社区 › 自制DIY器材 › DIY双臂门板赤道仪

tangchop 发表于 2011-7-13 16:15

每移动弧度平均值
0.0000666844720945
每秒移动平均误差
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括号部分为负


每分钟移动弧度
0.0040000028022274
0.0040000190690438
0.0040000513365946
0.0040000996060417
0.0040001638791228
0.0040002441581523
0.0040003404460210
0.0040004527461967
0.0040005810627243
0.0040007254002265
0.0040008857639040
0.0040010621595361
0.0040012545934815
0.0040014630726785
0.0040016876046460
0.0040019281974845
0.0040021848598762
0.0040024576010859
0.0040027464309633
每分钟平均移动弧度
0.0040009658310530
每分钟误差
(0.0000009630288256)
(0.0000009467620092)
(0.0000009144944584)
(0.0000008662250113)
(0.0000008019519302)
(0.0000007216729007)
(0.0000006253850320)
(0.0000005130848563)
(0.0000003847683287)
(0.0000002404308265)
(0.0000000800671490)
0.0000000963284831
0.0000002887624285
0.0000004972416255
0.0000007217735930
0.0000009623664315
0.0000012190288231
0.0000014917700329
0.0000017805999103
分钟显示积累误差小于一个像素误差

tangchop 发表于 2011-7-13 16:32

这是每分钟移动弧度点线图
明显有加速趋势，那么第20分钟累积误差是多少呢
取积分显示
第20分钟大约误差在3-4个像素之间。

tangchop 发表于 2011-7-13 16:35

不知道我的整个计算过程是否在正确，欢迎讨论
如果缺失如计算显示
我打算做一个1kg以内的等腰三角形剪刀脚，能够负重5kg，装配精度要强于双臂结构
20分钟曝光时间也符合单反数码的实际情况，性价比比较高

guwenjie 发表于 2011-7-13 16:39

好东西的说。。。。。

tangchop 发表于 2011-7-14 00:30

经过一个晚上推算，剪刀角tt32020分钟累计2.5角秒误差不大可能是简单等腰三角形结构
看不见的哪个电跟模块了应当隐藏了两个减开线凸轮，使得看的见的一边丝杆始终保持和角速度正切，看不见另一边通过渐开线使得两个凸轮接触点力矩于角速度正切，匀速直线运动变为匀速圆周运动。
两个滑轨估计是动凸轮的承重结构，为保证精度丝杆并不承重。
高精度凸轮不是我们业余爱好者能制作的
我还是超金属双臂结构发展

tangchop 发表于 2011-7-15 23:55

本帖最后由 tangchop 于 2011-7-16 00:00 编辑

研究两个晚上苏格兰轭结构原理总算明白了
上网本没制图软件只能手画画
丝杆和门板业余手工也能搞出很高精度
如果上车床制作效果肯定强于涡轮
因为丝杆减速比更大更连贯，理论上精度更高
关键丝杆直线运动如何变为角运动需要修正三角函数偏差
如上分析，等腰三角形结构对付135镜头15分钟左右可
以但是需要很长的臂，因为0-5度范围精度可以保证，这样一个夹角设计上需要动点脑经

弥漫星云XP 发表于 2011-7-16 00:13

期待改进版！{:1_245:}{:1_245:}

qwasxin 发表于 2011-7-18 05:28

全部看完了
   LZ真的是强人
支持你
   但是疑问出来了 我想知道LZ什么的干活 怎么感觉什么都懂~~~~
希望LZ能继续完善你的DIY支持

tangchop 发表于 2011-7-20 22:48

搞了个微动云台,100块的伟峰三角架太软了

tangchop 发表于 2011-7-20 22:56

抓紧云里的缝隙又实验了下103秒
星像约有2个像素的抖动，不知道是齿轮、电机、镙纹回差，还是系统刚性
不得而知

非非 发表于 2011-7-20 23:53

非非 发表于 2011-7-20 23:57

tangchop 发表于 2011-7-21 00:04

你给我出的滑轨主意不灵，刚度下降，我准备拆掉。螺距已经是连续的了，现在系统震动引起的误差远远大于螺纹公差。

非非 发表于 2011-7-21 00:08

非非 发表于 2011-7-21 00:14

星河king 发表于 2011-7-21 14:32

这是我在坛子里见到的最牛逼的一个了。。。。。。。看傻了。。。。。

mf_blue 发表于 2011-7-21 16:22

楼主研究的比较深入。很好呀\(^o^)/~

沙漠星空 发表于 2011-7-22 15:14

非常佩服楼主的手艺！

蓝光世界 发表于 2011-7-22 17:52

强啊，，，，，，，，，，

eyuhouyun 发表于 2011-7-23 11:56

楼主真是好手艺 我也很好奇楼主什么的干活

查看完整版本: DIY双臂门板赤道仪