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Custom daisy wheels #35
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Recently I disassembled my parents' old Olivetti type writer that uses a daisy wheel. @Knochi It has a small V notch to help with the characters alignment, which happens automatically when the force is applied: The MOTEX wheel does not have it, but with custom wheels it might be possible. Then, the P_press can have the counterpart. Another interesting feature is this flexible film that holds all the teeth together: Might help with the overall strength ;) |
I will see if I can apply the V-alignment feature. For the flexible film, if it’s just a sheet metal on top of the arms, that would be difficult. But in the scad file there is a parameter to define the size of the inner, solid part. That basically defines the length of the arms. |
From what I remember, Olivetti's daisywheels are made of some kind of composite plastic From the bottom it is possible to see that perhaps it is not the flection of the teeth that make up for the flexibility, but that film itself. Of course, the type writer application is a bit different, because to transfer the tape pigment to the paper, a fast "hammering" is enough. In the E-TKT's we are currently pressing to deform the tape, what creates the possibility of horizontal slipping. But, on the other hand, if we have the flection enabled by that film, we could try increasing the teeth vertical thickness! |
I have experimented printing @Knochi parametric design for the custom daisy wheels.
Keep in mind I'm just beginning at 3d printing with resin, there are among my first dozens of pieces. If anyone has experience with it, might be super useful.
Good news:
Bad news:
What I have experimented with:
I have changed a few things on the model too (e3cacbc / 27d45fe):
So, I think there might be at least two ways to tackle these issues:
1 - better suited material: I've seen people recommend mixing Siraya Tech's Blu and Tenacious to achieve a semi-flexible result.
2 - different design: to try not forcing a design that was meant for thermoplastics into resin. Maybe thickening the arms, for instance.
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