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  • Users: Dan68c
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  1. Dan68c

    Crane and the like unwind resistance

    Hi all, I was thinking about cranes, any type. What brake or mechanism is used to stop the cable unwinding when a load is on the end. Is it the just the resistance and gearing of the motors or is there a physical lock. Small detail but something i cannot find any detail on. Thanks
  2. Dan68c

    Locking motor, mechanism lock.

    Hi all, Not the best title and if i should be in a different please let me know. I am wanting to make a motorized box that lowers. The system will be run by a single DC motor that is chain driven to a roller that unwinds cable to lower the box. My question is when i lift the box with the motor...
  3. Dan68c

    Temperature rise of object in the sun

    Hi, I have been trying for ages to work out the temperature rise of an object in the sun. Such as a roof of a house. What i have done so far is used the constant on 1200W/m2 delivered from the sun. From here i use the reflectivity value to reduce the amount absorbed and then the maximum...

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