2 replies to this topic

[cloudsabove]

I have a 2" mead diagonal that is missing the 2" nosepiece. I do however have an extra SCT nosepiece that has matching threads. To create a 2" nosepiece that I can use with my refractor, I plan to do the following:

• Start with SCT Nosepiece ( #1 ) in photo
• Insert this into a 2" OD attachment from a microscope ( #2 )
  • Slice off the top of #2 to remove the threaded top, so this can fully sheath #1
  • There is a small gap between OD of #1 and ID of #2
    • Gap is approx 4 paper widths thick. I wrapped 4 strips of paper around #1, which provides a very tight fit inside #2
  • I need to bridge this gap with some material
• Bond these two piece together, along with any material I used to fill the gap space between them

Things that have come to mind:

• Solder them with a torch ( both are aluminum I believe )  Solder would fill in the gap in this case
• Epoxy glue them, having epoxy fill in the gap
• Use a thin sheet of rubber ( or other material ) and use superglue

Writing this all out, I think super glue and .25mm sheet of rubber or plastic is the way to go. Open to any suggestions or alternatives.

 

oh, #3 in the photo is brass tubing I took from a set of 2" DIY eyepieces. I was going to use this before I came across the microscope attachment.

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[cloudsabove]

Well that turned out well. I have been wanting to use some strips of EVA glue I have lying around. It is from a type used in solar panels and was nearly the correct thickness to pad between the two tubes. Once I fitted in the gluestrips, I placed the nosepiece on aluminum, and placed in the oven. I allowed it to heat up with the oven, hopefully to minimize stress on the aluminum as it heats. At around 300F the glue started to get very soft, and at 350 appeared to be melted. I expected it to be a bit more fluid, so raised temp to 370, but it didn't seem to make a difference. Left it there for about 2 minutes tops and then let it slowly cool. It appears very firmly fixed in place.

 

Since there is a tiny lip on the original nosepiece, even if the glue releases it won't create a critical failure.

 

 

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[PIEJr]

You do realize that is Permanent marker you used, right?  

 

If you use masking tape next time, you can take the numbers off.  

 

Glad you succeeded.

I stripped the threads on my mechanical filter wheel and fixed it by Super Gluing the nipple into it.

I chalked mine up to "growing pains". It was a long time ago. But it worked.

And it is still together....