Thread: Gantry design and FEA analysis
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23-04-2020 #1
Hi all,
So a thread of mine asking about advice on different X axis rail configurations (http://www.mycncuk.com/threads/13497...arings-designs) kind of deviated into a discussion about the suitability of the material chosen which is 50x50x3mm mild box steel, I didn't mind as all advice is welcome, but I wanted to see some data to backup what I was being told, which is the main point of this thread so I did some FEA analysis:
Goal for the machine
mill 6082T6 Aluminium at 1 to 3mm DOC with an accuracy of between 0.1 to 0.3mm
Dimensions:
600x350mm not a huge gantry by any means
Fixed Ganry Designs- 50x50x3mm mild box steel
A: No bracing used more as a baseline for comparison against other designs
B: Vertical bracing
C: Diagonal bracing
All FEA analysis' uses 980 Newtons force = 100kg
FEA Analysis Type 1, no Z axis plate
Design A: Max displacement of 0.01 mm under a force of 100Kg
Design B: Max displacement of 0.009 mm under a force of 100Kg
Design C: Max displacement of 0.009 mm under a force of 100Kg
FEA Analysis Type 2, with Z axis plate (200x300x20mm Cast Tool Plate Aluminium)
Design A: Max displacement of 0.09 mm under a force of 100Kg
Design B: Max displacement of 0.07 mm under a force of 100Kg
Design C: Max displacement of 0.08 mm under a force of 100Kg
Questions
1.Which is a more realistic FEA setup, Type 1 or Type 2 or something different (and why) ?
2. Is 100kg force a good ballpark figure to use given the cutting parameters of my machine ? This number was a pure guestimate on my part, what is the correct way to calculate?
3.The displacement figures seem to suggest the material (50x50x3) is suited to the task- 0.09 to 0.07mm displacement under 100kg seems perfectly acceptable to me unless I've missed something ?
4. What else have I missed ?
All help appreciated
EDIT:
Voicecoil pointed out incorrect decimal places in second set of results, thank you!Last edited by eci22; 23-04-2020 at 10:25 PM.
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