Radial defining system for the Blanco primary mirror

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Presentation transcript:

Radial defining system for the Blanco primary mirror V. M. Blanco 4-m Telescope Andres Montane 11/26/2018

Parts involved Support Base Primary Mirror Definition Point Mirror Cell Counterweight Support Base Andres Montane 11/26/2018

Parts involved Support Base Support Base Primary Mirror Nut Definition Pad Definition Point Definition Point load cell Belleville Spring Washers Support Base Support Base Andres Montane 11/26/2018

It is necessary to absorb 1.2 mm for thermal contraction movement load cell movement It is necessary to absorb 1.2 mm for thermal contraction Preload 250 Kg Nut Belleville Spring Washers Andres Montane 11/26/2018

Belleville Spring Washers Andres Montane 11/26/2018

Belleville Spring Washers Andres Montane 11/26/2018

It is necessary to absorb 1.2 mm for thermal contraction Belleville Spring Washers adjustment screw Andres Montane 11/26/2018

Parts involved load cell Andres Montane 11/26/2018

load cell Resolution = 200g Andres Montane 11/26/2018

Space and position of the definition point Primary Mirror Definition Point Ring Girder Andres Montane 11/26/2018

Space and position of the definition point Mirror Cell Support Base Ring Girder Andres Montane 11/26/2018

Sartorius Load Cell Electrical Specifications Output impedance = 635ohms Sensitivity = 2mv/V at Rated Load Repeatability = <0.1% of Rated Load Elastic Deformation =<0.1mm at Rated Load Load Cell Diagram Andres Montane 11/26/2018

4m Load Cell Electronics Block Diagram North Load Cell x100 ADAM 6017 8Ch 16bit A/D x100 East Load Cell Ethernet South Load Cell x100 x100 West Load Cell +/-5V Supplies 115VAC Andres Montane 11/26/2018

4m Load Cell Location on Telescope South Load Cell 4m Mirror Cell East Load Cell West Load Cell 19”Rack in Cage Electronics Ethernet North Load Cell 115VAC Andres Montane 11/26/2018