Another fantastic meatloaf Tom. I'm right there with ya on the books over interweb, especially now where you just get overrun with ads and completely unrelated gibberish. I use (still kinda do) to read product brochures, magazines, technical books, stuff not even in my field, just because I always found it fascinating. I also appreciate that you, and a few others, don't ever ask for handouts or support in every single video, and because of this, I will buy some shirts. Thanks for the years of education, Smiley

The Citroën car badge is a representation of Herring Bone gears as that was what the company made before cars came along.

Very cool and functional redesign of a draftsman’s lead holder. I have mine from high school drafting class in ‘75. We had to learn how to use those before we could advance to the 0.5 mm Pentel-type pencils! Still have one of those lead pointers that clamp to the edge of the drawing board. Love the old stuff.

I believe the Hultafors pencil is similar to the original Pica pencil who also make replacement lead and have Red and Yellow. The colored refills are great on dark surfaces and wood. I believe they also write well on oily surfaces.

Tom you never seem to surprise me with the tools and gadgets you come up with. and I have been watching you for years now.. Thank you for the education you have given me

3 competing frequencies is kinda cool to catch on video. Cool stuff Tom!

Caught this one 25 minutes after posting, after watching the entire video I noticed I'm one of the 2200 faithful that watched in the first hour. Thank you Tom. Happy holidays & be safe. From one of the faithful interested viewers of all things mechanical, trying to learn something new every day.

very cool stuff , thanks for the video.. and lessons ..

I asked for the watchmaking book for Christmas we will see if I have been a good boy or not. Great meatloaf Tom! ATB, Robin

Thanks for the video Tom.

George Daniels was a legendary figure in English Horology. He built incredibly complex watches from scratch. One watch recently sold for $4.5m at auction.

The pencil is called a "marker for deep holes" over here, most likely because of the long thin metal tube that allows to poke the pencil in a fairly small hole. You can get extra lead in yellow, red and grey. These are great pencils for marking on steel for cutting and welding.

When the strob tachometer stablized through the camera, it was measuring the frame rate of the camera. The only way it would stop the fan blade would be for the fan and camera frame rate to match.

That visual tachometer is the coolest thing ever 👍🏻

I have a thin rule and it is a General # 301 6" long. Nice idea. That is a nice instrument. I have a Robotak (as I recall) Strobe light that flashes at different rep rate and I used it with an angel on my shoulder to snap action wood spinning on my wood lathe as I ease a skew into the odd shaped chunk of wood. Maybe it needed an offset hole for a glass tray to sit. The fan blades are supposed to stop in the view. I also like the 'star' wheel on the back being curved for real time winding. Cool.

a perfectly well spent half hour, thanks Tom

Thanks Tom, cool interments! I made my first indicator, I inherited a watch makers lathe ,a box of tools and brass everything some books about machining from my great uncle. The lathe was a unimat 300. The book was” the interdiction to a watch makes lathe.” The book had lots of pictures so for a kid it was great and all the projects built on each other. I soon realized the drill press in the pictures was my lathe in a different configuration. Thanks for sharing.

The stroboscope tachometer was amazing. I have heard of those stroboscopic light used to measure the speed of shafts and gears but this one was very interesting. Its all mechanical and works even to this day. Thank you for sharing it with us. 👍

A, once again, wonderful episode, thank you Tom! Best, Job

Wicked! Traditionally all kind of bushmeat is put into a meatloaf - ape, boar, cebu, eagle, faun,gator,horse,imu,rat and so on depending on availability...

Thanks Tom, I waited all day for this.

Hi Tom, interesting collection of measurement gear. Love the optical tachometer, thanks for the demonstration, very well designed and made bit of kit. Cheers, Jon

Thanks for sharing Tom and Merry Christmas!

The tacho relies on aliasing between the instrument's wheel and the target (fan). In your filming setup you have aliasing interactions between the fan speed, the instrument speed, the lighting frequency (flicker) and the camera frame rate. It's an incredibly cool instrument that's very hard to demo on film. Thanks for sharing!

Always learn something, thanks for sharing!

That mechanical tacho is amazing

I have a really nice Moore low profile rotary table so I felt compelled to order a T shirt!

This is so funny, I've LITERALLY got meat grinders and meatloaf maker adverts everywhere now

Thanks for making me aware of the Hultafors pencil! For what it's worth the Markal Pro silver streak metal marker leads work perfectly in the Hultafors pencil. The case protecting a freshly sharpened point is a definite design advantage over the Markal Pro.

As others have pointed out, the camera frame rate is interacting with the shutter. Since your frame rate is probably 30Hz (actually 29.97) the shutter will appear to freeze at whole multiples and fractions of 1798RPM. If your fan has an induction motor, it will probably be spinning at 1800RPM (a little less due to the slippage required to generate torque: maybe 1750?). So they won't freeze at the same time. If you freeze one, the other will appear to be rotating about 48RPM assuming the guesses above are correct.

I've got that George Daniels book within arm's reach. It's great!

Nice vid, Tom! I’m getting one of those pencils for my Dad for Christmas. Thanks!

Hultafors makes great stuff! You should have a look at their Talmeter, it kicks the butt of any tape measure! 🇸🇪💪🏻

Love your work! 🤙🏻👌🏻

Hi Tom, A good episode of Meatloaf, Thank you... Take care Paul,,

On the optical tach, I do believe those plates make that a rotary shutter. Fun to play with. Daniel’s book should be a bucket list book for those with inquiring minds.

George & Jack Daniels what a brotherhood.

I bought Daniel's book 25 years ago. He was an pretty amazing watchmaker.

That tachometer is really cool man. I’ve managed to accidentally do this with a video camera before. Very cool 😎

The George Daniels book is a towering achievement. It shows you all you need to know to make your own watch.

Thanks tom for the meatloaf can't wait when you start cold meatloaf sandwiches on Wednesday for lunch

Cool, a buddy of mine just showed that pencil in one of his videos.. I'll have to get one

Very interesting, thanks.

Fun to see that Swiss diemaker's square again.

Helical gears are also stronger than spur gears for a given width because helicals have a longer face length and a constant contact depth line.

I just looked on Amazon about the Hultafors. They also have the refills in regular lead and in colors that will mark on all surfaces. Cool.

George Daniels is also known for the Co-Axial Daniels escapement, and it powers several Omega watches today. The picture on the cover looks to be of this escapement.

Tom you could count the amount of times you've used your die square on a saw miller's hand.

Oddly enough, I've never see a die maker check an angle at our shop. The wedm does a great job of getting it right. Times change though =)

The fan is likely a split phase induction motor which ruins slightly less than sychronous speed which is why the blades are still in motion when you align with the camera running at 60 frames/ sec. You might try putting a fly cutter in the mill, adjusting the shutter, then varying the cutter speed around a multiple of 60 hz or 3600 rpm to slow how the optical tach is used. At exactly 3600 rpm, the cutter should freeze.

Hi Tom, Cool stuff in this serving of meatloaf. Pass the ketchup please! For those of you reading this and are intrigued by George Daniels, he is interesting story and if one loves history of mechanical stuff I recommend digging into the subject further. On You Tube there are a series of interviews with George telling his story. Roger Smith who was a student of Mr Daniels and was the inheritor of his studio has an excellent lecture on George Daniels. Roger also has a interesting You Tube, rmsmithwatches and some of the what I reference above is there. I am not a watch maker or particularly interested in it, However I am a machinist so therefore I am interested on the process and history of making things. I stumbled across Roger and by extension George several years ago while looking at You Tube. My guess nearly everyone watching this episode knows about Justin, Max and quite often Stefan and the Home Shop Machinists podcast. But if you have not heard of them it is good stuff for sure, very entertaining. Cheers all.

Here's a wonderful extended interview with George Daniels. It's broken up into lots of small sections, but it's well worth watching. kzfaq.info/sun/PLVV0r6CmEsFzkr4WCsqrhvkOpA-pLIGmS And here's some more films featuring him: kzfaq.info/sun/PLB9WSi5JwX_tx5R_jvK5Qp49umEM_qToe

That optical tach reminds me of the mechanical shutter timer on an old camera I have

That pencil would be awesome with a soap stone in place of the lead, thanks Tom. I think I need a Moore t shirt. Love me some meat loaf

Hey Tom! Its Hultafors, a Swedish manufacturer. They make several versions of that pen. Its a great one if one a builder.

Even the container for the Hultafors refills for the pencil is well thought out with a clip and only releases one lead at a time. Plus have red, green, yellow, blue and white coloured leads.

I have a very similar burly mechanical pencil made by Markal that might use the same size lead. Markal also makes other colors, like lumber crayon colors, as well as their trademark heat-resistant Silver Streak leads for marking steel. Has a built in sharpener too. Worth a look.

Tom, firstly thank you for another meatloaf! Years ago I worked on an old rotogravure press that used herringbone gears that were around 20" in diameter (from recollection). I remember being very impressed by them and not being able to figure out how the heck they made them. I asked an old timer who worked there and asked what they were (the machine used open gears, not the enclosed gearboxes of most the presses I worked on) and was told what they were called and that they were used to reduce backlash under running conditions. Not sure if that backlash thing is real and wonder if you have insight into that? FWIW, I *think* the Press was an English, Baker Perkins.

Very entertaining and educational. Too bad the shirts sold out early! Take care.

sometimes i imagine making a precision device... to measure / test the calibration on these finer / precision wera torque wrenches. but these tools seem so well made, i cannot imagine them going bad anytime soon. other people seem to buy luggage scales, and use a lever force multiplier

Just when I was starting to get hungry!

Wow, another viewer in South Williamsport! Totally cool!

Mechanical strobascope Cheers Tom .

As an aside, I love shop aprons. But it seems, of late, shop aprons are only worn just for the middle chest pockets to carry scribes, rules, pens, pencils etc. because bibs with the same features would just be weird.

I thought I clicked on rapping for Jesus at first. Always good to see a vid tom.

I purchased Daniel's "Watchmaking" book some years ago when it was first published. I read it cover to cover then; today, it is still worth opening at random to find something useful, interesting, or clever.

Can u believe that i was considering getting the book as a Christmas present for myself? :D

Extra Special Brew? Every Silly Bastard? Edible Snake Butts?

I really identify with the kid playing with his dad's tools, I used to ride with my dad on jobs repairing power lines and I would always want to wear his his insulated gloves or play with the continuity tester

I have a Tac addiction and now I will forever be looking for one of them

Great "meatloaf" and perfect use of the word "chine". Stay safe!

That B&S has a lovely appearance and patina

Shop nomenclature is my favorite.. The word I always hear getting miss used......height. People always be saying “Heighth” gauge 🤣

Great video Tom. Desperately searching for the T-shirt link... :)

Always enjoy meatloaf

Odd size for a mechanical pencil lead, the common ones are 2 mm. I like the fat ones for drawing and marking, they’re 5.6 mm thick. My guess is that yours is made by Pica and branded Hultafors - they come in 2.8 mm.

I have been looking for one of those visutacs for DECADES and someone just drops one in your lap! Dang!

cool instruments those are..

I wonder if the optical tachometer belonged to Flight Engineer Schumm. Used to verify the RPM of propeller aircraft

Tasty meatloaf.👌🏻

I'm curious if you've ever mentioned what's going on when a part with flats is spun in a variable speed lathe under florescent lighting and it shows a bluish and straw colored reflection on alternate flats. I'm sure it has something to do with 60 cycle power in the lights.

I think you measured the frame rate of the camera not the fan when you were filming it. The frame was lining up with the holes in the disk hence why the disc stopped spinning. I don't think you could get all three working together unless they were multiples of each others frequency.

Please make a clock with your own flair to it, clickspring’s channel is basically dead, and it was so cool and interesting to see that. But to my understanding, he was not a machinist or a clockmaker by trade. Just bought all the tools from a clockmaker. It would be interesting to see how a traditional machinist would make a clock.

George Daniels' protege(?) Roger Smith is carrying on his tradition, and has some real craftsman skills. IF you've ever wondered about engine turning, prepare to geek out on his channel for a bit - kzfaq.info/get/bejne/g7mPepuH0pfLqYU.html

It seems to me that the apparent rotation of the window at 20:00 is the result of the interaction between window and frame rate. I don't think that the indicated speed would correspond to that of the fan. Awesome instrument, though!

A lower-tech way to measure the speed of a rotating body is to use an old timing light (you all do have one somewhere right?), and a variable frequency function generator. Loop a wire through the pickup coil on the timing light to the source and return of the function generator. Aim the light at the rotating object and adjust the frequency of the function generator until the rotation freezes. You will then know the rotational frequency of the object (or a harmonic thereof)!

Thanks Tom

I believe that you were matching the device to the camera frame rate. Correct me if I am wrong. Cheers

Ya the strobo-tach build one tom! Can you make it work under water is my only question? ha ha ya 'm starting a curio cabinet of stuff like that as soon as the ebay tach market settles down.

What a treat

The Visutac on Ebay went for $75 just about when your video was published... ;)

If the bracket holding the tachometer was made out of WOOD, could the term woodchuck apply?

The aperture is syncing (or some harmonic) to the frame rate of the video camera and not the fan..

Pause Meatloaf, open new tab, go to Amazon, buy Hultafors pencil, go back to Meatloaf. Is it just me who does this?

All the marks on the first delicious slice (the gear measurer)... the pattern on the two moving teeth, are those some sort of decorative finish, or the result of significant usage? Not clear in the video what it was, although it looked like oodles of tiny ball-peen hammer indentations.

YUM - YUM !!! PERSHING ---- EVER GET TO SHOOT ONE ??

It's funny that you said the bit about mounting it like a fighting knife because Hultafors is a knife company. Off hand I believe they're swedish.

Staedtler mechanical pencil, put that dimension, and you'll find your lead in quality and different hardness variants. I have those for my Staedtler Mars pencil.

Tom, you forgot the link in the description for the shirt.....

Did you get the value when the view was synchronised? It should be the same as (or multiple of) the framerate. That'll be a quick test to check that instrument isn't wildly out.