Main Question or Discussion Point
Has anyone here built one before. Ive got a nearly completed one but Im afraid its not stable enough to keep on track.
Doesn't it seem to you that it would be more helpful then for you to post pics and a description of yours and ask specific questions about it. I mean, what good is it going to do you to know that someone else has built one?Has anyone here built one before. Ive got a nearly completed one but Im afraid its not stable enough to keep on track.
It is 1/4 and has a flat I tried to rig it with a peice of plastic in the hole, it looks tight but whenever it has even a little resistance it starts slipping. Im not super familiar with rigging gears I was also having trouble coming up with a way to keep the red gear stable (it does start to tilt up occasionally) how would i go about finding a screw to hold the gear to the motor better and also hold down the red gear, i think that's where im having issues.Good pics and cool project! And I understand your dilema. I have questions.
First. does it drive up opening the angle or down?
How is the gear attached to the motor shaft? It appears to be a decent (1/4" ?) sized shaft. Does it have a flat you could use a set screw on? Is it splined?
Worst case you could drill and pin it. That would solve the slipping and skipping but I still think the majority of your issues are coming from the curve.
With the rod and red gear alone, the gear should spin smoothly along the rod. Any dragging or hanging will only be worse when loaded. A snug fit is working against you. Does the red gear have a threaded metal insert or is it all plastic?
Would it be possible to scale up the radius and run the motor faster? That would give a gentler curve and reduce the error in thread pitch.
In the pic the rod doesn't appear to be a smooth continuous curve. Or is that just an illusion? Where the windowsill is behind the rod it appears to be a shaper bend.
Does the mesh of the gears give you any trouble? From the pics they look ok. But they aren't bevel gears are they?
Under the red drive gear for the rod did you use a bearing surface? (UHMW or similar) That might help as well.