[多图]３６寸［914mm口径］ＤＯＢ
本帖最后由 steveyzh 于 2011-7-23 08:20 编辑来源：http://darkskyobserving.com/72B14.GIF 老外很强悍~ 犹豫翻译不准确，文字部分贴原文，包涵~yct42.gif 按以下不同结构部分上传图片，有些设计还是有亮点主镜座主镜箱蜘蛛架及副镜，（副镜也要冷却）副镜箱轴承组装DOB主要部件跷板箱和底板DOB自动系统运往观测地组装2011年最新修改
设计图
yct61.gif看着看着啥时候掉下来都不知道。。。。。不过确实大。。。。导弹发射筒、、、、
主镜座
3" square steel tube was used as the frame of the cell. Calculations show no part flexes more than 0.0002 of an inch....
Time for some welding!
We got the tour of Vaughn's workshop and loaded the mirror crate
into the back with a half inch on each side to spare....
Stuff is getting attached to the cell....
远程控制调光轴，这个新鲜:)
The remote colimation feature puts spring tension on the belt since they can strech over time....
The larger sprocket is pinned to a 1/2-20 threaded rod which passes through a custom brass insert. The other end of the rod is attached to the cross member and secured so the cross member can only teeter-totter with the triangle supports at each end....
近照：
All the mounting holes are there with the exception of the light blocking pieces of 1/4" Masonite board....
Here all the wiring is done. in the clear bag near the center of the cell are the RH (relative humidity) sensor and the 5 thermocouples....
The control box and TC meter along with the wiring harness. The white connector at the right is the remote collimation 9 pin cable that goes to a small hand paddle with three center-off ON_OFF_ON toggles and a master ON_OFF once colimation is done. Then it just unplugs from the control box and is stored.
1/4" stainless steel cable wraps around the perimeter and there are two support stanchions at 45 degree points with 2" travel linear bearings attached. Once the mirror is put in place the cable will be placed on the center of gravity, taking into consideration the 1/2" depth of the curve on the frontside and the 19 hexagons (no shortage of math problems). The linear bearings will give near-zero friction when the mirror is tilted by collimation and keep the mirror centered....
主镜箱
The pole blocks are shown and the lines on the walls where the bulkhead plate will sit on the oak corner brackets.
One of two blowers are seen here along with the linear bearing and the 3/4-10 threaded rod with the unfinished mirror clip. Between them is an anchor bolted to the side of the box with a 3/8-16 threaded stud sticking out....
As seen here, using one of the secondary cage stanchions as a truss pole, the truss will pass through the pole block (and bulkhead plate not shown but will sit on top of the oak coner bracket) and get threaded onto the anchor stud. The block will be tightened for a two point attachment of the truss. The poles are very sturdy in this arrangement unlike a single pole block attachment....
The pole blocks are getting attached after things are leveled and a plumbline hanging down from the apex of two truss poles. The three fans are seen which will blow across the mirror to eliminate the surface heat layer....
Mirror cover in place....
蜘蛛架及副镜，（副镜也要冷却）
6" diameter 1/2" thick aluminum blanks were used to create the pivotable secondary holder with a 3/4"-10 threaded rod. It uses a 2"x2"x6" block of aluminum for the center block of the spider to which the vanes will be attached. The two fans and six vent holes allow air flow to cool the secondary mirror.