Acrylic (PMMA) has a tendency to craze, which is probably what you're seeing. This is usually caused by an applied stress or a combination of an applied and/or residual stress and some other factor like UV or chemical exposure. With enough residual stress you could probably see crazing just from...
Thanks Spigor. This makes sense now. The word recommended in 5480-1 Table 5 apparently didn't register and I was confused by the term deviation over tolerance.
Dave Hyman
Mechanical Engineer
I think you want to create a datum point where the load is acting and then create a rigid link between the point and the 4 holes. This will transfer the load to all 4 points. If you need the displacement of the load point you will have to create a measure. The graphical output will not show...
I am working on a mating part to a customers product. They are using a male DIN 5480 spline that we have to interface to. What I have to reference is a competitor's drawing that calls out the hub spline as an N50x0.8x30x60xH9. We purchased the current (2006) version of parts 1 and 2 that seem to...
Look into the "copy geometry" feature. This will let you bring the surface you're interfacing to into the part and use it for reference. I don't use this much and haven't used WF3 yet so I can't give you specifics.
Dave Hyman
Mechanical Engineer
Unless you have a situation where coefficient of friction depends on temperature the interference vs. load capacity of the press will not depend on temperature. So the interference required doesn't change. What does change is the actual interference. If we assume the original poster's design...
How many do you need? If it's a relatively high qty say 1000, you could have a screw machine compnay make exactly what you want for not much more than the standards.
Dave Hyman
Mechanical Engineer
I would suggest finding a supplier that is not based in the far east, but does manufacturing there. The quoted cost of the part may be higher, but they'll already have the resources in place to ensure that you'll get the proper quality.
Dave Hyman
Mechanical Engineer
I'm not so much looking for the standard (B92.1), I can get a copy of it. I'm more looking for info on why it is shown as cancelled on ILI's site and is not superceded by anything. If it is truly cancelled is there something that would be better to design to? My gear vendor pointed me to 92.1...
I went to ili-info to buy the B92.1-96 and it is listed as cancelled and has no information on what superceded it. Anyone have any info on why this is? Is there something else that would be better to design to? My gear vendor recommended designing to this and specificaly not to design to B92.2M...
I can at least answer questions 3 and 4. Li-ion batteries last longest when not fully discharged. Your best bet is to rotate the 2 batteries for the camcorder. Use 1 until it has about 25% life left then switch to the other.
Dave Hyman
Mechanical Engineer
I learned Pro/E in college and I had no problem picking up SWx in about a day, but that was on 2000i2 and 2001. With Wildfire's new interface and more lax attitude toward fully constraining things, I think it's more importatnt that people get a good understanding of CAD best practices then learn...
There may be a way to simulate it with mechanism dynamics. You may be able to drive flexible dimensions with the spring components. Don't know if this would work, but it might be worth a try. The only time I've seen something like a slinky simulated is with an FEA package with an explicit...
Phiah,
8200Nm@62RPM is 53.2kW. paulliu is right about the gear ratio to get the proper speed but it will only yield 6930Nm. And this doesn't include the efficiency of a 2 stage gear box that you'll need to use to get there which could be as low as 80%. Sounds like you should get a good machine...
Not 100% sure on thhis but I think the tan comes from the equation of the involute. As the gears are seperated the tooth thins out. I think you're visualization only works if the teeth have no thickness.
Dave Hyman
iRobot Corp
www.irobot.com
Can you design the joint to react all of the load with the pins and just hole the poieces in place with a coiuple of bolts?
Dave Hyman
iRobot Corp
www.irobot.com
From the research I've done on metal injection molding your qty's seem to be where the domestic operations will start looking at it. You may want to look at philipsplastics.com, they do metal injection molding.
Dave Hyman
iRobot Corp
www.irobot.com
The integration between WF2 and Acrobat is really good I use it daily, but there is also a free command line utility ps2pdf to convert postscript files to pdf's look at www.ghostscript.com
Dave Hyman
iRobot Corp
www.irobot.com
I've generated a reaction force graph from an analysis and I'm not really sure how to interperet the results. The graph shows distance along the curve on the X axis and Force/length on the Y axis. Is this showing me a distributed load profile where the total load is area under the curve?
Thanks...
There is a screen in the Pro/Engineer setup called "Product Interoperability Configuration" It has a place for Mechanica. This directory must be correct or Pro/E won't find Pro/Mechanica. You can run loadpoint/bin/ptcsetup.bat
loadpoint is teh top level directory of where Pro/E is installed...
