1 / 27

Design and Fabrication of a Two Axis Benchtop Milling Table

Design and Fabrication of a Two Axis Benchtop Milling Table. Presented By: Corey Hoff, Taylor Groll, Thao Lai, and Rick Lopez EGR 367 – Manufacturing Processes December 10, 2004. Description of Need. Translational motion in x and z axis Capable of machining plastic

rad
Download Presentation

Design and Fabrication of a Two Axis Benchtop Milling Table

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Design and Fabrication of a Two Axis Benchtop Milling Table Presented By: Corey Hoff, Taylor Groll, Thao Lai, and Rick Lopez EGR 367 – Manufacturing Processes December 10, 2004

  2. Description of Need • Translational motion in x and z axis • Capable of machining plastic • Dovetail type runner assembly • Provide additional support for Engineering 101 students • Provide a wider range of travel than current GVSU benchtop milling machines

  3. Microkinetics Desktop CNC Milling Machine • Hardware • Motor Capacity – 470 oz/in stepper motors • 8.25in x 28.5in Table • 17 in x-axis travel • 7 in y-axis travel • 5 in z-axis travel • Cost • Starts at $7,995.00

  4. Hardware Motor Capacity – 145 oz/in stepper motors 12.9 in x 13.9 in Table 10 in x-axis travel 10 in y-axis travel 12 in z-axis travel Cost Starts at $2,495.00 MAXNC 15 Desktop CNC Milling Machine

  5. ProLightTM 1000 Machining Center • Hardware • Motor Capacity – 150 oz/in stepper motors • 19.5 in x 6.25 in Table • 12 in x-axis travel • 6 in y-axis travel • 9 in z-axis travel • Cost • Starts at $16,995.00

  6. Proposed 367 Milling Table Design • Hardware • Motor Capacity – TBD • 12.9 in x 13.9 in Table • 16 in x-axis travel • 10 in y-axis travel • 10 in z-axis travel

  7. Existing Products and Design Comparison

  8. Material Selection • Steel vs. Aluminum Considerations • Weight of Milling Table • Corrosion & Wear Resistance • Machinability • Cost of Steel • G.R. Central Iron & Steel – Supplier of Aluminum Alloy 6061-T6

  9. Design Calculations • Machining time total = 43.43 hours

  10. Pairwise Comparison Using Digital Logic Method , n = number of goals

  11. Decision Matrix

  12. Bill of Materials • Aluminum Alloy 6061: Flat Stock

  13. Design Considerations • Avoid use of round or tubular ways • Eliminate Gibbs • Utilize adjustable saddle ways for elimination of table slop • Light weight • Simplistic Design

  14. Previous Design Adjustment Screws Gibbs

  15. Proposed Design – X-Z Milling Table

  16. Proposed Design - Saddle

  17. Proposed Design - Bed

  18. Gantt Chart

  19. Revised Design • Less z-direction travel – 10 inches • Elimination of keyways • Steel inserts • Flat head hex bolts • Lithium grease

  20. Revised Bed

  21. Fabrication Procedure • Cut stock AA6061-T6 • Mill surfaces • Drill holes • Discrete fasteners • Addition of lubrication

  22. Final Milling Table

  23. Final Milling Table

  24. Project Issues Encountered • Tolerance stack-up • Alignment of essential components • Precision & accuracy of milling machines • Machine setup time • Actual machining time ≈ 130 hours • Complexity of design

  25. Test Results • Force • Static friction coefficient, μs = 1.55 • Kinetic friction coefficient, μk = 0.33 • Surface roughness, Ra = 0.517 μm

  26. Future Considerations • Ways & base machined from single pieces of stock material • Reconsideration of material choice • Need a different method for adjusting amount of slop between the saddle and bed • Address issue of single sided wear on x-axis • Aluminum anodizing of wearing surfaces

  27. Questions?

More Related