3D Printed Broaching Press

Published on June 30, 2024
Duration: 8:38

This video details the construction and use of a 3D-printed broaching press designed to create precise hex holes in 3D-printed SL9 bolt hold open levers. The creator explains how inconsistent tolerances in commercially available aluminum hex shafts and the nature of 3D printing led to issues with lever fitment, necessitating the development of this specialized tool for improved reliability in firearm component kits.

Quick Summary

A 3D-printed broaching press is used to create precise hex holes in SL9 bolt hold open levers, addressing inconsistent tolerances in commercial parts. This DIY tool, made from PLA, aluminum, and steel, ensures reliable fitment by overcoming the inherent rounding of 3D printed corners, which can lead to loose or tight lever engagement.

Chapters

  1. 00:00Introduction to the 3D Printed Broaching Press
  2. 00:35Compounding Issues: Shaft Tolerance and Lever Fit
  3. 01:10The Problem with 3D Printed Hex Holes
  4. 02:38Solution: Custom Shafts and Broaching
  5. 03:513D Printing Design Considerations: Layer Adhesion
  6. 04:27Quill Head Design and Orientation
  7. 05:05Hardware and Design Refinement
  8. 05:28Metal Structure vs. 3D Printing
  9. 05:59Custom Brass Bushings and Smooth Action
  10. 06:41Nut Placement and Structural Efficiency
  11. 07:22The Jigs: Holding Levers for Broaching
  12. 08:07Conclusion and Future Content

Frequently Asked Questions

What is the primary purpose of the 3D-printed broaching press shown in the video?

The 3D-printed broaching press is designed to create precise hex holes in 3D-printed components, specifically for SL9 bolt hold open levers. This is necessary to overcome inconsistent tolerances in commercially available parts and ensure reliable fitment.

Why are standard 3D printed hex holes problematic for firearm components?

3D printed parts with sharp corners are inherently rounded due to the printing process. This rounding prevents perfect engagement with hex shafts, leading to levers that are either too tight or too loose, impacting the reliability of firearm mechanisms.

What materials are used in the construction of the 3D-printed broaching press?

The broaching press is constructed from 3D printed PLA parts, aluminum flat stock, various hardware components, and a steel rod for the quill. Custom brass bushings are also used for smooth joint operation.

How does the creator address inconsistent tolerances in SL9 bolt hold open shafts?

The creator addresses inconsistent tolerances by using custom-made steel bolt hold open shafts, which have precisely machined flats and perfect tolerances. These are then paired with broached hex holes in the levers for a secure fit.

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