Create M6 threaded holes and mount BF12 on Y axis
- ~6mm diameter marking tool (if used gently, a 6mm drill bit and a hammer can be used or a center punch with a compatible spacer) A 7/32" marking tool will work as well.
- 5mm Drill bit
- M6 Taper Tap
- Prepared Frame Assembly from step 3
- (6) M6x30mm Bolt
- (2) 3D printed BF12 Mount
Do not mismatch and take BK12 mounts for this step ! BF12 mounts are smaller than the BK12 mounts and have two holes for attaching the BF12 block. The BK12 mounts are thicker and have four holes for attaching the BK12 block.
BF12 Mounting block.
- Both BF12 Mounts are installed with 3 bolts each.
- Both BF12 Mounts are oriented correctly as shown in Figure 4.3. (The bolts make a triangle pattern pointing towards the back of the machine.)
- Neither BF12 Mount is mounted over the cable access hole between the Y-Axis frame beam and the X-Axis frame beam.
- Note that the orientation of the machine in Fig 4.3 is showing the BF12 blocks installed at the REAR of the machine!
Place the BF12 Mount on the Y-Axis frame far from the side which has the cable pass through hole as shown in Figure 4.1. The end of the frame with the cable pass through hole is marked prohibited in red in the figure. The locations where BF12 Mounts should be marked and placed are circled in green.
Ensure the BF12 mount is oriented correctly, as shown in Figure 4.2. The three counterbored holes make a triangle pattern pointing towards the back of the machine. Note that the BF12 mount is installed at the back of the machine, not the front.
- Mark the three counterbored holes with your marking tool. Ensure the marks are adequately centered. If you are doing this with a drill bit, be careful to hit the bit very lightly and deepen the marking before drilling with a center punch.
- Repeat steps 2 and 3 on the other Y-Axis frame beam where circled in green in Figure 4.1.
- Drill all 6 marked points with a 3mm pilot bit and then follow up with a 5mm bit.
- Thread all holes made in the previous step with an M6 tap bit.
- Install both BF12 Mounts with M6x30mm bolts. (Note: If the holes do not align well, you may be able to use a drill to widen the holes on the BF12 as well as use longer M6x50 for the two outer screws, start the screws with the BF12 off the rail a bit, then slowly tighten the screws a turn or two at a time.)