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  • Users: PNachtwey
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  1. PNachtwey

    Is there an easy way to tell if a variable or function has been defined.

    I am a long time Mathcad and C programmer. In C one includes header files. Since many header files are often included, it is possible that a variable or function has been defined before so there is a test to see if the variable has been defined before, so it doesn't get redefined. In Mathcad I...
  2. PNachtwey

    These guys should know better

    https://www.fluidpowerworld.com/pressure-makes-it-go/?spMailingID=75597&puid=738988&E=738988 Force makes it go! I have spent years trying to teach them. Akkamaan can verify this. Newton did not include flow or pressure in his 3 laws of motion. It takes a net force to make something accelerate...
  3. PNachtwey

    Can Mathcad generate .svg plots and formulas in LaTeX yet?

    The title says it all. I am still on Mathcad 13 and I have 35 years of Mathcad files that need to be pretty printed. Mathcad 13 can only generate fixed pixel images. Peter Nachtwey Delta Computer Systems http://www.deltamotion.com http://forum.deltamotion.com/ IFPS Hall of Fame Member
  4. PNachtwey

    Looking for input about the IFPS Electron Control Specialist Certification.

    I know there are some real professorial power guys out there. For those that aren't, IFPS is the International Fluid Power Society. Yes, it is some what international since people outside the US get inducted into the IFPS Hall of Fame. There are a few different certifications but in general...
  5. PNachtwey

    "ISO 6403:1988 Hydraulic fluid power — Valves controlling flow and pressure — Test methods&quot

    https://www.iso.org/standard/12740.html?browse=tc The abstract. https://www.iso.org/obp/ui/#iso:std:iso:6403:ed-1:v1:en This document cost money and I don't know if it covers what I am interested in. The title is not very specific. I need to know if it covers hydraulic servo valve testing for...
  6. PNachtwey

    I have retired. I have over 25 yea

    I have retired. I have over 25 years of Mathcad files that reside on a WinXP virtual machine. I need to make this available to someone at the company. I could just leave them the virtual machine. Another option is to upgrade the old Mathcad 13 files to the latest Mathcad Prime. The problem I...
  7. PNachtwey

    Mathcad needs a "remove units" function.

    I like Mathcad's ability to convert between different units but some times it is nice to remove the units. I know that dividing by the units will work but that is kind of a kludge. A simple ru(var) function would be nice. Then one can do this var_unitless = ru(var_with_units) I have spent too...
  8. PNachtwey

    System Identification. Creating a model for a non-linear valve.

    The video shows how a non-linear valve can be modeled. The same program works with linear valves too. My problem is that I don't have a HPU big enough to really push the valve at higher frequencies. https://deltamotion.com/peter/Videos/ValveID.mp4 I wonder if hydraulic design will ever become...
  9. PNachtwey

    My hydraulic sizing program

    I have written a hydraulic sizing program for servo hydraulics. It calculate the minimum cylinder diameter, valve size, hpu size and accumulator size. The units can be changed from metric to imperial. The values calculated are minimums. The minimums are not usually available so the user...
  10. PNachtwey

    More Webinars

    Controlling difficult systems https://youtu.be/FxkCQV-GJIA Controlling under damped systems https://youtu.be/o3jR9r512Ho Does anybody look at these? Peter Nachtwey Delta Computer Systems http://www.deltamotion.com http://forum.deltamotion.com/
  11. PNachtwey

    Tricks for Difficult Systems: Quick Move, I-PD, and Gain

    Another hydraulic servo control webinar. Some people have found these very good training while sheltering in place. https://youtu.be/tzQXAFKgSmY Peter Nachtwey Delta Computer Systems http://www.deltamotion.com http://forum.deltamotion.com/
  12. PNachtwey

    A YouTube video of a recorded webinar about hydraulic testing

    A YouTube video of a recorded webinar about hydraulic testing applications https://youtu.be/AHdH5t88c2A Our customers do a lot of hydraulic testing. We have a National Instruments VI that allow easy integration between NI Labview and our controllers. Together we compete against MTS. Delta...
  13. PNachtwey

    At what pressure do I get full flow?

    Backgound, I have a small eaton-vickers pump that looks almost like this only mine is green. It has a 5 HP motor driving a 5 gpm pump at full flow. https://www.youtube.com/watch?v=81nzCdIX1aw We no problems with setting the system pressure at about 1500 psi when there is no flow. We can't...
  14. PNachtwey

    Basic servo hydraulic tuning

    https://forum.deltamotion.com/t/april-22-2020-delta-hydraulic-cylinder-tuning/734 This is very basic. I tend to be a little more geeky. Over 200 people attended this webinar. Peter Nachtwey Delta Computer Systems http://www.deltamotion.com http://forum.deltamotion.com/
  15. PNachtwey

    Standard Cylinder Sizes

    I am looking for a table of standard cylinder sizes, bore and rod diameter for mm and inches. I have found a table of ISO/metric cylinder sizes but it doesn't seem to cover cylinders with a bore over 200mm The same goes for US/British units. The ISO sizes do seem rather consistent with two...
  16. PNachtwey

    0.1 micron resolution Temposonic rods

    We are testing 0.1 micron Temposonic rods. This will provide us 0.1m/s^2 acceleration resolution when sampling at 1 millisecond. Peter Nachtwey Delta Computer Systems http://www.deltamotion.com http://forum.deltamotion.com/
  17. PNachtwey

    The best Table Tennis Robot

    https://youtu.be/u3L8vGMDYD8 This robot is made by Omron Can Curt Wilson tell us any more? Peter Nachtwey Delta Computer Systems http://www.deltamotion.com http://forum.deltamotion.com/
  18. PNachtwey

    'Evaluating the CTM ( Control Tutorial for Matlab )- Introduction: PID Controller Design

    If you do a search for CTM PID you will find many links that point to about the same data on different universities websites. The link I will use is this one http://ctms.engin.umich.edu/CTMS/index.php?example=Introduction&section=ControlPID They are similar with the layout changing a bit. In...
  19. PNachtwey

    I have been chosen to replace Jack Johnson as technical contributor for H&P magazine

    There will be much where I support what Jack Johnson has done but there will be differences. Jack Johnson is an educator that has written many books. I am more practically orientated. My company has sold over 100,000+ hydraulic controls. If you haven't figured out so far, I can do math and...
  20. PNachtwey

    How many of you know Laplace transforms?

    Why do I ask? I was on a Chinese hydraulic servo forum. There is an on going dispute about different kinds of servo control. The problem I have is that no one understands Laplace transforms. I can show the relative strengths of PID, PD, PI and P only control using Laplace transforms but no...

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