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JAG Engineering LLC

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JAG Engineering LLC last won the day on June 21 2017

JAG Engineering LLC had the most liked content!

About JAG Engineering LLC

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    JAG Engineering, LLC
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    Pratt Institute & U of Santa Clara

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  1. Dr D can likely tell you what to do off the top of his head. (TOLD YOU SO, JUST SAW DR D's REPLY) I would need to refresh myself on this. Conservation of momentum may be the best approach. Now that we know the anvil can move, (anvils as used by a blacksmith don't), the g question makes sense but still many issues. If the hammer is one ounce and the anvil a ton, the anvil will not move for all practical applications. Switch the weight values and the anvil will take off like a rocket. Make either out of a compliant material and the answer will once again be different. You will need to know the mass of the hammer and anvil. If you neglect mechanical friction and air drag, you will arrive a velocity greater than actual. By how much I don't know without running numbers. If you are designing to protect for max impact then that approach will provide some margin. If you must apply a minimum g load as part of a test this would not be a good approach. From the video the anvil is pretty complicated with springs. The g loading will be one value for the base being struck and less for the spring mounted upper section. Your first cut would be to use m1 x dv1 = m2 x dv2. ( for greater detail https://www.physicsclassroom.com/class/momentum/Lesson-2/Momentum-Conservation-Principle) Calculate the velocity of the hammer at impact. Measure the weight of the hammer and anvil. From above you get dv2 (speed of anvil) but this too has a wide range due to many variable. Assuming ideal conditions gives you a ballpark number. Depending on how close you need to be will depend on how close you need to mathematically model the system. It may be a lot easier and more accurate to use instrumentation. Or as Dr D suggested the info may exist in some spec.
  2. The anvil is supported, but not fixed in the vertical direction? So when it is struck it will be propelled up?
  3. I know what you mean but that is not what I have discovered for shear strength of concrete. http://people.tamu.edu/~mhaque/cosc421/SHEAR.PDF Also attached a posted question with answers. One reply suggested the same as you. If there ever was a dimensional constant, it has been lost in time and the odd units accepted. If you have a better source I would like to see it. I was sure there was an error but found the same relationship in a few sources. Then the replies from CE's. What's up with the units in concrete design equations_ _ AskEngineers.pdf
  4. Dr D., For most equations if the units don't work there is an error. This is not true all the time. The strength of concrete is where I ran into this. It is because the results are arrived at empirically. I looked at several sources all had the same equation. Finally I came across a post or a book, I can't recall, that explained why. I forget if the results was allowable force or a stress. But the square root of psi does not get you to either. I get to work what are Civil projects. I find the phraseology puzzling at times. Like "the beam developing its full strength due to the load." The full strength should be X whether loaded or sitting in inventory. What this is understood to mean by civils, is the full bending strength. Or in other words will the beam experience failure in some other mode before the application reaches the allowable max bending stress with all factors of safety accounted for. But these examples aside, if the units don't work, don't assume it is as with the example above. Confirm the equations you are using from multiple sources if taken from a text or handbook.
  5. Dr D. Pit bulls are some of the gentlest dogs unless they are trained otherwise. A lawyer like a politician only cares, or must force themselves to only care, about winning. How much is training, and how much is evil by their nature is impossible to determine.They present a set of information (I hesitate to use facts). The presented information is turned over to a third party judge/jury who come to a decision based on two or more biased and incomplete sets of information. I have sat in court knowing the full story and listening to what was presented which then becomes the only "truth" the jury knows. I have come to realize that we have a legal system and justice is an illusion. I would go one step further and say we have a decision system. As engineers we need to get as close to the truth to prevent danger to those using our designs. The legal system needs to reach a decision so the system can move on. And they are very slow to undo a decision even when confronted with information that would have altered the original decision. My advice about our legal system, avoid it like a disease. If dragged into it don't expect justice any more than you would expect a fair fight from a mugger. Good engineers can keep you out of trouble. A good lawyer can get you out of trouble. For the first case good is a complement. In the latter, it does not necessarily have the same connotation as the first. Praised be to God we made our livelihood as engineers.
  6. Just right click in the article and a dialog box should open with a translate option.
  7. Sounds like a homework assignment. Size a motor to accelerate the flywheel to a specific RPM and do so in a specific time.
  8. I am just thinking off the top of my head. Can you do a simple F=MA to estimate the acceleration or time to move from point A to point B under an ideal situation? If you need more power for the ideal situation or the time required to come up to speed or move from A to B is huge, that may shine some light on it. If you are sizing a system you plan to purchase the manufacturer likely has a work sheet and an applications engineer that can help.
  9. Try this for starters.http://www2.mae.ufl.edu/designlab/motors/EML2322L Drive Wheel Motor Torque Calculations.pdf
  10. Try OnShape. Full cloud based. You can try full function for free as long as you are Ok with your model being open to the public.
  11. This may I used the attached pdf to design a manually driven work platform. Once you have the required torque you can size the motor. I see someone provided a link for robots. I suggest you read both. I find I get an understanding reading multiple sources vs just following the steps. drivetraindesign.pdf
  12. Very true, but the required thinking is just beginning to make my suggestion a working device.
  13. That was my best guess. Sometimes offering a solution to an ambiguous question, gets the questioner to realize how ambiguous the question is, and they can better form the question.
  14. If you cut an off-centered circular groove in the top of the flat disk, and have a pin with a diameter to fit the groove in the bottom of the vertical arm, that acts like a follower, the vertical arm should go back and forth. The direction is linear but the velocity and acceleration I am not sure of. Now that is the start. How all the parts are keep in the proper orientation to each other and guided to allow it to move freely is where the thinking comes in. Speed will also come into play. If the arms needs to move back and forth 10cm at high speed you will have other issues.
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