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Of importance is also that the screw driver shaft is inherently torque-limiting as it is slightly flexible. So if the screw is very tight and cannot tighten anymore, rotating the screw driver two turns cannot break the screw driver as that is within the allowable torsion limit. That is why the...

The screwdriver is connected to a screw that is threaded into a hole. It is required that the screwdriver rotate exactly two full turns once the screw is fully seated in its threads. However, the screw will not be fully seated at the start of the torqueing process, and it is impossible to...

Ah yes, I supposed I should have provided the important detail that this is for a disposable medical device, so an expensive electronic solution is not viable.

"I meant, what happens to the mechanism; apparently the user can continue turning until it re-engages." I see. Yes, the gears will re-engage. It is necessary to perform the torqueing cycle a minimum of three times (this is to ensure the screw the screwdriver is attached to is fully bottomed out...

Thanks for the reply, Dave. "What part is driven" - The planet gear is driven and the ring gear is manually turned by the user. "What part drives the screw" - the planet gear "What happens if the user doesn't stop" - The screw driver will exceed its torque rating and break "how is the "count"...

Correct me if I'm wrong, but a power drill clutch limits torque whereas I am trying to limit number of rotations.

Oh yeah, that makes sense. Something like this? This is definitely a low-load application, so that might work!

Thanks for your response. The spur gear is driving a screwdriver-like component. I want to design the gear mechanism such that the user can only ever rotate the screwdriver a prescribed number of turns, no matter what. After each screwdriver torquing cycle, the torque must be released (hence...

See this illustration of the gear set up I have. I want to create a design where there is a gap in the teeth of the ring gear. This allows the planet gear to free-spin during part of the ring gear's rotation and then re-engage during the rest of the rotation. The challenge I'm facing is...

Looks like my ASCII table formatting got mangled. I've attached a screenshot instead.https://files.engineering.com/getfile.aspx?folder=4f244e72-6205-4b04-abd5-e35b0dc5ee74&file=Capture.PNG

Thanks for the detailed reply! When offloading quality requirements to a separate document from the drawing, does that typically include inspection plans as well (ie inspect critical dimensions with AQL = 4.0)? I ask because inspection plans are unique from part to part, so it complicates...

I'm currently working on engineering drawings for a series of parts. We have about 50 parts that all share the same quality requirements related to cleaning, inspection, packaging, and documentation. This means if any of those requirements change, we have to update 50 drawings which is way more...

How are inspection plans that are separate from drawings usually constructed? Does each drawing get its own inspection plan document? Or do multiple drawings refer to the same inspection plan document? Some combination of the two? How does this work with sending inspection plans to vendors...

CWB1, thanks for the reply. It makes perfect sense, but just for my own understanding, where in Y14 does it indicate "the design print describes the part, not the manufacturing or inspection process"?

Correct, they aren't dimensions. Just instructions about how our internal team should perform inspection on the part that we receive.

"If I were the vendor, the information than only some specific dimensions are going to be checked by my customer as a part of their in-house incoming inspection could be quite valuable and I wouldn't necessary want to admit it to the customer" That is a compelling point...

"why do you care what the supplier sees that does not apply to them?" Ultimately I don't, but the way our documentation is set up I think it makes no sense to put our incoming inspection on the drawing, and I would prefer if everything we do at the company flows in a logical way. For additional...

To be clear, "In-house incoming inspection requirements" is for internal use when we receive the parts made by the vendor. It would not be in the purchase agreement.

Currently our engineering detail drawings that we send to vendors to manufacture components, we have the following included under "Inspection". (1) Visual and dimensional inspection requirements for the vendor making the part (2) In-house incoming inspection requirements (checking certificate...