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These are either like printed circuit board drills, or similar.? Yes, extremely brittle and designed for use in good quality industrial CNC machines or something that is accurate enough to avoid any side load or tilting.? Very high odds of breaking them if trying to use them by hand in anything like a handheld motor tool or pin vise. But, being used properly, fine for brass or almost anything.? But you need to prevent it galling.? And old machinist trick is to have a small block of beeswax you poke the drill into first.? (And much less messy than oils or cutting fluids.)? However, if not careful, even doing that will break them if you don't push absolutely straight in.? But for normal wire drills, it is a very handy trick. Charles E. "Chuck" Kinzer
On Sunday, March 23, 2025 at 11:33:47 AM PDT, Mike Swederska via groups.io <mikesscale@...> wrote:
Harbor Freight also sells them. Due to breakage I only use them for plastic never brass.? Mike Swederska? On Mar 23, 2025, at 1:04?PM, Roger Nulton via groups.io <roger.nulton@...> wrote:
Bob, You¡¯re right, those bits are great for avoiding the collet change. I have a small battery powered Dremel that is easy to control that I use them in. They are also very sharp! They are easy to break, but so cheap that it barely matters. I used to get mine at train shows too, but those are nearly extinct now. I checked eBay and they appear to be readily available from China:? Roger Nulton ? From: [email protected] <[email protected]> On Behalf Of Bob Werre ? I was changing a few mis. items in a drawer just a few minutes ago.? I once bought a box of carbide drill bits from a train-show exhibitor.? I think Micro tool people also sell the same thing--really just a bunch of bits (of random sizes!) in a plastic box, but each bit has a fat collar around it.? I had thought that collar mount would save a lot of time just in not having to adjust the collet size for each bit change.? I once tried to use them but it quickly broke.? I don't think I've tried any since, so to the back of the drawer they went!? I'm wondering if you gentlemen have used them successfully and how you deal with carbide bits?? Bob Werre -- Mike Swederska
Meramec Valley Lines Modeling Mopac equipment in 3/16 https://www.youtube.com/@mikesscale3149
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