Countersinks

[TERRYH]

I was wondering if there is a way to make countersinks for FHCS if I had a solid part like attached picture that I modeled in MasterCam 

[#Rekd™]

You could use a 3d toolpath to surface the slope of the countersink with a ball nose end mill. Wouldn't be as quick as countersinking though. 

[#Rekd™]

If you are wanting to model the countersinks use Solid Chamfer - Distance and Angle. 

[Radical1]

Try chamfer drilling, just have to specify incremental depth of chamfer, unfortunately because you want FHCS you will have to make operations for each different size hole.

[TERRYH]

Yeah sorry I was wanting to know how to model them not program them I know how to do that.

 

[#Rekd™]

The other option to model them is to download a flat head screw solid model from McMaster-Carr and do a Boolean remove with the screw in the proper placement.

 

[#Rekd™]

I made a video of the different methods above.

https://www.dropbox.com/s/d3z58zc9sgdub6e/Solids_Chamfer.mp4?dl=0

[Aaron Eberhard]

Good methods, #Rekd, but you missed the easiest one

 

If you're making the holes in Mastercam, use the Solid Holes function to create them as Countersink holes:

[#Rekd™]

12 minutes ago, Aaron Eberhard said:

#Rekd, but you missed the easiest one

Always learning!!!! Thank you for showing me this!!!!!

[TERRYH]

20 hours ago, Aaron Eberhard said:

Good methods, #Rekd, but you missed the easiest one

 

If you're making the holes in Mastercam, use the Solid Holes function to create them as Countersink holes:

will this work if I already have the file like the picture I showed. or would I have to start over in creating them ? I could not get the other way Rekd suggested to work gave me an error.

 

[Aaron Eberhard]

2 hours ago, TERRYH said:

will this work if I already have the file like the picture I showed. or would I have to start over in creating them ? I could not get the other way Rekd suggested to work gave me an error.

 

If you have a dumb solid as pictured, you'll have to make them into "Holes" (they're currently just extrusions).  Use Model Prep > Add History.

For example, here's something I'm playing with:

Notice how the solid body ("Fillet11" just has a Body attached).

If you use Add History to find holes:

It'll make them into solid holes that can be edited by double clicking on them in the solids tree:

 

2024 Note -  These are now under "find holes" not "add history."  Add History in 2024 will add these as an extrusion and you'll be right back where you started!

 

[cruzila]

On 5/2/2023 at 10:48 AM, #Rekd™ said:

The other option to model them is to download a flat head screw solid model from McMaster-Carr and do a Boolean remove with the screw in the proper placement.

 

How do you model the runout in the head of the screw?? :sarcasm:  seriously though, Flathead screws vary so much it tough to say what the head height really is going to be. The book sizes I have seen vary almost as much as the actual screws do.

[crazy^millman]

5 minutes ago, cruzila said:

How do you model the runout in the head of the screw?? :sarcasm:  seriously though, Flathead screws vary so much it tough to say what the head height really is going to be. The book sizes I have seen vary almost as much as the actual screws do.

Normally when in doubt I make an operation to test one hole in the program. They can tune it in for that one hole and then off to the races. I will put a Manual entry telling them to adjust the tool with plus tool length offset to work it in. If it is a loosy goosy tolerance then program to nominal and call it a day. I  have had +/-.001 diameter on Countersink diameters on parts before.