Spinning Disc: Difference between revisions
No edit summary |
|||
| Line 21: | Line 21: | ||
*mechanical revolutan step down | *mechanical revolutan step down | ||
*due to thread of bolts the mechanism had to run anti clockwise so that the nut would not loosten | *due to thread of bolts the mechanism had to run anti clockwise so that the nut would not loosten | ||
Even though the mechanism's speed was reduced signigicantly the disc still spun too fast. the result being the gauze behind the disc was sucked into it. This introduced the risk of the gauze being caught on a bit of wood and ripped. We tried to page the gauze up stage but the vacume created was too large and the disc followed. upon attempting to drop the power input we discovered that there was not enough current to keep the disc spinning. The solution was that we put two power resisters in parralell (as one became very hot) and put them on the output of the transformer. this was enough to slow the disc enough to allow it to run. the resisters however only allowed us to run the disc for a short period of time otherwise they may have burnt out. The power came from the fly floor tech earth so it was simple to un plug and stop that from happening once this disc was flown out. | |||
<gallery> | <gallery> | ||
Revision as of 21:04, 18 January 2008
The RSAMD pantomime in 2007 included a vinyl disc,4.5 meters in diameter, as a show piece. This was to spin when in and then fly out. The structure and mechanism were designed and constructed by Peter Strain
Requirements
The disk was to spin on its own accord and fly out.the mechanism would have to be on the back as there was no detail like a stylus arm to hide any mechanical parts on the front of the flat. equipment used had to me slim enough not to get caught on the gauze hanging behind it.
The Solution
The construction of the piece was looked at in two parts. a wooden and canvis frame, forming the disk, and a metal back frame to house the mechanism. the two were joined by steel plates that each have interlocking spindles. these plates were separated and bolted onto the two frames.
due to budgetary restrictions and space issues the mechanism was powered by a simple car windscreen wiper motor. This drove a bicycle gear which stepped down the motors output and spun the disk. The photos below show the component parts and how they fit together.
Technical Data
- Motor powered by mains supply to a lap top transformer
- Transformer dropped the voltage to 15V
- small gear driven my motor
- mechanical revolutan step down
- due to thread of bolts the mechanism had to run anti clockwise so that the nut would not loosten
Even though the mechanism's speed was reduced signigicantly the disc still spun too fast. the result being the gauze behind the disc was sucked into it. This introduced the risk of the gauze being caught on a bit of wood and ripped. We tried to page the gauze up stage but the vacume created was too large and the disc followed. upon attempting to drop the power input we discovered that there was not enough current to keep the disc spinning. The solution was that we put two power resisters in parralell (as one became very hot) and put them on the output of the transformer. this was enough to slow the disc enough to allow it to run. the resisters however only allowed us to run the disc for a short period of time otherwise they may have burnt out. The power came from the fly floor tech earth so it was simple to un plug and stop that from happening once this disc was flown out.
