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...
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...
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...
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...
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...
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...
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 -...
Please can someone provide a clue.
I need to monitor the position of a flag positioned on a leadscrew attached to a motor. All the movement is computer controlled and on startup moves the flag to break the beam of an opto sensor. The leadcrew is then activated and the flag moves until another...
Please can anyone help urgently.
I need to design a flat spring that will keep a circular object in place on a metal casting. It needs to be in the form of a three arm spring with each arm providing constant force, however I can not find any formula etc that will help me design it - Help please...
Hi,
I hope someone can help.
I am looking to design an 'o' ring sealing system for a low pressure application (<200psi). I have been given some formula from an article written by Seals Eastern Inc that calculates the compression force, contact area and peak contact stress. Where as the formulas...
All,
I have a spreadsheet that calculates the amount of hours worked each week. I am able to calculate the amount of variance between what was worked and the standard. My problem is I want to show if this varaince is +ve or -ve.
For example
Standard hours = 37 in cell A1
Hours worked = 35:25 in...
I wonder if any one can help. I need to find out how far a cyclindrical object will descend in to the ocean if it has been dropped from a certain height (40 - 5000m) above the surface. The object weighs about 10kg and will be retarded to approx 30 m/s by a parachute which will still be attached...
Hi,
I am a Chartered Mechanical Engineer through the IMechE and Engineering council in the UK, I have a PhD and 14 years industrial experience. If I work in the US or Canada, do I need to obtain PE status and sit all exams etc or is there a scheme by which transfer of qualifiations and...
I am hoping this isn't a question that has been answered since I have searced the forums with no success.
I am having to do some draughting using geometric tolerances but need to find information on the sorts of geometric tolerances (e.g. concentricity, perpedicularty etc) associated with...
This question has probably be answered but I am unable to find the thread so I apologise in advance.
I am using AutoCad LT 2001 and have done a drawing at 1:1. I now want to double the size of one of the drawing views but when I do so the value of the dimension also doubles. I think it has...
