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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...

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

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

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.

Thanks. We meet with the homeowners this Saturday.

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

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...

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...

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...

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.

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

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.

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...

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).

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.

If it is casting flaws I suggest purchasing a copy of the ANSI/MSS SP-55-2011 Quality Standard for Steel Castings/Visual Method for Evaluation of Surface Irregularities. The standard contains reference photographs that can be used to develop your internal requirements.

You can expect hardness around 269 HBW (28 HRC) after air cool in this section size.

Thanks! I will continue to use a C diamond for HRC & HRA along with an N diamond for the superficial scales.

I recently had one of my hardness testers repaired and recalibrated. The service person told me that it is now recommended to use an individual HRA or HRC indenter instead of the combination HRC indenter being used for HRC, HRA, and HRD scales. I searched ASTM E18-17e1 for such recommendation...

I still use a classic Franklin Planner to take notes and keep track of what task I happen to be on. They range in size from 3"x5" up to 8.5"x11".