HelpingNoone
kiwifarms.net
- Joined
- Oct 31, 2020
I'm sure it could be done with different tooling; but a 0.15mm range just seems hopeful when their surfaces look like this:According to the screenshot, it's an unequal tolerance band, biased toward under nominal. +.05mm -.10mm or roughly +.002"/0.004". Realistically the .05mm true position tolerance with Max Material Condition modifier would be more troublesome than the distance between the edges of the "rails". On such a small, precise part, you're using progressive dies and with good process control and tooling including quality inspections, it does not look like a difficult spec to meet IMO. Especially since it's biased toward undersized so with good tooling designers and process control, you can bias your production to result in slightly under nominal parts where the tolerance band is larger and avoid any over max condition parts that would have to be corrected by machining or discarded if they violate the true position + MMC.
Obviously, I'd need to see the whole drawing including the notes to give you a full breakdown on whether the FCU frame is actually a hard part to meet spec on, and would need the drawings for every part in the FCU and slide to tell you if a within spec worst case stack would be unsafe (it shouldn't be, that would be a major engineering blunder). A full stack up on every part involved would be damn time consuming though, so I wouldn't want to do it lol

But true we don't really have the full story about the drawing.

