Hi Maso
I'm away on vacation for a couple of weeks so can't upload any images. But you are correct. The two flanged bearings have their non flanged faces together to form a channel for the belt. I've previously tried one bearing between two large washers but it's surprising how much friction there is between the washers and the edges of the belt. Flanged bearings are much better. The sequence for the top idler is straightforward.
1. Drill through the bolt path with a 5mm drill to size the two holes correctly and remove the wall on the inside of the square for the extrusion
2. Slide an M5 washer onto an M5 45mm SHCS
3. Insert the SHCS into the hole in the stretcher
4. Place two flanged bearings, oriented as described above, one M5 washer and one M5 nut onto the bolt.
5. Turn the nut to allow enough room to let the bolt tighten into the T nut at the top of he tower
6. Tighten the nut to clamp the two bearings and washer against the stretcher.
This arrangement allows one bolt to carry the bearings with support at both sides to stop flex and also secures the top vertex to the tower securely to enable your belts to be tensioned tightly.
You will probably have your machine built by the time I get home but if not I will post some images.
Andy
I'm away on vacation for a couple of weeks so can't upload any images. But you are correct. The two flanged bearings have their non flanged faces together to form a channel for the belt. I've previously tried one bearing between two large washers but it's surprising how much friction there is between the washers and the edges of the belt. Flanged bearings are much better. The sequence for the top idler is straightforward.
1. Drill through the bolt path with a 5mm drill to size the two holes correctly and remove the wall on the inside of the square for the extrusion
2. Slide an M5 washer onto an M5 45mm SHCS
3. Insert the SHCS into the hole in the stretcher
4. Place two flanged bearings, oriented as described above, one M5 washer and one M5 nut onto the bolt.
5. Turn the nut to allow enough room to let the bolt tighten into the T nut at the top of he tower
6. Tighten the nut to clamp the two bearings and washer against the stretcher.
This arrangement allows one bolt to carry the bearings with support at both sides to stop flex and also secures the top vertex to the tower securely to enable your belts to be tensioned tightly.
You will probably have your machine built by the time I get home but if not I will post some images.
Andy