Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => AmpTools/Tech Tips => Topic started by: Fresh_Start on July 28, 2008, 09:21:48 pm

Title: Typical drill bit sizes
Post by: Fresh_Start on July 28, 2008, 09:21:48 pm

Do you all think it would be useful to compile a table of drill sizes for various tasks?

For example:
Turret (standard) 3/32"
Eyelet 1/8"
Input jack - 3/8"
Isolated input jack - 1/2"
Test point jack 1/4"
Toggle switch (large) - 15/32"
#8 bolt
#6 bolt

etcetera

Or is this something everyone should figure out on their own if they don't know it instinctively?

My question has nothing to do with having to re-drill several holes and use one size smaller bolt than planned in a chassis last weekend... at least I didn't remove too much metal on the first pass ;)

Chip

Title: Re: Typical drill bit sizes
Post by: jjasilli on July 28, 2008, 09:53:41 pm

I don't know about garolite boards; but Goug's el34 world has info on drill bit sizes for that.  For everything else I use z 1/8" bit for a pilot hole; then a unibit. 

Title: Re: Typical drill bit sizes
Post by: sawdust on July 29, 2008, 05:59:50 am

I believe this may be every drill bit chart ever published.

Google "drill bit chart" (http://images.google.com/images?q=drill+bit+chart)

Title: Re: Typical drill bit sizes
Post by: tubesornothing on July 29, 2008, 09:08:27 am

Here is mine.  I post it right by the drill press.

         
Tube socket screws   #4   1/8”   
Power Tube Belton tube socket holes      ¾”   
Preamp Tube holes      7/8”   
         
Board screws   #4   1/8”   
         
Transformers   #8   3/16   
         
OT tx grommets      ½”   0.5
PT tx grommets      7/8”   0.875
Rev tx grommets      ½”   0.5
         
Jack isolated      ½”   0.50
Jack grounded      3/8”   0.375
Pot      5/16”   0.3125
Fuse      ½”   0.5
Standby/power switch      ½”   0.5
Carling switch      ½”   0.5
Taiwan Indicator      0.40”  (10mm)   0.40
Fender lamp assembly      11/16”   0.6875”
Small switch      ¼”   0.25
Impedance switch      13/32   0.40625
         
Belton 9pin solder tab      ¾”   
Belton 8pin solder tab      1 ¼”   
         
         
Speaker mount hole      15/64   .2344
Handle mount hole      15/64   .2344
         

Title: Re: Typical drill bit sizes
Post by: Fresh_Start on July 29, 2008, 02:48:14 pm

t-o-n

That's what I was thinking of!

Quote from: sawdust on July 29, 2008, 05:59:50 am

I believe this may be every drill bit chart ever published.

http://images.google.com/images?sourceid=navclient&ie=UTF-8&rlz=1T4GZHZ_enUS226US226&q=drill+bit+chart&um=1&sa=X&oi=image_result_group&resnum=1&ct=title

Dave - those links go some strange places...

Chip