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  1. SERVOCAM

    Help on Scotch Yoke

    Found my answer. [smarty] http://www.qtrco.com/images/Binder%20Lit%20PDF%20Files%20041205/7-K2-SY%20Vs%20RP%20Torques%202.pdf
  2. SERVOCAM

    Help on Scotch Yoke

    Ok, so, here is my new delima, as there is a diference in oppion from two friedns of mine. Ken says that the Scotch-Yoke / Lever Arm gives you advantage because the lever-arm increases in length and the force stays constant/perpendicular, so you gain a mechanical advantage, Force curve is...
  3. SERVOCAM

    Help on Scotch Yoke

    Hi, thank you for the response. Yes, the bar is just rotating back and forth (+90, then -90)I should of stated the location of the actuator to the bar. The Actuator base is fixed and carriage is Perpindicular to the bar (when the bar is at 0 degrees). When at the bar is at 0 degrees, the...
  4. SERVOCAM

    Help on Scotch Yoke

    Ok, so I have thought about this a bit more and going through my memory banks on magnitude of a moment. Also looking at simple terms of Force = Torqe / Radius. So when perpendicualr, the 650 lb-in / 17 inches = 38 lbf would be correct. In this case when the angle of the bar changes from 0...
  5. SERVOCAM

    Help on Scotch Yoke

    I have a problem involving a Scotch Yoke and calculating force and was hoping someone could layout the formulas and calcuations for this problem? I have a metal bar that weights 150 lbs and 2.5 inches square x 34 inches long. The bar pivots in the center. I need to calculate the force required...
  6. SERVOCAM

    CNC: lead screw and load question

    Yes, with a 0.5 in/rev screw and 400 step/rev your resolution will be 0.00125 inches. Keep into consideraion the mecahincs of the system as well (coupler windup, backlash in the ball nut, bearing stiffness, lead error) that will effect your accuracy & repeatability. For example, on lead error...
  7. SERVOCAM

    Need input for servo press feed, I need to become educated

    Use this for the standard: http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=13540&scopelist=
  8. SERVOCAM

    Need input for servo press feed, I need to become educated

    Right, you have to be sure on the PLC that it is a motion control card, not an index card or step/direction card...that it has the funcions you need. For example, like GE Fanuc's DSM-314 - which is a 4-Axis servo module for the PLC for that would have the functions you need. Try this...
  9. SERVOCAM

    Need input for servo press feed, I need to become educated

    I would suggest taking a look at Emerson Control Techniques EN Sereis / FM module or Unidrive SP. There are many others I know of that can also do this application, but I think you will be happy with their products. http://www.emersonct.com This is a feed-to-length appliation with...
  10. SERVOCAM

    CNC Project: Ball Screw Load

    see responses on your other thread: http://www.eng-tips.com/viewthread.cfm?qid=111935
  11. SERVOCAM

    CNC: lead screw and load question

    Another thing to consider when selecting ball screws is compression loading or also known as column loading. I checked the column loading for your exsting screw using a 0.480 root diameter and a simple-simple fixity factor. It can handle about 166 lbf before it will buckle. So depending what...
  12. SERVOCAM

    Step-motor accurate but physical movement not

    >The slop in the chains, gears, & rollers yields errors in excess of 1/2" in 20' length. When you first start out, does it make accurate moves? And drifts over time - tolerance gets worse and worse? Or is it always sloppy? For example, say you move 2ft of the wood and process it (your...
  13. SERVOCAM

    Oscillating / Reciprocating Motion

    define "fairly high RPM" and what kind of forces do you need to produce? Voice coils are fast, but low force. Linear motors can produce the force, but not the speeds like voice coils, but are going to be faster than screws or tangential drives. Many applications I run into like this, the...
  14. SERVOCAM

    Step-motor accurate but physical movement not

    Does the chain drive alway run in the same direction or does it feed the ?? 24 feet ?? and then retract? If it does not continously feed in the same direction, then I would suggest you add an external linear scale for position feedback. I have seen some people on continous converyor systems...
  15. SERVOCAM

    Need input for servo press feed, I need to become educated

    no simple book that I have seen that will get you up to speed. Many mfgs have references on their sites that help. There are several I saw, but mostly out of date or get into design rather then application. There are many single-axis stand alone drives out there that could do what you want...
  16. SERVOCAM

    Alernatives to DVT camera

    Depends on the application on what would be the best choice and like chakorules said - lighting is key, oh and lensing can be as well. I don't have a lot of direct experience but many of my customers use Matrox, Cognex, DVT. PPT and Banner are two others.
  17. SERVOCAM

    CNC: lead screw and load question

    I took a look at the sizing, guess on some of the missing information. Sizing for a 67" long ball screw with a 0.2 in/rev lead with a load of 230 lbs and making a 24 inch move with a velociy of 4 inches/second (260 ipm) using a 0.25g accel rate (profile is pretty square) and I came up with it...
  18. SERVOCAM

    Laser drilling of square hole in countersinks

    I'm not a laser expert (so read at your own risk), but work with many companies the use lasers or build laser machines. Instead of blasting a hole right throught he product with a high-power CO2 laser, when your processing with an Excimer or thick metal, you are delivering a high peak power and...
  19. SERVOCAM

    Laser drilling of square hole in countersinks

    Could you do an Excimer and ablate away the material or DPSS Yag and slowly ablate away material w/ a galvo scanner? Pretty thick material for this?
  20. SERVOCAM

    Extreme range for motors

    Maybe consider a brushless servo motor or direct-drive rotary stage - especially if your looking for high accels/decels and velocity stability.

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