Inexpensive way to drill hard metals.
asterix (Dec 14, 2021), Canyonman44 (Dec 14, 2021), Jon (Dec 16, 2021), nova_robotics (Dec 17, 2021), RetiredFAE (Dec 20, 2021), Sleykin (Dec 20, 2021), Wildwilly (Dec 14, 2021)
Thanks mr_modify1! We've added your Steel Drill Bits to our Drilling and Drill Presses category,
as well as to your builder page: mr_modify1's Homemade Tools. Your receipt:
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
cmarlow (Dec 17, 2021)
I have some carbide drills with inserted carbide bits from Bosch that are intended for both steel and ceramic material. They are very much like what you made, not like the solid carbide drills used for machining metals. Bosch seems to have used a tougher carbide and a higher temperature brazing when they were made. They are quite resistant to chipping or overheating. They are also a bit pricey.
Another style of bit that works well for harder steels are the spear pointed glass and ceramic tile drills, especially with a regrind, but you still have to be careful about overheating the brazing and about keeping an even feed to avoid chipping or fracturing the carbide.
Ha ha ha. I am the kind of guy who can melt drills, even HSS drills. (and I have had carbide masonry drill come apart too). Brazed carbide inserts are funny. You would think something that can hammer its way through rock would stand up to hitting a bit of rebar, but they do not. Not only does the carbide shatter because it is brittle the brazed joint doesn't hold together either. Reshaping the bit to cut like a twist drill bit introduces other problems related to the grade of carbide and the quality of the brazed joint.
It is the same with carbide tipped circular saw blades for wood. You would think the inserts should stand up to a bit of metal but hitting a nail in the wood can take the inserts off of the blade. Yet at the same time I can buy circular saw blades designed to cut steel. Even with those you have to be a bit careful because some are designed for cutting regular mild steel, some are for hardened and cast steel, and some are for different grades of stainless.
Last edited by cmarlow; Dec 20, 2021 at 04:50 PM.
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