I’m assembling my Longmill 30x30 today.
It looks line one of my ACME nuts was manufactured incorrectly – the bolt is supposed to cut across the slot in the nut. One of my ACME nuts has the bolt on the opposite side of the slot – where it does nothing.
This seems so strange that I feel compelled to ask – in the photo, the top one is a good nut, the bottom one is the bad one. I’m not missing something here, am I? Thanks!
@LarryCoon I don’t have a Longmill so I don’t know what you are supposed to get.
But the bottom nut sure seems wrong.
LOL … automation gone terribly wrong 
In my quality/repair dude years I had a lil box where I put in all the weird things that was found during assembly of electronic devices. Screws without screw treads, without a philips or torks or with double heads, treads the wrong way around but also components with blown tops revealing the inside or leds with two anodes, ic’s with wrong polarity indication, ballgrids without balls, gullwings with one leg upside down. The list is endless.
The box was a reminder to keep vigilant, because producing in bulk means that something “weird” will eventually slip through the safety net. No matter how good quality control (automated, human or combined) is set up to be. Things can look fine when glanced quickly. (Like your acme nut does.)
I can see it slipping through with ease. I also can see quality control scratch it’s head when they get your ticket.
Please do write a ticket for this, because it will help Sienci give a heads up about these components and maybe check their stock or give packaging a warning about these. There might be more than one weird ones out there.
Follow-up – I did raise a ticket with Sienci, and they’re sending me out a new nut. I’m using a standard collar stop until it arrives, and will watch it closely. Thanks all for your replies.
