I am designing a guard for a material handling system. Low velocity, high mass. During impact I want the guard to deform to absorb the energy like a crumple zone in a car. Can someone point me to the proper analysis or method of calculating the size of the guard required. The construction will...
I have a pallet system that will carry a steel coil into a heated tunnel for conditioning. The temperature will be 750 Celsius. The exposure time can be up to 60 minutes. Is there a source of well documented effects of this temp. on a welded structure? Also what will happen to any bearings or...
I am designing a lifting system similar to a four post hydraulic press. Is there a design "rule of thumb" for the bushing that ride on the post. I am worried about any side loading causing a moment that may bind the platten.
Ward Holloway, Jr, PE
I have a small single phase motor with no name plate. I want to use a variac transformer to control speed, so I want to read amps while it is running but I don't want to cut open the cord. Question.. can I get an accurate reading from around the entire cord? This includes live, neutral and...
I have noticed that when a bearing housing is cast iron it can handle impact loads better than a steel housing. Cast iron is brittle compared to steel. I was just wondering what the reasons are.
Thanks
Ward Holloway, Jr, PE
I am designing a bearing housing. The housing will hold the bearing plus a spacer ring on either side to prevent movement. The spacers apear to have square edges, so I need to design in clearence in the corners of the housing. Is there a standard design or tool for an undercut? I believe the...
When using the secant formula for eccentrically loaded colums, do I need to worry about end conditions? The book I have is not clear on the subject.
Ward Holloway, Jr, PE
Anybody know of a good source of 3D CAD files for standard AC motors. A list by frame size would be great. Currently I am looking for a 56 frame motor CAD file.
I am trying to find dimensioning specs and tolerances for a splined ID that I have. The major dia measures about 1.190 the minor is 1.010 the tooth measure at .281 wide. This looks close to a SAE spline, but it doesn't match any charts I can find. Normaly they go from 1.125 to 1.250 with nothing...
I need to design a machine to cold roll a taper onto a .5 inch shaft. Given the material and dimensions, and amount of displacement per revolution, I need a formula for calculating required load or pressure. I suspect the solution may involve the hardness or modulus of elasticity in compression...
I have to quote a machine to cold roll a taper on a 1/2" shaft. Given the material, speed of penatration, and dimensions of the finished part, is there a way to calculate force required? Any resource will help.
Thanks in advance.
Customer spec. calls for .005" T.I.R. on a round valve stem. Also customer wants a Cpk of 1.67. How can I calculate this? Should my target be set to zero? What should my upper and lower limits be? Am I missing something here?!?
Does anyone sell a triple head gearbox. One shaft in three shafts out. I have looked all over, and the only thing I found was a triple head spindle from Pope Corp. Too much money!
I am looking for a coating (paint like) that can be applied to any part of a machine. When the part cracks the coating will make it blaringly obvious. The part can then be replaced before total failure.
I need a method or equation to determine the critical load for a two degree of freedom system for stability. So far I have the equation of motion. The system is modeled as two bars connected with a rotational stiffness and damper. Any help would be appreciated. Any internet links would also help.
Im not sure if this is a trick question, but i have gotten more than one answer.
What is the equation of Polar Moment of Inertia of a uniform beam supported at one end with a length of 2L?
So far I have gotten...
mL^2 and 4/3ml^2 The first answer treats the problem as a pendulum with a lumped...
I've read plenty of books on high output manufacturing. What I need is book or technique for increasing productivity with in a machine manufacturing enviroment. Our machines are built to suit specific demands. We have some standard products, but sell one or two per month. Any info would be...
