The smaller the drill, or milling bit, the smaller the run-out tolerance. For these size bits, you're going to need to make very certain the run-out is on the order of a few microns.
How Micro Drill Bits Are Made [video]
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Re: How Micro Drill Bits Are Made [video]
#22“This video is not available in your country” Anyone have an alternative link?
Re: How Micro Drill Bits Are Made [video]
#23If you're interested in feats of micro-drilling, I invite you to watch a Japanese game show where a machinist with a micro drill competes against one using an electrical discharge machine to drill lengthwise through a 0.5mm pencil lead: https://www.youtube.com/watch?v=gHR9YQl7ObU
Part two starts at 1:20 here:
Re: How Micro Drill Bits Are Made [video]
#24What is the smallest drill bit one can buy?
0.1mm: https://www.aliexpress.us/item/3256801655537532.html
I would not expect you to be able to use bits this small without special machinery.
I've used similar 0.8mm drill bits by hand, and they were fragile enough.
Re: How Micro Drill Bits Are Made [video]
#25This video seems to be unavailable in Canada, unfortunately.
Re: How Micro Drill Bits Are Made [video]
#26This video seems to be unavailable in Canada, unfortunately.
Re: How Micro Drill Bits Are Made [video]
#27One thing that strikes me as odd is 2:48 it says the rollomatic produces 48 pieces per hour, and then at 3:24 a human dominated process for centering the work piece to have it's drill curve cut "take four to five hours". They surely don't have 200 of these setting jigs. So, are there just lots of blanks made? do they damage that many of the work pieces in the process of setting one up? Are the surplus units used in s…
They also said that the centerless grinding process is used to reduce the length of the blanks. I'm pretty confident they're doing it to get the finished diameter of the shank. I find the How It's Made segments to be irritatingly shallow and sometimes grossly inaccurate. You could easily do a 22 minute segment on making these things if you went into more depth.
absolutely finishing the diameter not the length, was jarring to hear that
Re: How Micro Drill Bits Are Made [video]
#28Anyone know how much these cost to buy?
Re: How Micro Drill Bits Are Made [video]
#29Earlier quoted context omitted.
I'm afraid the overly-dramatic english dub announcer was too much and I couldn't finish watching. TLDW?
Part 2 is missing anyway, there’s no resolution.
It was linked above your comment. Absolutely incredible that the machinist was able to drill the entire length of the pencil lead.