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  1. SVanden

    Is odd better than even?

    Odd is better in wheel design/manufacturing. By not having an even number of spokes, any distortion from sub-par heat treat and quench, and stress relief after machining is reduced. When i was in the industry, I justified it as "off-axis stress in cornering fatigue" to my counterparts, by...
  2. SVanden

    Milling carbon filled UHMW

    We tried a cool tube about an hour ago, and it worked just fine. Thanks
  3. SVanden

    Milling carbon filled UHMW

    I'm looking for any suggestions on milling carbon filled UHMW. The problem we are having is that the chips aren't clearing, and just "fuzzing" up. Using a 2 flute 0.218" dia ballnose cutting 0.046" dp with the tip, our max spindle speed is 5k and thats where we are running. I think the main...
  4. SVanden

    Aluminum wheel finishing

    Heres a decent forum for finishing. http://www.finishing.com/ svanden
  5. SVanden

    6061 stress relief time

    To anneal any 6061 we heat it to around 985° F throughout, then slow cool down to 500° at 50°/hr. You may need to use a 6XXX series filler, then anneal the assembly, then heat treat it thru T-4 and T-6 cycles. T-6 is 350° for 8 hrs, so cycling from ambient to 415 and back multiple times may be...
  6. SVanden

    1010 CQ STEEL SHEET CHEM. COMPOSITION

    We recently received a chemical composition report on 1010 steel we are using in one of our products. All of the element wt %'s are within spec, but there is also 0.010% Si, and 0.056% Al, which are not specified. The remainder of 99.385% Fe is also in spec. What impact will these additional...
  7. SVanden

    Airless Tires

    NASA Tech Briefs just had a short piece on them. The spokes are a deformable polyurethane.
  8. SVanden

    Cleveland press question

    Does anyone have any info regarding old Cleveland presses? Our company has in storage what we believe to be 150 Ton OBI, and the number is 13-I-150. We are assuming that the 13 is stroke in inches, but we want to know for sure before we design/build tooling and pull it out of storage. And...
  9. SVanden

    FORGING ZK60F MAGNESIUM

    We are researching forging prototype parts with ZK60F magnesium. Does anyone have any specs for this? ie: 1 - Die temperature range 2 - Billet pre-heat temperature 3 - Strain rates and flow stresses vs 6061 alum 4 - Forging lubricants to try, and temp 5 - Cooling rate after forging 6 - Heat...
  10. SVanden

    6061-T6 VS 6061-T651

    What is the difference betwee 6061-t6 and 6061-t6511? Is t6511 extruded, then solution heat treated and artificially aged vs cast and heat treated for t6? Thanks Shane
  11. SVanden

    Natural Gas Process Heating

    We are looking into converting from LP to Natural Gas to heat tooling. We currently use 6-8 large "Weedburner" torches burning LP. In the past, natural gas was experimented with here, rings were fabricated from Ø1" black iron pipe, rolled to approx Ø28" dia, and drilled and tapped with...
  12. SVanden

    ZK60A-T6 Mag...Fatigue properties

    Hello Anyone out there have any fatigue specs for ZK60A-T6 Mag? Endurance limit, and/or a good s-n curve would be great. Thanks Svanden
  13. SVanden

    6061 forging stock Ti composition

    We buy 6061 forging stock, and a vendor is specifying 0.05% max Ti. Our in-house spec calls out 0.05-0.15%, and the ASM handbook calls out .15%. I know that the Ti helps with grain refinement, but to what extent? It also helps by reducing problems associated w/overheating, doesn't it? Will...
  14. SVanden

    MATERIAL F-1.2379

    Thank you, sir
  15. SVanden

    MATERIAL F-1.2379

    We have had tooling designed and fabricated in Spain, and the material is called out as F-1.2379 HRc 60-62. Is this D2?? Thanks Svanden
  16. SVanden

    Aluminum Connecting Rods - do they last

    1) 190°F is fine for 6061. It starts artificially aging around 350°, so 190 will cause no problems. 2) "n" is number of cycles, and the ASME eqn I found used the standard fatigue endurance limit of 14 ksi for 1,000,000 cycles (thats the +14 in the eqn). Wheel testing max's out @...
  17. SVanden

    Aluminum Connecting Rods - do they last

    For analysis of alum. wheels, I've used an eqn' from ASME of: S = (202.3/sqrt(n))+14 (ksi) to get an endurance limit for 6061-T6. For FEA, I try to keep von-Mises less than 80% of this value (compression or tension). Higher operating temps would reduce this, how hot will it get? Shane

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