CNC Molds N Stuff Posted October 2, 2015 Report Share Posted October 2, 2015 What can you deduce about graphite from this picture? Both weights shown were cast in the same cavity of the same mold. The lead was the same temperature for both. Quote Link to comment Share on other sites More sharing options...
smalljaw Posted October 2, 2015 Report Share Posted October 2, 2015 What does graphite have to do with it? Quote Link to comment Share on other sites More sharing options...
Basseducer Posted October 2, 2015 Report Share Posted October 2, 2015 The one on the right looks like it was poured at a slower flow rate. I don't know that graphite was a factor. Quote Link to comment Share on other sites More sharing options...
Salty's Posted October 2, 2015 Report Share Posted October 2, 2015 It as a high expansion rate or at least looks like that in the picture. Those weights don't look the same. I'm assuming the smaller was poured first and the larger poured second. Quote Link to comment Share on other sites More sharing options...
Apdriver Posted October 3, 2015 Report Share Posted October 3, 2015 What can you deduce about graphite from this picture? Both weights shown were cast in the same cavity of the same mold. The lead was the same temperature for both. Not enough information. What does graphite, lead and molds have in common? Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 They were both poured from a ladle as fast as they would pour. The mold was cool enough to handle both times. Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 (edited) P.S. Salty is kinda sorta on the right track... Edited October 3, 2015 by Bob La Londe Quote Link to comment Share on other sites More sharing options...
JRammit Posted October 3, 2015 Report Share Posted October 3, 2015 Graphite mold?? Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 (edited) Graphite mold?? No. Nothing so esoteric although glass is sometimes cast in graphite molds. I would not have known that except a lady who makes specialty marbles in graphite molds spent time telling me about it a few years ago when she bought some gas bottles from me. Edited October 3, 2015 by Bob La Londe Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted October 3, 2015 Report Share Posted October 3, 2015 (edited) One was a cold mold, the other after the mold was heated. The graphite contains some moisture, driven off after the first pour. Dave Edited October 3, 2015 by Vodkaman Quote Link to comment Share on other sites More sharing options...
Apdriver Posted October 3, 2015 Report Share Posted October 3, 2015 The release agent a lot of us use is mostly graphite, from the looks of it. It does make the pour much easier most times and seems to make lead flow much easier. Just a guess....pour with ridges- no agent. Smooth pour with release agent. Quote Link to comment Share on other sites More sharing options...
Apdriver Posted October 3, 2015 Report Share Posted October 3, 2015 What is that, anyway, Bob? Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 It's a 26oz sinker. Well... one of them is. LOL. Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 If nobody guesses what I think makes the difference I'll try to remember to post my opinion tomorrow. Quote Link to comment Share on other sites More sharing options...
JRammit Posted October 3, 2015 Report Share Posted October 3, 2015 Jug line anchors?? Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted October 3, 2015 Report Share Posted October 3, 2015 Has to be moisture on the first pour. Dave Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 Has to be moisture on the first pour. Dave Could be I suppose, but I don't think so. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted October 3, 2015 Report Share Posted October 3, 2015 Looking forward to your opinion. The moisture idea can of course be tested, by heating the graphite before application, to drive off any moisture or low flash point fractions. Dave Quote Link to comment Share on other sites More sharing options...
Yo Al Posted October 3, 2015 Report Share Posted October 3, 2015 I can deduce that the cavity didn't fill and spraying with graphite made it fill completely. As to why I don't know. Does break it surface tension? Act as an insulating barrier to prevent lead freezing on contact? I never gave it any thought before. Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 One of those things encompasses my opinion. I think the graphite acts as an insulator allowing the lead to flow easily for an extra fraction of a second. FYI: There was almost 3 ounces difference in those two pieces. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted October 3, 2015 Report Share Posted October 3, 2015 I read your post that graphite was used in both castings. DAve Quote Link to comment Share on other sites More sharing options...
Salty's Posted October 3, 2015 Report Share Posted October 3, 2015 Do I get the Hawaii trip? Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 I read your post that graphite was used in both castings. DAve Well I couldn't give you every little detail, because then you would not think about. LOL. 1 Quote Link to comment Share on other sites More sharing options...
CNC Molds N Stuff Posted October 3, 2015 Author Report Share Posted October 3, 2015 Do I get the Hawaii trip? Sure. You have my permission to go anytime you can afford it. Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted October 3, 2015 Report Share Posted October 3, 2015 Bob - you know I like a logic challenge. Thanks for not making me look like an eeejit Dave Quote Link to comment Share on other sites More sharing options...
