Loved this. A couple of generations ago, the colleges and company training schools were teaching this stuff to thousands every year. Your teaching style is evocative of those days. Thanks.

I studied law at UCL Bentham House for a semester. I loved living in England. Your videos are a microcosm of all that is great about England. People with old knowledge to pass on

This goes deeper than I do as a hobby machinist but it's always great to see someone dotting the i's and crossing the t's. It explains some of the discrepancies we have even when we've thought it through. Thanks a lot Mr. Crispin!

You either get it or you don’t... why didn’t I listen at school 🏫! Well done Mr C

Kudos for manning up to an error ( which we all make). There are very specific other machining tubers who "know everything" but who can never admit to an error. Respect.

Thought I was dumb before, certain of it now. Great explanation none the less, thanks.

beautiful topic that is still relevant; thank you very much for taking the time.

I would imagine that the people working in a tool room and/or making small parts with very tight tolerances, this would be part of their daily fare. For those of us blacksmithing working to a thou or two level-we would give this a miss. Very interesting and informative-I still like to learn- even at nearly 82 yrs young. Thank you for sharing this. I often work in microns with single fibre optics with hair fine dimensions with square corners-Southern Cross Observatory-Tasmania 42 South. 👍🇬🇧🇦🇺🔭

To simplify this for you because it was painful to watch you fight with all those triangles. The formula is (90-Angle of part)÷2=X (tan(X)*Tool nose radius)- Tool nose radius= Tool nose shift So, (90-36.098)÷2=26.951 Tan(26.951)=.50845 (.50845*.4)-.4=.1966 Hope this helps. I've ran this calculation thousands of times years ago when we programmed 3D CNC toolpath with manual g-code before the days of CADCAM software.

its really cool to still see some of this. Kudos to both you and Joe. Math ( Trig, Euclidean geometry, Pythagoras, Abu'l-Wafa and Omar Khayyam... the list goes on) is what we dopy minded humans use to discribe and move about in the awesome, absolute measured universe (Cartesian coordinate system) in our case. Computers just happen to be really good at it, but we knuckle draging folk can still pull it off. Start drawing and finding solutions to triangles, use the new known sides to draw and solve more until you get where you want to go. BTW, I love your attention to detail in your hand drawn diagrams, I deal with lots of people who can not draw with out a computer to save their life. Like everything else in life, Use it or loss it. great stuff!

"a game of triangles" that would make a show I'd watch. Excellent video as always. Great to have you back online!

In school i was always good in machining and mechanics, but i had too much difficulties with the maths. And still have... Thanks for this video, MrCrispin. If i need to i can always come back and watch.

what a great video - finding the triangles is the fun part - thank you!

It has been a long time since high school math, and now I'm playing catch up, thanks for sharing this as it is a very useful technique to have for hitting dimension properly.

“Soh Cah Toa” brings back mnemonic memories! We also used to say Sines of happiness come after having tankards of ale!

Well I liked it. I did have to play it a few times, pause at each triangles solution to think. And I like Mr Pre-cad-cam's formula. But the explanation was perfect, thank you Mr Crispin.

5 out of 4 people struggle with math.

outstanding work. i was back in Geometry class once more. may i suggest several different color pens if we venture down that rabbit hole again. keep up the good work and thanks for taking the time to share.

Great video sir had to watch twice to fully get it

Now days a simple way to draw this is Fusion 360, just draw the tool and draw the feature with the parallel line to the nose radius of the tool and using the dimension command it will tell you the compensation in Y.

Great stuff Mr Crispin!

Hi MrCripin. Great video explaining this. How about a shop tour of the new shop. Would be very interesting. Regards MachineNZ

You just fried my brain mr crispin

Awesome!

Sometimes I feel like I'm doing well with Maths, then I watch a machinist and realize I'm on the right path but not quite at my destination.

I'm of the skill level such that your first presentation would have been spot on for me- no brag, just fact. ☺

My head exploded near the end....🤣 (kidding) Thanks for the video.

Thanks for the video.

lovely! mindblowing!

I came across this when I was trying to confirm my math. I was planning to offset the carriage instead of cross slide, which would be R/sin(taper angle). Since the compound would be set to this angle and travel linearly, I assume it should account for the tool radius. Is there a reason to calculate it like you have done here ? My understanding is for curves and facing operations, you need to add the tool radius to Z offset, for external tapers it's radius / sin(taper angle). Perhaps I'm missing something very obvious.

Spot on. Cheers

I'm going to sleep now. See you all tomorow.

i used to do that on a cnc machine, so glad ive retired.

I watched the whole video...and I still don’t have a clue what I just watched.

How's the loco built? That's why I subscribed a long time ago.

I love a bit of trig

So for whatever the angle, it's the ((adj + OPP) - hyp)? Or does it change with different tool rads

I really wish I was a clever enough to understand that

👍

Math is always fun and a necessary evil to doing a good job. 😈

If I was smart enough to follow along with the video I wouldn't even need the video.

lost it all soon as I saw the pen & pencil come out, too technical for most of us oily rags lol

For the curiosity of most of your viewer's whats your profession?

thank god for G41and G42! (or is that cheating!!)

LOL.... I thought is was odd, that in the last video, how lazy you drew the lines and marked the datum points... considering, how precise you have ALWAYS in all other videos presented your self, and drawings and explanations and just assumed you were expecting that the subscribers were to just understand the "Gist" of the topic you were explaining, of which you did exceptionally well... Will there be more fun games like this.... If not, I wouldn't want comment and to come off as me being picky or ripping apart your contents of every tiny single thing... under the assumption that there is now game to play.... BUT.... If there is a game, Heck yes, I wanna play... Sooooo, to start with... on the shadow optics... placing the radius gauge on the magnified picture... One then needs to do one more math formulas.... to divide by the power magnifier optics measure....in efforts to acquire the actual size of the radius? right?

I love a bit of trig