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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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drill bits
i in the middle of a project for my company ,but having small problem
with drilling through 1/4 inch steel. my question is what is the best type of drill bit to use for boring thru the side of a forklift? |
#2
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drill bits
The 1/4" steel might just be an pre-hardened BHN of 400-500. Normal drills
won't do it. I cut AR400 with a plasma and just cutting HRS with a drill after pre-cutting with a torch - is rough. Hardens the metal. If it is a hot job - like now - try a cement drill. If it can wait for a drill - buy a 1/4" carbide centering drill or pilot drill. Carbide made for metal - you can get that drill red hot - and the metal and the drill continues or starts cutting. Slow cool and it is ok. Another method - friction heat. Put a short length of drill rod and round it over with a file - and then use it to heat a spot. Get the spot red. Cool slow. Then drill with a good HS steel drill. Since the sides get banged a bit - that is likely pre-hard high BHN. Martin Martin H. Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net TSRA, Life; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal. NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member. http://lufkinced.com/ thirst4knwldg wrote: i in the middle of a project for my company ,but having small problem with drilling through 1/4 inch steel. my question is what is the best type of drill bit to use for boring thru the side of a forklift? ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#3
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drill bits
thirst4knwldg writes:
i in the middle of a project for my company ,but having small problem with drilling through 1/4 inch steel. my question is what is the best type of drill bit to use for boring thru the side of a forklift? And, ummm, why are you drilling through the side of a forklift? How big a hole? I assume you're using high speed steel now with no luck, so the next step up is cobalt. Also, make sure you're using a drill motor that's got enough speed and torque for the job. Battery-powered drills are wonderful, but serious work requires a cord. |
#4
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drill bits
Martin H. Eastburn wrote:
Another method - friction heat. Â*Put a short length of drill rod and round it over with a file - and then use it to heat a spot. Â*Get the spot red. I tried that trick several times, but only failed. What's the trick behind the trick? Nick -- The lowcost-DRO: http://www.yadro.de |
#5
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drill bits
Nick Mueller wrote:
Martin H. Eastburn wrote: Another method - friction heat. Put a short length of drill rod and round it over with a file - and then use it to heat a spot. Get the spot red. I tried that trick several times, but only failed. What's the trick behind the trick? Nick I've used that trick to drill a hole in bandsaw blade stock, but we just used a plain old common nail. My understanding was that it combined annealing the spot, along with 'sucking' a bit of the carbon outta the saw blade into the lower carbon steel nail. Not sure if that's why it worked, but it did. Pete -- Pete Snell Department of Physics Royal Military College --------------------------------------------------------------------- That's a very elaborate story, but where have you REALLY been the last three days? Jonah's Wife, sometime BC |
#6
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drill bits
"Pete Snell" wrote in message ... Nick Mueller wrote: Martin H. Eastburn wrote: Another method - friction heat. Put a short length of drill rod and round it over with a file - and then use it to heat a spot. Get the spot red. I tried that trick several times, but only failed. What's the trick behind the trick? Nick I've used that trick to drill a hole in bandsaw blade stock, but we just used a plain old common nail. My understanding was that it combined annealing the spot, along with 'sucking' a bit of the carbon outta the saw blade into the lower carbon steel nail. Not sure if that's why it worked, but it did. I'd be skeptical about the nail sucking out carbon, unless your nails really suck to begin with. But the technique works well on plain-carbon and case-hardened simple alloys. On slower-quenching alloys it may not work at all. It may, in fact, make things worse. This is a common gunsmith method for drilling holes for a 'scope mount on vintage Springfield '03 receivers. They were case-hardened and harder than the hammers of hell. -- Ed Huntress |
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