Re: Threads stuck on an AP Field Flattener
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Be careful using freezing methods with cells that hold optics. They could
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contract too far and crack the optics. AP machines the cells for large optics a tiny-bit bigger if they know that they are going to extreme-cold climates. Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com
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From: ap-gto@... [mailto:ap-gto@...] Sent: Monday, July 14, 2014 11:10 AM To: ap-gto@... Subject: Re: [ap-gto] Threads stuck on an AP Field Flattener To free parts that are already seized, use plumbers pipe freezer spray on the part you want to CONTRACT.... ...and a hair dryer (or heat gun, _very_ carefully) on the part you want to EXPAND. To stop parts EVER seizing again, use COPPER GREASE - it's whole purpose in life is to stop parts seizing. COPPER GREASE is available widely from plumber's merchants, DIY stores, etc). Can use it anywhere (sparingly, with a cotton bud on small parts). I just use my finger for applying to larger parts, like the counterweight shaft. I've only had to apply it once, about 14 years ago. The counterweight shaft has never seized since then. After removing the shaft (for transport) I simply put the screw end in a plastic bag with a rubber band round it. This stops debris getting into the grease. Philip -- Philip Perkins <ppml5@...> Wiltshire UK & Luberon France www.astrocruise.com -- Note: the above email address may change in future. To find my latest email address please visit: www.astrocruise.com and click the "Send Email" link. -- ------------------------------------ Posted by: Philip Perkins <ppml5@...> ------------------------------------ To UNSUBSCRIBE, or for general information on the ap-gto list see http://groups.yahoo.com/group/ap-gto ------------------------------------ Yahoo Groups Links
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