How to make a plywood tube
Posted 08 April 2013 - 08:17 PM
Posted 08 April 2013 - 09:03 PM
Posted 08 April 2013 - 09:20 PM
Posted 08 April 2013 - 10:33 PM
If on the other hand, you just want a durable tube that is easy to make, concrete form tube will work. Just remove the wax on the outside, and the liner on the inside, and seal it inside and out with oil based flat black paint on the inside, paint of the color of your choice on the outside. That could be white, glossy black, red, blue, or anything that strikes your fancy. You could even put wood verneer on the outside, then stain and varnish it. Again, reinforce the ends with end rings.
Posted 08 April 2013 - 11:52 PM
Posted 09 April 2013 - 12:06 AM
My 8" f/9 OTA build
Here's where I left off:
It's pretty straight and round, too! I was about to build plywood rings to support the lazy suzan rotating rings and plan a sled focuser for it when we had to move out of our house and garages for a movie shoot in the house. That's done now, so I should get back to work!
Posted 09 April 2013 - 10:02 AM
Posted 09 April 2013 - 10:42 AM
Plan B; using a form like for wooden boat building, build each half then glue them together. This has the advantage of being lighter but the work factor is very high. So is the risk. Kinda depends on your wood working skills.
At 13" a truss dob is not out of the question either. You are at the awkwards place where you can either way. I think the truss dob would be easier for you in the long run if you are not set on a tube.
Posted 10 April 2013 - 08:11 PM