I use a #60 drill bit and have found that a dull bit makes a mess or breaks.


I like a larger trace and landing size for my home brewed circuits.
I always make a dough nut or cross shape in the artwork so the drill bit
will waltz into the PCB without binding too much with the copper.
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I often get dozens of PCBs out of one #60? drill bit before it breaks.
I used to use smaller drill bits ..#70.. but concluded that the smaller
hole was not worth breaking 2 bits on each PCB.
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On 09/24/2018 11:34 PM, unclefalter via Groups.Io wrote:

Hi guys,

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So I’m working on a replica of Jon Titus’ Mark-8.? I’ve made a set of boards using his plans, and also using some 1973 vintage blank PCB stock to etch them on.? So far so good, but I’m running into a problem along the bottom of the board – there are a series of very small holes/pads that have to be drilled through for the bus.? I’m using a dremel with a 1/32” bit and I had the foresight to put holes in each of the pads.? Regardless, the drill is simply wrapping them around the shaft and pulling them off the board.? Not sure what I can do here.. any recommendations?? Should I have done the drilling before I etched?

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Brad

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