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Found 1 result

  1. Has anyone unglued and reglued an eyepiece doublet? In order to solve some problems that I was having, with a Celestron 4mm Omni Plossl, the eyepiece was dismantled. The scope-side doublet was found to have been misaligned during assembly : I'm guessing that the lenses are superglued together. The method that I'm considering, would be to place the lens, flat(ish) side down, on wood, in a pre-cut delve, probably adding panel pinning for stability ... and place in the oven. Over-cook the lenses, in order that they stay above the bond temperature... Using plastic pincers, and a piece of card ... clamp to wood, and apply the micrometer anvils (or vice versa - probably less risky). Then leave it ... hoping that the bond remakes. I'd be loath to apply liquid superglue, because it is likely to wick through the gap. I need 'gel superglue', to reinforce what I would hope would be auto rebonded lenses. It sounds simple enough, but it's a task that can easily go wrong, and end up with superglue being smeared across the lens faces. This is why I'm thinking that panel pins would be a good idea. Another Risk might be glue vapour. Over-cook yes ... but not enough to vaporise the glue. Anyway, that's one current planning option. Perhaps another method would be to melt the glue in boiling water (if it will melt), and then clean off the lenses with acetone. ... before cold gluing. The other option is to leave the task for the moment, and re-benchmark the eyepiece after completing the various required mods. ... but, it's out, it needs doing, and after a few practice runs, the actual task might be done in under 30 seconds. Either way, the task needs reviewing. If anyone has any prior experience in this area ... I'm all ears
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