1. TMT.OPT.PRE.15.020.REL011 SSA Tower Rework Instructions (for composite sleeve bearings) F. Kamphues

2. SSA Tower rework Reason: Implementation of composite sleeve bearings for the Tower Locks TMT.OPT.PRE.15.020.REL012

3. Scope of Work Required modifications in accordance with drawing M1S-100-01301 Prototype V3 Rework Composite Brg REV A –Tower M1S-100-01301: Tower Lock holes to be increased from 22 to 27 mm Drill, tap and install M4 helicoil in each “ear” for end stop Install GGB 222718GF sleeve bearings (press fit) Drill and tap through side of sleeve bearing (for Spring Plunger) 3X 1/2-13 UNC-2B THROUGH TO BORE, BACK SIDE CHAMFER 2.00 X 45 –Lock Assembly M1S-100-01400: Deburr edges of spring plunger detents TMT.OPT.PRE.15.020.REL013

4. Scope of Work TMT.OPT.PRE.15.020.REL014 M1S-100-01301 Prototype V3 Rework Composite Brg REV A:

5. TMT furnished equipment TMT provides GGB 222718GF sleeve bearings TMT provides 1/2-13 UNC-2B Delrin Spring Plungers TMT provides Machining Fixture –With registration pins and datum surface for accurate location of Tower –A setup for bearing holes and M4 helicoil hole machining –B setup for drilling & tapping spring plunger holes TMT.OPT.PRE.15.020.REL01 5 A B

6. TMT Machining Fixture Machining Fixture (arrow side is datum) TMT.OPT.PRE.15.020.REL01 6

7. Preparation of Towers Anodize Tower in accordance with drawing Install Registration Inserts M1S-100-01304 TMT.OPT.PRE.15.020.REL01 7

8. Installation Procedure Setup A - 1/5 Installing brass registration pins in Machining Fixture (location A) TMT.OPT.PRE.15.020.REL018

9. Installation Procedure Setup A - 2/5 Install and Align Machining Fixture on CNC machine. Arrow side is datum and should be perpendicular to machining axis. TMT.OPT.PRE.15.020.REL019

10. Installation Procedure Setup A - 3/5 Install Tower on brass registration pins. Install clamps TMT.OPT.PRE.15.020.REL0110

11. Installation Procedure Setup A - 4/5 Install anti-chatter support (with very light preload to prevent deformation in the clamped state!). –Support is not provided by TMT (use a threaded rod with two nuts, or similar) TMT.OPT.PRE.15.020.REL0111

12. Installation Procedure Setup A - 5/5 Check alignment and CNC software before starting machining! TMT.OPT.PRE.15.020.REL0112

13. Machining Setup A Machine holes to 27.000 – 27.021 mm Drill and tap for M4 helicoil Repeat for other two “ears” (rotate 120°, 240°) TMT.OPT.PRE.15.020.REL0113

14. Install sleeve bearings Press fit sleeve bearings (3x) in accordance with GGB Composite Bearing Handbook section 6.1 –Bearings shall be installed 0.2 - 0.5 mm deeper than flange (to accommodate lock barrel radius) TMT.OPT.PRE.15.020.REL0114

15. Fit check lock barrels Fit check lock barrels (bearing does not require lubricant) TMT.OPT.PRE.15.020.REL0115

16. Installation Procedure Setup B - 1/3 Move brass registration pins from location A to B) TMT.OPT.PRE.15.020.REL0116

17. Installation Procedure Setup B - 2/3 Install Tower on brass registration pins. Install clamp TMT.OPT.PRE.15.020.REL0117

18. Installation Procedure Setup A - 3/3 Check alignment and CNC software before starting machining! TMT.OPT.PRE.15.020.REL0118

19. Machining Setup B Drill and tap for Spring Plunger –Carbide drills should be used for drilling GGB filament wound bearings. To avoid fiber breakout, use a mandrel to support the ID. TMT.OPT.PRE.15.020.REL0119

20. Machining Setup B Apply backside chamfer in tapped hole (may be done by hand; chamfer size is not critical) Repeat for other two “ears” (rotate 120°, 240°) TMT.OPT.PRE.15.020.REL0120

21. Fit check Spring Plunger Fit check Spring Plungers (should be able to go all the way through) TMT.OPT.PRE.15.020.REL0121

22. Deburring Spring Plunger Detents Hand deburr detent edges with round grinding wheel and fine Emery cloth. Edges shall be round and smooth! TMT.OPT.PRE.15.020.REL0122