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Old 23-06-2006, 12:30 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,814
Hi Ric

I have made one from "camping mat" foam. I chose this material because:
  • Camping mat foam has a closed cell construction so will not absorb moisture
  • It is very light weight
  • It has a good resistance to tearing and crushing.
Once I had it cut to size, I used a router table to rebate the two edges where it would be joined, to half thickness on opposite edges, and then used some contact adhesive to bond the stepped edges together. I still have it 10 years later! In theory, you do not need to rout the edges, as I'm sure that contact adhesive will allow you to make a strong butt joint.

I have also used the plastic material from computer paper binders, and used contact adhesive and staples to form a nice cylinder. I taped up the staples to make sure they did not scratch the OTA.

Right now, I have an Orion 10” SCT dew shield for my C9.25, whose advantage is that it can be “un rolled” by separating the Velcro strips and can thus be transported as a flat sheet rather than a bulky cylinder.

Cheers

Dennis
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