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Post by cpr4200 on Jul 24, 2024 20:11:44 GMT -8
With folks using smaller wire for brake piping and grabirons these days, what are you guys doing for drill bits smaller than the old standard No. 80? PCB drills?
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Post by edwardsutorik on Jul 25, 2024 13:45:34 GMT -8
About 40 years ago, I bought a set of pivot drill bits, from .010" to .004". I can't even SEE the .004" cutting end without magnification. I've yet to need to use them.
I tend to drill holes (in plastic) larger than the wire size, anyway. Part of this is to allow room for the adhesive, usually epoxy. The other part is that it is very tricky to drill two holes to exact spacing to match a bent wire (grab iron). I typically use #76 or #78.
I see that McMaster has pivot drills down to .002".
As bits get smaller, there will be a point where you will not be able to do drilling by hand. The work will have to be in a vise/fixture, and you will use a drill press or a mill. The really teeny stuff is likely CNC, only.
Ed
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Post by fr8kar on Jul 25, 2024 16:14:37 GMT -8
DrillBitsUnlimited.com
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Post by cera2254 on Jul 26, 2024 6:14:08 GMT -8
In my experience the #79 bits seem to last a lot longer than #80 but seem to work the same.
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Post by Christian on Jul 26, 2024 9:06:31 GMT -8
With folks using smaller wire for brake piping and grabirons these days, what are you guys doing for drill bits smaller than the old standard No. 80? PCB drills? 0.008" wire is common. BLMA grabs are this size. It scales in the range of prototype grabs. The correct bit would be a #86 which I would break just getting it out of its package. Ed's comment about these bits being too small for success without a drill press or other machine has been my experience. The smallest bits I use are #78 which are still in the cheap range and of a size that I rarely break when hand drilling. The smallest wire in my stockpile is 0.004" which would be a #101 bit. Nope - not going to search one out. That wire also gets a #78 hole. In that case the slop in size will leave a sink between the wire and surface even if gap filling CA is used. A sink - depression - that is visible to a digital camera, but not to most folks eyes. Yep, some folks can see it! |
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Post by loco8107 on Jul 28, 2024 9:39:19 GMT -8
In my experience the #79 bits seem to last a lot longer than #80 but seem to work the same. The same here. I don’t even bother with #80 bits anymore. |
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