| Author |
Message |
    
Sheldon Dingwall
Registered
Username: Sheldon_dingwall
Post Number: 18
Registered: 08-2006
| | Posted on Wednesday, March 28, 2007 - 12:04 am: | 
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Does anyone have an idea of the upper limit for combined weight for the gantry and y-car including spindles?
Or even how to calculate the limit? |
Gerald_D
Registered
Username: Gerald_d
Post Number: 1177
Registered: 11-2005
| | Posted on Wednesday, March 28, 2007 - 07:13 am: |
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There is no limit....
There are 3 main factors for this consideration:
1. Acceleration and decel. rates that the operator would be happy with. If you can live with a slowly accelerating gantry and a long stopping distance, then the gantry can have a high inertia or mass.
2. The increased friction on the rails caused by the heavier mass.
3. whether the motor system has the torque to overcome the inertia and friction mentioned above.
You can always accept more mass if you can boost the torque. For a given torque, you can increase mass until the system becomes too sluggish for your taste, or until the friction bogs it down altogether.
Calculating it for a given system is a waste of time. Rather just load dummy mass (bricks, whatever) onto the system and see what it copes with. |
Sheldon Dingwall
Registered
Username: Sheldon_dingwall
Post Number: 19
Registered: 08-2006
| | Posted on Wednesday, March 28, 2007 - 03:34 pm: |
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"Calculating it for a given system is a waste of time. Rather just load dummy mass (bricks, whatever) onto the system and see what it copes with."
I was thinking that might be the best way to go.
Thanks Gerald. |
20. Gantry