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rubber tipping on spherical surface

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myface

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Hello everyone, I must create a rubber dowel as from photo that must be applied on a spherical surface through the insertion of the three existing pins on the patch on corresponding holes obtained on the spherical surface.

the moulder suggests, in order to favor the adherence, to "preload" the patch, diminishing its radius of curvature regarding the bending radius of the spherical surface.

Obviously once mounted, the shape of the patch must be equal to the theoretical model represented in photo.

Does anyone know?
 

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No, I can't do that. what I would try (can do tests) is derived the patch as a surface, with a factor of scale that reduces the size of what it serves; then use thickening/offset to give back the right thickness (drawing also that). perhaps to retouch the diameters of the holes?
or derive 1:1 scale and make the offset of the surfaces.. .
I'm going down there, huh?
 
ops, I now realize that I responded as if it were a technical thing of inventor while we are in the design section, I hope the answer still has usefulness. . .
 
Since the print tends to be a bit flater than the mould's footprint, it would suffice to flench the geometry you have so that, theoretically, by fitting the turkey ball a little earlier the tips.
In inventor, I don't know if there is a command that allows to do so. in solidworks exists the bending(71) solidworks - flessione-piegatura - youtube
 
shirokko said:
Since the print tends to be a bit flater than the mould's footprint, it would suffice to flench the geometry you have so that, theoretically, by fitting the turkey ball a little earlier the tips.
In inventor, I don't know if there is a command that allows to do so. in solidworks exists the bending(71) solidworks - flessione-piegatura - youtube
Click to expand...
here rightly in practice I should only flet the model, that having spherical surface results in a variation of the curvature radius, but keeping constant development... but I can't do it with inventor
 
I think it's the wrong section to post that. probably the moderator will move the discussion in the correct section.
 
biz said:
I think it's the wrong section to post that. probably the moderator will move the discussion in the correct section.
Click to expand...
and what would be the correct section?
biz said:
I think it's the wrong section to post that. probably the moderator will move the discussion in the correct section.
Click to expand...
Perhaps it would go on: mechanical cad
 
biz said:
inventor, is a problem inherent to the use of the sw.
Click to expand...
Yes, but my priority is to find someone (with other sw I believe) who can do my job or give me directions on how to do it.
then I thought that the unknowns I seek advice are not only related to how to physically make the model of the patch through the cad system used, but also to practical issues related to the world of rubber stamping.
I mean: covering a spherical surface with a dry fixed rubber tipping (not glued therefore) is not a simple bargain, any observation can be useful to correct the shooting during the project phase.
thanks to all those who want to intervene.
 
Catafratto said:
No, I can't do that. what I would try (can do tests) is derived the patch as a surface, with a factor of scale that reduces the size of what it serves; then use thickening/offset to give back the right thickness (drawing also that). perhaps to retouch the diameters of the holes?
or derive 1:1 scale and make the offset of the surfaces.. .
I'm going down there, huh?
Click to expand...
I think the patch should not be scaled, indeed the length of the arches of the three sides of the triangle and the inner surface (the concave, which goes into contact with the support surface) must remain unchanged, the only thing to vary (decreasing it of course) is the radius of spherical curvature, so that in the assembly phase the "punte" of the tocchino triangle the first spherical...
 
myface said:
Hello everyone, I must create a rubber dowel as from photo that must be applied on a spherical surface through the insertion of the three existing pins on the patch on corresponding holes obtained on the spherical surface.

the moulder suggests, in order to favor the adherence, to "preload" the patch, diminishing its radius of curvature regarding the bending radius of the spherical surface.

Obviously once mounted, the shape of the patch must be equal to the theoretical model represented in photo.

Does anyone know?
Click to expand...
:-)
I'll throw it there, hoping I get it.
But if the model is a sphere, you don't have to reduce the radius to increase the curvature?
 
maxopus said:
:-)
I'll throw it there, hoping I get it.
But if the model is a sphere, you don't have to reduce the radius to increase the curvature?
Click to expand...
It's a possibility. but it would be to reproportionate all the rest to maintain the length of the sides and the entire between the pylons.
 
but if that was the problem it would be enough to project on a floor built for three points, (referring endpoints) a normal axis on the built and passing plane to the central point of the hole/pin which lies on the neutral surface of the spherical cap. In short, keep reference points. the same thing you can do with the ends. Finally decrease the range of the ball and add the shot.
 
maxopus said:
Hey!
I'll throw it there, hoping I get it.
But if the model is a sphere, you don't have to reduce the radius to increase the curvature?
Click to expand...
(ii) if I reduce the radius I narrow the patch, if I correct its size I do not understand why I change the proportions between the sides ... I do not feel at all sure in short.
 

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