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!
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.
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.
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. 👍🇬🇧🇦🇺🔭
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!
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.
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.
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.
We had a far more obscene rhyme when I was at school - I can't say it on youtube, Some Old Hairy Camels Are Hairier Than Others Are. that was the gist of it anyway!
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.
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.
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.
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?
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!
Thought I was dumb before, certain of it now. Great explanation none the less, thanks.
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.
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.
Thank you very much.
"a game of triangles" that would make a show I'd watch.
Excellent video as always. Great to have you back online!
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. 👍🇬🇧🇦🇺🔭
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!
beautiful topic that is still relevant; thank you very much for taking the time.
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.
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.
You either get it or you don’t... why didn’t I listen at school 🏫! Well done Mr C
“Soh Cah Toa” brings back mnemonic memories! We also used to say Sines of happiness come after having tankards of ale!
We had a far more obscene rhyme when I was at school - I can't say it on youtube, Some Old Hairy Camels Are Hairier Than Others Are. that was the gist of it anyway!
@Nick Maclachlan At college it was . Simple over heating causes awful horrid trouble on aeroplanes.
@@framavia2201 My father taught it to me as Ollie has a hairy old a**hole, Swedes Cant Teach. It's funny how that one stuck with me. :)
Hi MrCripin. Great video explaining this. How about a shop tour of the new shop. Would be very interesting. Regards MachineNZ
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.
5 out of 4 people struggle with math.
More like 99 out of a 100 mate. 🙄
Nice one mate
So for whatever the angle, it's the ((adj + OPP) - hyp)? Or does it change with different tool rads
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.
Great video sir had to watch twice to fully get it
How's the loco built? That's why I subscribed a long time ago.
Will be starting up again on the loco in January
@Flat Bastard Engineering Channel Yes I know. looking forward to future loco episodes.
You just fried my brain mr crispin
Great stuff Mr Crispin!
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. ☺
I'm going to sleep now.
See you all tomorow.
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.
My head exploded near the end....🤣 (kidding)
Thanks for the video.
Thanks for the video.
I watched the whole video...and I still don’t have a clue what I just watched.
lovely! mindblowing!
Awesome!
i used to do that on a cnc machine, so glad ive retired.
Spot on. Cheers
I really wish I was a clever enough to understand that
Math is always fun and a necessary evil to doing a good job. 😈
The cable was just old.
He should have checked it before lifting such an Enormous radial arm drill!
It was spectacular though!!
For the curiosity of most of your viewer's whats your profession?
kaleb peart he was an apprentice engineer with Rolls Royce - aerospace rather than cars.
Yes I was an Apprentice at Rolls Royce and I now work there as a process developer on Grinding
Mr Crispin,
Perhaps you could do some grinding videos for our education. Perhaps cylindrical taper, inside and out..
Angle surface etc.
I love a bit of trig
lost it all soon as I saw the pen & pencil come out, too technical for most of us oily rags lol
If I was smart enough to follow along with the video I wouldn't even need the video.
I can do the math easy enough. But without this video, I would have thought there was an easy way and not even tried to simply calculate it.
👍
thank god for G41and G42! (or is that cheating!!)
In a non monotonic type two roughing and finishing cycle you will over cut due to the tip direction unable to change mid cycle
@@peeeoii2738 yes very true!
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?
Yes 10 times lens on that one so measure Radius on screen and divide by 10
@@MrCrispinEnterprises did I win!!!!!!! lol
But it Was obvious.
Just the factor had not been said.
I love a bit of trig