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Recent content by dbooker630

  1. dbooker630

    Learning How to Type

    Eighth grade typing from 1973 was one of the most useful classes in school. The manual typewriters in the classroom had blank keys. A large keyboard picture with keys identified was posted on the wall at the front of the classroom. So we put our fingers on the home keys and kept our heads up. It...
  2. dbooker630

    STEEL GRADES WHICH DOESNOT REQUIRES TEMPERING

    You could also add an induction tempering step to your recipe to ensure uniform case hardness.
  3. dbooker630

    Planetary Gear Material- 9310, any tool steel viable?

    Ring gears and pinions made from 9310H can be carburized and finish ground. This grade is used for racing applications.
  4. dbooker630

    ASTM E140 vs. ISO 18265 - preference?

    The metallurgists in our company are discussing the two standards as to which one is more suitable. One of our engineers checked a Brinell test block with HRC and the ISO conversion is closer than the ASTM document. I'm interested in the Eng-Tips community's thoughts on these standards.
  5. dbooker630

    Asphalt resurfacing vs. sealcoating issue for HOA

    Thanks. We meet with the homeowners this Saturday.
  6. dbooker630

    Asphalt resurfacing vs. sealcoating issue for HOA

    Thanks for the responses. I am in western NC, not much as far as freeze/thaw is concerned.
  7. dbooker630

    Asphalt resurfacing vs. sealcoating issue for HOA

    Hello, I'm normally in the Metallurgy forum but I am dealing with an issue with my HOA. We just formed the association to deal with the deteriorating roads in our subdivision. The roads are 20 years old and have never been resurfaced, just numerous patches throughout. We are getting quotes for a...
  8. dbooker630

    JIS Spline Standards

    Here are a few JIS documents available through TechStreet.com: JIS B 0006:1993 Technical drawings -- Representation of splines and serrations (pdf $68 USD) JIS B 1601:1996 Straight-sided splines for cylindrical shafts with internal centering -- Dimensions, tolerances and verification (pdf $68...
  9. dbooker630

    Is it normal for engineers to get pulled to work production

    Earlier this year due to a shortage of workers in our area, the corporate office sent several engineers to the plant to work the assembly lines, until enough workers could be hired. A one-time deal, perhaps an after-effect of the pandemic. It was actually helpful to many of the engineers, who...
  10. dbooker630

    How accurate is hardness testing to determine depth of HAZ?

    ASTM E340 and E381 are the relevant standards for macroetching. You can purchase on techstreet.com; a PDF of E340-15 costs $56 USD, PDF of E381-22 costs $54 USD.
  11. dbooker630

    Abnormal growth after Induction Hardening Process

    Have you tried changing out your inductor? Also have you checked consistency of your power supply?
  12. dbooker630

    iso violation question

    The drawings at our company specify 0.4mm for two-place decimals, or 0.015". There also is a disclaimer in our title block 'UNLESS OTHERWISE SPECIFIED.' I would add a tolerance adjacent to the 275.75 dimension on the drawing, which would account for the tape measure capability.
  13. dbooker630

    4340 transmission output shaft

    Steps are always an issue with induction but they can be worked around through a series of dwells and power adjustments throughout the scan. But development time would be required. In your case a single-shot coil would be preferred. Depending upon the size and length of your part a single shot...
  14. dbooker630

    4340 transmission output shaft

    If you can deal with some finish grinding or turning I would first furnace heat, hot oil quench & temper the shaft. Then follow the furnace heat with induction hardening and tempering to the same surface hardness but with up to 0.300 effective case depth (to 50 HRC).
  15. dbooker630

    Offerring gear material

    The report above shows carbon as 2.47%. If this is an accurate result this is neither a carburizing grade nor would it be steel that has already been carburized. I would not trust this test report, suggest a destructive test as mfgenggear recommended.

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