Angled slot on a cylinder.

[CEMENTHEAD]

I could use some ideas to model this feature. Can't seem to figure this one out. 

I can unroll geometry to machine it. The programming part is done (axis sub),  But modeling it I have hit the wall.

I attached a mcam 2021 file of the problem area. 

angle slot on dia.mcam

[AMCNitro]

.

[JParis]

Sweep surfaces....cap them and turn it into a solid then use boolean remove...

You'll want to make sure the inner and outer edges extend a bit beyond the edges

[AMCNitro]

1 minute ago, JParis said:

Sweep surfaces....cap them and turn it into a solid then use boolean remove...

You'll want to make sure the inner and outer edges extend a bit beyond the edges

I tried that, didnt work.  It cuts it straight...

[JParis]

Unfortunately I can't try it here at home as I only have 2020

[DUM1]

angle slot on dia DONE.mcam

 

 

BOLEEN COMMON THEN SUBTRACT

oh that'sts not correct

[#Rekd™]

Not sure if this will help but to make the Booleen tool portion there was a video posted on the main Mastercam forum.

 

[crazy^millman]

1 hour ago, CEMENTHEAD said:

I could use some ideas to model this feature. Can't seem to figure this one out. 

I can unroll geometry to machine it. The programming part is done (axis sub),  But modeling it I have hit the wall.

I attached a mcam 2021 file of the problem area. 

angle slot on dia.mcam

Where did you get the swept shape from for the wireframe? When I make the center line between the two arcs normal to the Id and the OD I get a completely different shape. What is thhe total angle between both hole in the front view suppose to be and what is the required angle of sweep?

[DUM1]

40.7 appears

from front view still working top

 

[crazy^millman]

23 minutes ago, DUM1 said:

40.7 appears

from front view still working top

 

I projected the center lines of the holes for the front view and I got 40.7088. I can make the shape using normal lines to the ID or the OD from the center of both arcs, but the shape is not lining to them in the Mastercam so that is why I am asking the question. The lines of the slot are parallel to that center line, but not normal to the ID or OD so it makes for a very interesting geometric shape. Looks like someone drew a center line and projected it from the top view to make that wireframe. To me without know the form, fit and function hard to really know what is the intent here why i asked the question I did. A rolled shape normally follows the normal of the ID or the OD to allow for a rolling pin action. Why the roll die Chook was created to allow for this kind of machining on a 4th axis when in all reality you needed a 5 axis to machine it 100% correct. People have cheat this for year by just running a to size endmill in a slot to make it work, but with an undersized tool you need to have Y adjustments along the cut to make it work correctly for a rolling pin that needs to rest along a slot of this nature. This could not be engaging a bolt or a through pin and not be a big deal, but normally they do follow that shape. Since this not it has me scratching my head and doing the dumb thing and asking a question.

[CEMENTHEAD]

1 hour ago, crazy^millman said:

Where did you get the swept shape from for the wireframe?

projected the points onto the cylinder, unrolled at Ø2.875, Create 2 lines tangent, -- ReRoll  

The machining part is done, I was just banging my head on the model. I could have sworn I've done this before. like I said I just hit the wall on this.

[JParis]

something isn't right, either the drawing or the dimension....

The print shows it as a straight line dimension but the drawing clearly shows it as  rotated end holes of the slot...

If the slot was punched straight through , the view shouldn't show the angled walls on the ends

 

[CEMENTHEAD]

2 hours ago, #Rekd™ said:

Not sure if this will help but to make the Booleen tool portion there was a video posted on the main Mastercam forum.

 

That was my first attempt, I did a .28 square normal to the angle and sweep thru the cylinder (hoping to fillet the corners after) but it yellow box errored out. 

[CEMENTHEAD]

7 minutes ago, JParis said:

The print shows it as a straight line dimension but the drawing clearly shows it as  rotated end holes of the slot...

I have the assy dwg,  a pin on a shaft follows the slot as an indicator. I know Its a xxxxty way to dimension it. should be a section view with angles. (dwg is from 1985) 

[crazy^millman]

10 minutes ago, CEMENTHEAD said:

projected the points onto the cylinder, unrolled at Ø2.875, Create 2 lines tangent, -- ReRoll  

The machining part is done, I was just banging my head on the model. I could have sworn I've done this before. like I said I just hit the wall on this.

Well seems that Solid Sweep has gone through some changes and not working like it used to when I first started using it 20+ years ago. I would have done it exactly like you did using that print. Part passed inspection and customer is happy then life is good. I can create the solid shape using the start and end chains as shapes drawn in holes at the correct place. I rolled the geometry using splines to give me good sides to work from verse the lines. If you made the toolpath from the splines your toolpath would have been smoother that just using the lines also. 

Here is a link to my file and I got something that looks okay, but still wonky in my opinion. 

Link

 

[DUM1]

thanks for the lesson crazy millman

[DUM1]

On 5/28/2021 at 11:39 AM, crazy^millman said:

On 5/28/2021 at 10:18 AM, CEMENTHEAD said:

projected the points onto the cylinder, unrolled at Ø2.875, Create 2 lines tangent, -- ReRoll  

The machining part is done, I was just banging my head on the model. I could have sworn I've done this before. like I said I just hit the wall on this.

Well seems that Solid Sweep has gone through some changes and not working like it used to when I first started using it 20+ years ago. I would have done it exactly like you did using that print. Part passed inspection and customer is happy then life is good. I can create the solid shape using the start and end chains as shapes drawn in holes at the correct place. I rolled the geometry using splines to give me good sides to work from verse the lines. If you made the toolpath from the splines your toolpath would have been smoother that just using the lines also. 

Here is a link to my file and I got something that looks okay, but still wonky in my opinion. 

Link

 

here's another slot slit I cant get my head around , I am not a lathe guy but when they ask me for help I can usually fake my way through .. I have been messing with this for hours , cant seem to get the combo for the rotary dia to the chain to cut on angel , any help would be appreciated as usual 

839-A64364-001_A lathee test share copy.mcam

[crazy^millman]

2 hours ago, DUM1 said:

here's another slot slit I cant get my head around , I am not a lathe guy but when they ask me for help I can usually fake my way through .. I have been messing with this for hours , cant seem to get the combo for the rotary dia to the chain to cut on angel , any help would be appreciated as usual 

839-A64364-001_A lathee test share copy.mcam

You cannot cut that with a C axis. You need a Y axis to cut that shape. You can surface machine that with a Lollipop tool, but with a flat endmill only using the C axis not going to happen unless you get a to perfect size endmill and center cut it what you can, but the ends you cannot do it without the Y axis.

[crazy^millman]

Your machine has a Y axis according the LMD so you need to get away from trying to use C axis toolpath and use Swarf to cut this in a 4 Axis output and should be good to go. That is not going to be perfect, but it might be what you need with Swarf. Here is the File with a Morph using the Lollipop and a Swarf in a 4 Axis to cut it.

Sorry I did it in 2021.

You could also try to unroll the shape and then use Axis Sub using Y axis instead of C Axis.

Link to File

 

 

[DUM1]

1 hour ago, crazy^millman said:

You could also try to unroll the shape and then use Axis Sub using Y axis instead of C Axis.

that's pretty close thanks for the tip