Hi,
Please show me how to add the lug on a cylindrical part as attached but I do not want to use the boss extrude feature. The reason because the programmer can't use the model. It will not allow to add material, only to remove it. Please help.
Hi,
Please show me how to add the lug on a cylindrical part as attached but I do not want to use the boss extrude feature. The reason because the programmer can't use the model. It will not allow to add material, only to remove it. Please help.
Without using the extrude feature, then it'll be more steps to get the model you posted here
Hi Christian,
Yeah, I realized that and I'm not sure how to do it. I started out with a a cylinder with the OD that included the lugs on both sides (180 degree apart). then make the 2 cuts to remove material on both sides. Now I have a ring around the cylinder but I don't know what to do next to remove the rest of the material to leave the 2 rounded lugs.
There are several ways you can model this part; however, the tricky part is how to model so it can be machinable
ok, so you mentioned programmers. I take it you work within the fabrication facility, what machinery will be involved?
Bjorn,
I'm not sure what they use to machine the part. The manufacturing facility is not here and they just informed me that they can't use the model as is. I created the lugs using the boss extrude feature previously.
I think they want to create this part by machining the shaft with a hole, then placing an appropriately sized cylinder rod into the hole. You should clarify with them there intended fabrication process so you can detail accordingly.
Bjorn Hulman wrote:
I think they want to create this part by machining the shaft with a hole, then placing an appropriately sized cylinder rod into the hole. You should clarify with them there intended fabrication process so you can detail accordingly.
Bjorn, you make a good point. I assumed total a machining and that it was all one component.
Bjorn Hulman, That is the first thing I thought of also. Trying to machine this as one part is much more complicated, costly and time consuming then a shaft with a through hole and a pin pressed into the hole.
Also, as Dan said it would need a 4 or 5 axis operation rather then a simple lathe cut and a drilled hole.
What's stock's shape you want to cut down to your model?
Christian,
This is what I have so far. Not sure what to do next. I drew a circle on that ring but how do I remove material around it?
Create a separate body that is same shape and size of the strip and add a hole to it to represent the lug.....then use that body to cut away the first body. See my reply below.
Dan,
I did exactly what you suggested and sent the model to the programmers. Hopefully, it'll work for them. Thanks for your help.
If you got to this point, then you can create a sketch a round a boss and cut to the surface - but it's not the way this part will be cut in the machine shop
see the att. file - it'd be done on a lathe machine
I think you need 2nd operation on a cnc (mill - with a custom cutting tool) to cut the slug
I bet the took maker will not be happy to grind the tool to the shape you want and am still not sure if the part looks pretty, though
Christian,
I was able to follow your example and re-created the lugs using this method (I think Dan suggested above). We'll see if that will work for the programmers. Thanks for your help.
So, you are saying that you want the create the cylinder and lug using only cutting methods instead of "creating" methods?
This partly makes sense and partly DOESN'T make sense...
It DOESN'T make sense because the programmer (I assume you mean machine programmer, like GibbsCAM and the like) shouldn't really care HOW the part is made in CAD, just that the CAD is geometrically correct. So adding an extrude, then filleting the inside corner between the lug and the cylinder to the radius of the end mill that he/she might be using should work just fine.
It makes sense if you are trying to show the machining process in your model.....
I use this method sometimes when I am trying to create "in process" configurations (when I want the part to have configurations showing each stage of machining as it goes through each operation).
First, I would ask how the programmer plans on making this part. Ultimately, if this is a machining process, then this would be a 4th axis or a 5th axis and it will have to "3d-ed" into place. So, depending on the size and length of the cylinder (and the surface requirement/surface finish, etc...) he might want to do this in 2 operations.
1st OP: turning in a lathe and leaving a strip around the part where the lug would be.
2nd OP: cutting away the strip except where the lug is in a 5th or 4th axis machine.
If this is the case, and you want to create an "in process" model, then revolve a billet......then revolve the cuts that the lathe would make, leaving the strip where the lug would be.
Then I would creating a "cutting body" that is essentially a ring that is the same size as the strip you left on the cylinder, except with a hole cutout to represent the lug. Then use the combine function to use this body to cut away the rest of the part, leaving the lug......add the fillet (or add them into the cutting body) and you are done.
Then you can create configurations to represent each operation.
Disclaimer: There may be other methods to create this type of part using machining processes (depending on what type of machines are available), but I can't think of any right now.
Create a separate body that is same shape and size of the strip and add a hole to it to represent the lug.....then use that body to cut away the first body. See my reply below.