Although my toolmaking apprenticeship, turned into Modelshop/R&D, that quickly turned into the DO at the age of 21. I was REALLY fortunate that my mentor agreed to take me under his wing - he told me "I don't think I can make a silk purse out of a sows ear, but I think I can make a sows ear purse out of you" But we'd hit it off early during my apprenticeship - while work experience in the DO, he gave me my 1st job which was to copy an existing print. Mylar, 5H and 2H pencils, rule ("we don't call them rulers in here as the Queen of England has F'all to do with this job") square, protractor, compass and the most important thing eraser - and away I went. The part was the base of an instrument which was square with the 4x corners turned off, and everything was about the C/L - and I thought I was doing okay when he said "that top right quadrant - tatty - have another go at it"....so the eraser got a hammering and 15 minutes later "that's good, but it shows up the bottom right quadrant - have another go at that"....so out with the eraser again and 15 minutes later rinse and repeat for the left hand side.... End of day I remember him saying "the cleaners will love you tonight - look at all that mess on the floor" But yes, printing was my downfall - CAD was a godsend. There's 2x real arts to being a drafty from a "picture drawing " perspective - neat printing, and the most important one having the initial visibility of first laying the job out in your head so you know you can then get all views and all dimensions on the sheet. As with everything now, things change and it's a lost art - but we now have the other extreme where "everyone can use a computer", so everyone thinks they can be an "engineer"!

Back in high school we had an old German welding/ drafting teacher, much like G-Code describes (drill Sargent/ taskmaster). He would make students cry. I still remember everything he taught us (well I think I remember!!!). Yes drafting with a T-Square and Vellum paper! I had an employee retire after nearly 40 years, he didn't use computers.... he would make "quick sketches" (his description) that were nothing short of works of art. Everything neatly scaled, shaded and sectioned and dimensioned immaculately.

I just did an undercut fillet with a T-slot cutter the other day. I used Flowline, with Direction and Depth Limits, and it worked perfectly.

take a look at this file ajmer_ihs_SPIRAL.mcam

You guys are great- we are working on all the above. Thank you

my drafting teacher made us memorize the factional tables from 0 to 1 by 1/64th We achieved that, then he demanded 1/128th. That knowledge really helped me in my early days as a up and coming machinist. I worked with a guy once who could do that in Mastercam V7 ( no solids) He would design and draft up B/P's for fixtures and tooling that looked like they came out of the Boeing engineering department.

You missed the bit then where he said "Listen up G, in 53 years time you'll thank me for this NOW PAY ATTENTION"

That's bit #2. Bit count moves from right to left, starting with zero. "TOS" is bit #6.

try it with a 6 MB program. Ours would stop half way thru with a 2 GB card.

Flowline and Surface Finish Contour both support undercutting. Can you share a file?

A bit of a shortcut in your method is that you can skip the "extend the two lines to their intersection point" when you create the circle. Just hit "i" key or AutoCursor > Intersection and choose the two lines, it'll snap to the intersection. ----------- You need 2 pieces of information to create a tangent arc. If you have those two pieces of information, you can calculate the missing 3rd, right? There's a critical piece of missing information to solving this, which is either the tangent point (on the bottom line) or the radius. Without specifying those two, there's an effectively infinite amount of possible answers. When you extend the bisecting angle lines, you're creating the restriction on the radius (1.50881301") so there's only one solution that fits the end point of the slanted line and the center point (Radius), which means you'll get a tangent point on the lower line at X0.57622467". Unfortunately, unless you have a specific reason for choosing the centerpoint you did (i.e., it's called out by the print to find the bisecting angle between these two features and create the radius centered off of that?) it's just really a random point in space that confirmation bias makes look more likely to be correct Note that Tom found the solution in solid works effectively the same way, using Constraints instead of the geometry.. If you use Mastercam's Arc Tangent > Arc One Point, you're now constraining two items: The end of the angled line and whatever tangent position is closest to that line. Mastercam will make an arc fitting with whatever radius you type into the panel. You can make a Arc Tangent > Arc Two Entities, which will do exactly what fillet would do, (in the background) it'll extend the angled line to the intersection and fit an arc of 1" (or whatever you specify). ----------- Basically, you're not asking the right question. For two lines of N angle, you can ask: What radius fits between these lines? Any of them, pretty much. What radius is a fillet? How many windows are in a house? If I give you a point and a line, what radius fits between those two? Any of 'em > the distance between the closest point to line. See above. If I give you a radius, where does that fit from this point to a tangent point on this line? THERE YOU GO! That's the right one ----------- I can't imagine that any CAD/CAM system can give you what you're asking for, as you're not giving complete information.

sure if you want to store multiple types in List<> the best way is to store the entity ids as long (or int for .NET ) to get the id you call GetEntityID(), then retrieve it using the Mastercam.Support.SearchManager function for retrieving the entity by id

Doing it in NX I also get Ø3.0176

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

What threadmill? You have been able to do it for a couple decades... Reduce your number of teeth...though I would suggest using multiple stepovers instead... Sample file - Bottom to Top and the same tool Top to bottom THREADMILL SAMPLE.mcam

That is just crazy I tell you. Crazy talk.

Way back in ancient times in my high school drafting class we solved hundreds of geometric problems like this, using a T-square, scale, protractor and a compass. At the time I wondered what the point was, yet 53 years later, here we are. My old drafting teacher was a strict taskmaster and would be supremely disappointed in me for forgetting the ancient ways.