Thermal Treatment for Optical Bench (tentative)
10 Jan, 2001 nishi + tokoku
Preperation : Surface Plate, Heater, Liquid Nitrogen ( ?L ), Container, Thermometer
Procedure :
1. [ Before Grinding ] Measure dimensions on the surface plate.
2. [ Before Grinding ] Repeat (a-d) twice.
a) Cool to LN2 temperature. Cooling time approx. 30 minutes.
___Hold for 30 minutes.
b) Heat to room temperature with heater and hold for 15 minutes.
___(Do not exceed 120 degree C.)
c) Heat to 120 degree C and hold for 15 minutes.
d) Cool to room temperature.
3. [ Before Grinding ] Measure dimensions on the surface plate.
4. [ First grinding ] Remove 0.5mm max per surface.
5. Repeat (a-d) twice.
a) Cool to LN2 temperature. Cooling time approx. 30 minutes.
___Hold for 30 minutes.
b) Heat to room temperature with heater and hold for 15 minutes.
___(Do not exceed 120 degree C.)
c) Heat to 120 degree C and hold for 15 minutes.
d) Cool to room temperature.
6. Measure dimensions on the surface plate.
7. [ Hereafter... ] Thickness to remove, cooling time, and number of cooling cycles
___depends on the measurement result.
8. [ Finish ] Measure dimensions on the surface plate.
* This operation to be done under the supervision of STM personal.