Per belt anchor, so x4 for each ShapeOko:
- 3x M5 x 8mm bolts
- 3x M5 washers
- 1x M5 nut
- ~50mm length of aluminium right-angle section, sides ~10-12mm
- 1/4" x 3/4" x 2-1/2" steel strip with two holes, supplied with the ShapeOko kit
- 4.5mm drill bit
- 5mm drill bit
- 5mm thread tap
- hacksaw or jigsaw to cut the aluminium
How to make them
- Cut two ~25mm lengths of aluminium right-angle section
- Actually the top piece doesn't need to be right-angle section - you can use a flat strip of a similar width instead
- Hold one piece against the steel strip as shown in diagram 1 below, so that the tops are flush, and mark the position of the hole with a pencil
- Centre-punch the centre of the hole
- Drill through with a 5mm drill bit
- Now take the other piece of right-angle section, and centre punch roughly in the centre of the left-most third, and the right-most third, as shown in diagram 2 below
- Clamp the two sections together as shown in diagram 3 below
- Drill through the unclamped side with a 4.5mm bit
- Tap the 4.5mm hole to 5mm
- Remove the clamp
- Drill out the hole in the top piece ONLY to 5mm, removing the thread
- Put the sections back together, and screw in one of the bolts to clamp them back together
- Repeat for the other side, as shown in Diagram 4
- Using a 5mm bolt, nut and washer, fit the bottom section to the steel strip
- Place the end of the belt across the top, between the two threaded holes, then loop it back on itself, teeth to teeth.
- Put the other section on top, and screw two bolts through into the lower section. Don't do it up tight yet.
- Using the loop of belt as a handle, pull the belt tight, using your precisely calibrated muscles to pull with 6lbs of tension, and while holding that tension, tighten the two bolts to clamp the belt in place.
- Obviously you only need to apply the tension while doing the second side of each belt.