Bolster Rivet Press

Goal Statement
Create test fixture and associated calibration methods to measure the required force to optimally compress and seat rivets in the production of knives. Provide assistance to both designers and machine operators that improves the quality and consistency across a spectrum of knife families.

Sponsor
This Project is supported by

Buck Knives

660 S. Lochsa Street

Post Falls, ID 83854-5200

Background Information
Buck Knives currently produces several common knife models that are held together with a bolster rivets. Last year, Buck Knives supported a senior design project where the team was tasked with creating a machine that inserts pins into three locations in the knife. This year we started out re-creating a bolster rivet press to press these pins to hold the knife together. Initially Buck Knives thought they wanted there old bolster rivet press for there 110 and 112 models replaced. Later they realized that having precise force measurements and a calibration device would be more beneficial. The calibration device would not be for the one press but all that they currently are using for manufacturing knives.

Design Specifications

 * Device is of universal design
 * Fits all presses in operation (required)
 * Compatible with a standard laptop (desired)
 * Produces accurate readings
 * Measure force (required)
 * Measure displacement (desired)
 * Control load w/manual actuation
 * Readouts
 * Built in display or
 * Displays on laptop (desired)

Satec Testing


Before starting testing we determined there were four critical conditions that had to be met. The pins had to be press hard enough to hold the knife together well and to keep the knife blade stable but not pressed to the point that it will hinder the knife's ability to open and close. Also the knife could not be physically damaged by the pressing process. Though testing with the satec machine we have discovered the optimal force to be used one each rivet is in the range of 20000-22000lbf. In this optimal range all four conditions and were all satisfied.