Weighted dips and chin ups

[The Light Among Darkness]

I never tried that high weight on dips but I was able to do about 6 reps with 40 kg on chin-ups while weighing 66-67 kg myself. It took me around 7 months but I didn't train for it. I was just doing 3 sets with 15 kg, then 20 kg, then 25 kg, then 30 kg, then 35 kg and finally 40 kg. Though I wasn't able to do even 3 sets of 5 with 40 kg. It was more like 6, 4, 3 with 3-4 minutes rest. My program was 3 heavy sets and 2-3 bodyweight(usually 2). I was doiing upper-lower every 4-5 days.  Also I was resting 3-4 minutes while doing weighted and 1-2 minutes for bodyweight.

You can reach your genetic potential with bodyweight. Why possibly hurt yourself with heavy weight.

I never had problems from going heavy on chin-ups, dips were another story though, I had frequent little chest/triceps strains so that's why I decideed to go for no less than 10 reps on everything. Though I find it that going to failure can still cause strains, even if it's higher reps. That's why later I decided to train based on feeling and not go to failure, just close to failure. Mostly because after you get at a certain level you can't always perform well, so even going for the same reps you did 3 weeks ago can be dreadful.

That is true- Progression slows down to a crawl and you may be lucky to add 1 rep a month at some point, so training by feeling is a good idea. 7 months to chin 90 lbs? Pretty good.