|
Your other issue is the actual tube flexing between your mirror and the focuser but thats another thing all together!
if you where to put one OTA ring around near the focuser and actually screw the focuser base plate to the OTA ring it will distribute the weight over a far bigger area.
stress = Force/Area.
If you are going to use contact adhisive to attach your strengthening plate under the focuser on the inside of the OTA that will be as useless as using clag glue to hold on your bonnet of the car... Contact adhesive while it holds on like !@#! to fur is flexible/ductile.
You are trying to laminate two layers of material together. for them to work in composite actions you need to make sure there is no give between the two layers. Using bolts tightly fixed will semi allow this action to occur. bolts with a epoxy cement will take it to the next level. But once again stress = F/A but this time its the material that is able to take more stress as it has more depth and hence more leaver arm to resist the moment couple, that and the fact it is now applying the force to the OTA itself over a much larger area.
Oh if you want to get a piece of Ally to fit within the tube take it down to your local fab shop, they will have a roller in the workshop and for 10 bucks would roll it for you in about 3 minutes to suit the ota, far easier and much more professional!
Brendan
|