Discussion Overview
The discussion revolves around drilling a hole for a #6-32 UNC bolt in plexiglass, focusing on hole size, threading requirements, and considerations for using nuts. Participants explore various drilling techniques and the implications of using plexiglass in this context.
Discussion Character
- Technical explanation
- Debate/contested
- Experimental/applied
Main Points Raised
- One participant inquires about the appropriate hole size for a #6-32 UNC bolt and whether threading is necessary when using a nut on the opposite side.
- Another participant provides links to tables for tap and drill sizes, suggesting that a clearance hole is needed rather than a tapped hole.
- A participant cites their Machinery's Handbook, stating that a normal fit clearance hole for a 6-32 screw is a #18 drill (.170") and a close fit is a #23 drill (.154").
- There is a suggestion that drilling a hole of .154" would allow for a tight fit with the bolt and nut, prompting a follow-up question about the implications of hole size on stability.
- Concerns are raised about aligning multiple holes and the need to consider tolerances if multiple holes are involved.
- One participant warns against bolting plexiglass, especially outdoors, due to its high Coefficient of Thermal Expansion, recommending oversized holes and specific tightening techniques to prevent cracking.
- A later reply clarifies that the project will be indoors, reducing concerns about temperature variation and mentioning the use of two layers of plexiglass with load cells in between.
Areas of Agreement / Disagreement
Participants express differing views on the best practices for drilling and bolting plexiglass, with some advocating for specific hole sizes and techniques while others caution against bolting altogether. The discussion remains unresolved regarding the optimal approach for this application.
Contextual Notes
Participants reference various sources for drill sizes and techniques, but there is no consensus on the best method for drilling and securing bolts in plexiglass, particularly concerning temperature effects and alignment of multiple holes.