Wilson Hardness Tester Calibration

[Cypress Creek Knives]

Good Evening all,
I picked up a Wilson 4 OUR GN hardness tester today and it needs calibrated. Currently it is reading 7 points low. I have searched high and low and cannot find any instructions on how to calibrate this tester. I have flipped through this manual, but didn't see anything on calibration.

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amet-me.mnsu.edu

Does anyone know where I can find information on the calibration process?

 

[DevinT]

Good Evening all,
I picked up a Wilson 4 OUR GN hardness tester today and it needs calibrated. Currently it is reading 7 points low. I have searched high and low and cannot find any instructions on how to calibrate this tester. I have flipped through this manual, but didn't see anything on calibration.

Loading…

amet-me.mnsu.edu

Does anyone know where I can find information on the calibration process?

Do you have test blocks? You might need a new indenter. Make sure your oil reservoir has oil.

Then you adjust the speed of the dash pot.

A low reading usually means it’s too fast or a damaged indenter.

Hoss

 

[Cypress Creek Knives]

Do you have test blocks? You might need a new indenter. Make sure your oil reservoir has oil.

Then you adjust the speed of the dash pot.

A low reading usually means it’s too fast or a damaged indenter.

Hoss

I have a test block and a good indenter (I took the indenter off of my other hardness tester).

I'll check the oil level and then adjust the speed from there.

 

[Taz]

I have some old manuals that talk about calibrating Wilson testers I can send you. I reached out on Instagram to you so I can attach the files!

 

[Ken H>]

I seriously doubt adjusting the speed will be enough for 7 points. Pull the top off and look at the pivots and location of screws compared to your other hardness tester. BTW, what is your other hardness tester - would it happen to be a HR-150 or one of the clones? If so I've posted a pretty decent write on calibrating those in the past. You might work out how to calibrate the wilson based on the HR-150 calibration.

 

[Taz]

Dash pot speed is one of the things to check. I drove mine home and had to adjust the dash pot speed, then the dial/gauge, but got it to read pretty much dead on the calibration blocks and other blades I had professionally heat treated!

 

[Cypress Creek Knives]

I have some old manuals that talk about calibrating Wilson testers I can send you. I reached out on Instagram to you so I can attach the files!

Thanks! I'll check my instagram!

I seriously doubt adjusting the speed will be enough for 7 points. Pull the top off and look at the pivots and location of screws compared to your other hardness tester. BTW, what is your other hardness tester - would it happen to be a HR-150 or one of the clones? If so I've posted a pretty decent write on calibrating those in the past. You might work out how to calibrate the wilson based on the HR-150 calibration.

The other hardness tester is a Wilson 6jr. My assumption is that most hardness testers calibrate the same way, but I could be way off.

 

[Taz]

If it was transported, the guage/dial itself can be off. That's what mine was; I had to correct the gauge itself after I drove the tester home. Mine is an older JR1 I picked up for $325 and was around 2 hrc off after I got a new indenter for it for $20 on the Big River site. I adjusted the dash pot and got closer, but the movement/vibration from driving it home in my car meant the gauge needed tuning. I have some older manuals as zip files if anyone needs them! They are manuals for: Wilson Early Models, Wilson 3R, and Wilson JR/JS models.

 

[Taz]

Its the Index Lever Adjustment on pages 9-11 on the manual you linked and page 17, dial adjustment. Lots of little things to check on those if they have been sitting! Could be old or too thick/thin oil in the dashpot as well.

 

[tobydog]

If it was transported, the guage/dial itself can be off. That's what mine was; I had to correct the gauge itself after I drove the tester home. Mine is an older JR1 I picked up for $325 and was around 2 hrc off after I got a new indenter for it for $20 on the Big River site. I adjusted the dash pot and got closer, but the movement/vibration from driving it home in my car meant the gauge needed tuning. I have some older manuals as zip files if anyone needs them! They are manuals for: Wilson Early Models, Wilson 3R, and Wilson JR/JS models.

What is the site you got the indenter from?

If it was transported, the guage/dial itself can be off. That's what mine was; I had to correct the gauge itself after I drove the tester home. Mine is an older JR1 I picked up for $325 and was around 2 hrc off after I got a new indenter for it for $20 on the Big River site. I adjusted the dash pot and got closer, but the movement/vibration from driving it home in my car meant the gauge needed tuning. I have some older manuals as zip files if anyone needs them! They are manuals for: Wilson Early Models, Wilson 3R, and Wilson JR/JS models.

 

[Taz]

BigRiver/A, they are on ebay as well.