| Author |
Message |
    
Gerald_D
Registered
Username: Gerald_d
Post Number: 215
Registered: 11-2005
| | Posted on Sunday, August 27, 2006 - 06:44 pm: | 
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In this thread we can talk about:
- what if 100x50 box section is not available?
- can the wall thickness be thicker or thinner?
- how long must the tubes be to replace a SB gantry?
- what if they are not cut square?
- etc. Anything to do with the selection of material, size, shape of cutting the cross tubes/members. |
Kim Mortensen
Registered
Username: Inwonder
Post Number: 15
Registered: 12-2006
| | Posted on Sunday, December 10, 2006 - 01:02 am: |
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I'm about to get these cut for my Y Gantry. Is my reading the plans correct, that the beems should be 500mm longer than the max size of the workpiece I'm going to use in the machine..???
I mean, if the max board size is 1220*2440 mm the I need to make the Y-size 500 mm longer, ia. 1720mm and the X lenght is going to be 3040mm long right..?????? |
Gerald_D
Registered
Username: Gerald_d
Post Number: 622
Registered: 11-2005
| | Posted on Sunday, December 10, 2006 - 06:18 am: |
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Yes, the drawing 102044S is correct. This how the 500mm is used:..............
1. the center of the cutter must be able to move further than the edge of the board because you often use the side of a cutter to cut the edge. Allowing the center of the cutter to move 50mm past on all sides adds 100mm to the beams.
2. The wheels of the car riding on the gantry must not fall off the ends of the rails. The distance between the Y-car wheels is 381mm and so we need to add that to the 100mm above.
Total 481mm. Using 500mm then leaves less than 10mm tolerance on each end.
(for the x-rails the distance between the gantry's wheels is 475mm leaving 12.5mm tolerance each end) |
20. Gantry