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  • Users: Deaks
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  1. Deaks

    cargo lift, hyraulic cylinder

    Is there a counterbalance valve in the circuit?
  2. Deaks

    Contamination switch

    Has anyone come across a magnetic plug that electrically indicates when it is contaminated or full? Cheers
  3. Deaks

    Torque to turn with no acces to the centre of rotation

    If I need to measure the torque to turn a device but I can only apply a torque wrench to a bolt at 150mm radius, is there a way of calculating the relationship between the wrench and the dvice?
  4. Deaks

    Tractive effort requirements

    Has anybody got the calculation method for determining the tractive effort required to counter-rotate a tracked machine on various surfaces with varying track length and track pitch? Thanks...
  5. Deaks

    PWM + dither

    The principles of PWM are clear to me, but does anyone have any pictorial representation of what dither looks like when superimposed on the PWM signal. We use these principles in the drivers for solenoids on hydraulic proportional valves. Please direct me to a more appropriate forum if needed.
  6. Deaks

    CISPR12 / 25 standards

    Can any experts on EMI testing explain the differences and if a unit passes CISPR25, is it deemed to have passed CISPR12?
  7. Deaks

    Hydraulic Motor Angular acceleration limitation

    Thanks everyone. A few more details might clarify the situation. The motor is delivering about 735 Nm at 800-1000 rpm and in my mind the rods resemble a wound up elastic band, storing energy. When one end of the system is released the end of the rod will accelerate and the torque from the motor...
  8. Deaks

    Hydraulic Motor Angular acceleration limitation

    I have a hydraulic motor that has an angular acceleration limit of 87,000 rad/s². The motor is driving a drill rod which is of cylindrical section and when it operating at full torque can be wound up by as much as 4 turns (length is 1000m). When the rod breaks into a void the energy is released...
  9. Deaks

    Hydrostatic transmission problem

    Dan, Whoever told you this was a hydrostatic transmission should be shot. Running away downhill is an obvious consequence of using an open loop circuit without motion control valves (aka counterbalance valves). HST would normally be associated with a closed loop system where dynamic braking is...
  10. Deaks

    Design Possibility, can or CANT be doneà

    HST is absolutely the way to go, but flow dividers are useless in high steer angles and a high power drain to boot. Sauer-Danfoss have an electronic control and hydraulic flow control system (ASC - Anti spin control) that senses wheel speed and steer angle (2 or 4 wheel) and shuts down flow to a...
  11. Deaks

    Getting rid of Macros

    Thanks for the replies people. Hopefully the stars and the "Good" rating will make up for my poor etiquette... Ian
  12. Deaks

    Getting rid of Macros

    Hi folks, I wonder if you can help with a problem I'm having with Excel. I have a spreadsheet that I created some macros in to help me with the development stage of an application. I then deleted all the macros but when I open the file it still asks me if I wants to run macros, even though...
  13. Deaks

    Protect a Excel-file with a password

    Brad, You're absolutely right, I've used those same utilities to crack a forgotten cell protection password (which are essentially equivalent to 4 digits, no matter how many digits you use),but I believe a long file open password would still be the safest bet, as the the time to crack can still...
  14. Deaks

    Hydraulically adjustable Tines

    Has anybody got a simple circuit for maintaining the pressure reasonably constant behind multiple tine cylinders, whilst accepting fluid (perhaps into an accumulator) when the ground conditions get harder and the cylinders are forced back. The pressure needs to be settable between 400 and...
  15. Deaks

    hydraulic schematics

    Scott, Have a look at: fluidpowertools.com (and have the trial offer) hydraulicsupermarket.com sauer-danfoss.com parker.com bosch-rexroth.com eatonhydraulics.com Regards, Ian
  16. Deaks

    Back Pressure vs. Pressure Drop

    In the hydraulics industry, pressure drop is the difference in pressure between upstream and downstream of a component, and back pressure is the pressure on the downstrean side of a component that usually returns oil to the reservoir (ie the back pressure is associated with the pressure losses...
  17. Deaks

    Drawing involute splines for hydraulic pump

    Greg, It would be very unusual for someone to use a coupling with an interference fit on a hydraulic pump input shaft, as usually internal damage would result on fitting this type of coupling. Are you doing something exotic? BR Ian
  18. Deaks

    Drawing involute splines for hydraulic pump

    G'day, Look on page 11 of this link for spline info: http://www.pdfx-mcg.com/pdfx_denisonhydraulics/pdfs/PV-PVT-Sales.pdf NUMBER OF TEETH 13 PITCH 16/32 PRESSURE ANGLE 30° MAJOR DIA. 0.875/0.853 MINOR DIA. 0.715 SAE 22-4 (SAE B) INVOLUTE SPLINE DATA CLASS 5...
  19. Deaks

    Hydraulic Motor torque

    Thanks for your inputs guys Regards
  20. Deaks

    Hydraulic Motor torque

    Greg, Thanks for this, but I'm afraid the original formula is correct. Look at any Fluid Power Manufacturers Literature. eg http://www.sauer-danfoss.com/domdb/SASproducts.nsf/2dd81f77829d09d086256591004f57d7/7f5b44a5a2c7605c8625658b00027fe4/$FILE/10030c.pdf Regards

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