Starting from the Basics I think I understand the MAB target position now Skin thickness is variable per Zoltan: I use max, min is 100 microns less; ignore I think the ME+1/2 framework is understood, but: Rechecking Celso’s reference points against mine I think the DCOPS line is OK; rechecking Probable source of Z uncertainty is the transfer plate.

This is ME+1 Transfer Plate 1 I want to make sure I understand the reference dowel locations. Are the scales on these CAD drawings accurate? SCALE IS CORRECT Check your Dimensioning Plate is 120 mm x 400 mm CHECK.

Which are the reference pins for the distancemeter reaching the MAB? D are two Dowel Pins in the Plate I assume this is the DCOPS reference dowel YES THAT IS THE HSLM REF DOWEL Shim

A B C D E F G

Position values in CAD layout 15.00.00blk (ME+1/PT1) E: 351.5259, -440.1581 DCOPS dowel F: 351.5259, -433.4301 Center for Cocoa G: 120.5831, -447.4331 XFer DCOPS

Position values relative to center 15.00.00blk (ME+1/PT1) D: 67.5637, 8.2000 E: 0.0000 -6.7278 DCOPS dowel F: 0.0000, 0.0000 Center for Cocoa G: -230.9428, -14.0030 XFer DCOPS

Position values relative to center 15.00.00blk (ME+1/PT1) Name X Y Z A Something else 67.5637 8.2000 64.2101 or 17.3734 B Near DM ref 17.7437 C 60.2000 D Far DM ref 68.5226 E DCOPS Ref Dowel 0.0000 -6.7278 F Center G XFer DCOPS dowel -230.9428 -14.0030 31.9020 To bottom of plate. Or 16.625 to top of mount plate in drawing Notice that the DCOPS is shimmed away from the nominal center

CAD coords to Cocoa TP coords Cad X  CocoaTP X Cad Y  - CocoaTP Y Cad Z  - CocoaTP Z

TransferPlate Model ME+1 Name X (TP coords) Y (TP coords) Z (TP coords) Laser -21.1 48.78 -190 COPSref 6.724 COPSXfer -230.950 19.150 -9.350: typo? COPSXfer CAD -230.943 14.003 -31.902 DistanceMeter 67.529 -17.7 -17.388 DM-CAD 67.5637 -17.7437 -17.373 Or -16.625 PLATE (SLM coords) 7177.683 -48.78 21.1

Comments on previous table Transfer Line DCOPS In the CAD drawing, 9.53mm is the distance to the top of the Transfer Plate, not to the reference dowel for the Transfer Line DCOPS. Suspect the data copied from wrong line. The CAD drawing suggests 14 instead of 19: transcription error? DistanceMeter numbers are quite close I will take the -17.373 number (referencing the bottom of the blue plate) instead of -16.625 (referencing what looks like a mounting surface, but may not be)

ME+1Plate Objects in SLM coords Name X (SLM coords) Y (SLM coords) Z (SLM coords) Laser 7367.68 0.0 COPSref 7177.68 -42.056 21.1 COPSXfer 7187.03 -29.63 -209.85 COPSXfer CAD 7209.59 -34.78 -209.84 DistanceMeter 7195.07 -66.48 88.63 DM-CAD 7195.06 -66.52 88.66

ME+1Plate Objects in CMS coords Name X (SLM coords) Y (SLM coords) Z (SLM coords) Laser 7099.55 1970.65 6782 COPSref 6910.57 1941.85 6824.06 COPSXfer 6979.37 1721.19 6811.63 COPSXfer CAD 7001.15 1727.04 6816.78 DistanceMeter 6909.89 2011.58 6848.48 DM-CAD 6909.86 2011.61 6848.52 DM Z ideal is supposed to be 6847.70mm

ME+1 Plate Objects in Ideal CMS Coords Name X (SLM coords) Y (SLM coords) Z (SLM coords) Laser 7097.40 1971.51 6781.22 COPSref 6908.42 1942.72 6823.28 COPSXfer 6977.22 1722.06 6810.85 COPSXfer CAD 6999.00 1727.90 6816.00 DistanceMeter 6907.73 2012.45 6847.70 DM-CAD 6907.71 2012.48 6847.74 Using 7175.83, -48, 22.493 as Ideal TransferPlate position in SLM instead of PG values