oval hole in eagle

MHello,

You need a oblong hole (it's a not a oval) and you can not do it directly, like a hole.

To do it on the PCB, you have to make a drill (with a drill tool), then you have to proceed a milling operation ( with a milling tool).

Same apply for Eagle :

first you place a pad,  drill diameter corresponding to the little diameter of you oblong hole.

Then you use the Milling layer and draw a wire in it, for that you use a width = little diameter of the oblong. (the wire must cover  exactly the oblong hole).

Don't forget to mention that you have a oblong hole to the PCB house (and give them a milling gerber file and or at least a blueprint of it).

Guillaume.

Thank you so much for replying me. I attached here the screen shot i took from eagle. Is this what you mean or you mean drawing the milling layer inside the circle?

Lac

I give you 4 examples:

The milling layer will represent the surface of the PCB that will disappear (it's the where the machine will cut).

For the 2 examples on the top, the pad diameter (copper area for solder, around the pin of the component) is sufficient for solder your component.

For the 2 examples on the bottom, the oblong holes is to long, and you will not have copper on both end of your hole, so I had a polygon on top and bottom to enlarge the pad. That way I'm sure that the solder will be able to go all around the pin of the component.

The to examples on the left, It's one way of doing this : the center of the line you draw on the milling layer is the trajectory follow by the milling (cutting) machine. The width of your line is the diameter of the milling tool (it's like a drill tool: the machine go down, but instead of going back in up direction, right after drilling, the machine will follow the line, and go up at the end of the line. As result instead of having a round hole, you can have any other shape (except that you can have a dimension smaller than the milling tool diameter).

On the right, it's when you have a huge hole that is too high, compared to the available milling tool diameter... in that case you, use a smaller diameter, and just draw the complete trajectory of the machine. Be careful, in that case the resulting hole is the surface inside you line, AND, the surface of the line itself (if you look closely this example :the drill of the pad is tangent to the EXTERNAL bored of the line !)

Thank you so much. Does this look right for you. Don't worry about dimension, i will fix it later. The empty part that has no milling layer is the hole i plan to draw.

Tell me if my explanation if better now....

Thank you so much for your help.

Lac

"lac nguyen"  skrev i nyhetsmeldingen:

548736953.111418407177584.JavaMail.jive@flcspu-csapp-01.premierfarnell.com

...

Thank you so much for replying me. I attached here the screen shot i

took from eagle. Is this what you mean or you mean drawing the milling

layer inside the circle?

Be careful if you have multilayer board. If you "go wild" on these millings,

you may end up shorting to inner layers. The DRC doesn't seem to check the

46milling layer at all. Milling is usually done unplated, but manufacturer

may plate it since its milled through copper on top and bottom. If you do

unplated milling I would prefer to draw it in the dimension layer instead of

milling. That way it will be done correctly, but unfortunately it doesnt

work for plated holes.

In summary, expect some communication with manufacturer when playing with

this layer. If you don't tell and he doesnt ask, a warning light should

blink.

lac nguyen wrote:

I am making a usb type A-B library device. Attachment is the link to the

datasheet. I need to make 2 oval holes but I cannot figure out how to do

it. I can only use the round and square pad. Do you have any suggestion

of how to do this? Thank you so much.

 

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Attachments:

Molex Micro USB A-B SMT 0475900001.pdf

Some of these datasheets are written by engineers who, sadly, have never

stepped inside a machine shop in their lives. The fastest way to drill an

oval hole is to chuck up a round drill bit in a hand drill and drill the

hole yourself. For PCBs, the vast majority of 'oval holes' in Recommended

PCB Layouts can simply be replaced with round holes of the same diameter as

the major axis of the oval, at far less cost than milling an oval hole.

Something to consider.

Bob

Hi guys, I'm trying to make long drill pad with no success.

In attached image I create long pad with 1mm round drill size, then I draw custom drill size (1mm diameter as pad drill, red line).

Then I assign red line (milling) to "drill plated" layer.

Is this the correct way to do this?

Thanks.