collinb Posted March 19, 2015 Report Share Posted March 19, 2015 What are those odd brass bits in the middle of the second row? Never seen anything like them before. Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 Likely Cobalt, they are usually tin coated. Quote Link to comment Share on other sites More sharing options...
AstroDave Posted March 19, 2015 Report Share Posted March 19, 2015 From what I could determine from a quick google search they are CNC spiral bits... http://www.toolstoday.com/p-6225-solid-carbide-cnc-2d-and-3d-carving-tapered-ball-nose-conical-ball-flat-bottom-end-mill-zrn-coated-router-bits.aspx Quote Link to comment Share on other sites More sharing options...
collinb Posted March 19, 2015 Author Report Share Posted March 19, 2015 tx all. Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 1/2" spiral router bits in 1/2, 5/16, 3/8 and 1/4 – TiN treated HSS... HSS tooling is delivered in is a series of wear resistance coatings --- from less to more: Uncoated HSS or ‘bright finish’, Black-and-Gold, then a series of titanium-based coatings --- TiN, TiCN, TiAIN and a few others that escape me for the moment…Each leave tell-tail colors ranging from purple to yellow… Cobolt tooling is typically delivered in, well... cobalt... Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 1/2" spiral router bits in 1/2, 5/16, 3/8 and 1/4 – TiN treated HSS... HSS tooling is delivered in is a series of wear resistance coatings --- from less to more: Uncoated HSS or ‘bright finish’, Black-and-Gold, then a series of titanium-based coatings --- TiN, TiCN, TiAIN and a few others that escape me for the moment…Each leave tell-tail colors ranging from purple to yellow… Cobolt tooling is typically delivered in, well... cobolt... Tin is more like a ceramic hard coating, increases tool wear resistance. Cobalt cutters are usually coated with Tin especially the cheaper one. Quote Link to comment Share on other sites More sharing options...
Janello Posted March 19, 2015 Report Share Posted March 19, 2015 Colbalt has a dull gold finish. I have a whole drawer full of drill bits at work and sometimes the cobalt is hard to differentiate from the gold tin finish, but those are easily not cobalt...it's never that shiny or yellow. Tin Coated on left. Cobalt on right Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 Agreed... I've got both cobalt and HSS in a variety of coatings... Those look a lot more like HSS/TiN, than Cobalt/TiN or Cobalt/Gold-Ox... Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 Colbalt has a dull gold finish. I have a whole drawer full of drill bits at work and sometimes the cobalt is hard to differentiate from the gold tin finish, but those are easily not cobalt...it's never that shiny or yellow. Tin Coated on left. Cobalt on right Cobalt is the underlying bit material and has nothing to do with color. The gold / yellow is TIN. Cobalt looks just like HSS when naked. Quote Link to comment Share on other sites More sharing options...
AstroDave Posted March 19, 2015 Report Share Posted March 19, 2015 Zirconium Nitride (ZrN) Coated perhaps... Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 The bits that have that pail color are gold oxide. Really doesn't do much and wears off. Really just makes them look expensive. Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 ==>Cobalt looks just like HSS when naked. I’ll go with ‘Like’, but not 'just like'... I know there are different metallurgies, so that could be part of the issue.... But every uncoated cobalt bit I've got tends to be slightly duller/darker/less-bright/whatever – than uncoated HSS…. They just look slightly different – well, for me... Again, could be the metallurgies, or the sample size… But I bet if you scattered a collection of uncoated HSS and uncoated cobalt on a table, you could pick which-is-which… That's why I voted HSS/TiN... And why I siad cobalt looks like cobalt -- was refering to the slightly darker cast of the unfinished shaft... From the small length of visible shaft that remain uncoated, they look more like HSS than cobalt… Course, it would have helped to have a better photo... But then we wouldn't get to have so much fun avoiding real work... Of course we could go round and round – or we could ask the owner of the bits… Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 ==>Cobalt looks just like HSS when naked. I’ll go with ‘Like’, but not 'just like'... I know there are different metallurgies, so that could be part of the issue.... But every uncoated cobalt bit I've got tends to be slightly duller/darker/less-bright/whatever – than uncoated HSS…. They just look slightly different – well, for me... Again, could be the metallurgies, or the sample size… But I bet if you scattered a collection of uncoated HSS and uncoated cobalt on a table, you could pick which-is-which… That's why I voted HSS/TiN... And why I siad cobalt looks like cobalt -- was refering to the slightly darker cast of the unfinished shaft... From the small length of visible shaft that remain uncoated, they look more like HSS than cobalt… Course, it would have helped to have a better photo... But then we wouldn't get to have so much fun avoiding real work... Of course we could go round and round – or we could ask the owner of the bits… I was just guessing just like you. I think the issue was really the coating color that made the OP post the question. I think we can all agree that its likely TIN and the bit itself is a mystery. Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 Ahhh, spoken like a true diplomat… You know anything about nuclear arms? 1 Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 Ahhh, spoken like a true diplomat… You know anything about nuclear arms? Quote Link to comment Share on other sites More sharing options...
Tom Cancelleri Posted March 19, 2015 Report Share Posted March 19, 2015 They are endmills, which have been coated in the blood of King Midas. Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 I've got a couple of sets of drills and a couple sets of mills in black/G-O... Not 'gold-looking' enough to be the King... Looking at the photo again, I may have made a bad assumption... The more I look at the four bits as a set, the more I'm not sure they are a set... I'm 99% the 1/2" is HSS/TiN, but I'm not convinced about the middle two... Those could be cobalt, or maybe HSS in need of a good cleaning... Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 @OP... Oh BTW: The yellow stuff is a coating What the bits are made from and coated with remain in debate until you eMail the owner and ask him/her to settle the matter... Thanks... Quote Link to comment Share on other sites More sharing options...
Immortan D Posted March 19, 2015 Report Share Posted March 19, 2015 Probably zirconium nitride coated bits (used for CNC applications). Quote Link to comment Share on other sites More sharing options...
AstroDave Posted March 19, 2015 Report Share Posted March 19, 2015 Probably zirconium nitride coated bits (used for CNC applications). Am I being trolled Quote Link to comment Share on other sites More sharing options...
dwacker Posted March 19, 2015 Report Share Posted March 19, 2015 I like how he did the bearings. Looks like a good use for old drill bit. Quote Link to comment Share on other sites More sharing options...
Trip Posted March 19, 2015 Report Share Posted March 19, 2015 Yea, I used dowel stock... I certainly could have saved quite a bit of effort using drill bits... Learn something new every day at WTO... Quote Link to comment Share on other sites More sharing options...
Immortan D Posted March 19, 2015 Report Share Posted March 19, 2015 Am I being trolled Nah. I saw your post after sending mine and I was too lazy to edit Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Janello Posted March 20, 2015 Report Share Posted March 20, 2015 @OP... Oh BTW: The yellow stuff is a coating What the bits are made from and coated with remain in debate until you eMail the owner and ask him/her to settle the matter... Thanks... Yeah, that works until the owner starts guessing like the rest of us PB! Quote Link to comment Share on other sites More sharing options...
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