Made some more progress today:
Re-attached the rails to the side base pieces.
![Using a CNC machine to build a CNC router. 117823-0](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117823;image)
Making sure the gantry bearings slide smoothly by loosing them up, sliding them on the rail, then tightening them. This is step that has to be done for every single rail and bearing, sometimes it helps to leave the rail loose as well.
![Using a CNC machine to build a CNC router. 117825-1](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117825;image)
Tapping the block for the ball screw bearing mount which attaches to the back base piece
![Using a CNC machine to build a CNC router. 117827-2](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117827;image)
![Using a CNC machine to build a CNC router. 117829-3](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117829;image)
Had the front and back base pieces attached so I could match drill the holes for the side base pieces
![Using a CNC machine to build a CNC router. 117831-4](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117831;image)
Marked up the center drilled holes, one clearly says 13/64's but I accidentally grabbed a 15/64's. Hopefully that doesn't cause too many problems.
![Using a CNC machine to build a CNC router. 117833-5](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117833;image)
Drilling a pilot hole followed by a full size hole
![Using a CNC machine to build a CNC router. 117835-6](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117835;image)
Detaching the pieces so I can work on just the back base piece
![Using a CNC machine to build a CNC router. 117837-7](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117837;image)
Drilling out the center holes
![Using a CNC machine to build a CNC router. 117839-8](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117839;image)
My favorite machining operation of all time, deburring holes
![Cheesy :D](https://cdn.geekhack.org/Smileys/solosmileys/cheesy.gif)
![Using a CNC machine to build a CNC router. 117841-9](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117841;image)
Counterboring the two top holes for a 10/32 screw
![Using a CNC machine to build a CNC router. 117843-10](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117843;image)
Milling out a hole for the ball screw coupling. Ideally this would be done with a 1.25" boring bar but I didn't have one and a square was easy to do.
![Using a CNC machine to build a CNC router. 117845-11](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117845;image)
Attaching the bearing mounting block with loctite.....on the wrong side......I fixed it later
![Using a CNC machine to build a CNC router. 117847-12](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117847;image)
Doing a test fit on the base, everything matched up and the gantries glided well but my phone battery died so I didn't get any pictures. Took it apart immediately after so I could move it.
![Using a CNC machine to build a CNC router. 117849-13](https://geekhack.org/index.php?PHPSESSID=khcgbduqd1qg6hg9ml04uouv4amfr3ed&action=dlattach;topic=77195.0;attach=117849;image)
Next up is machining the brace between the gantries, the midway bearing mount, attaching the ballscrew for the Y axis, and the final assembly.