i need held in making a solidworks file.

[cloverfield333]

in the bottom part of this picture:

http://www.outdoorebooks.com/ebay/webley/im-12.jpg

how does one go about making the ramp type ratchet (on the extractor) on a 3D extruded boss in solidworks?

any help would be appreciated...

[tobyaxis]

I am not an SW user but maybe a Loft Boss or Helical Boss would work.

Just a thought.

[cloverfield333]

how do you access the helical or loft boss on solidworks 2009?

and what exactly do they do.

[Beta]

By, "Ramp", Do you mean on an angle? The question doesn't seem very clear to me...

[Beta]

Or are you trying to protrude and rotate the sprocket a given distance?

[cloverfield333]

Originally Posted by Beta By, "Ramp", Do you mean on an angle? The question doesn't seem very clear to me...

Yes i would like to "cut" those angles/ramp out of a round excluded boss like the one i have attached here.

[userx]

This doesn't look to hard but I can't understand the geometry very well. Can you upload a larger image of the sketched section of the picture? I like a solidworks challenge!

[userx]

I took a quick shot at it. I am not sureI have captured the geuometry correctly but I think it will give you a start.

I created a helix, and a sketch containing a profile to sweep along the helix. I did a cut, sweep and this is what I got. Let me know if I am way off.

[allesg]

Are you trying to put a ramp on the side of a cylinder?

If so, do an extrude boss of a rectangle the right size placed on the cylinder where you want it, then from the side of the rectangle do an extrude cut of a triangle thru the rectangle to take away the material you don't want.

[cloverfield333]

thanks for your help. I saw the final product, but i am still not completely understanding how you made the ramps.

how does the cut sweep function work?

can you explain step by step how you were able to make these cuts?

[userx]

Sure,

start by creating a helix,

go to: insert - curve - helix/spiral

Select your round face as the sketch plane and draw a circle starting in the center and co-radial with the od of the sketch plane face. Accept the sketch with the check mark.

I chose to use "Pitch and Revolution" for the defining features of the helix. I don't know what the real pitch is based on the drawing you posted so I used .5in as a guess. I saw 6 ramps on your part, I know there is 360° in a circle and a small land just after the finish of the cut feature so (360°/6 ramps) minus a little gave me a revolution of .15. and I used a start angle of 0° to ensure the helix started on one of the default datum planes (easier for me to sketch on later). Accept the helix with the check mark. You will have a small section of a helix (.15 of a revolution to be exact).

Next choose the plane that intersects the begining of the helix and cuts your cylinder in half from the model tree and place another sketch on the plane. This will be sketch5 in the model I uploaded

Draw a rectangle from the OD of you cylinder (where the helix starts) and give it a height over the cylinder of .25. give the center hub a diametric dimention of whatever you want, I used .25in.

Now choose, Insert - Cut - Sweep

choose the rectangle you sketched, then choose the short section of helix. This is going to cut/sweep the rectangular section accross the helical path. Then I just patterened it 6 tiem around the part. Good luck, is that the geometry you were looking for?

[cloverfield333]

Originally Posted by userx Sure, start by creating a helix, go to: insert - curve - helix/spiral Select your round face as the sketch plane and draw a circle starting in the center and co-radial with the od of the sketch plane face. Accept the sketch with the check mark. I chose to use "Pitch and Revolution" for the defining features of the helix. I don't know what the real pitch is based on the drawing you posted so I used .5in as a guess. I saw 6 ramps on your part, I know there is 360° in a circle and a small land just after the finish of the cut feature so (360°/6 ramps) minus a little gave me a revolution of .15. and I used a start angle of 0° to ensure the helix started on one of the default datum planes (easier for me to sketch on later). Accept the helix with the check mark. You will have a small section of a helix (.15 of a revolution to be exact). Next choose the plane that intersects the begining of the helix and cuts your cylinder in half from the model tree and place another sketch on the plane. This will be sketch5 in the model I uploaded Draw a rectangle from the OD of you cylinder (where the helix starts) and give it a height over the cylinder of .25. give the center hub a diametric dimention of whatever you want, I used .25in. Now choose, Insert - Cut - Sweep choose the rectangle you sketched, then choose the short section of helix. This is going to cut/sweep the rectangular section accross the helical path. Then I just patterened it 6 tiem around the part. Good luck, is that the geometry you were looking for?

when you say round face you mean the outer edge of the cylinder?

and the circle is sketched from the center or on the surface?

i am confused about this point.