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3rd May 2017, 10:13 PM #16Bushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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3rd May 2017 10:13 PM # ADSGoogle Adsense Advertisement
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3rd May 2017, 10:19 PM #17
Matt
That should read what was next? I have just packaged up this afternoon these two. A Disston No.12 (12ppi)
P1020813.JPGP1020814.JPGP1020820.JPG
It's a lotta teeth I can tell you on a 26" saw, but a beautiful handle.
and Simonds No.371 (9ppi)
P1020822.JPGP1020823.JPGP1020827.JPG
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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3rd May 2017, 10:21 PM #18
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3rd May 2017, 10:27 PM #19
So what is next?
Well, no more saws for the moment, at least not as far as restoration is concerned, but the 18" Kenyon styled saw at the beginning of this thread I am going to use as a test bed for a hammering test. I have been following Rob Streeper's thread on saw hardening and plan to subject the "Kenyon" saw to a right old hammering.
I don't have the equipment for hardness testing, but I think that this technique may serve to stiffen the saw plate. I propose to hang the plate over the end of the bench, attach a weight and then measure the deflection. Then I will hammer the saw in the manner determined by Rob and measure the deflection again. What do you folks think will be the outcome? (Yeah, yeah, I appreciate that the plate will bend).
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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3rd May 2017, 10:38 PM #20Bushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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3rd May 2017, 10:42 PM #21
I haven't read all of Robs Streeper stuff and I'm tired and it's late well for me anyway.
But if you are going to hammer the plate to harden it.
You will also make it more brittle not a good thing.
In a saw especially.
Or are we just hammering the plate to bring some stiffness to it.
Confused Matt
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3rd May 2017, 11:08 PM #22
Yes Matt.
Hammering for stiffness. I think that brings some hardness with it. My limited understanding of such things is that in expanding the molecules some degradation occurs as well as stiffening and hardening. I think there has to be a balance there somewhere. I'm hoping Rob will step in here, but I know he is snowed under (is that possible in Texas?) with a work project.
If the object were just to make the plates harder I think that could have been accomplished by the early manufacturers by heat treating. My conjecture therefore is that it is to introduce stiffness to the plate. Of course I could be up the wrong tree here.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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4th May 2017, 12:53 PM #23
I think that by 'tensioning' the ancients really meant 'adjusting the tension'. I haven't been able to detect any change in static sag - I think I posted on this subthread somewhere about it.
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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5th May 2017, 10:47 PM #24
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6th May 2017, 01:43 AM #25
Grains, which are crystalline in nature, not molecules. The various atoms that make up solid metals and metal alloys arrange themselves on cooling from the liquid state into regular ordered structures known as grains. There are no covalent bonds of the types that make up organic molecules present in metals. The molecules Matt refers to are less suitable I think.
In the process of cold mechanical working of the metal the grains are distorted which changes the bulk properties of the metal. I've found that cold working 1095 steel tends to increase the measured hardness by about 4%, even in areas that are adjacent to those that are struck. This strain hardening was first reported by Bauschinger in the latter part of the 19th century. https://en.wikipedia.org/wiki/Bauschinger_effect
You may recall a while back that I'd done an experiment with heat treating a 1095 saw blade that had been cold-worked. I took some measurements the other day and the increased hardness remains but the standard deviation of the hardness is very low. I need to do some comparative measurements yet but I think I've re-discovered how to do another of Disston's 13 points.Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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6th May 2017, 06:01 AM #26GOLD MEMBER
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Paul,
Great saw. I love the Tulip Oak handle. I've only ever seen that wood one other time, and it, oddly enough, was also a saw handle which had been made by IanW. I missed this original thread I believe. The panel saw is also great.
Looking forward to the next one!
Cheers,
Luke
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6th May 2017, 06:04 AM #27GOLD MEMBER
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6th May 2017, 12:36 PM #28
Paul,
If you're interested in an excellent superficial hardness tester I can recommend this: Portable Ames Model 2S Precision Hardness Tester Rockwell w/ Accessories | eBay
$800 is a good deal relative to the regular price. Just the ticket for quantitative analysis of your hammer tensioning results. Maybe you could make an offer?Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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7th May 2017, 12:03 AM #29
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7th May 2017, 01:39 AM #30
What are you saying?
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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