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  1. Parsnip

    Diaphragm pump design

    Because this is for a very specialist application and we can not use proprietry items.
  2. Parsnip

    Diaphragm pump design

    Hiya, A fluid balance pump system is one in which volumes being provided by a diaphragm pump are controlled by the fluid being returned to another diaphragm pump. Does this help? Regards
  3. Parsnip

    Diaphragm pump design

    Please could someone advise on either how to design variable volume diaphragm pumps for use in a water flow balance system - or point me in the direction of a good web resource. Any help would be much appreciated. Regards Parsnip
  4. Parsnip

    Help for design of rotary system

    Hiya all, I wonder if anybody can help me. I am designing a large cylindrical type object (approx 800mm tall and in about 400 mm in diameter) and that has slots for locating small items. This cylinder needs to be rotated using some sort of drive and motor mechanism. The speed of movement is...
  5. Parsnip

    NX 5 Advanced Simulation

    I wonder if any body can help. I am trying to create a user function in the response simulation anaysis. However I keep coming up with errors regarding Java - the problem is the error messages give me no clue as to what to do. The first message said about not having a Java author licence - the...
  6. Parsnip

    Vibration Isolation

    Thank you both for the information - the quick and dirty approach has allowed me to select an isolator for some trial work.The document was also very useful, but i think i need to read it in more depth. Tom: what additional information can you provide? Thanks again Parsnip
  7. Parsnip

    Vibration Isolation

    All - hope someone can help. I am isolating a piece of medical equipment on a lab bench. The mass of the equipment is 65kg and mounted on four vibration isolators. As far as I know the steps to follow are: 1) Find the lowest disturbing frequency 2) Calculate the minimum isolator natural...
  8. Parsnip

    Tolerances of different process

    Thanks all for your help. I do understand the fact that the end use will define the actual tolerances required but for example when mounting a pair of linear rails for a test rig I do not want to specify a ridiculous tolerance that will make the part too expensive. If a 5 micron flatness is...
  9. Parsnip

    Tolerances of different process

    Hope this is the right forum. I need to specify flatness, straightness etc but I never know what is a realistic value to place on the tolerance. Most things are machined and ground if need be. I understand that for straigntness/flatness the overall length must come into it but I have no idea...
  10. Parsnip

    Leadscrew Mounting Methods

    I hope someone can help me. I have a 9.35mm leadscrew with an antiback lash nut. My question is that I am using it to move a medical slide holder and hence need to control the eccentrictity and linearity of the system. I understand that you can have bearings (please can someone explain matched...
  11. Parsnip

    [b]Finding amplitude from PSD data?[/b]

    Thanks for all your help - I reckon that should do me great. Cheers Parsnip
  12. Parsnip

    [b]Finding amplitude from PSD data?[/b]

    Afternoon, Basically the accelerometer was mounted on the vertical axis of the excited part, the PSD was 0.004 g2/Hz at 504Hz, what I want to try and find out is how much has that part moved. Does that make sense? Cheers Parsnip
  13. Parsnip

    [b]Finding amplitude from PSD data?[/b]

    A question to those of you who probably have a far greater knowledge about this than me! I have a PSD plot (g2/Hz) against frequency, there are very distinct peaks at certain frequencies. Very simply I want to find out what the displacement of the object would be at these frequencies. I am sure...
  14. Parsnip

    Hardening and grinding question

    Hiya all, This is a repeat sort of of a question I have posted else where but with a minor difference. I am thinking of using 817M40 as a mounting bar for a v-guide linear bearing system. Since the surface profile is critical I am going to carry out a grinding process on it. My question is: What...
  15. Parsnip

    Suitable Steel for grinding

    Please help if you can. I am needing to specify a suitable steel which needs to be ground. I am attaching a V-guide linear bearing system so the surface profile is quite critical. I am presuming that the steel (preferably not stainless) needs to be hardened prior to grinding but do not know how...
  16. Parsnip

    Worm Wheel Backlash

    Morning all, I wonder if anyone can help me. I have a worm/wheel arrangement driven by a stepper motor and the other end of the shaft mounted in a small (3mm ID) ball bearing. As the application is optical I want to take up as much backlash as possible and am thinking of putting a spring between...
  17. Parsnip

    Women in the workplace...

    I have worked as a chartered engineer for about 10 years and in every company I have been the lone or one of two female engineers. In my first company people used to ring up for my boss, I would answer the phone and they would assume I was a secretary (when they found out I wasn't they had the...
  18. Parsnip

    Fasteners

    Please can some one help. I am trying to use the fasteners (screws) in Pro/Mechanica Wildfire 2.0 to attach two parts together. I assembled the model in Pro/E using mate/aligh etc, then I transferred to Mechanica and put the screws in etc but when I run the design study I just get a fatal error...
  19. Parsnip

    Top down vs Bottom up

    A quick question (I hope). We are using Pro/E wildfire 2 and are having a formalisation of process control for the design of models and assemblies. Having origionally been an advocate of bottom up design, PTC then started to extol the use of top down and now we have a right mixture - up - down -...
  20. Parsnip

    Positional sensing

    Thank you all for your help - the rotary encoders certainly look the way to go and having talked to our electronics/firmware guys it looks as though they will be compatible with what we have already designed. Thanks all once again Parsnip [morning][smile2]

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