| Creator: !mURx |
| Date: 1999-08-23 |
Rating:  |
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Something about the original basket
The basket was built by Walter Kleinert in 1979, he modded a wooden plank above the stairs, added a small wheel and tent cord rated for 100 kg.
A fat knot stopped the basket when it arrived downstairs.
He got this idea because he was tired of getting the newspaper from downstairs every day.
It was just a matter of time until he made the postman put the newspaper into the basket.
Like that, he was able to pull up the newspaper easily. (by hand)
When the first basket got broken in 1989 (Ø 23cm) during a spectacular crash a new basket was needed, so he got a new one (Ø 35cm).
It is still used today.
The actual project
The automatic basket project should unburden the residents of the 4th floor in the Allschwilerstr. 79 (Basel) by adding a motorto a winch which pulls up the basket automatically.
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 | The project is being prepared, the motor is being removed from its case, it gets new brushes and plans for a motor bracket and a winch are being designed.
The freshly assembled 90 W motor. It is placed to a meccano plate to test it at idling speed and to measure the rpm. It was measured with a laser pointer, photo resistor and oscilloscope, and look: 12000 RPM! This motor was originally designed for a compressor, whose case can be seen in the background. |
 | The mechanic part starts, the parts are milled and lathed in the Swisscom LW in Arlesheim.
This is a test round-up of the winch |
 | Finally! The test phase has begun.
The motor/winch combo is connected to the basket for the first time. I used my foot to keep it down on the floor! It hurt badly when the knot smashed on my foot, but I don't care, it works! The motor with a 1:1 transmission ratio pulls up the basket to the 4th floor in no-time! It needed only three seconds!!!
A success so far, but what if the basket is full of stuff? To try that I put a full 1.5l bottle of Sinalco in the basket. The descent using motor brakes (shorting the coils) worked perfectly! The basket, which was heavier by 1.5 kg, went down quickly but not too fast without needing to be stopped by hand! However, pulling it up again was too much for the motor. It needed a transmission gear!
The axes should be like Ø5-10mm. The transmission ratio should be 3:1 to 6:1 (optimal 5:1). |
 | The basket |
 | The urgently needed emergency stop button has finally arrived, sponsored by Wosniak of the Trench Boys. Now I can start the design of the control panel, unfortunately there never was a final design.
The emergency stop button and the other elements of the future control panel. The lock switch was used later in field service. The base is actually the schematic, which can be downloaded as part of the plan package. |
 | These are four switching power supplies which have been looted. These 5V/3A switching power supplies are used for the controls and magnet brakes. |
 | A picture of the magnet brakes which are hopefully able to keep the basket in position. |
 | Finally, "MORE POWAH!!!" *arr arr*, a badass 550 Watts!
The motor was donated by René Morszeck.
There is still a padsaw around the motor, which has to be removed because the basket should be pulled up and not sawed into pieces!
This is the type plate of the saw, 550 Watt / 2.5 Ampère and 3750 rpm.
This motor (six times the power of the old one) should have enough power to pull up the filled basket easily to the 4th floor. |
 | I start disassembling the saw but I run into problems at once: TORX screws!
Where should I get a torx driver from on Saturday evening??? There's only one solution: Mod one!
Take 2.5mm Inbus wrench and a Dremel with mini cutting-wheel and transform it into a TORX. |
 | The saw in one piece |
 | The TORX-MORX did its work without problems. |
 | A closeup of the circuits |
 | After a lot of modding I manage to open the case. There's a ton of grease in there! |
 | An overview of the whole thing |
 | Here was the hacksaw!
To be continued... |
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| The more Arnolds the better! |
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| Prior ratings: 5 |
