this was just another development job part of the normal development work. The student decided to patent it. I thought this was bizarre and advised him not to, with...
  13. peteswift

    spray wash header design calculations

    THE RULE OF THUMB THAT I HAVE USED IS THAT THE PRESSURE DROP OF THE SPRAYS SHOULD BE 10% OF THE PRESSURE DROP OF THE HEADER. THIS HAS WORKED ON STEEL PLANT. I DONT KNOW WHERE IT CAME FROM SO I HAVE NO REFERANCES
  14. peteswift

    Shear vs Bending force

    I have done some work stressing out short circular projections a long time ago. The block will be in shear and bending:- The maximum stress from bending lies on the top and bottom surface of the block and will be tensile and compressive. This will go from max to 0 at the neutral axis. The...
  15. peteswift

    Vertical lifting drive train questions

    1) Can the motor back drive the chain to lower the door. Yes. The motor will be being used as a brake. There is no torque reversal i.e. the load is from the same direction. 2) If back driving, can the motor hold the door or are the brakes required to be on. The motor should have the torque to...
  16. peteswift

    Good book?

    I am looking for a definitive text on heat transfer preferably one that covers the theoretical and the practical particularly for cooling of motor, gear boxes etc. I have tried various University texts however they seem to cover the theory and get you through the exam! I have been recommended:-...
  17. peteswift

    Forced laminar flow

    Doh!!! just spotted a mistake the power should be 3.8 kW. This represents a worst case and will probably be around the 2.5 kW level. The casing is stationary and the fluid flows through a gap and the fluid is Dextron 2 automatic gearbox oil. Ro = 787, k = 0.17 W/mk cant remember cp but can...
  18. peteswift

    Forced laminar flow

    We have a cylindrical shell that requires cooling by around 380 kW it is 380 mm outside dia with a .75 mm fluid film of gearbox oil. The pressure drop across it has to be minimal (i.e. preventing turbulent flow regime) with flow rate around 20 L/min. I have tried calculating it but is the...

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