1. H. Dinwiddie EVLA Feed CDR 2/17/05 1 Fabrication and Mass Production Plans for Laminated Feeds L-Band S-Band

2. H. Dinwiddie EVLA Feed CDR 2/17/05 2 Lamination vs Machining To Laminate or Not to Laminate, that is the question Cost effectiveness for large feeds Weight Reduction Proven effective with VLBA L-Band

3. H. Dinwiddie EVLA Feed CDR 2/17/05 3 Laminated Feed Assembly Overview Cut the rings and bands Assemble the rings and bands on a Christmas Tree Laminate the assembly Apply surface finish to the inside of the feed after lamination

4. H. Dinwiddie EVLA Feed CDR 2/17/05 4 Rings Made of 6061T6 Aluminum Sheet Cut at the VLA site by a custom build ring machine Grooved on the edges to accept the bands

5. H. Dinwiddie EVLA Feed CDR 2/17/05 5 Bands Bands are made of 5053H34 Aluminum Strap Cut to length and welded at the VLA site

6. H. Dinwiddie EVLA Feed CDR 2/17/05 6 Rings and Bands Interface

7. H. Dinwiddie EVLA Feed CDR 2/17/05 7 Christmas Tree Feed assembly jig Centers rings and bands Applies pressure during lamination Rotates during the laminating process

8. H. Dinwiddie EVLA Feed CDR 2/17/05 8 The Christmas Tree

9. H. Dinwiddie EVLA Feed CDR 2/17/05 9 Christmas Tree

10. H. Dinwiddie EVLA Feed CDR 2/17/05 10 Laminated Horns

11. H. Dinwiddie EVLA Feed CDR 2/17/05 11 Before and After

12. H. Dinwiddie EVLA Feed CDR 2/17/05 12 Laminated Feeds to Date VLBA L-Band Feeds GBT - 2 Laminated Feeds (S and L Band) EVLA - 2 L-Band Feeds EVLA - 2 C-Bands Feeds Currently Laminating 3 rd L-Band

13. H. Dinwiddie EVLA Feed CDR 2/17/05 13 The Lamination Experience C-Band has a break even point between lamination vs machining from c-cast material L-Band feeds are easier to handle when laminated in two pieces Developed good techniques and tools

14. H. Dinwiddie EVLA Feed CDR 2/17/05 14 Questions?