hi,
Closed...
need help for lighter weight tube making(closed)
need help for lighter weight tube making(closed)
Last edited by michael on Wed Aug 08, 2007 3:30 pm, edited 1 time in total.
If you have the captial, you can try carbon fibre.
Photo Album:
http://www.flickr.com/photos/14113965@N03/
http://www.flickr.com/photos/14113965@N03/
either aluminum or carbon fibre will flex. you need to have it rolled (for aluminum tube) or put custom-machined end rings to strengthen it. A 12" OD, 60"L CF will cost ard $1500.00 (not worth it unless you're making a premium scope).
See here for alternative: http://www.singastro.org/viewtopic.php?t=3352
See here for alternative: http://www.singastro.org/viewtopic.php?t=3352
I know a supplier in China who is making 290 mm id, 1.5 mm thickness and 1500 mm long carbon fibre tube for dobsonian telescope. Cost is roughly S$ 600~700. The correct way to make rigid CF tube is to multiple spiral bound it from a mold rather than roll and reinforce it. I am considering to make an 8 inch dobsonian using his 240 mm id CF tube in near future.
Sonoco Singapore Pte Ltd also makes kraft paper sonotubes up to 1000 mm ID however they require a minimum order of 50 meters.
http://www.astronomy.com.cn/bbs/attachm ... update=yes
Sonoco Singapore Pte Ltd also makes kraft paper sonotubes up to 1000 mm ID however they require a minimum order of 50 meters.
http://www.astronomy.com.cn/bbs/attachm ... update=yes
Last edited by denebman on Thu Aug 02, 2007 4:24 pm, edited 1 time in total.
If you read Chinese, here is the link:
http://www.astronomy.com.cn/bbs/viewthr ... 3%E5%BE%84
http://www.astronomy.com.cn/bbs/viewthr ... 3%E5%BE%84
10" Telekit with Zambuto optics~TMB 152/1200 (construction)~Takashi Mewlon 210~TMB 80/600
tube
hi
thanks for vluble dscn....i am not going fo crbn fiber. i just want to make with alluminium...i think i can get it more easily and cheaper way right?...also not so heavy weight.
Now i need to know which thickness of the wall should be btr for this kind of tube? 1mm,1.5mm or more..?
thank you...
thanks for vluble dscn....i am not going fo crbn fiber. i just want to make with alluminium...i think i can get it more easily and cheaper way right?...also not so heavy weight.
Now i need to know which thickness of the wall should be btr for this kind of tube? 1mm,1.5mm or more..?
thank you...