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  1. solider

    Automation Simulation Software Recommendations?

    I seem to remember a product called "LineDesigner". I think it looked at conveyor buffer etc going in to packaging machines. Simulated machine start and stopping conditions and determined whether the downstream machine would run out of product if the upstream amchine didnt start up soon enough...
  2. solider

    " Do nothing machine" skills testing machine

    Rodneyjax, There is a bit of a complication on this forum which I find frustrating. It seems that if you exchange emails or addresses or anything that allows you to get in touch in anyway outside this forum, then you run the risk of being excommunicated. I can understand some aspects of...
  3. solider

    " Do nothing machine" skills testing machine

    Ok, The Manual I have is: "Manual for Aptitude Testing Machine". The Machine, which I also have, moves a "Bar of Soap" across, up, over, down, across, over, etc. IE nowhere. There 8 cams and mechanisms, all with various settings and adjustments. There is a handle and slip clutch for you to...
  4. solider

    " Do nothing machine" skills testing machine

    Well Rodneyjax and et al I have found a manual of sorts. It was written by some group in Unilever. It tells you how to test, how to set the machine up in a various jammed states before the test, and how to score each. I think, however, there is another manual to go along with it that I dont...
  5. solider

    " Do nothing machine" skills testing machine

    I have a "do nothing machine" too. I think I've got the manual somewhere. If I remember correctly, the manual takes you through how to test someone and how to score. I'll have a look back at the ranch. I'll get back to you if I find it. For fun, and learning, I attached a servo motor to the...
  6. solider

    Response of single DOF spring-mass-dashpot model to half-sine pulse

    A general rule of Thumb: If the duration of the forcing pulse is less than 1/3 of the period of the natural frequency of the single DOF system, then the response will behave as if the pulse is 1/3 duration. IE if the pulse duration gets shorter, then the systems just behaves the same. As I...
  7. solider

    obtaining force/displacement values?

    I agree with MintJulep, as a first stab. If you want to get displacement directly, then you could attach an LVDT to the base/cylinder and roller/piston. If you are going to use an Accelerometer, make sure its a DC Accelerometer - then you can integrate to get velocity and displacement...
  8. solider

    Velocity, acceleration and force in a system

    I might be missing the point of your experiment here, let me know! How about this. It is IMPOSSIBLE to control FORCE AND MOTION at the same time. One is a consequence of the other. If you control force, you get a MOTION which entirely depends on the RESULTANT FORCE on the table, which is...
  9. solider

    Velocity, acceleration and force in a system

    I'm a bit confused with how successful this table movement is going to be. If you want to control velocity and acceleration then you control it with a position vs time relationship, not a force vs time. In fact I dare say, it is virtually impossible to follow a planned velocity and...
  10. solider

    Track for Cam Follower

    My only worry would be whether the original plate wears uniformaly - considering both along and across the embedded plate. If the wear is not uniform, then the new hardened strip will not be uniformly supported - which may cause more issues for you. But I agree with GregLocock, Hertzian contact...
  11. solider

    easy way to change cam design?

    Dear FrenchCad, If you do not have the geometric data, then you will not be able to generate a Cam profile! If the geometric data is still flexible then you have an opportunity to arrange your mechanism to ensure it runs well at your design speeds. The final design should consider: cam...
  12. solider

    easy way to change cam design?

    Hell FrenchCAD, I've taken the liberty to model you a cam in 2D with the motion (timing diagram) you have given. Hopefully the images appear!!). I can not quite make out what the mechanism is in your images - I have taken a guess and modelled it kinematically - ie only the centres of the links...
  13. solider

    Rotation Inertia

    drawoh, Now you have me confused! kg.m/s is definitely NOT a unit of acceleration. The only metric unit of linear acceleration, if we are taking about metres, is m/s^2. There is no "probably" about it. Or are you saying it "tongue in cheek" as we say here. Solider
  14. solider

    Rotation Inertia

    Hi drawoh, I suppose inertia should be called "second moment of mass". (kg*m*m) That is kg(mass) * metres (first moment) * metres (second moment!). In the same way "second moment of area" is written as meters^4, but could be written as m^2*m^2. That is: m^2(area) * m (first moment) * m (second...
  15. solider

    Inertial Load Referral to a DC Motor Shaft

    I agree with zekeman, this is a very complicated thing to optimise. If you want to minimise the acceleration time for a constant inertial load you would choose a gear box ratio that ends up matching the inertia of the load with the inertia of the motor (N = sqrt(load inertia/motor inertia)...
  16. solider

    easy way to change cam design?

    Typically, the motion of the cam follower is designed with a standard cam law, such as modified trapezoidal, mod-sine, etc. Then you use more links, each transmiting motion from one to the next, until you get to the output motion that does the action. The problem is, the linkage between the...
  17. solider

    Inertial Load Referral to a DC Motor Shaft

    This my first attempt to post an image/movie. I hope this will be sort of what you are looking for. The movie shows the 4bar cycling, which is about equivalent to what you have in your figure. The graphs start at zero degrees with the crank at 9 o'clcok. The first graph shows the crank...
  18. solider

    Rotation Inertia

    It is a lot clearer in SI units!!! Inertia units are only: kg(kilograms) x m^2 (metres squared) kilogrammes are a MASS, not a weight (so inertia doesnt care whether its on Mars or some distant star (not sure about black holes though!!) The problem with Imperial units is that lbs are a weight...
  19. solider

    Old Program

    You should take a look at Camlinks from www.camlinks.com/downloads.htm It does cams, and any 2D linkages, (as the name suggests I guess) etc, and calculates forces and torques one you edit thee parts for mass, radius of gyration etc. You can drop in gears also if you want. I've used it a lot...

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