We can't use "Fillet" because we don't know the radius.

Doing it in NX I also get Ø3.0176

Method above gives Ø3.0176 Did you have to specify a radius?

i used the fillet option and it works. (level 10) its identical to yours. if im miss understanding, i apologize. Create_Arc_Sample.mcam

We did this in CATIA and got Ø3.0177 In SW I got Ø3.0176 In Mastercam I got 3 different results, none of which agreed with CATIA/SW I'm going to refer this Mastercam QC

Yes... I have the same situation! In mastercam....Jake L's way is the correct result

This is ridiculous. Solidworks gave me Ø3.0176 Doing it Bird's way in MC2024 I've done it 3 times and got 3 different answers In SolidWork Start a sketch, sketch a circle in space constrain it to the horizontal line with a tangent constraint constrain it to the point with a coincident constraint constrain it to the angled line with a tangent constraint I'm going to ask our Catia designer to solve this in Catia and see what he gets.

I'm attaching an old tips and tricks page that used to be on CNC software's website. Might still be but when I search I can't find it. The first section, structure, is the most important and helpful part. ActiveReports Tips-Tricks.docx

Thank you sir. That is what I got using the method in the video I posted above. Good to know that method works. Just curious, was it simple to do in Solidworks? 4 clicks?

There is such an option....but the results from mastercam are incorrect?! I don't know why?....but it's wrong

Here you go This is a zipped Mastecam file the radius in 3.0176/2 solved Create_Arc_Sample.zip

Restore initial settings...

I have deleted all the config files before, but not the entire folder. What is the reasoning behind deleting the entire folder?

Dang I thought that was gonna work. Looks like for some reason MC decides the tangent point should be a little ways up the angled line. It's a little scary how close to correct it is, but also kind of way off

Hello I am assuming you are using a right amgle head?

I got 3 point to work, toggling "Tangent" on and off as I selected the three entities, but I was not confident the result was good. Certainly not confident enough to use the resulting arc in an program

Appreciate the effort! If we assume there isn't a magic easy button to do this, is there an easier way to do it than what I showed in the video above? Here you go Dropbox Link to Sample File Thanks for the reply! This is the closest "easy" solution I came up with as well. I figured I was missing something, seems like there should be a "create arc - tangent to two lines and one tangent point"

If you do not use a second point or specify radius, there will be no solution. I just tried two entities and you can adjust the radius size until you get really close to the vertical line. It would only be an approximation but short of getting out the old trig book it will work. Start small and work it up.

post a file I'll run it through SolidWorks

Thanks for the reply! I could do that but I still want the arc to be tangent to the angled line at the point where it intersects the small vertical line. When I originally ran into this challenge I needed the radius of the arc I'm trying to get. It wasn't so much about making something close, I was looking for the actual number

I sketched something similar to your screen shot and tried this. I couldn't come up with a satisfactory solution. This problem is 15 seconds work in a parametric modeling software like SolidWorks.

What if you extend the upper, angled line beyond the intersection point, so it's tangent, rather than an endpoint? I'm not on MC at the moment to try it, but it seems like it might like that better.

Here's a video showing another workaround to get the arc I want. Dropbox - Create Arc Workaround Example

I think you end up with the same issue of not having the ability to specify you want the arc tangent thru the endpoint of the angled line. Unless there's something I'm missing? Maybe I'm asking for too much all at once?

Will making a fillet work?