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Recent content by bvasa

  1. bvasa

    Rolled Cylinder

    If you don't mind going a completely different process direction, you might consider flowforming. You'd start with a thicker walled, short tube at approximately the finished ID, then extrude it using an internal mandrel and external rollers to reduce the wall thickness and extend the length...
  2. bvasa

    Best metal spinning out there?

    Tolerances in flowforming or spinning depend to a large extent on: diameter material thickness (before & after forming) finished part length smooth or toothed inner wall If you can provide some additional description of the part you have in mind, I can provide better feedback. Without knowing...
  3. bvasa

    Wiseman transmission?

    Yup, they were my first thought too, but I'm trying to give this racing governing body credit for correctly spelling the names of components that they strictly prohibit. I could very well be wrong about that, though. Thanks,Terry! Regards, Ben
  4. bvasa

    Wiseman transmission?

    Anybody know of a competition gearbox from a company called Wiseman? I found it listed as one of the competition transmissions that are specifically not allowed in a NZ saloon racing class, but that's the only mention I can find of it. I figure that if it's banned, there must be something...
  5. bvasa

    205 mph on a Honda 1000 cc?

    The story I read indicated the officer clocked the bike over a 1/4-mile trap - 4.5 seconds at 200 mph. 160 mph would be 5.62 seconds. Could be reaction time on this one, or parallax error. $215 is pretty cheap for a notarized trophy like that, but the road rash potential is a bit above my...
  6. bvasa

    forging for small quantites

    It's just a matter of cost. At this volume, you're going to have to pay for tooling up front and setup charges each time the parts are run. If your packaging is good enough to protect the inventory from rust and degradation, maybe you could make several years' worth of parts in one setup. The...
  7. bvasa

    Anybody Used OpenCNC controls on CNC

    OpenCNC is also a brand name for a specific CNC control package based on PCs running Windows. They claim to be less expensive and more flexible than the conventional CNC controls (ALlen-Bradley, Fanuc, et.al.) as well as the PLC running behind them. I've had OpenCNC quote a retrofit for one of...
  8. bvasa

    Machined fit?

    Take a look in Machinery's Handbook under cylindrical fit tolerances, and there'll be a range of diameters for a given fit tolerance. It sounds like you want a locational-slip fit. If you don't have access to the book, post your joint diameter and I'm sure you'll get a couple interpretations...
  9. bvasa

    Grinding thin aluminum to obtain .02 flatness

    I wonder if maybe a completely different solution is in order. With the thickness-diameter ratio of your plate, along with a ~1/32" grid of holes, it doesn't sound like this is intended to support significant loads. This leads me to think it might be some kind of diffuser plate or flow...
  10. bvasa

    Help with Snowmobile Catalytic Converter

    Here's a contact for a potential industrial partner for your project: mpmidgley@aol.com
  11. bvasa

    Control freewheeling in GM transmissions (4L60-E)

    An aftermarket shift kit would be the easiest way to do this project, if you didn't want to just figure it out for yourself. These kits usually consist of a couple new check balls and a new metering plate that gets sandwiched between the wormtrails. This changes the shift logic and...
  12. bvasa

    Quick Die Change Systems?

    There are lots of details that go into making a QDC program work, and Griffy brought up the most important part - getting people involved. If you can pace the program so that your setup people and operators have a chance to come up with many or all of the ideas, you've established the basis for...
  13. bvasa

    Quick Die Change Systems?

    No matter what off-the-shelf system you go with, there are some basic issues that you'll need to address. Most of the presses on which I've implemented quick change have been relatively small, with die sets in the 250-300# range. The off-the-shelf solutions I'm familiar with only address...
  14. bvasa

    Forces required for cold rolling

    I can't give you the formula, but I can add a couple factors to it- 1. Surface area of contact between the forming tools and the shaft 2. Yield strength of the material (it changes during the process as the material is cold worked). 3. Lowering of the yield point by adiabatic heating, a side...
  15. bvasa

    Micro Tensile Test comments requested

    I guess a more general approach to my question would be: Is there a good reference book or a test methodology that would allow me to predict the strength of a cold-formed part, knowing the raw material (focusing on low-carbon steel for now), initial heat treat condition, finished dimensions and...
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