I have an application that requires the wear resistance of a tool steel, but also needs the corrosion resistance of stainless steel. I have been able to find suitable materials, but they are all powdered metal. The shape and size of the parts don't lend themselves well to molding and...
We have a situation where we are using a rotating screw to move an abrasive slurry through our process. Because of the abrasiveness, the material of the screw and housing is 440C stainless steel, heat treated to a Rockwell C of around 50. Now our process people have begun to add lactic acid to...
I currently have a BS in Mechanical Engineering. I am interested in a Masters in Metallurgy. Does anyone know of a university where I can get a Masters in Metallurgy through a distance learning or online program?
Thanks.
Phil
Now that it is possible to transfer information digitally from a CAD package directly to a laser for cutting parts from sheet metal or plate, how many of you still completely dimension the drawings? If you don't completely dimension the drawings, what sort of dimensions, if any, do you show on...
Another engineer and I were discussing a design for a manifold and how many parallel channels we should use in this manifold. The other engineer said an old timer once told him to use odd numbers whenever possible when designing things. He said that is why most wheels have an odd number of...
I am designing a 5' diameter bin which will be filled from a larger bin above. We will dump 75 cu. ft., or approx. 3000 lb., of material into the lower bin in around 5 seconds. I know the normal calculations for sudden impact, but how do you calculate the force and deflection for a falling...
I have an application that currently requires a tapered roller thrust bearing. I am having difficulty fitting a thrust bearing in my bearing housing because the available space limits the diameter of the thrust bearing. One of my co-workers suggested stacking thrust bearings to handle more...
I recently got a quote for a gearbox. It listed the L10 life for the bearings and also the Lhmr life. I assume the Lhmr life is an adjustment to L10 life based on operating conditions, but I had never seen that term before. Searches on the internet haven't turned anything up. Can anyone...
I am designing a piece of equipment which will require two shaft lengths, depending on the application. My boss told me to use a basic shaft with an extension, using oil well threads to attach the extension when necessary.
I can't find any dimensional or other data on oil well threads. My...
In thread406-103836, which is a couple of years old now, diamondjim provided an Autolisp routine for drawing involute gears in Autocad. The routine works great. However, I wasn't able to follow all the equations in the routine to verify if this draws a true involute. It looks similar to...
The company I work for uses a lot of fairly large (450-1000 kW) gearboxes. We have worked with 2 suppliers in the past, and the service from both has gotten pretty poor. All the gearbox manufacturers seem to be so busy they aren't concerned with customer service. We are looking at suppliers...
I am designing a piece of processing equipment which will include a splined, rotating shaft. Multiple replaceable rotating elements are slid onto the full length of the shaft. A large washer and bolt at the end of the shaft will hold everything in place.
However, the process is high...
I am trying to find out the maximum torque that can be transmitted by a shaft on one of our existing machines. The shaft has 10 straight sided splines. The major diameter is 5", minor diameter 4.3".
In a Machine Design textbook (Faires)it gives a formula: T=s*A*rm where s is side pressure, A...
