However because of the low melting point of aluminium a better choice would be to use a cobalt drill bit. Aluminum is a soft metal and therefore a standard HSS drill bit will be able to drill into it. Cuts like a red hot branding iron thru a block of lard. Otherwise the melting aluminum will stick to the drill bit. Today I run some tools with a Black Diamond film. FOR SALE This set originally held 10 bits, but 2 are missing. Completed with chrome-vanadium finish, these star bits eliminate the risk.
#COBALT DRILL BITS SEARS PROFESSIONAL#
I work with NuCut daily ( management taking the cheaper short term way out.)įor the home workshop user - tapping fluid or black oil ( can be bought at plumbing supply to cut pipe threads with a die ratchet.) is the best choice.Īnd those drills with a Gold coating are Titainium Nitride - it was the hot ticket almost 20 years ago. VINTAGE CRAFTSMAN PROFESSIONAL 8 Piece Drill Bit Set USA SEARS -PLEASE READ DESC - 11.95. Durably manufactured of steel, this assortment of tools is tailored for long-term use.
#COBALT DRILL BITS SEARS FREE#
For steels including free machining stainless I would up the mix to about 10%. On hand operated equipment variations in tool pressure and feed rate can cause thermal shock of the cutting edges and cause the tool to wear much faster.Ī water soluable oil at about a 4% mix is a good coolant for Aluminum. Water is not a proper coolant/lube for drilling. I just didn't trust the opinion of some idiot that thought the color had anything to do with the performace of a drill bit.Īnybody use the Zirconium or Titanium coated drill bits? I am going to a build part on Saturday and I don't want to experiment on a limited timeline but I have never really tried these so perhaps they would work.Īs someone with a degree in metalurgy, who works doing tool and die work. So, I didn't waste my money and I am going to go to another sears tonight to get me an extra COBALT drill bit. it's the yellow color that keeps them cool I was about to buy one and give it a try when the next words out of his mouth was. Well, he indicated that the Zirconium drill bits were better as they remain cooler. The guy in the hardware area asked why I needed Cobalt and I told him I was drilling through some hardened alloy Steel and I thought cobalt was the best there was. 1-48 of 793 results for 'cobalt drill bit sets' Results BOSCH CO14B 14-Piece Cobalt M42 Metal Drill Bit Assorted Set for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum 4,548 1K+ bought in past month 3397 List: 144. I was at Sears last night to try to get a replacement (or supplement) to my trusty 5/32 Cobalt drill bit for AK work and they were all out.
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