- #71
tyroman
- 139
- 0
nvn,
That is a great animation! How did you make it? Can you give me the name of the software or a link?
If he can live with your design, it would be MUCH better than the rack and pinion system I devised. It is much simpler and could be easily motorized by making the B-C link a rack and connecting his gear motor through a right angle drive to a pinion meshed with the rack.
cybertron,
I'm confused... My understanding of the Structure Limits which you had shown in your sketch at post #53 are shown in PINK on the sketch attached below. Please edit this sketch to correct any errors I have made. Also, please confirm that the doors weigh 10 pounds each, for a total of 20 pounds.
Your latest sketch appears to allow the mechanism to be up to 3" high, is this true?
Now, for the question of how much force the motor and mechanism will need to deliver:
Look again at the sketch I attached to post #59. The force necessary to start opening one of the doors with the mechanism is represented by the arrow labled "total force on linkage". You will see that it is much longer than the line representing ~41 pounds. I have not calculated that force (it will depend on the final configuration of the mechanism and the size of the angle "theta" shown on the sketch), but I would expect it to be in the range of 100 pounds.
Since the motor will be moving BOTH doors at the same time, it will need to deliver twice the force; or about 200 pounds. Any spring or counterbalance system should be set up to make the effective weight of the doors as small as possible.
That is a great animation! How did you make it? Can you give me the name of the software or a link?
If he can live with your design, it would be MUCH better than the rack and pinion system I devised. It is much simpler and could be easily motorized by making the B-C link a rack and connecting his gear motor through a right angle drive to a pinion meshed with the rack.
cybertron,
I'm confused... My understanding of the Structure Limits which you had shown in your sketch at post #53 are shown in PINK on the sketch attached below. Please edit this sketch to correct any errors I have made. Also, please confirm that the doors weigh 10 pounds each, for a total of 20 pounds.
Your latest sketch appears to allow the mechanism to be up to 3" high, is this true?
Now, for the question of how much force the motor and mechanism will need to deliver:
Look again at the sketch I attached to post #59. The force necessary to start opening one of the doors with the mechanism is represented by the arrow labled "total force on linkage". You will see that it is much longer than the line representing ~41 pounds. I have not calculated that force (it will depend on the final configuration of the mechanism and the size of the angle "theta" shown on the sketch), but I would expect it to be in the range of 100 pounds.
Since the motor will be moving BOTH doors at the same time, it will need to deliver twice the force; or about 200 pounds. Any spring or counterbalance system should be set up to make the effective weight of the doors as small as possible.