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CADCAM  
#1 Posted : Monday, August 14, 2023 9:01:49 PM(UTC)
CADCAM

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Basically I want to create knurls on solids as done here - https://youtu.be/wQaytFTckGU?t=47

How can this be done or what are the steps in Shark?

Thanks
damhave  
#2 Posted : Tuesday, August 15, 2023 6:36:50 AM(UTC)
damhave

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Denmark

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Hi CADCAM,
Example below.
kind regards
Danny


Steps to do a knurl (example in mm units):
Select Top view
Place a one point (30mm diameter, 20mm height) Cylinder at 0,0,0
Place another one point (10mm diameter, 50mm height) Cylinder at the upper center of the first cylinder (0,0,20)
Select Bottom view
Place a Center Point (2mm width, 2mm height) Polygon at 0,0,0
Move the Polygon 15mm up along the y-axis to the the upper edge of the cylinder (eg. by using the Gripper)
Rotate the Polygon 45 degree around its center (eg. by using the Gripper)
With the polygon selected do a polar duplicate (Use the Polar Duplicate Tool: number=24, no translation, center 0,0,0)
Make a 20mm long right handed helix along the cylinder axis (Helix Spline tool, Ex.Pitch 8 times cylinder hight, hight =160mm, diameter 30mm, length 20mm, draft 0) by clicking on the two centers (0,0,0 and 0,0,20 )of the first cylinder. (use wireframe view and shit+right mouse button to dynamic rotate to see the centers)
Make a 20mm long left handed helix along the cylinder axis. (click again at the two centers, but with CTRL key pressed)
Optionally Do a 0.8mm chamfer on the top and bottom cylinder edges with the Constant Chamfer Tool.
Select Bottom view
Use the CutOut Colid tool with “Along Path” selected and click on the bottom side of first cylinder, select all the 24 polygons (with SHIFT key pressed), click one of the helixes (use shit+right mouse button to dynamic rotate to see the helixes)
Select Bottom view
Use the CutOut Colid tool again with “Along Path” selected and click on the bottom side of first cylinder, select all the 24 polygons (with SHIFT key pressed), click on the other helixe.
Select Front View
Do a 1 mm chamfer on the edge of the free end of the second cylinder with the Constant Chamfer Tool.
Select Isometric View
Open the Mechanical Tool Palette
Use the Thread Tool (options External, Pitch 1.5mm, Length 48mm) and click on the second cylinders face and after that on the center of the free end aof the second cylinder.
Use the Add Solid Tool and do a union of the two cylinder parts by clicking on each of them.
Do a 0.5 mm chamfer on the inner edge between the two cylinders with the Constant Chamfer Tool.
Optionally Do a Photo Rendering (image attached with Brass selected as material, rendering time of 160s, Jewelry Design Preset, and denoiser enabled with default settings).
It may be needed to use the Display Last Image if the renderring is not shown (small SW bug)
damhave attached the following image(s):
Knurl Example image.PNG (394kb) downloaded 25 time(s).

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BR
Danny

Windows 10 Pro,
SharkCAD v14 Pro (1653),
XPS 15,9980HK
Sonoma 14.3,
SharkCAD v14 Pro (1653),
MacBook Pro 14 2023,M3
thanks 4 users thanked damhave for this useful post.
GARLIC on 8/15/2023(UTC), 24c on 8/15/2023(UTC), MPSchmied on 8/16/2023(UTC), CADCAM on 8/19/2023(UTC)
mitchb  
#3 Posted : Tuesday, August 15, 2023 10:09:08 PM(UTC)
mitchb

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I did a tutorial several years ago on this that I posted on the TurboCAD Mac forum.

It creates a sharp diamond pattern knurl but can be modified to a smoother one by reducing the number of sweeps.
File Attachment(s):
KnurlWriteup2.pdf (1,398kb) downloaded 18 time(s).

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thanks 5 users thanked mitchb for this useful post.
GARLIC on 8/16/2023(UTC), damhave on 8/16/2023(UTC), 24c on 8/16/2023(UTC), MPSchmied on 8/16/2023(UTC), CADCAM on 8/19/2023(UTC)
24c  
#4 Posted : Wednesday, August 16, 2023 10:43:05 AM(UTC)
24c

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@mitchb
that's super useful, thanks again for doing this.
I'll be using it for a 3D print surface.
Mike
macOS 14.3.1 (Sonoma) - MacBook M1 Max 64GB 2TB SSD & external display - SharkCAD Pro v14.1.0 build 1652
CADCAM  
#5 Posted : Saturday, August 19, 2023 2:08:09 AM(UTC)
CADCAM

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Originally Posted by: 24c Go to Quoted Post
@mitchb
that's super useful, thanks again for doing this.
I'll be using it for a 3D print surface.
Mike


VERY useful. Thank you mitchb. And also thank you Danny.

A knurl is generally at an angle of 30 degrees. So I know the pitch is the length / number of rotations, but I don't know how I calculate the required rotations based on an angle?

Edited by user Saturday, August 19, 2023 2:11:25 AM(UTC)  | Reason: Not specified

damhave  
#6 Posted : Sunday, August 20, 2023 11:40:57 PM(UTC)
damhave

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Denmark

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Pitch for the helix for a 30deg knurl: Diameter * PI/tan(30deg) = Diameter * 5.4414
See also:
https://www.peterverdone.com/hard-modeling/

You can verify it by making a cylinder surface, put a helix with a pitch of Diameter * 5.4414 on the surface, duplicate the helix at eg. 10deg with the polar duplicate tool, remove the face between the two helixes, convert the surface to a mesh surface, use the unfold tool and then measure the angles at the ends of the unfolded surface.
kind regards
Danny

Edited by user Monday, August 21, 2023 12:07:30 AM(UTC)  | Reason: changed 3.14.. to PI and added at method for verification

BR
Danny

Windows 10 Pro,
SharkCAD v14 Pro (1653),
XPS 15,9980HK
Sonoma 14.3,
SharkCAD v14 Pro (1653),
MacBook Pro 14 2023,M3
thanks 1 user thanked damhave for this useful post.
GARLIC on 8/21/2023(UTC)
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