If you are making a rack and pinion system or a screw based system, the fine tuning of the pulley / pinion position is not such a big deal. I am thinking that belt drives require a bit more sophistication in this area.
Imagine that you have 2 each toothed belts driving an axis. (not a fixed belt drive, but a recirculating belt system) This would be "normal" to reduce racking effects.
Both of these belts will be looped around timing pulleys on two shafts - one on each end of the table.
At the stage where you tighten the first belt (at the joint), the pulleys for that belt must be free to rotate relative to the shafts, or it will only tighten one side of the belt, not the "back". After all of this, the pulleys on that belt can be fixed to the shaft and prevent rotation.
Now the second belt tightening process. It is almost certain that the gantry or whatever will be out of square and have a loose belt at this stage. To trim it up, the belt will need tightening and the timing pulleys for that belt will need to rotate slightly relative to their shaft position. Once this is complete, then the timing pulley position can be "locked", at least until something changes.
It is not clear that loctite mounting will work for this.
I suppose you could use a timing pulley with dual set screws or perhaps some method with threaded rod and nuts.
The cold rolled shaft might work as that is a hardness that is viable for mounting.
What shaft dia. are you thinking about and bearings ?  |