SBH:
Interesting. Feel free to post a simple conceptual sketch of your construction. It doesn't need to be an advanced drawing. All tips and ideas are gratefully received
With the door attached to the beam you get:
A KKR 50x30x3 has I = 128000 mm4, resulting in a deflection of 6 mm.
The calculation applies without wire stays.
With the wire stays, you can lift the door's sag.
Skipping the counterweight makes it easier to open and close the door.
Yes, but that's absolutely brilliant!
It's an advantage to reduce the total weight by skipping the counterweight. The door will still feel stable and solid, as we want it, since I suspect the total weight will be around 80kg with pipes and all.
A small concern is whether I can adjust the change in angle of the bottom beam that occurs when I remove the counterweight and let the rear wheels rest against the upper edge of the track instead. The difference between the wheel diameter and the internal height of the track is about 6mm and there is very little room for adjustment where the beam attaches to the wheel!
If it doesn't work, we can just put the counterweight back!
Do you have any suggestions for a simpler construction than this? Referring to SBHs post! I find it hard to see how we can achieve stability at the bottom and top, as well as adjustment possibilities, with a simpler construction when it comes to such a heavy door leaf!
A fair amount should be adjustable with the wire. Direct the cable force into the door leaf without detours, and place the other attachment point near the front wheels, and it should be fine. With a turnbuckle, you can fine-tune the angle.
If you want to compensate for the slack in the track in another way, you can insert a metal strip, e.g., 5 mm thick, at the bottom of the track, which will raise the rear wheels a bit. This assumes, of course, that the wheels are to run against a flat surface.
Otherwise, I don't have any better suggestions offhand, but it would be interesting to see SBH's solution.
Thank you so much for the tips and an enormous thank you for the help. I'll upload a couple of pictures when it's finished so you can see the final result.
Best regards,
Himneck
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