Drill Sizes

Thanks so much for that helpful information.  I was thinking about using

Advanced since they have been courting me, but I may go with AP Circuits or

Sunstone since I do not really like the drill size spec.

On that drill table, "Set Drill_menu" is included in the eagle.scr file under

each editor subheading.  I have no idea if this will do what you want, but I

noticed it was there.  Seems that it should, but things are seldom as they seem

in Eagle...

Syd

On Fri, 18 Dec 2009 11:13:39 -0500, Chuck Huber <chuck.huber@dukepro.com> wrote:

On 12/14/2009 07:41 PM, analog@logwell.com wrote:

What do the drill sizes in the menus mean?  Actual drill or plated size?

 

Many (but not all) board houses interpret this as the finished hole

size.  In the case of Advanced Circuits, it's the drill hole size.  The

plate through will take up 3-4 mils on each side of the hole.

 

Why

are they expressed to so many decimal places?

 

I haven't found out how to change it yet, but the drill sizes default to

millimeters.  When your grid is in inches or mils, the conversion takes

it out to many decimal places.

 

I need a .061 hole for a staked

turret terminal; do I uese that .063xxx drill size?

 

You can set the hole size to anything appropriate to your need.  I've

had to use large holes for pins that are rectangular (such as on a

relay).  For a pin that's .050" wide, I'll add about .010 or more to

handle the plate-through and a little tolerance for a loose fit.  So a

hole that's .063" would be fine in this example.  The extra few mils in

the diameter will help effect easier assembly should any pins be

slightly bent.

 

I am used to seeing a

simple selection like .061 in menus of simple programs like the ExpressPCB

designer.

 

If you find out how to set the default drill sizes, please let me know.

I've been looking for this for a while to no avail.

 

What do I wind up with if I just type in .061?

 

You'll wind up with either a .061 drill, or a .061 finished hole,

depending on your board house.  When you set the drill size, you can

also specify units.  i.e. 61mil would accomplish the same thing.  This

comes in handy if you grid is set to a metric scale but you want to use

English drill sizes.

 

Enjoy,

   - Chuck

Thanks so much for that helpful information.  I was thinking about using

Advanced since they have been courting me, but I may go with AP Circuits or

Sunstone since I do not really like the drill size spec.

On that drill table, "Set Drill_menu" is included in the eagle.scr file under

each editor subheading.  I have no idea if this will do what you want, but I

noticed it was there.  Seems that it should, but things are seldom as they seem

in Eagle...

Syd

On Fri, 18 Dec 2009 11:13:39 -0500, Chuck Huber <chuck.huber@dukepro.com> wrote:

On 12/14/2009 07:41 PM, analog@logwell.com wrote:

What do the drill sizes in the menus mean?  Actual drill or plated size?

 

Many (but not all) board houses interpret this as the finished hole

size.  In the case of Advanced Circuits, it's the drill hole size.  The

plate through will take up 3-4 mils on each side of the hole.

 

Why

are they expressed to so many decimal places?

 

I haven't found out how to change it yet, but the drill sizes default to

millimeters.  When your grid is in inches or mils, the conversion takes

it out to many decimal places.

 

I need a .061 hole for a staked

turret terminal; do I uese that .063xxx drill size?

 

You can set the hole size to anything appropriate to your need.  I've

had to use large holes for pins that are rectangular (such as on a

relay).  For a pin that's .050" wide, I'll add about .010 or more to

handle the plate-through and a little tolerance for a loose fit.  So a

hole that's .063" would be fine in this example.  The extra few mils in

the diameter will help effect easier assembly should any pins be

slightly bent.

 

I am used to seeing a

simple selection like .061 in menus of simple programs like the ExpressPCB

designer.

 

If you find out how to set the default drill sizes, please let me know.

I've been looking for this for a while to no avail.

 

What do I wind up with if I just type in .061?

 

You'll wind up with either a .061 drill, or a .061 finished hole,

depending on your board house.  When you set the drill size, you can

also specify units.  i.e. 61mil would accomplish the same thing.  This

comes in handy if you grid is set to a metric scale but you want to use

English drill sizes.

 

Enjoy,

   - Chuck