Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

I forgot the rest of the words...

Many thanks to engine guru George Aldrich for posting upon his website the
BEST cotton-pickin' drill & tap size chart this Cajun ever did saw...  Once
you figger out the color key, this rascal has it ALL, up to 1".....  Big
enuf for me...

http://rcplanet.com/aldrich_models/ .....  Just click the link..

Cheers,

Bill
http://rcplanet.com/grafix/

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

The formula is so simple that the only thing I use charts for is to
convert drill sizes to decimal inch.  Tap drill size is the outside
diameter of the***minus the pitch (or 1/number thds/inch).  Example:
3/8-16 tap drill is 3/8 - 1/16 = 5/16", 1/4-20 tap drill is
1/4(.25)-1/20(.05)=.200".  This formula works for standard and metric
threads, the nice thing about metric is they give you the OD and the
pitch!  I saw this in a book in the library and haven't met many
machinists that knew of it.  It's good to know in case you have to tap
something that isn't on the chart, perhaps 1/4-32 glow plug threads.
--

Roger Neal

Quote:

> I forgot the rest of the words...

> Many thanks to engine guru George Aldrich for posting upon his website the
> BEST cotton-pickin' drill & tap size chart this Cajun ever did saw...  Once
> you figger out the color key, this rascal has it ALL, up to 1".....  Big
> enuf for me...

> Cheers,

> Bill
> http://www.FoundCollection.com/

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Quote:

>The formula is so simple that the only thing I use charts for is to

<SNIP>

DAMN !

Been struggling with that for YEARS !  Bet I've got a dozen charts
scattered around here and there.

THANKS !

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Were you reading Machinery's Handbook by any chance?

Quote:
> The formula is so simple that the only thing I use charts for is to
> convert drill sizes to decimal inch.  Tap drill size is the outside
> diameter of the***minus the pitch (or 1/number thds/inch).  Example:
> 3/8-16 tap drill is 3/8 - 1/16 = 5/16", 1/4-20 tap drill is
> 1/4(.25)-1/20(.05)=.200".  This formula works for standard and metric
> threads, the nice thing about metric is they give you the OD and the
> pitch!  I saw this in a book in the library and haven't met many
> machinists that knew of it.  It's good to know in case you have to tap
> something that isn't on the chart, perhaps 1/4-32 glow plug threads.
> --

> Roger Neal

> > I forgot the rest of the words...

> > Many thanks to engine guru George Aldrich for posting upon his website
the
> > BEST cotton-pickin' drill & tap size chart this Cajun ever did saw...
Once
> > you figger out the color key, this rascal has it ALL, up to 1".....  Big
> > enuf for me...

> > http://www.FoundCollection.com/;Just click the link..

> > Cheers,

> > Bill
> > http://www.FoundCollection.com/

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Ok, that's cool,  BUT
what is the formula for the really useful sizes,
say 0-80 up to 10-24???
bob
Quote:

>The formula is so simple that the only thing I use charts for is to
>convert drill sizes to decimal inch.  Tap drill size is the outside
>diameter of the***minus the pitch (or 1/number thds/inch).  Example:
>3/8-16 tap drill is 3/8 - 1/16 = 5/16", 1/4-20 tap drill is
>1/4(.25)-1/20(.05)=.200".  This formula works for standard and metric
>threads, the nice thing about metric is they give you the OD and the
>pitch!  I saw this in a book in the library and haven't met many
>machinists that knew of it.  It's good to know in case you have to tap
>something that isn't on the chart, perhaps 1/4-32 glow plug threads.

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Most taps have the correct drill size stamped on them along with the tap
size and tpi.  At least the tap and die set I have.  Otherwise, there is
also a chart/table that comes with the set or go to the reference Bill

Thanks Bill

Quote:
> I forgot the rest of the words...

> Many thanks to engine guru George Aldrich for posting upon his website the
> BEST cotton-pickin' drill & tap size chart this Cajun ever did saw...
Once
> you figger out the color key, this rascal has it ALL, up to 1".....  Big
> enuf for me...

> http://rcplanet.com/aldrich_models/ .....  Just click the link..

> Cheers,

> Bill
> http://rcplanet.com/grafix/

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Quote:

> Ok, that's cool,  BUT
> what is the formula for the really useful sizes,
> say 0-80 up to 10-24???
> bob

Well, for machine***number sizes, you need to either know the OD or
have a chart, and if you got to look up the OD in a chart, might as well
look up the tap drill size too!
--

Roger Neal

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

Quote:

> Were you reading Machinery's Handbook by any chance?

No, it was some textbook at a community college, I was reading in the
library between classes. (was working as a machinist at the time)
--

Roger Neal

Drillin' 'n' tappin 'n' tappin' 'n' drillin'

I was hoping there was actually some method th the madness with those silly
numbered screws.
bob

Quote:

>> Ok, that's cool,  BUT
>> what is the formula for the really useful sizes,
>> say 0-80 up to 10-24???
>> bob

>Well, for machine***number sizes, you need to either know the OD or
>have a chart, and if you got to look up the OD in a chart, might as well
>look up the tap drill size too!