The two (thousand) bullet error
I received all the electronics: boards and components. Everything is planned with the subcontractor.
The assembly of the electronic cards (welding) will therefore begin on Wednesday. I'll be there with a camera − I know there are curious people 🙂
Yoouuuuuh! On and est presque.
The two (thousand) bullet error
Almost. One was needed, and it finally arrived, the error.
So it's on the hulls received last week. At the level of the bosses (= fixings) in which the screws are screwed. Something for which there are some constraints to respect. Like this:
Good. Basically I messed up the diameter of the hole − I made it a bit too large. I had put the value recommended by the manufacturer of the screws, but I was fooled by the draft angle = inclination of the hole which is conical. So, I have the right measurement, but not in the right place.
In the end, there is too little delta between the tightening torque (3) and the breaking torque (4).
Translation: You just have to tighten a little too much to mess up the thread. Normal what. Except that there, the very little corresponds to really not much.
Anyway. I preferred to play it safe: I had the mold modified and the parts redone.
Fortunately, it is a subcontractor who works quickly. I will have the new parts in a week. So no impact on the delivery date, only for the portfolio.
Obviously, this is something I hadn't seen with 3D printing prototypes. Quite simply because the manufacturing tolerances are not the same.
Life goes on
We're not going to die because of a small mistake...
I should soon receive the other parts that are still missing: axles, bearings. I found labor to hire for the final assembly.
And during all this time, I continue my work on the software part.
Brief. There will be plenty more to tell next week.
7 thoughts on “ The two (thousand) bullet error »
hey, bac+0! These are details that are likely to be picked up in school (and often not printed) or learned on the job and remembered forever. Here it is done 😉
Good continuation.
hello, stupid question, bigger screws or with wider threads can't do anything about it?
But I'm sure you've already thought about it?
Hey, you're sure that's the only thing that's wrong because ay be... 😉 finally contributing to such a work is really good for me!!!
Bert
A draft in a thread hole? I drank too much last night or I didn't understand the sentence.
a thread hole has no draft. the diameter must be the same from top to bottom.
Draft is used when you are casting only. not in the parts to be machined.
There it would have been necessary to make pre-holes (to save the material) then to make the drilling then with drills. Either at home by spending time there with a standing drill and a wedging system to systematically respect the center distances of your part holes, or in the factory (but more expensive).
I agree with the first message, it is by logging that one becomes loggers, But some opinions before can save 2000 balls
In case ! to recover crappy holes (unless the thickness around the hole is too small) there are HELICOIL type products. But it is not planned for the big series. Otherwise you can leave your bank details directly with your supplier… 🙂
As you say, the body is used when we do molding. This is the case here.
The threads are not machined or tapped. I use self-drilling screws. It is normal to have draft in these holes.
Ok so it's just a small miscalculation...
Come on, it's the home stretch, it smells good there. You're one step away from the bowl of sangria.
hey nicolas,
do not worry. it's part of the game. this year i've fucked away foundry models for well over 2000 bucks...
“The only man who never makes mistakes is the one who never does anything”
Theodore Roosevelt