creating v-belt sheave angles using Onshape

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miner49r

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Hiya Guys,
Thx go out to kvom for leading us to Onshape. This is the first Cad site/software I have been able to run on this olde confuser.

The tutorials are great and in about five hours I created a drawing depicting what will be the motor sheave for my Craftsmen badged 618. Almost.
https://cad.onshape.com/documents/5e...794d02bc94b674

Anyone have an idea as to creating the sheave grove angles and converting the radii into diameters?

Regards, Alan
 

miner49r

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I figure out the sheave groove angle. By extending the lines of the sheave faces until they converged allowed me to measure and correct the geometry. Did that make sense?

Still looking for a fix to change the radii of the profile into a diameter measurement.

Alan
 

BaronJ

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Hi Alan,

I don't know "OnShape" but most cad software has a three point circle tool. Simply pick three points on the radius and draw a circle, then use the measuring tool to give you the diameter or radius.

Hope this helps. I use "Qcad" on Linux for my drawings.
 

pkastagehand

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Hiya Guys,
Thx go out to kvom for leading us to Onshape. This is the first Cad site/software I have been able to run on this olde confuser.

The tutorials are great and in about five hours I created a drawing depicting what will be the motor sheave for my Craftsmen badged 618. Almost.
https://cad.onshape.com/documents/5e...794d02bc94b674

Anyone have an idea as to creating the sheave grove angles and converting the radii into diameters?

Regards, Alan
I guess I'm not clear on what you mean. Angles and diameter and/or radii would be locked in at sketch time with the various constraints, then the shape revolved to get 3D model. I couldn't find your drawing on Onshape to look at. Using your link just brought me to my own stuff. Clicking on public I got the whole list. Didn't know what you called your file.

Paul
 

miner49r

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Hi Paul
The sheave profile was sketched above the center line followed by using the "revolve tool" to rotate the profile around the axis creating the sheaves.

I just had a thought... I might be able to "mirror" the profile... hmmm

Alan
 

miner49r

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Had to start from scratch but the mirror tool did the trick. Draw the basic profile above the axis then mirror the profile below the axis before defining measurements. As with most everything I do, it might not have been the easiest way, but it worked for me. :p
I give permission to all who want to copy, modify, use, or mutilate as they see fit.
Regards, Alan

https://cad.onshape.com/documents/3a3e6edb16f54897b6b33dfe/w/2b0723d836d241f2a6751cd9

https://cad.onshape.com/documents/3bcff25f337c4aac8592b31f/w/0065d282a4e14d93a3b76f1a
 

Woodster

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It might only be giving radii dimensions as your drawing has a cut out/section view so there are no full circles from which the software can derive a diameter. Solidworks is the same. It needs a full circle for diameters. If even the smallest part has been cut away, it will only give you radii.
 

miner49r

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It might only be giving radii dimensions as your drawing has a cut out/section view so there are no full circles
Woodster,
You and Paul are correct that there was no full circle to draw the dimensions from. The trouble I was (and still am) having is placing the circles on the correct plain in the initial sketch. After the part went 3D there was no problem placing the circles but then those dimensions would need to be printed on a separate sheet.
I am sure being a CAD rookie has a lot to do with my problems. I'm still learning.

I didn't realize that the links won't take you directly to my drawings. They are listed under Alan West.

Regards, Alan
 

kvom

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I looked at your project. Wanted to point out that the bore could be created as part of the revolve.
 

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