Mark 4 build - step 1: Triangles: assembly 2

1. Tap your extrusions.
2. Pre-thread your T-nuts.
3. Slide the triangles together
1. The plastic brackets are rather stiff (by design, of course), so the only way to get the extrusions assembled is to insert all of them at once.
2. Place the three vertices rounded-side-up (make sure they're all the same vertex - motor or idler!) in a rough triangle.
3. Place the extrusions between them.  Both extrusion and vertex are 60mm tall
4. Insert the extrusions up to the first t-nut on all triangles.
5. Slowly bring the three brackets together, sliding all three extrusions into all three brackets simultaneously.  You'll need to orient all the T-nuts properly as you approach the two rear nuts.
6. When the extrusions are almost home, insert screws into the end plates and screw into the holes you tapped previously.
1. Screw in both extrusions on the bracket before moving to another bracket.
2. Make sure that there are no gaps!  After this step, the triangles should be rigid.
7. Tighten the uppermost t-nuts on all brackets - use the ball ends.
8. Flip the triangle carefully, then tighten the current uppermost t-nuts.












The screw in the center goes in first










       into the holes you tapped in step 1.


































9. Tighten the middle t-nuts from inside the triangle - it's a bit tight.
4. Install the motors



Motor going in.


1. If you're on the motor mount side, screw in the motors.
1. The idler triangle is done for now.
2. Use the M3 screws and washers, tighten down with the 2mm hex ball-end.
3. It's easiest to do the top two screws of each motor, then flip the triangle and do the new top two. 
    

That's it for step 1.  At the end, you should have two rigid triangles, one with motors and one with holes for the idler slider.  Step 2 will install the openrail towers, completing the frame for the machine.