Need ring castin tips
8 more posts in this thread. [Missing image file: ring.jpg]
So I'm working on casting my own ring.
<------ My first attempt
I tried to just pour cast it. As you can see, the silver ended up hardening before the mold was filled. The mold, by the way, was made by casting a wax ring I carved with a cone shaped downspru in plaster, drying it in an oven at 300* for 6 hours, and then burning the rest of the wax out on the grill for about an hour. I attached the mold and my crucible to a metal rod and heated them with blow torches for about 5 minuets until they were glowing before adding borax and silver. I kept the heat on everything until the molten silver puddle was glowing and tilted my set up to pour the liquid metal in. On reflection, I think my downfall was not adding vents, the trapped air blocking the flow of metal. I think for my next attempt I should try to build a spin caster.
Bicycle Motor Modification
3 more posts in this thread. [Missing image file: WhatTheFuckOhFuckYes.jpg]
Hello, all. I've recently decided to modify my bike to operate using a DC motor. I'm doing this for three reasons: I think it'd look totally bodacious, I need something to do, and I'm just fucking lazy.
Any ideas on where I can find cheap, yet powerful, electric motors which can propel both my bike and the added 150lbs of me? Or what about power sources? Light, compact, capable of producing, and sustaining, the required energy for the bike to function?
I have a pretty solid understanding of electrical components, their applications, hazards, and I understand most of the math. I just don't know where to find the parts.
Any help would be appreciated, or hell, why not post pics of awesome shit you've done to bikes or with electric motors.
Pic related, I imagine it'd operate much like this, though with electrical parts.
Grandfather Clock Repair
3 more posts in this thread. [Missing image file: antique-grandfather-clockantique-ro(...).jpg]
I'm not sure if this is the proper board for this, but here goes:
I have an old grandfather clock my parents purchased back in the 1970's.
Over the course of a house renovation- the clock was stored on site (in a garage) but, appears to have lost some pieces.
Any ideas as to what I can do to get this thing running again?
As a child, I remember the weekly duty of cranking the three weights up near the top of the clock body so they would continue to power the machine, but as it sits now: I only have one of these weights.
Pic related, the face is very similar to this clock- but not exact.
14 more posts in this thread. [Missing image file: 584864865187.png]
I'm trying to make sense of this circuit that tells a motor to switch directions when certain pressure buttons are pressed, but I'm having some problems understanding why certain elements are there. I've marked them for clarity.
The upper part of the network (pin 4+5) is supposed to be a system that works as follows:
It drives a motor that can switch direction of rotation by means of a relais. Pin 5 does this. If a 1 signal (3.3V) comes from pin 5, a voltage difference is created over the coil and the motor changes directions (the switch closes). If pin 5 outputs a 0 signal the 12V will let straight into the ground. Pin 4 is just there for putting the motor on and off; if it outputs a 1 signal (3.3V) the motor will rotate, if it outputs nothing it won't.
The lower part of the network (pin2+3) is meant to interpret the signals of the pressure buttons. When one of the buttons is pressed, this information should be send to the microcontroller (the pins) so that a written program can then make the motor stop rotating, switch rotational direction and start rotating again. Supposedly the microcontroller also has a quasi infinite resistance for some reason, which I'm very much confused by.
Is there anyone here who understands the functions of the marked elements or can in other ways help to interpret this circuit. Any help would be very much appreciated.