8”#mcp#transporter#update# … · mcp #=8.003in# #Δl#=.011in# •...
TRANSCRIPT
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SSL
8” MCP Transporter Update (response to MCPs damaged in
shipping)
Jason McPhate & Jeff Williams LAPP Tuesday Telecon
7 August 2012
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SSLJeff’s piece part measurements Transporter Bases
2
8.014±.001
8.014±.001
.0300±.0015
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SSLJeff’s piece part measurements MCPs
3
8.003
.0475±.0025
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SSLThermal ContracIon?
• Transporters are aluminum, TCE = 24 µin/in/°C. • MCP glass has TCE = 5.5 µin/in/°C. • lBase = 8.014in, lMCP = 8.003in Δl = .011in • Requires a temperature change of -‐74°C for the MCP to get Ight in the transporter base. (i.e., T ≈ -‐50°C)
• Googling “fedex cargo hold temperature” turns up a paper that measured this. Max temp swings were closer to 15°C. (h_p://Inyurl.com/cyzt7lp)
• Nope.
4
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SSLExisIng Spring Design
5
Area of spring applying “extra” force at corner?
MCP
Bit of a hand waving argument.
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SSLRevised Spring Design (updated INCOM design agrees)
6
Eliminates “extra” force or any corner pinching of spring.