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4hv.org :: Forums :: General Chatting
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PCB drilling - bit sizes

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Killa-X
Tue Jun 23 2009, 03:28AM Print
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Link2

I was wondering what size bits i would need. Eagles CAD does a bad job at telling me the size. I was told a pin from a 1/4 watt resistor, or 555, is 0.028. Goldmine has 0.029, so i figured it's good. But what are leads like 1/2 watt resistors? They are thicker but does anyone know by how much?

I need these for drilling PCB boards with my dremel drill press, moded it so i could use thin bits.
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Electroholic
Tue Jun 23 2009, 04:24AM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
i use metric 0.7 for 1/4 watt resistors, 1.0 for 1/2w resistors and 1.3 for say 1n4004.
eagle works fine if you have the right components selected.
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Herr Zapp
Tue Jun 23 2009, 05:05AM
Herr Zapp Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Killa -

This seems like kind of a pointless question to me, kind of like "what kinds of parts do I need to make a widget"? Obviously, the parts you need will depend on exactly what kind of widget you want to make.

Obviously, the drill sizes you will need are dictated by the lead size on the components you intend to use. The lead sizes are ALWAYS shown on the component specification.

I can't imagine building any kind of electronic project without reviewing the component spec for each and every component to learn what is it, how it works, its voltage and current ratings, lead diameter, lead spacing, pinout, special handling or mounting requirements, etc.

So, if you know what components you will be using, and have reviewed the component specifications, you know exactly what drill sizes you will need.

Regards,
Herr Zapp

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uzzors2k
Tue Jun 23 2009, 10:18AM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
1mm for smaller components and ICs, and 1.5mm for everything else. This guy sells resharpened carbide bits with a 3mm shank, which is useful when using a standard drill chuck. Link2
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Proud Mary
Tue Jun 23 2009, 12:57PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Whatever you are doing, another way of looking at it is which drill sizes are getting broken or going blunt the most often? Those are the ones you need to keep buying.
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Killa-X
Tue Jun 23 2009, 06:57PM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Well currently the smallest i own is like 1.5mm because I'm just starting making my own PCB boards, I still have to etch solution my first every board, and then drill my first. Anyways, Thanks for the tips / help!
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Mads Barnkob
Tue Jun 23 2009, 07:34PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I almost bought a dremmel with proper sized bits for most standard component leads.

but...

Then I realized the cost of all that equipment, not to talk about the bits themself! So I went with 1mm bits and my accu machine, works perfectly and have not broken a bit yet even thou I am holding the accu by hand and its quite heavy :) Drilled 4 PCBs so far.

Most accu drills can not take bits smaller than 1,5 or 2mm, so i wrapped the 1mm bit in aluminum foil and its still perfectly centered!
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...
Tue Jun 23 2009, 07:50PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I would second the recomendation for getting carbide drills with a 1/8" shank since they will fit in any drill and will last longer/give more precise holes than steel bits. Just make sure you have a rigid press or you will snap them.
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Killa-X
Tue Jun 23 2009, 08:37PM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Yup, and I think my dremel bits are all 1/8 inch. Both my small and large chuck can support 1/8 inch so that's good. I manage to get the drill-press station for only 40 dollars on amazon, and i only tested with 1mm bits on plastics. After an easy rubberband mod to the handle, it makes perfect holes. Guy told me that it can move 1mm but if you simply put a rubberband from the dremel holder to the pull handle, it wont at all. He's right :)

Th

Sometimes it helps to have inches/centimeters :) Sadly, I have to make my own butterfly-nut clamps for the slots in the base.
Th
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