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- Mar 26, 2018
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- 8,756
Ah, the end of a four day work week 
=27 days to go.....
I am working on improving my HSS grinding skills to create the perfect threading tool.
This morning I was roughing two pieces of 1/2" HSS at work. First off, I took my 4 1/2" angle grinder and cut off an ugly grind to start over. I was grinding on a piece of, Super M0-Max COBALT, Cleveland OH. Man is this stuff tough!!
I then proceeded to rough the shape as outlined with a sharpie.
The other piece of HSS is from Shars. It's M2, same size.
The difference in grinding time is significant. I thought it would be subtle, it's not.
Maybe this is not a fair comparison? I have some, Rex as well, I assume it is equally tough.
Now I know why batches of old HSS ground blanks are so much money on Ebay. A pile of partially used HSS blanks for $30 now seems dirt cheap.
Apples and Oranges.
McMaster Carr (1) 1/2" X 4" 10 degree bevel- tool blank
PMT15 M2 M42 M48
$37 $28 $32 $62
SHARS M2
$5.70
(Don't point and giggle, I'll clean them up on my DIY Lapping machine later)
From Hudson Tool Steel >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Technical Data » Grade » M42
M42 super high speed steel is a premium cobalt high speed steel with a chemical composition designed for high hardness and superior hot hardness. These properties make the steel an excellent choice for machining high-strength and pre-hardened steels, high-hardness alloys, and the difficult-to-machine, nonferrous super alloys used in the aerospace, oil, and power generation industries.
M42 exhibits excellent wear resistance by virtue of high heat-treated hardness (68 to 70 HRC), and the high cobalt content imparts the hot hardness. As such, the cutting edges on tools made from M42 super high speed steel stay sharp and hard in heavy-duty and high-production cutting applications.
APPLICATIONS: Twist drills, taps, milling cutters, reamers, broaches, saws, knives, and thread rolling dies.
=27 days to go.....I am working on improving my HSS grinding skills to create the perfect threading tool.
This morning I was roughing two pieces of 1/2" HSS at work. First off, I took my 4 1/2" angle grinder and cut off an ugly grind to start over. I was grinding on a piece of, Super M0-Max COBALT, Cleveland OH. Man is this stuff tough!!
I then proceeded to rough the shape as outlined with a sharpie.
The other piece of HSS is from Shars. It's M2, same size.
The difference in grinding time is significant. I thought it would be subtle, it's not.
Maybe this is not a fair comparison? I have some, Rex as well, I assume it is equally tough.
Now I know why batches of old HSS ground blanks are so much money on Ebay. A pile of partially used HSS blanks for $30 now seems dirt cheap.
Apples and Oranges.
McMaster Carr (1) 1/2" X 4" 10 degree bevel- tool blank
PMT15 M2 M42 M48
$37 $28 $32 $62
SHARS M2
$5.70
(Don't point and giggle
, I'll clean them up on my DIY Lapping machine later)From Hudson Tool Steel >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Technical Data » Grade » M42
M42 Super High Speed Steel
M42 super high speed steel is a premium cobalt high speed steel with a chemical composition designed for high hardness and superior hot hardness. These properties make the steel an excellent choice for machining high-strength and pre-hardened steels, high-hardness alloys, and the difficult-to-machine, nonferrous super alloys used in the aerospace, oil, and power generation industries.
M42 exhibits excellent wear resistance by virtue of high heat-treated hardness (68 to 70 HRC), and the high cobalt content imparts the hot hardness. As such, the cutting edges on tools made from M42 super high speed steel stay sharp and hard in heavy-duty and high-production cutting applications.
APPLICATIONS: Twist drills, taps, milling cutters, reamers, broaches, saws, knives, and thread rolling dies.
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