User:FireandIce
Flue Gas Energy Recovery | |
Sponsor: | Nightforce Optics |
Duration: | Fall 2016 - Spring 2017 |
Team Name | Fire and Ice |
Faculty Advisor: | Michael Maughan |
Mentor: | Dillon Savage |
Team Members: |
Currently Nightforce Optics manual impacts each scope that goes through the line, our mission was to make this process automatic. We developed an automatic pendulum to consistent hit the scope. Which can apply different forces depending on the operator's needs. It improved safety and decreases human error.
Problem Definition[edit | edit source]
Background[edit | edit source]
Each and every Nightforce riflescope is impact tested as it goes through the production line. This is currently accomplished by impacting the scope by hand against a padded steel pedestal in multiple orientations. After impact the riflescopes are inspected for damage and functionality. When the production line workers manually impact the riflescopes there are inconsistencies with the impacts throughout the day and amongst the workers.
Design Goal[edit | edit source]
Nightforce Optics is seeking a prototype/proof of concept of an impact device that will consistently deliver a cyclic impact of set value between 200-2000 g’s. The prototype needs to allow the user to quickly remove the scope from the device, hit all sides of the scope, and fit an area smaller than 2’x2’x3’. In addition, the prototype cannot cosmetically damage the scope and needs to operate safely.
Design Specifications[edit | edit source]
Specification | Threshold | Objective |
---|---|---|
Impact Mode | Single impact | Single and cyclic (3 repetitions) |
Impact Region | All four sides and forward impact | 360° capability |
Calibration | Can be calibrated to a specific g force | NA |
Scope removal while testing | Removed and collimated after each side impact and forward impact | NA |
Size of machine | 2'x2'x3' | 1'x1'x2' |
Data collection | Output to laptop/flash drive, record time and g force | Real time output to external screen |
Scope sizes | Attachment method for 30mm and 34mm diameter tubes | universal, adjustable attachment method |
Machine use | Research and development / proof of concept | Production floor ready |
Operator | Anyone should be able to operate | NA |
Time to operate | As long as needed | ≤45s |
Safety | Can not automatically or unintentionally go off | Additional safety guard to protect operator's limbs or fingers |
Surface conditions | Can not damage the surface or bend the trim ring | NA |
Project Learning[edit | edit source]
Underlying equations[edit | edit source]
The Work-Energy Principle states that the change in the kinetic energy of an object is equal to the net work done on the object. since the impacting device will come to a complete stop, the change in its kinetic energy is equal to the initial Kinetic energy.(Average impact force) x (distance traveled) = (change in kinetic energy)for a linear system F*d=1/2 m*v^2 and for a rotational system F*d=1/2 I*ω^2. from these equations we can then estimate the impact force and acceleration felt by the scope
Design matrix for power input[edit | edit source]
Variable | weight | Linear actuator | Electric motor | Mechanical Spring | Pneumatic |
---|---|---|---|---|---|
Price | 3 | 4 (12) | 3 (9) | 5 (15) | 3 (9) |
Speed | 5 | 2 (10) | 4 (20) | 4 (20) | 4 (20) |
Size | 3 | 3 (9) | 5 (15) | 5 (15) | 5 (15) |
Durability | 4 | 3 (12) | 2 (8) | 3 (12) | 4 (16) |
Availability | 2 | 5 (10) | 5 (10) | 3 (6) | 5 (10) |
Ease | 2 | 3 (6) | 4 (8) | 2 (4) | 3 (6) |
Calibration | 5 | 4 (20) | 5 (25) | 2 (10) | 4 (20) |
Weighted totals | 79 | 95 | 82 | 96 |
Design[edit | edit source]
Initial design ideas / Brainstorming[edit | edit source]
Testing and Project Learning[edit | edit source]
A Solidworks based simulation of a pendulum for validating mathematical model and compare theoretical and experimental results. | A rough prototype pendulum used to help understand the efficiency of momentum transfer between a mass and the scope | Data output from accelerometer of a scope being impacted by the pendulum. Notice the high level of noise, this is something we will have to figure out in order to obtain better data. |
Final/Detailed Design[edit | edit source]
Solidworks model of final design excluding the pneumatic hoses, regulator and actuator. | Variable length pendulum arm with replaceable tread on heads. Part is made with a solid shaft machined to slide inside an outer pipe. Picture depicts a CATIA finite element analysis that was performed on the part. | Modified scope rail to allow for scope turret clearance and holes with counter-bores for attaching the rail onto the T-slot Aluminium rails. |
Finished Product[edit | edit source]
The final, manufactured riflescope scope impact testing device. | Top view showing the scope mounting system. | Side view showing the protective Plexiglas shielding and custom laser engraving. |
Team Information[edit | edit source]
Document Archive[edit | edit source]
Meeting Minutes[edit | edit source]
- September 10th 2015
- September 14th 2015
- September 17th 2015
- September 25th 2015
- October 1st 2015
- October 8th 2015
- October 15th 2015
- October 22nd 2015
- October 29th 2015
- November 2nd 2015
- November 9th 2015
- November 16th 2015
- November 30th 2015
- December 7th 2015
- January 15th 2016
- January 20th 2016
- January 21st 2016
- January 25th 2016
- January 28th 2016
- February 15th 2016
- February 25th 2016
- March 3rd 2016
- March 24th 2016
- March 31st 2016
- April 7th 2016
- April 21st 2016
Schedule[edit | edit source]
Project SchedulePresentations/Reports[edit | edit source]
Detailed Design Review Power Point
DFMEA (Design Failure Mode and Effect Analysis)
Other[edit | edit source]
InterviewWiring Diagram