wrapping a flat hole pattern to a cylinder

[DC CNC]

I have a flat hole pattern(think strip of holes) that needs to be wrapped to a cylinder. I'm having to reverse engineer a part. mc2021

[#Rekd™]

Transform Tab - Roll

[Seedy steve]

you may need to rebuild the hole pattern rather than wrapping the geometry.

I don't know if there is a way to wrap a flat set of arcs.

sorry maybe some one else has a good idea.

[#Rekd™]

If it is purely arcs just find the center to center and re-create the arcs and then roll the geometry.

 

[DC CNC]

this is what I get if I roll it. I must be doing something wrong.

test.mcam

[#Rekd™]

Move your splines down to the origin (-1.725 in Z) then try it.  Before rolling them create a line end points through the middle and put a point there, that will help you create arcs later if needed.

[crazy^millman]

3 hours ago, DC CNC said:

this is what I get if I roll it. I must be doing something wrong.

test.mcam

Are you trying to come up with the angle between each of them rolled?

IMHO best way is to unroll the diameter of the arc to create the circumference. Then from there you can do the math to solve the angle for each feature.

Another way to do it is put a point in each arc and roll those points with Zero Diameter from where you are. I converted the splines for the holes to arc. I rolled it using .0001 diameter. I then used Transform rotate in 2D using the front plane at the C Plane. I aligned the axis to the point using change relative position in transform. I then put in back in rotate and moved the original arc 4 times to each of the indexing using this method. Now i have 4 arcs spaced like you had and then extruded them both ways to create the solid with the holes in there.

Here is the file with the new geometry on level 100.

5th Axis Wrap Test

[DC CNC]

Crazy^millman, thankyou that's what I needed. I was trying to get the angle between.  Learning something new everyday.

[Zaffin_D]

On 5/13/2021 at 2:39 PM, crazy^millman said:

Are you trying to come up with the angle between each of them rolled?

IMHO best way is to unroll the diameter of the arc to create the circumference. Then from there you can do the math to solve the angle for each feature.

Another way to do it is put a point in each arc and roll those points with Zero Diameter from where you are. I converted the splines for the holes to arc. I rolled it using .0001 diameter. I then used Transform rotate in 2D using the front plane at the C Plane. I aligned the axis to the point using change relative position in transform. I then put in back in rotate and moved the original arc 4 times to each of the indexing using this method. Now i have 4 arcs spaced like you had and then extruded them both ways to create the solid with the holes in there.

Here is the file with the new geometry on level 100.

5th Axis Wrap Test

 

Segment length / radius should give you the angle in radians.  The file you uploaded has 40.365 degrees between the close holes; my math lands at 39.4261degrees.

1.18699992 / 1.725 = 0.6881158956521739 radians or 39.4261366 degrees.  I used the roll function to confirm, what am I missing?

 

[crazy^millman]

1 hour ago, Zaffin_D said:

 

Segment length / radius should give you the angle in radians.  The file you uploaded has 40.365 degrees between the close holes; my math lands at 39.4261degrees.

1.18699992 / 1.725 = 0.6881158956521739 radians or 39.4261366 degrees.  I used the roll function to confirm, what am I missing?

 

No.

I said originally do the math and just threw something together to show a way. Glad someone else was willing to take a look and offer a second set of eyes to check it out for them.