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  1. dfowler

    Simple Cantilever Beam Equation

    Yes, we are making up a few samples to test before we go ahead with this idea. It looks like it will hold but the numbers are too close to failure to assume the math is good enough. We will use a galvanized material as well since the bottom of a garage door is subjected to quite a bit of...
  2. dfowler

    Simple Cantilever Beam Equation

    Thanks for the replies guys. Here is the equation that I have used for deflection: defl = AppliedLoad*LengthofStep^3)/(3*ElasticModulus*MomentofInertia) = P * L^3 / (3 * E * I) And here is the equation that I have used for stress: stress =...
  3. dfowler

    Simple Cantilever Beam Equation

    I am a mechanical engineer who seems to be a bit out of practice with my old statics and physics equations. The company I work for builds garage doors and we have an aluminum extruded strip that runs the length of the bottom of each garage door. This strip has a trough that allows us to attach...
  4. dfowler

    Need to find a metal chip vacuum collection system

    Does anyone know of a decent small industrial size chip collection system that is available? I would prefer an off-the-shelf one that would most likely be cheaper than a customized one. We drill, saw, and route into aluminum extrusions and currently let the chips fall to the ground to sweep...
  5. dfowler

    How do I drill large holes in aluminum extrusions?

    Reposted from: "Fabricated Metal Product Engineering Forum" We are using aluminum extrusions for commercial garage door frames such as in a firehouse or service station garage. To fasten them together in the frame shape we have to drill holes through the horizontal ones and fasten through them...
  6. dfowler

    How do I drill large holes in aluminum extrusions?

    Reposted from "Fabricated Metal Product Engineering Forum": We are using aluminum extrusions for commercial garage door frames such as in a firehouse or service station garage. To fasten them together in the frame shape we have to drill holes through the horizontal ones and fasten through them...
  7. dfowler

    Need to drill a 1" hole through aluminum

    We are using aluminum extrusions for commercial garage door frames such as in a firehouse or service station garage. To fasten them together in the frame shape we have to drill holes through the horizontal ones and fasten through them into the vertical ones. We currently drill the horizontal...
  8. dfowler

    Need to radius an aluminum extrusion

    I am hoping to treat the extrusion shape as a simple rectangle for a calculation. I would then basically be bending a rectangular tube around a radius. If I could calculate minimun wall thickness needed so that my rectangle won't collapse I might know if my extrusion could stand a chance as...
  9. dfowler

    Need to radius an aluminum extrusion

    I need to radius an aluminum extrusion between the ranges of a 20' and a 10' radius. I know this is large, but the shape I need to bend to that is a fairly large almost rectangular shape. The extrusion is 2" x 5-1/2" and it needs to be bent the hard way. If anyone can point me to a source to...
  10. dfowler

    Need Help Finding A High Torque, Low Speed Gearmotor

    I am looking for an AC gearmotor with a set output speed of anywhere in the range of 30-60 rpm. I need to deliver somewhere between 150 to 200 ft-lbs (1800 to 2400 in-lbs) of torque at a set speed. Our power service is 230V 3ph 60hz and price is an issue so I am most likely looking for 'off...
  11. dfowler

    Need help with stepper motor and gearbox design

    Yes, a linear actuator would work. The way the system is currently setup our maintanence crew, who initially tried to design this, installed an air cylinder to move an arm welded to the shaft. The perpendicular length from the center of the shaft to the line of action of the cylinder is...
  12. dfowler

    Need help with stepper motor and gearbox design

    Oops, 21,600 in-lbs of torque = 1800 ft-lbs of torque, not 3600. We need 21,600 in-lbs or 1800 ft-lbs of torque. Thanks. Davey
  13. dfowler

    Need help with stepper motor and gearbox design

    We have a roll forming machine that we are building a safety cage to fit over. The cage is designed as a lid hinged on a solid steel shaft mounted along side of our roll forming machine. The entire cage will rotate and lift up and away off to one side of the roll former. The center of gravity...
  14. dfowler

    Need Help Finding a Suitable VFD

    Thanks for all the feedback guys. I found a Yaskawa VFD that is designed specifically for HVAC applications for around $1400. Anyone familiar with them? We won't be running this thing all of the time either. The VFD will run a fan for approximately 30-40 minutes per day maximum. Each test...
  15. dfowler

    Need Help Finding a Suitable VFD

    I need a VFD for 15 hp motor on 3/60/230 service. It needs a closed PID control loop option which is used primarily for HVAC applications I think. We have a test fixture with a 15hp motor connected to a fan that we want to control. The fan will pressurize a chamber to a certain point and hold...
  16. dfowler

    Any suggestions on the easiest FEA program to begin with?

    Mostly sandwich type door sections. Styrofoam cores with steel sheetmetal glued to both sides. Sections are held together with hinges. The outside hinges have rollers and are the points of contact with the track. And any feedback is helpful thanks :) Davey
  17. dfowler

    Any suggestions on the easiest FEA program to begin with?

    We are designing a chamber with one open wall to install a garage into. This chamber will be pressurized and depressurized to simulate wind loads. Here are the original threads for discussion and help with the design of my overall system. thread403-76925 thread403-80755 We have built the...
  18. dfowler

    A brilliant web site

    Thanks Quark! That is an interresting site, I'm always up for some good reading :) Davey
  19. dfowler

    Any suggestions on the easiest FEA program to begin with?

    Have you tried Cosmos? Is Algor better to use with Solidworks than Cosmos? The Cosmos Express FEA addin is included with Solidworks 2003 and 2004. I have used the Cosmos Express functions. Does anyone know if the Algor interfaces, commands, and outputs similar or are at least intuitive to...
  20. dfowler

    Need Help With Active Pressure Control

    Wow, that is simple. You make a good point though. The manual valve was only to improve a (possibly) slow ramp up to pressure time. The exhaust gate is intended to improve a (possibly) slow ramp down time. If I am going to wait to see what my system response time is on the ramp up, why not...

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