Hardness testing smiple and non destructive type

[SmithDoor]

ry this type simple to use and leave no marks

This even works on lathe beds
I have had mine since about 1980

Dave

http://sunrisegr.com/srt_products_d... Portable Hardness Tester&type=brand&sort=SRT

 

[SmithDoor]

Found this on hardness testing if any needs the info



Dave


The Steel Ball Test:

A test inspired by Robert Bastow when he commented on anvilfire by
saying, "You could bounce a 1" steel ball off the monitor!"
Obtain a steel ball bearing ball (1/2" (13mm) to 1"(25mm)) in
diameter. Drop the ball from about 10" onto the face of the anvil. On
a really hard anvil the ball will bounce about 75-90% of the distance
dropped.

We tested a number of anvils and other items in several shops one
weekend (later adding to the list) and here are the results (no one we
knew had a cheap anvil to test).

* 93% - Peddinghaus 165# Forged Steel Anvil
* 85-90% - KOLHSWA 325# Swedish Cast Steel Anvil 55-57 HRC
* 85% - Black Granite Surface Plate 8" thick
* 80-85% - High quality wrought anvils - Hay-Budden & Peter
Wright (average)
* 65% - OLD 18th Century hornless anvil with 5th foot - about
75 pounds.
* 55% - Worn out old anvil, looks like an old Mouse Hole circa
1800
* 50% - Rail road rail - short section of modern 150# section
* 35% - Colonial Anvil 125# missing horn and worn out!
* 30% - Monel Boat Shafting (50/50 Cr/Ni)
* 25% - 2024-T4 Aluminium (hard, aircraft type)
* 25% - Annealed SAE 4140
* 20-25% - Ductile Iron Swage block
* 20% - A-36 Structural steel plate 8" thick
* 15% - Aged Concrete (Smooth)
* 15% - Milling machine Table (Mehanite)
* 5-10% - Massive cast iron weld platen
* 5% - Red oak log (endgrain)

 

[barnesrickw]

Just ran across this topic and had a question. When testing minerals one of the tests was hardness by means of scratch test. There are indexed minerals of known hardness. If it scratches the mineral being tested, it's lower so check the next one down. Would this work for metals. If you scratch your sample with a known rc52, and it does leave a scratch, it is 52 or lower, move down to the next known?

 

[Scott_M]

They make a file set for just that.
http://www.mscdirect.com/product/de...gle-PLA+-+Test&CS_003=7867724&CS_010=06534309

Scott