Wilson 1PR Hardness Tester

[imill3567]

When tripping I just bump the lever and keep my fingers away, let the weights free fall on their own.

I will take a photo of the dashpot and post. All the instructions I have found are for the testers with the trip lever in the base, but ours operates just the same.

With hard specimens like knife blades we are using the diamond penetrator and all three weights, reading is on the black C scale.

How To Operate The Rockwell Hardness Tester

1. Move the crank handle to the forward position.

2. Select the proper indenter/penetrator and insert it in the plunger rod receiver.

3. Place the proper anvil into the elevating screw.

4. Select the proper major load by adding or removing weights.

5. Place specimen on the anvil.

6. Raise specimen into contact with the penetrator by turning the capstan handwheel clockwise. Continue turning until the small pointer is near the black dot. Continue until the long pointer is in a vertical position . The minor load is now fully applied.

7. Set the dial to zero. Adjust the dial gage until the zero set line is aligned behind the long pointer.

8. Push back on the load release handle to apply the major load.

9. When the long pointer comes to rest, within 2-3 seconds, return the release handle to itsw forward position. This removes the major load.

10. In this step you will obtain your reading. Record the Rockwell number that the long pointer is pointing to. The C scale is black and the B scale is red.

11. Remove the minor load by turning the capstan handwheel counter-clockwise. Lower the elevation screw so the specimen clears the penetrator.

12. Remove the specimen.

Ahhh that’s what I was missing I was turning that handle through it’s entire rotation I’ll try letting it free fall and adjust the dash pot accordingly. Thanks for all the help with this tester.

 

[Altamaha]

Leave some airspace when filling the dashpot. Too much oil and it will seep out of the breather hole

 

[imill3567]

Yeah I had filled it up to about 3/4” below the top so it wouldn’t get pushed out. Thanks now I have it set so I can just nudge it and it takes the recommended time to fall. Granted it didn’t change my readings but now I know everything is set appropriately, thanks again.

 

[Altamaha]

They are cool machines. Designed in 1920 by a gear maker (Rockwell) that needed a better way to measure hardness of the gears he produced. Wilson was a salesman that joined the firm and designed improvements and took out the patents in 1930.

Sort of an everlasting design, take care of the machines and they last forever. Mine is 80 years old!!!

If you want the full patent writeup along with drawings google the US Patent number on the nametag. I printed it and filed it with my instruction manuals.