paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Hi all I thought I would post a thread on how I made my 200mm F5.475 Carbon Fibre Newt. First of all I would like to say thank you to John Carruthers for all the help he gave me with the mirror, without his help I would never of finished it. The first image just shows the mandrel with 6 coats of release agent on it. I did split the mandrel so I could remove the cardboard tube in one piece but this didn’t work very well and the cardboard tube came out in many pieces.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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In this image I have coated the mandrel in Epoxy Resin and put on the first layer of C/F and wrapped it in peel ply.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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The next day I removed the PP
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Then I put on a 3mm layer of Coremat that I fully saturated with E/P first.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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These two images show a layer of C/F going over the Coremat, if you start of nice and straight that’s how you will finish up.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
Edited by paul11 (10/11/09 11:08 AM)
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Image 2
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3454
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Looking very good! What is Peel Ply???
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Wes
Atlantic Beach, FL
Some bino’s from Miyauchi 5x32 Binon's up through Garrett 20x110 Signature's,
Some telescopes from a Stellarvue 80mm NHNG up through a couple of 8” reflectors…
And a wonderful 4.25" Delmarva Shiefspiegler!
Some good friends, made here on C/N.
Oh- several cats and a wonderful wife!
Anyone want a cat???? :-O
"When your work speaks for itself- Don't Interrupt" -Gamble Rogers
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Then I applied one more layer of C/F and three more coats of E/P to make sure the C/F was well under the surface. Then it was outside to cut the surface down until it was even and finish it with 1200 wet n dry.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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When I was happy with the look of the C/F it was back into the workshop to cut the tube to length (1200mm). I set the depth on the Router, set the fence and ran it around the tube.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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And 2
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Then I applied a single coat of Blakes 2 component high gloss clear polyurethane varnish all I have to do now is to finish it off with a burnishing cream.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Then I made the lid for the tube, I used a piece of hardboard for the base and cardboard for the walls and put on a single layer of C/F and finished it the same as the tube. To remove the cardboard and hardboard from the C/F I just put it in a bucket of water for a few hours.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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lid
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Lid on tube
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Quote:
Looking very good! What is Peel Ply???
Hi Wes the peel ply is an extremely strong material that you can pull tight over the C/F to give a very even finish. It allows any excess glue to pass through it. The only thing is it gives a matt finish so I didn’t use it on the final layer of C/F I just let it dry on it’s own.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Now for the mirror cell, for this I laminated 3 layers of Coremat and 4 layers of C/F. I made this up between 2 pieces of 6mm glass.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Then I put some weight on it and left it overnight and then made a second one.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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With a simple jig the band saw cuts perfect circles every time.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Here’s a close up of the edge of the disc.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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paul11
professor emeritus
Reged: 01/30/06
Posts: 576
Loc: Essex UK.
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Here are the 2 discs, both 10mm thick and top disc on the left has the brass threaded inserts for the adjustment bolts.
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LX90-10" Canon 350D Toucam 840K Barn-door tracker
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