brianbrazealblacksmith Posted January 31, 2010 Share Posted January 31, 2010 Here are some tools made from jack hammer bits that the Alabama group had access to. Quote Link to comment Share on other sites More sharing options...
welder19 Posted January 31, 2010 Share Posted January 31, 2010 Cool. I have a pile of jackhammer bits I've been collecting, probably 15 or so. I've used a couple to make a hot cut hardie and a couple punches, I really like using them. welder19 Quote Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted January 31, 2010 Share Posted January 31, 2010 The chipper steels shown (usually 13/16 or 7/8 round with a round or oval collar) are mostly made of 9260, key word being "mostly". Junkyard steel rules apply. Quote Link to comment Share on other sites More sharing options...
brianbrazealblacksmith Posted February 1, 2010 Author Share Posted February 1, 2010 Grant, what is 9260? I know the material was a little stout to work, not as tough as H13 or S7 but it seemed a little stouter than 4140 and 5160 of the same dimension. I'm talking about the way it yeilds to the hammer. The working ends were no good to use. They had stress fractures in them, but every thing else seemmed to be fine, and the tools have been holding up well. I assume the 60 is the carbon, but what is the 92? Quote Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted February 1, 2010 Share Posted February 1, 2010 It's an AISI steel with a very similar chemistry to S-5 tool steel. Around 2% silicone and .75% manganese and .60 carbon. Nice stuff for tools. Yes, it feels plenty hard under the hammer. I agree, 4140 and 5160 feel pretty similar, but you can tell when you got 9260. Hardens best in oil from about 1650 (nice red-orange). Peacock temper works for most things. Water quench from a little lower temperature often works good too. Better about than the other two. Quote Link to comment Share on other sites More sharing options...
brianbrazealblacksmith Posted February 1, 2010 Author Share Posted February 1, 2010 Thanks, Grant. I'm sure the Alabama group will be glad to know, also. They have access to alot of it. Quote Link to comment Share on other sites More sharing options...
Sukellos Posted February 2, 2010 Share Posted February 2, 2010 Grant: Since you are obviously knowledgeable about various alloys. A friend gave me a bunch of "digger links" . These are 5/8" dia. rods that come from the digging part of a potato harvester. (Yeah, he's from Idaho!) They seem to be tough and will harden quite hard in water. They make nice chisels, punches and the like. I have a bending dog that I use that is just a length of the rod with the link end left as it comes from the factory. Can you speculate on the alloy? Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted February 2, 2010 Share Posted February 2, 2010 Potato Digger Links: Old ones 1080 new ones 5160 is what I was told last Quad-State I went to. Quote Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted February 2, 2010 Share Posted February 2, 2010 Thomas, yeah a lot of older ones are 1078. That's just a high silicone 1980 made specifically for chisels. Most of the manufacturers I work with are using 9260 because most of the foundries specify 9260 and that's where most of the tonnage in these tools goes to. Quote Link to comment Share on other sites More sharing options...
Sukellos Posted February 2, 2010 Share Posted February 2, 2010 Thanks guys! I'm going to say that they're old ones. I'll look up the specs and, this'll be a first, I'll have a clue what I'm whaling on. Quote Link to comment Share on other sites More sharing options...
Nakedanvil - Grant Sarver Posted February 2, 2010 Share Posted February 2, 2010 Oops, my bad! I thought Thomas was still talking about the chisels. The "digger links" I have no idea on, but that was probably what Thomas was talking about. Quote Link to comment Share on other sites More sharing options...
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