Just glue with whatever you find, with your structural requirements it'll be great! 
When the 10 kg dumbbell had fallen two meters, its kinetic energy was the same as 90 kg falling 22 cm or 110 kg falling 18 cm.
Now, we do not know where the breaking point is, but if we assume that the dumbbell just barely managed to crack the step, then TS should be able to jump from one step down to the next, while someone weighing 110 kg should not do so.
There are certain shortcomings in the calculation, as the human body is more elastic than a dumbbell, but it provides some indication nonetheless. Some designer can surely calculate more accurately on the dimensioning.
Now, we do not know where the breaking point is, but if we assume that the dumbbell just barely managed to crack the step, then TS should be able to jump from one step down to the next, while someone weighing 110 kg should not do so.
There are certain shortcomings in the calculation, as the human body is more elastic than a dumbbell, but it provides some indication nonetheless. Some designer can surely calculate more accurately on the dimensioning.
If you want to prove that TS is wrong about their stairs by knocking them down, you should consider that a dumbbell probably attacks the step on a much smaller area than an average old man's foot (which I guess TS has).
What kind of wood is it? I would look at epoxy like SP, if it's oak there are special glues for that as well. I brought a special glue for oak back from the USA for the boat when the bow split. Unfortunately, I don't remember what the glue was called, but they also sold lingu which is banned here in Europe.
S
sinuslinus
Träskalle
· Östergötlands län
· 6 024 posts
sinuslinus
Träskalle
- Östergötlands län
- 6,024 posts
It never becomes a perfect glue joint when the wood has cracked like that. There's always some small splinter that prevents a perfect fit.Alfredo said:
I would make a new step. Least work/most durable.
Epoxy is a good adhesive and with filler it's strong even as a filler. But the cost of buying epoxy glue exceeds the cost of buying a spruce beam and making a new step.D Danne824 said:
What's forbidden with Lignu epoxy? It's sold in many Swedish stores.
The original was very hazardous to health according to our regulations. Had a really hard time getting the original. So I imported from the US, cost a fortune I can tell you, but being a nerd as I am.S sinuslinus said:
Not to mention the lack of relevance...G gbgustaf said:
That's what I wanted to write.Thomas59 said:
As for "empiricism" TS:
Such empiricism was used in the Middle Ages. Does it hold up? Yes! It's good! But over time, someone noticed that not completely and not always. The King went up the stairs often in robes and it was fine, but he put on armor and now we have to wait for his son to grow up. And someone came up with the idea to introduce a factor of safety. But TS will get acquainted with this when he becomes more open to suggestions.
No... here's a reason to cry...D DanMicke said:
I won't say anything about you insisting on repairing this step, although it is easy to reproduce. And you say you can do without him for a week. May you not forget it when you go down these stairs sleepily at night.