Countersunk Surface

[Rally]

Hi all!
I'm trying to learn Mastercam and ran into a bit of a snag, I have a bolt hole that is countersunk for a 60deg. Flat Head Cap
Screw (or supposed to be). So here is my question. How do I or can I Extrude a solid Surface to where it shows the angle instead of a straight hole? Will I have to draw it different?
Thank you for any help!!

[Matt Berube]

If I am understanding correctly, there are at least 2 ways to create this using solids.

You could create an arc in the top plane at the transition between straight wall and tapered wall and "extrude cut" up with taper and "extrude cut" down with no taper.

The other way would be to make the whole profile from the side or front views and "revolve cut" it.

If you don't understand what I've typed above, perhaps you could post your file here and I can offer a better explanation.

P.S. a third way would be to use the solid chamfer function.

[cadcam]

Dang Matts all over theses posts. ;-)

[Rally]

Hi,
Thanks for the reply!
I think that I do understand what you where saing but I can't find it in the Menu. I was looking under Solid.
I did go ahead and attach the File maybe that will help.
Again Thanks for the help.

[Matt Berube]

Hiya Cadcam

Rally,

The .dwg file you sent contains only a wireframe (lines and arcs).

What CAD system is this .dwg coming from ?

Do you have a "solid" in that CAD system or do you just have lines and arcs ?

A solid can be easily created from the wireframe you supplied but if you already have the solid I'd rather start with that...

[Matt Berube]

If this wireframe is all you have, you'll have to start creating surfaces or a solid...

I don't have much to do right now so maybe I'll upload a few movies...

This one shows how to create a "ruled" surface. You would only take this route if you were looking to slap a quick surface onto the wireframe for a surfacing toolpath on the chamfer feature.

I should have something for solids shortly.

[Matt Berube]

Well, I made more movies but can't get them to upload

[Rally]

My Apology!!
Lets just start over. I am using MastercamX2, or I should say I’m trying to use it. I have uploaded the Solid Body that I have created using Solid extrude.
There is 2 things that I can’t seem to figure out!

1.The through holes should be tapered for screws stated in the original post?

2.Looking at the engraving, or at least what should be an engraving. How does one go about making it appear as a .5mm deep Engraving

If I could get them two questions answered I’m sure I could figure out a lot more.
My coworker acts like it is a company secret and will not answer any questions regarding Mastercam. Who knows maybe he is afraid to loose his job.

[Matt Berube]

Rally,

Sorry for the delay. I've been busy lately.

Apparently I must be too close to the limit of uploaded files on this website because my uploads always seem to fail.

http://www.box.net/shared/6ygprg7afu

I put a new movie on my box.net account.

This movie should answer your #1 question.


For #2, the biggest problem you'll have is that the engraving outline is not made up of closed chains. In other words you need to have a closed loop (chain) of lines, arcs and/or splines and that chain must be all on a flat plane in order to use solid extrude functions. The plane does not necessarily have to be oriented with any axis either (it could be off at any angle you like) but the entire chain must be part of a single flat plane.

Anyway, you have entities that are planar so that requirement is met but your chains are not able to be closed. You will just need to trim some entities and perhaps break or add some lines, etc. so you can form closed loops defining what you want to extrude.

Did you want the entire bar AND shield to be 5mm high ?

[Matt Berube]

I just tossed the other movies I made onto that box.net account as well.

Some of that is repeating what I've already shown but who knows... Maybe you could use the review ? I am also showing how to add the bar and shield in clip #3. Be aware, however that I was being sloppy. If this were something I was actually working on I would have taken the time to clean up some of the wireframe geometry before trying to work with it. You will see me creating lines to close your chains and you'll probably see some tiny arcs when I zoom in... I would normally get rid of those or at least make them point in the same direction... The error you see pop up has to do with Mastercam trying to make a valid closed solid. The geometry was kind of hacked up so it was confused... Once I expanded the chain using "offset contour" I was able to add the extrude boss no problem.

Hopefully this will give you a lesson about solid extruding AND a little insight on how to deal with errors when you get them.

extrude 1
extrude 2
extrude 3

[Rally]

Thanks for the replies, I sure do appreciate what you have done.
The Videos are great. I did figure out the Chamfer part I got there just a little different than what you did but outcome is the same.
About the Bar & Shield! Well I still not figured that one out. In your Video you are creating what I would call an Island, but in reality it is merely a line that was cut into the part using a 3/32" Ball endmill at a depth of 0.5mm.

But anyway, thanks again for your time.

[Matt Berube]

Rally,

Check this out...

I think it will answer your question.

Before I started recording I created an arc in the front plane and had to fillet the shield chain because Mastercam is sort of limited as a design tool and it couldn't figure out how to sweep a 3/32 diameter along the original shield contour. So I made the sweep radius smaller and the chain radii larger until Mastercam could figure it out...

Anyway, for the sake of having an example, I present another video.

SOLID SWEEP