Recent content by Parsnip

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

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

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

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...

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...

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

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...

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...

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...

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...

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

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

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...

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...

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...