Aligning sketch between edges of a padded part

[cram]

I'm wanting to align a sketch between edges of a part, in order to than extrude and subtract making a hole in the part. I'm wanting to align a circle sketch between two edges so it is centred between the two and also set a distance from the end of part. I've attached the file.

OS: Windows 7
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.17.11266 (Git)
Build type: Release
Branch: master
Hash: ab1b344410600b7d694abf6bb4ff2b71769978c5
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.0.0

[sheinz]

I'm not sure if I understood you correctly.
Does it look like what you want?

I rearranged the part to be symmetrical around the origin. It's always easy to work with the part this way.
And just create a sketch on the YZ plane. It will be right between the edges of the part.
When pocketing select "Symmetric to plane" and "Through all".

2017-06-14-165237_711x380_scrot.png (27.67 KiB) Viewed 1846 times

BoltFootingBracket6.FCStd

(24.6 KiB) Downloaded 43 times

[chrisb]

If that's the use case it is far easier if you attach the sketch to one of the faces at the side and pocket through all. If you need the arbitrary solution and cannot reposition the object as sheinz showed you can use expressions to position the sketch. Watchout: you can use expressions for the placement in the data tab only, not in the placement dialog.

[cram]

I'm not sure if I understood you correctly.
Does it look like what you want?

I rearranged the part to be symmetrical around the origin. It's always easy to work with the part this way.
And just create a sketch on the YZ plane. It will be right between the edges of the part.
When pocketing select "Symmetric to plane" and "Through all".

2017-06-14-165237_711x380_scrot.png
BoltFootingBracket6.FCStd

Awesome thanks Sheinz. The result is what you have is what I was after.

[cram]

If that's the use case it is far easier if you attach the sketch to one of the faces at the side and pocket through all. If you need the arbitrary solution and cannot reposition the object as sheinz showed you can use expressions to position the sketch. Watchout: you can use expressions for the placement in the data tab only, not in the placement dialog.

Thanks Crisb, I was going to sketch to face , but thought there may be away of using the part edges as a reference when positioning however there does not seem such tool. From what I understand by doing it this way the position of sketch needs to be manually positioned by coordinates?

[eds]

If that's the use case it is far easier if you attach the sketch to one of the faces at the side and pocket through all. If you need the arbitrary solution and cannot reposition the object as sheinz showed you can use expressions to position the sketch. Watchout: you can use expressions for the placement in the data tab only, not in the placement dialog.

Thanks Crisb, I was going to sketch to face , but thought there may be away of using the part edges as a reference when positioning however there does not seem such tool. From what I understand by doing it this way the position of sketch needs to be manually positioned by coordinates?

The tool you're looking for is this:
https://www.freecadweb.org/wiki/Sketcher_External

[cram]

The tool you're looking for is this:
https://www.freecadweb.org/wiki/Sketcher_External

Thanks eds, that is exactly what I was looking for.