Old Wilson harness tester weight arrangement
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  1. #1
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    Default Old Wilson harness tester weight arrangement

    With all this home time available I'm going thru all the back burner projects. I have a very old wilson hardness tester thats been gathering dust for years and 150 100 60 45 and 30kg weights, but no hangar, and I don't even know if the weights are the ones that came with the tester. I'd like to put it back in service. None of the weights I have have a hole in the back for the hangar rod, but all of the hangar rods I've seen on the interwebs already have a 60kg weight attached. So what was the setup for my weight set? If I make a simple hangar that just fits up under the 60kg weight I have is there enough leeway to ballpark calibrate with material of a known harness? I have the weights with a flat on one side like the photo:
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    First - don't be surprised if your post is moved to the Metrology Section. Hardness tester weights have been discussed there every couple of years. The first weight with the hardware to hang all the weights is 1852 grams per my non-calibrated scale. The other two are 1/25th of the weight listed on the weight. For example your 60kg weight will actually weight 2400 grams. The first one is different because of the internal hardware already gives some weight - it's explained in earlier posts. For the red HRB you need a ball indenter and 100kg in weights (60 + 40) and for the black HRC you need a diamond indenter and 150 kg (60 + 40 + 50kg weights).

    Measure the actual weights of your weights. some of the sets list the total stacked weight and not the individual weight. The 45 and 30kg weights you have are likely from a superficial hardness machine - not the machine you have. The superficial hardness testers add weights in 15kg steps.

    Dave G.

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    Thanks, wasn't sure whether to post there or here. In any case thanks for the info on the hangar and what the actual weights are, so now I can make a hangar. There is a chart on my machine that shows 15, 30 45 60 100 and 150 kilo weights; I need to post a better photo of the entire machine but this is the chart plate (attached)- does this mean I have a superficial tester? From what I've read the only difference between a superficial and regular machine other than the extra weights is the initial 3kgf vs 10kgf initial force, and the calculation based on the indentation depth, is that true?
    Also for example the ball indenter with 100kg the actual total hanging weight (all up weight on the machine hanger) would be 4kg then, correct?
    thanks
    tom
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    Last edited by tomjelly; 04-01-2020 at 08:26 AM.

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    How about pics of you overall machine? I have a Wilson Jr hardness tester and a manual for it that I found online a few years ago. Wilson machines are still manufactured under Buehler ownership and might be some help in identifying their machine.

    As for things to test that might confirm proper function I have found hot roll 1018 to be reliably around 10 Rc and 4140PH to be reliably 28 to 32. Decent generic parallels probably will be around 60. I have not measured my Kurt vise jaws, but I would bet they are reliable and are 60ish. Hmmm, what else in common circulation that is likely to be well controlled?

    I do have original Wilson calibration discs for mine so I know it is working correctly. If you are desperate, measure a few coupons and send them to me and I could let you know what I get.

    Denis

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    That appears to have both superficial and standard scales, you must have a dual tester that does both. Is there a model number nameplate on it? I've never had one of those, can't help with how they are equipped.

    I need a 15 or 30 Kg weight for mine, if you get an extra you'd like to part with.


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    Here are pics of the plates on mine.

    img_6505-1-.jpg


    img_6504-1-.jpg


    Denis
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    I have 2 units here, a 4JR and the one I posed first which has 3 TT BB in the spot where the model number usually is; maybe that is the designation for a dual tester? The operating lever is at the top rather than the bottom as I always see and where it is on the 4jr I have. Both are pretty rough but I may as well put them both back in service now that I know the mystery of how the weights are set up. Photos attached, first photo is the one that has the smaller weights listed on the data plate, second is the 4jr, 4jr is on the left
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    more pics. The one that is not the 4jr has the unpainted weight hangar (1st photo) with the 2 sided pin hangar, its hangar bar has a small round tray that looks like a small weight could be added there as well. The weights are only able to be stacked from right to left with the 30kg on the bottom, and the bottom of the 30kg weight is shown in the last photo. So how does this weight setup hang from the double sided pin hangar? or do I have weights that are not originally intended to be used with EITHER machine? The weights are 30kg = 1.3 lbs, 45kg = 1.3 lbs, 60kg= .7 lbs, 100kg = 3.52 lbs, 150kg= 4.39 lbs

    30/45/60/100/150 will only fit in that order


    30/45/60 together = 3.34 lb.
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    Your weights are labeled so the top weight shows the total for the stack. The one labeled 150 kg weights about 2000 grams. Multiply that by 25 and it equals 50kg. Most of the common machines read Rockwell A, B, and C. The load for those readings in order are 60Kg, 100Kg and 150Kg. So you start with the first set which is less than 60Kg (2400 grams) because of internal hardware. The second weight is labeled 100Kg but will add only 40Kg load and weigh 1600 grams. The third weight labeled 150Kg will make the whole stack apply 150Kg. It only adds 50Kg force and actually weighs 2000 grams. The smaller weights work the same except for a superficial machine. I expect your 3 tt bb tester had a hanger for the regular scales and a second for superficial. But I'm guessing here - I have a regular and a superficial, not a combined tester.

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    OK so my plan is to make a hangar weighing enough to make the whole 150kg stack add up to 6kg, (150/25) as it would be short that amount as it stands.

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    Sorry. but your hanger will be too heavy.

    The first weight only weighs 1852 grams even though it is labeled 60Kg. Saying it differently, you'd think the first hanger should weigh 2400 grams, but it doesn't. It weighs only 1852 grams. So subtract 568 gram from the 6k you're planning and your hanger stack should weigh ~5430 grams - or a little less so you can add lead to sneak up on the correct weight.

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    Will do. I'll have plenty of leeway in either direction when I'm close


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