Thanks for the reply. I figure thats what is. I image the resistance of the motors and the gearing would provide some sort of friction to stop it unwinding.
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
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...
In reply to ione comments. The equation you have provided looked good but at a second look it needs to include area i believe. Do i just multiply G by this .
Thanks
Hi,
Machine Elements in Mechanical Design, Robert L Mott
I used this alot covers a lot of things, I think shigley is better but i think sometimes having a simpler explanation in areas it makes it easier to understand and find more info later.
Good luck.
Thanks, maybe i have over estimated that value. However looking at this say you have 10m2 area. This equates to 9500W received. Now Watts as power is one joule/sec. So if the object is exposed for say one hour so this value is multiplied by 3600. Now this is a total energy in joules. When i...
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...
