I want to begin with telling you this chapter was loaded with great technical information. I recommend finding a copy for your personal library just for this chapter. I'm going to give a quick over view of what you can expect to find.Then I'll share some of the technical data. Because this topic has so much information it will take a few times for me to edit this post to put all the info here. So until I remove more to come at the bottom of this post I'll be adding to it in a few days.
I want to inform you there's a link on the home page to a website for easy reference that match similar steels from other manufactures the steel manufactured by Carpenter Steel Co. and used to write about the spark test. This paragraph also links to that page.
After a quick introduction they write about the proper way to use a grinder. From R.P.M to the diameter of the grinder and the grain size of the abrasive material. Here are a few bullets form this section.
The effect of wheel speed
The effect of wheel grain size
Dressing the wheel
Preparing the sample
Hardened vs. annealed tool steels
How hard to press
Where to make the test
How long does it take to learn?
Picture of the sparks.
Then it goes into the characteristics of how each element sparks
For example: "Carbon. Causes bursts---the higher the carbon the more plentiful and complicated the bursts, (see No. 11 Special) except in steels containing appreciable amounts of alloys, (see speed Star and T-K).
You'll find description on the following elements.
Keep the fires burning hot!
Another example: Chromium. Suppresses the stream and the burst---imparts an orange color.
Disclaimer; not used to analyze the steel.
Following this is a description of each steel they manufacture by name and the details of how it sparks. They separate oil harden and air hardened steel as well. Those details are separated into color, carrier lines, length of lines, ends of lines and star bursts. There are also diagrams on how the sparks are thrown off of the grinding wheel including the size and volume and how the sparks wrap around the grinding wheel.
The final Instruction tells you not to look at the sparks as a whole. Instead to pick out the details one by one. The most important feature is the end of the carrier line. Once you are trained to see how the ends vanish then the other details will be easier to distinguish. They even give a comparison of two different steels that made me feel like they we're describing fireworks exploding.
The final paragraph lets you know what a spark test can and can not do. But if you have a few known steels around then you need to test an unknown you're more able to quickly draw a conclusion to what you might have.
This book is on eBay for a few bucks.
I'll try to post a picture of the diagrams soon. Now that I have this up, I'll try to post more details on the bold bullets above later.
To book review
2020 ABANA Conference in Sarasota New York. June 3rd. through June 6th. Plan now!