Talk:Babyproof door knob lock

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We received your report, and you have some interesting results, but we would like to see some additional detail in a few areas. Comments follow:

  • Please include a picture of the product at the top of the document. We have added a picture at the top of the page.
  • Good intro in executive summary, but please put your findings and conclusions up front so that we don’t have to dig for them. The executive summary has been edited to reflect these comments.
  • Good description of basic customer needs, but it may help to list more depth on issues such as safety, durability, etc. Additional issues such as safety and durability addressed.
  • A functional description detailing how the doorknob works appears to be missing. Such a description, with a figure to aid explanation, would make the functionality much more clear. We added a figure to help explain the function of the doorknob.
  • Great parts list - are the parts of unknown use unnecessary? Is the inner doorknob a single component or an assembly? Is every component of quantity 1? Thanks! The unknowns are defined, we purchased another doorknob and did some research on what each of the unknown functions are. The inner doorknob picture (part #32) consists of two parts, the doorknob itself and part number 43. They are disassembled, but picture #32 on the wiki is an old image we took before removing part 43 from the knob. Quantity of each part is one unless specified under the Name column (eg. screws x2).
  • Interesting thoughts on DFMA - do you have suggestions for improving the latch design for assembly? Suggestions added under Design for Assembly
  • Your FMEA is just a data table - what are your major findings and recommendations? Findings and Recommendations have been added under the FMEA section.
  • Would an increased tab size improve friction force for turning the knob? Friction force is normal force times mu - surface area doesn’t seem to be part of the equation...The tab issue is now addressed in the FMEA section.
  • Is there also a possibility of children working the cover off of the doorknob - or on the other hand adult users having difficulty removing the cover from the doorknob? This part is added under "product use".
  • The explanation of quantitative analysis appears reasonable, but the actual numbers appear to be missing. What are the estimated forces for this design? The estimated forces have been inserted along with calculations.
  • How would incorporation of the doorknob cover into the doorknob itself reduce manufacturing emissions from your LCA? As mentioned at the end of DFE, toxic and greenhouse gases are the largest contributing factors in both sectors. However, emissions from plastic manufacturing are an order of magnitude higher than those for metal. Therefore, if the plastic covers could be eliminated altogether and are incorporated into the actual doorknob, emissions averages will decrease.
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