Doubt about PCB drill holes

Thread Starter

bloguetronica

Joined Apr 27, 2007
1,359
I have a doubt. I'm designing a PCB for the "Quatour" project. But I need to know if there are standard hole diameters.

I'm planning to use 0.8mm and 1.2mm holes for components, but I'm not sure if this is correct.
 

Wendy

Joined Mar 24, 2008
21,840
I have bought a set of high quality refurbished PC board drills from Dan's small parts and electronics for homemade PCB boards.

http://www.danssmallpartsandkits.net/

His is an odd shop, offers parts through the internet, but insists on snail mail for orders and checks. Good stuff though. I'm not sure if it is what you're asking for, but here is the section off his internet catalog. I suspect the holes are standardized, but thinking about it I have to answer I'm not sure.



50 PIECE CARBIDE DRILL BIT KIT


HERE IS A VERY NICE 50 PIECE CARBIDE DRILL BIT KIT..THESE ARE VERY NICE AND HAVE 1/8" SHANK..AND FIT DREMEL TOOLS..SMALL DRILL PRESS'S AND OTHER SMALL HOBBY DRILLS
THIS KIT INCLUDES 5 PIECES EA. OF THE FOLLOWING SIZES AND 10 PIECES EA. OF NO.66 AND NO.67
  • 5 PIECES NO. 70
  • 10 PIECES NO. 66
  • 10 PIECES NO. 67
  • 5 PIECES NO. 79
  • 5 PIECES NO. 73
  • 5 PIECES NO. 76
  • 5 PIECES NO.77
  • 5 PIECES NO. 80
THIS KIT COMES WITH A CASE TO HOLD THE BITS AND THE PIC. GIVES YOU A IDEA OF THIS AND WHAT YOU WILL GET...VERY NICE ASSORTEMENT TO HAVE AROUND THE SHOP...PRICE...$12.50
 

beenthere

Joined Apr 20, 2004
15,808
The size of the drills available define the standard hole diameters. Sometimes, you just have to spend time with a micrometer and mechanical drawings to find out what sizes of holes you need in a PCB. Just don't make the holes too tight...
 

scubasteve_911

Joined Dec 27, 2007
1,202
Yeah, try not to dwell on standard holes, etc.. Just use the recommended footprint drawing hole size, or if it doesn't exist, make it a bit bigger than the actual pin diameter. You should get standard drill sizes from your pcb house, then account for the plating that they will apply. I second the motion 'don't make the holes too tight', it has happened to me before and it is very unpleasant.

Steve
 

mrmeval

Joined Jun 30, 2006
833
Component drawings have the lead diameter min and max and they are sometimes even correct. ;)
 

AlexR

Joined Jan 16, 2008
735
Have a talk to your board manufacturer. Most can make the holes any size you specify but have a list of preferred sizes and charge you extra if you ask for hole sizes that are not on the preferred list.
 

nanovate

Joined May 7, 2007
665
Remember that the holes get plated so the PCB Mfg will actually drill a hole larger than you specify taking into account their tolerances for drill and plating to give you a "finished through hole" size. You want to check to see what their standard tolerances are so that you do not "make them too tight" as mentioned above.
 

lightingman

Joined Apr 19, 2007
374
Hi,

For standard PCB work... 0.8mm for IC's, 0.95mm or 1mm for other components. Other useful sizes are 1.25mm and 1.5mm.

Daniel.
 

John Luciani

Joined Apr 3, 2007
477
I have a doubt. I'm designing a PCB for the "Quatour" project. But I need to know if there are standard hole diameters.

I'm planning to use 0.8mm and 1.2mm holes for components, but I'm not sure if this is correct.
The list below is the standard **finished** hole sizes (in inches) I
have been able to use in almost all of by PCBs. Plating decreases the
drilled hole by apx 3-5mils. Using this set of holes is a close match
for both AP Circuits and the PCB Express process. Allow apx 5-10mils
for clearance.

.020 .025 .029 .035 .046 .052 .079 .125 .150

Using a fixed set of sizes is useful in finding mistakes. Reviewing
the drill list gives a quick indication of a drill mistake.

If you use components with pressfit leads you need to follow the
manufacturers recommendation exactly.

I have started a footprint creation document that documents the
guidelines I use when creating footprints. It is my website at

http://www.luciani.org/not-quite-ready/not-quite-ready-index.html

(scroll down to "Footprint Reference Document")

(* jcl *)
 
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