艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
Youblob (generated from this blueprint's notebook) · CC0
The Cam Timer: A Program Cut Into Discs
Before microcontrollers, a washing machine, a dishwasher, a traffic light or an industrial process followed its sequence by turning a shaft of cam discs past a row of switches. A slow synchronous motor turns the stack once per program; each disc switches one function on while its raised arc passes; the dial on the front is simply the end of the shaft, and turning it by hand skips the program forward.
Everything about the program lives in the geometry: time is angle, and each function is an arc.
This rung turns a washing program into cam arcs, draws the cams, and builds a four-cam timer from printed discs and microswitches that switches four lamps in sequence.
初学者
About 4 hours
说明
1
1
From program to cam arcs
From program to cam arcs
正在加载 Jupyter 笔记本…
2
2
One turn of the cam shaft
One turn of the cam shaft
Blockly 工作区
Loading Blockly workspace...
3
3
How a cam moves its follower
How a cam moves its follower
Each disc of a cam timer is a plate cam lifting a switch lever. The embedded blueprint shows how the cam's profile sets the follower's motion.
4
4
Build a four-cam timer
Build a four-cam timer
From the notebook's arcs, draw four discs 50 mm across with raised arcs 3 mm high where each function is on. Print them in PETG with a flat on their bore and stack them on an 8 mm steel shaft, with the zero marks lined up.
Turn the shaft with a slow geared DC motor — for a quick demonstration, one turn every minute or two instead of a real program's hour. Mount four lever microswitches on a plywood rail so each lever rides on one disc, and wire each through an LED and resistor from the supply.
Run it: the LEDs play the program in order. Turn the shaft by hand to jump to any step, as the dial of a washing machine does. Change one disc and the program changes.
此步骤所需材料：
钢棒料1 个
直流减速电机1 个
微动开关（杠杆式）4 个
5 毫米 LED4 个
330 欧姆电阻4 个
胶合板1 个
跳线1 个
凸轮定时器1 个所需工具：
FDM 3D 打印机
PETG线材
直流电源
充电式电钻
电烙铁
6 英寸数显卡尺5
5
A cam timer stuck on one step
A cam timer stuck on one step
Program timer faults.
Flow
Loading...
6
6
Context and honest limits
Context and honest limits
Motor-driven cam timers ran washing machines, dishwashers, traffic signals and process plants for most of the twentieth century, until microcontrollers replaced them from the 1980s onward — keeping the same sequences.
**Honest limits.** A pure cam timer knows only time: a real washing machine timer also waits for the tub to fill or drain before it moves on, using the level switch to stop the timer motor. The printed demonstration runs fast; a real timer makes one turn per program.
材料
8- 1 个占位符
- 占位符
- 4 个占位符
- 占位符
- 4 个占位符
- 1 个占位符
- 占位符
- 1 个占位符
此蓝图制作
相关蓝图
这些蓝图共享知识——技术、材料或原理
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。