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| Stepper motor mechanism for animated cab topper |
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| PL1:
Printed mount brackets for the pillow bearings. Designed and test printed inner and outer 608 bearing holders. - Very snug fit. Both worked perfectly first try. 8) They will be used in a lifting arm mechanism similar to the right 2/3rds of this Roberval Balance. - The center vertical will be attached to the moving platform. (left side of a parallelogram) - The track bearing will be attached to the center of the right vertical. (right side of a parallelogram) - As the track goes up and down, the right vertical rises and falls without tilting. Scott |
| mrclean:
I see the whacky inflatable flailing arm guy for the big sale is coming along nicely! In all seriousness just seeing that thing is really getting me excited!! I'm starting to really see this come together! Sorry for the delayed response, I've got about 3-4 weeks before I'm ready to start on my end... |
| PL1:
:lol That pic is just a bearing mount and parallelogram example from Thingiverse. The actual parts look like this and are parametric so anyone can easily adjust them to suit their build. - The ghost is optional, you can import any other .stl by changing the filename and translate/rotate values in that part of the code or change the platform variables as desired to support a non-printed item. - I'll post the code after finishing the comments and making the design change mentioned below. For best part strength, print Lift_Arm_Vert on its side definitely with supports and maybe with a raft, left edge down. (rotate 90 degrees CCW along the Y axis) - Printed one as rendered and the bearing mounts are easy to break if you do something foolish like trying to remove a bearing using a screwdriver for leverage. :embarassed: Print Moving_Platform on its side with supports to avoid having to clean supports from the leadscrew holes. I need to change the back of the vertical bearing arm on the moving platform -- the tapered back makes the part lighter, but also makes it hard to install the horizontal lift arms and bearings. :banghead: :lol Here you can clearly see the two track bearings. - The left one rolls in the 24mm vertical gap shown on the test frame diagram. - The right one rolls on the ramp that controls the rise and fall of the lift arm. Looks like this setup will provide up to 3-1/2" of lift with the default settings. Still need to design microswitch holders, code some printable installation/removal tools for the bearings, select some components, and build the test frame, but things are coming along nicely. ;D Scott EDIT: Do those last two pictures remind anyone else of a Miniature Schnauzer? :duckhunt |
| jennifer:
Now that IS cool, Good job!... :applaud: |
| PL1:
--- Quote from: jennifer on September 10, 2019, 07:23:03 pm ---Now that IS cool, Good job!... :applaud: --- End quote --- Thanks, Jennifer. :cheers: Squared off the back of the vertical bearing arm on the moving platform. - It's now much easier to install the arms and bearings. Made a version of the vertical lift arm with the ramp bearing, platform, and ghost on the left instead of the right. The fully commented OpenSCAD code for these parts is almost ready. ;D Scott |
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