Commit 9393a6f2 by Ruben Castro

### aa

parent f2aee638

157 KB

112 KB

 ... ... @@ -90,7 +90,8 @@ Also... Spring on Z axis? Gettin better. #### New bearing design. With the 45 degree bearings, tightening was easy because contact was only at a point. There is no need to maintain alignment. With the full contact bearing, there is now extra bolts needed to tighten it up. This adds up to more space which is fine and attainable for the y axis carriage attachments. But I wonder if there is a neat solution for the x axis to take up less space. Maybe one is enough and let flexture and the pressure from the material makeup the difference? With the 45 degree bearings, tightening was e asy because contact was only at a point. There is no need to maintain alignment. With the full contact bearing, there is now extra bolts needed to tighten it up. This adds up to more space which is fine and attainable for the y axis carriage attachments. But I wonder if there is a neat solution for the x axis to take up less space. Maybe one is enough and let flexture and the pressure from the material makeup the difference? ##### Mounting stuff to bottom ... ...
 ... ... @@ -2,6 +2,15 @@ The RCAT 0030 is very solid when it comes to the base. The base is quite rigid in all degrees of freedom, however, it is easy to see its weak point in restrospect: the attachment from the x carraige to the bed. There is a diving board effect that happens at the edges and it could lead to major deflections. Thus the search for a more rigid structure is here. ###### Measure of static forces that machine will encounter - 400 g at 1G simple F=m*A. F = 0.4kg*9.81m/s^2 -> F= 3.92 N. This is a tiny load my friends. I have been working with 200N loads. lol. total Force = 3.92*1/0.3(efficiency) = 13.067 N - belt tension = 20 N # Side face attachments ... ... @@ -10,3 +19,24 @@ The vertical side face needs to attach to the horizontal side face at some point There is a general design for how this will work: There is a desire to make the previous way the bed works to keep being the bed. The bed is just so nice. The isogrid-type bed is surprisingly rigid and way better than a simple 1/4" sheet, which makes sense from an inertial point of view. ## basic structural loop ![cat0040_draft1_image](Notes_media/CAT0040_structural_draft1.png) Here is the basic structural base of the machine. It is interesting to note that while this version shall have a axis without intertwined actuators, it could easily be Core-XYed ![side_structure](Notes_media/CAT0040_structural_side_draft1.png) A few things to note: The boxy structure at the end. Lateral forces are transmitted through the base of the x-carriage onto the vertical side rail. Traditionally, these loads are handled poorly with bending-type loads, however, here the unsupported beam is only a short distance from the 3d printed joint up to where the bearings run through (~2cm), and after that is supported by a joint through the diagonal triangle support and into the base, and attached at a second point down at the actual junction with the bed itself. This should be rigid enough. The vertical loads are handled lower down with those loads carried through the side webs, whose inertia is maximized on that axis, leading to lower bending since all loads carried through are purely in the Z direction. There is a worry I have of the X direction forces handled from the motors into the rail. ## To-do before laser cut - check al displacement from bearing to plates are 1mm - Add kurf compensation to diagonal pieces - Add pulley situation - Finish X carriage situation with classic room for kinematic mount - Carriage let it go all the way in -
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!