How Micro Drill Bits Are Made [video]
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How Micro Drill Bits Are Made [video]
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Re: How Micro Drill Bits Are Made [video]
#2What is the smallest drill bit one can buy?
Re: How Micro Drill Bits Are Made [video]
#3What is the smallest drill bit one can buy?
They can be pretty small. I purchased this set sometime back. It’s served me well. Gyros® HSS Wire Gauge Mini Twist Drill Bit Set |Includes 20 Micro High Speed Steel Bit Sizes #61 to #80 | with Convenient Clear Dome Storage Case (45-22010) https://www.amazon.com/gp/product/B000SKVF8I.
I frequently use a bigger size for fabricating reinforced epoxy with paper clips serving as rebar. Gyros Micro Drill Bit Set of 25#57 Drill Bits–Small Drill Bits for Jewelry, Plastic and Soft Metal–Mini Twist Drill Bit Set for Pin Vise Hand Drill, Rotary Tool - Carbon Steel Wire Gauge Drill Bits
Re: How Micro Drill Bits Are Made [video]
#4What is the smallest drill bit one can buy?
PCB manufacturers specify their minimum via sizes. Probably that is the smallest usable drill bit size made in quantities. JLCPCB says minimum 0.2mm so there's what you got.
Keep in mind you will need a air bearing spindle that runs at high x10k RPMs to actually use them.
For smaller holes we zap them in the material with lasers.
Re: How Micro Drill Bits Are Made [video]
#5What is the smallest drill bit one can buy?
They can be pretty small. I purchased this set sometime back. It’s served me well. Gyros® HSS Wire Gauge Mini Twist Drill Bit Set |Includes 20 Micro High Speed Steel Bit Sizes #61 to #80 | with Convenient Clear Dome Storage Case (45-22010) https://www.amazon.com/gp/product/B000SKVF8I . I frequently use a bigger size for fabricating reinforced epoxy with paper clips serving as rebar. Gyros Micro Drill Bit Set of 25#57…
Out of curiosity what do you use the paperclip reinforced epoxy for? Some sort of mold making?
Re: How Micro Drill Bits Are Made [video]
#6One 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 some other process?
I'm curious because that seems like a complicated piece of machinery to only be operating at a few percent of up time.
Re: How Micro Drill Bits Are Made [video]
#7If 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
Re: How Micro Drill Bits Are Made [video]
#8One 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…
That "four to five hours" didn't make any sense to me either. Perhaps they meant that doing this for a batch of bits takes that much time?
It also struck me as disappointing that the actual grinding of the flutes was not really shown. I'm sure it would be hard to photograph as it's likely completely bathed in cutting fluid, but perhaps they could have done a run without it just for the video?
Re: How Micro Drill Bits Are Made [video]
#9One 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…
That "four to five hours" didn't make any sense to me either. Perhaps they meant that doing this for a batch of bits takes that much time? It also struck me as disappointing that the actual grinding of the flutes was not really shown. I'm sure it would be hard to photograph as it's likely completely bathed in cutting fluid, but perhaps they could have done a run without it just for the video?
The "four to five" hours they mention is probably the time required to setup the grinding center, maybe dress the wheels, do some fine adjustments on the grinding process. Once the machine is setup, grinding each drill is just a few minutes.
The grinding machines they are using seems to require quite a bit of manual handling, but cnc grinding center where everything is automated also exists.
Actually, the grinding of the flutes is shown very briefly around 3:35. Filming this operation on such a small scale is difficult because of the geometry of the system and the grinding process: the drill blank is supported from below to prevent the carbide from snapping under the load, and the wheel grinds from above. The grinding wheel is order of magnitudes larger in diameter than the diameter of the drill it is grinding. Also, everything is flooded with cutting fluid.
There are hundred of videos showing the process on youtube if you look for "cnc grinding drill".
Re: How Micro Drill Bits Are Made [video]
#10What is the smallest drill bit one can buy?
They can be pretty small. I purchased this set sometime back. It’s served me well. Gyros® HSS Wire Gauge Mini Twist Drill Bit Set |Includes 20 Micro High Speed Steel Bit Sizes #61 to #80 | with Convenient Clear Dome Storage Case (45-22010) https://www.amazon.com/gp/product/B000SKVF8I . I frequently use a bigger size for fabricating reinforced epoxy with paper clips serving as rebar. Gyros Micro Drill Bit Set of 25#57…
A #80 tap drill is 3.4x bigger (.343mm) than the one they're showing in the video (.1mm). Which isn't to say they aren't impressive, but they're typically made of HSS, not solid carbide.
.1mm is about 4 thou (.004"), or the thickness of a piece of paper. I'm being a little loose with the numbers here, but they're in the ballpark.