OK, I've free-cut the "football" for the last time.
After looking around for a short while and not finding one, I decided to draw the mounting template for a Happ 3" trackball mount in Photoshop.
It's not very elegant since I threw it together in about 5 min, but I just tried it and it works. This should get you very close, if not perfect when mounting a Happ 3" trackball using their black mounting plate.
DISCLAIMER: This template is to be used on the UNDERSIDE of the control panel....otherwise, you will cut the exact OPPOSITE shape that you need.Here's a link to a printable JPG from my photobucket:
http://s128.photobucket.com/albums/p191/mcseforsale/MAME_CAB/?action=view¤t=HAPP_3_INCH_TRACKBALL_MOUNT1.jpgIt looks like this:
This is what I did:
1.) tape this template on the UNDERSIDE of the CP where I wanted it, using the lines to make sure it was square.
2.) Take a 6p nail and "center punch" each of the 4 mounting holes and each "point" on the football shape.
3.) Drill out mounting holes with a 7/32" bit (they should be exactly 6" center to center)
4.) Draw in the football with pencil and straight edge using the nail punches as reference points.
5.) Drill pilot holes for jigsaw with 1/2" bit INSIDE the football
6.) Cut out the football with jigsaw
7.) flip CP over and install Happ 3" Trackball mount
8.) trace around the black trackball mount
9.) Using the trackball mount as a stage for the router base, set my plunge depth by positioning my router so that the bit falls into the trackball hole on the mount. Setting my plunge this way allows EXACT dept for flush mounting. Then remove the trackball mount from the CP.
10.) Set my fences/straight edges..whatever and route my trackball area for flush mounting..
11.) fin!After routing, this is what I ended up with.
NOTE: I routed mine roughly 1/32 over on each side due to bad router plate measurements....and it will be hidden under art and plexi. Your router-fu is much better than mine, I'm sure!
Again!...This will have to be used from the bottom of the cab...or print in reverse to cut from the top. The top of this template should be closest to the monitor AND ON THE UNDERSIDE OF THE CP!!!.
Thanks,
AJ