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  1. falcon4

    unfold / flatten sheet metal tube

    the bevel is the result of the angular cut where it meets the 6" diameter. i cannot be supressed. I was looking for a way to develop that square face, haven't got there yet..
  2. falcon4

    unfold / flatten sheet metal tube

    I have a sheet metal tube with a circular cut on one end. such as if you inserted a 3" tube into a 6" tube at an angle of 30 degrees. Off the axis of the 6" pipe. so now the 3" pipe has a cut that follows the profile of the 6" pipe. A typical y intersection. I now want to take that 3" pipe and...
  3. falcon4

    helium leak rate based on 5% helium fill

    That is correct, Since the leak rate is for the cummulative rates of all possible leak paths, we are interested in the "global" as you put it, value. If we find a non-conforming valve, we can either "probe" it, use leak detection fluid, or immerse it in alcohol or DI water, to locate the leak...
  4. falcon4

    helium leak rate based on 5% helium fill

    Since we will have high pressure involved we plan to first proof test the valve at 150%WP. Then we need to install a burst disk into the valve. We will then perform the HE /N2 filling operation with the valve still in the proof fixture. Once pressure and temp stabilize we'll do a 60 second...
  5. falcon4

    helium leak rate based on 5% helium fill

    i have heard of Helium ratios ranging from 1.4 to 2.6 in relation to Air. I assumed a value of 2.0 and came up with 3.35e-5 scc/sec. I feel more confident now to review these figures with the current source who calculated the leak rate to 9.96e-6. I don't want to build this test any tighter...
  6. falcon4

    helium leak rate based on 5% helium fill

    I'm trying to develop a Mass spec leak rate for a high pressure valve. (3000-3200 psig) We are allowed a mass loss rate of 0.0015 grams/hr. (nitrogen) I would like to convert that to scc/sec nitrogen and then to scc/sec Helium leak rates. Once that is accomplished I need to develope a...
  7. falcon4

    Passivate before or after lap

    We are having a discussions as whether it is better to passivate before or after performing final Lap / Polish of a metal seat. Material 300 series CRES, min 8 finish. we perform the lap in house but the part is machined and passivated prior to our reciept. Is there any spec that stipulates...
  8. falcon4

    soil compressive strength

    thanks for the replies. I agree, boring the 20" and pouring will be the most sensible, since there are only 8 piers to pour. Thanks again
  9. falcon4

    soil compressive strength

    Does anyone have a simple process to test compressive strength of soils in the bottom of a post hole, dug for an attached deck. Building codes are dictating a 20" minimum hole size unless comrpessive stregth of the soil is determined. Thanks Gary
  10. falcon4

    LH / RH Machine Assemblies

    I do this frequently with fixturing for right and left hand components. I open an assembly, insert an unused base part. I use a thin plate at the exact location of the origin. Then I insert the completed right or left hand assembly appropriately to the left or right of this plate. Then i mirror...
  11. falcon4

    ceramic insulator material

    I'm looking for a suggestion for a ceramic insulating plate. I'll be using the plate on a 3" x 60" aluminum plate heated internally by an element to about 500F. the plate will be about 1" thick. along the lower 1" of this plate's face I'd like to attach a 1" x 60" long strip of ceramic plate. My...
  12. falcon4

    Insulation Res. and Dielectric test parameter reduction

    We have solenoids that we purchase from a manufacturer. They perform Insulation resistance and Dielectric testing IAW a define test procedure. We then send the assembly out into the world for use. We occasionally receive the product back from various airlines to be retested and recertified for...
  13. falcon4

    revision cloud

    I see a battle of engineering dwg vs structural detailing. It's true SW does not have the detailing ability so useful to the structural detailers use to autocad. It is also true SW does a fantastic job of causing adherence to established dwg standards. Some time spent wringing the "art" you...
  14. falcon4

    valve ball surface finish

    The valves are used to contain a 3000 PSIG nitrogen and CO2 mixture. they require low actuation forces and extremely low leakage rates. Because of this we have been using balls with a 3 finish and they have always come in with a mirror like appearance. We were told they were grade 100V (valve...
  15. falcon4

    valve ball surface finish

    I am trying to update our ball-valve ball specifications. I need to provides specifications for a 1.0" dia ball made of 316 SS. We currently called out 100v (valve grade balls) but there does not seem to be a specification for valve grade balls. We require a 3 Rma surface finish, with a...
  16. falcon4

    Quick help: Fittings and # number ?

    This list is useless without more information as to the fitting types.
  17. falcon4

    stainless valve balls

    We will investigate the capabilities of Ballco. Due to the quantities and end use, a smaller well qualified regional supplier will be our choice. Thanks for all the feed back. Gary
  18. falcon4

    Solution for identifying missing components

    The big question is: Do you want to identify a missing part during assembly or check to see if an assembly is short on parts after assembly? And is it built by one individual or along an assembly line or cell. Weighing the finished item is fine, unless the smallest clip weighs less than the...
  19. falcon4

    Pipe thread engagement?

    Machinery Handbook gives a good description of desired engagement. Keeping in mind variation in parts from various suppliers, conditions of threads, amount, if any, of thread tape, and the operator threading the fittings together. Check ANSI B2.1 if you have access. Also be aware of the...
  20. falcon4

    stainless valve balls

    I appreciate all the feedback. I must clarify my submition. I am looking for a manufacturer of the actual "ball" component of a ball valve. We manufacture aerospace valves and this ball is incorporated in our designs. I am looking for a new supplier to manufacture these flow balls for...

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