Way beyond my capabilities, but I can see the benefits for accuracy. very informative video and great to hear a fellow Kiwi accent.

Cliff, Read Marks comment again. If you were to totally remove that passage from the context it would make the greatest gobbledygook ever! 🙂

On the issue with the loose nut on the lead screw, Gravity is ultimately helping you remove the lash from the nut I believe. Essentially you are riding on one "race" of the nut. I bet if you blued the inside of the nut and ran the screw up and down a few times you would see the blue disappears from the bottom side of the threads on the nut and the top side of the threads in the screw. As long as the screws pitch is accurate the nut will still be lifted by those threads the same amount even on a worn thread. If the device was running horizontally then you would see the issue when reversing the screw just like the lag/lash on a milling table. Just my thoughts. Totally wish my mill was a better fit for this device, but being a bench mill I fear it requires a different solution (PM833TV) Keep the video's coming, they keep me from watching all the political crude on youtube these days...

It's a great design, and we don't care about the video quality. We like engineering, not bullshit! 😅

Surely, if the pitch is correct, then the backlash will be less important.

Needs an anti-backlash nut, meaning two-piece with takeup. That said I'd be putting my energy into a closed loop servo version. Universal pitch, more compact and more versatile.

G'day Mark. An interesting build. Ok, off to part 2 now. Cheers, Aaron.

This is called R and D community R and D

Hey Cliff, referred to your channel by Mark Pressling, I live just south of him in the beautiful south east. As far as visiting Australia feel free to drop over anytime :-)

Looks like a lot of fun. Thanks for the video

Very interesting. Following you and Preston closely. Thanks

Clever stuff!

I was involved in a firm supporting an inventor or two in the eighties (a decade fraught with disaster for so called 'entrepreneurs' with inventions in the UK) & some of the stories were pitiful!

My only comment is when will i be able to get a set of plans. Any idea what the cost for a set will be?

It really is a very interesting design, I follow very closely each of the publications that you make about the design, thanks for publishing the videos. At some point a big investor will arrive because it is the solution to many problems of machining standardized precision threads. Realmente es un diseño muy interesante, sigo con mucho detenimiento cada una de las publicaciones que hace del diseño, gracias por publicarlos videos. en algún momento llegara un gran inversor por que es la solución a muchos problemas de mecanizado de roscas normalizadas de precisión

Very interested in making one.looking forward to the release of the plans

Thanks for this.

A testament to the tolerant design suggesting functional accuracy is likely attainable by most hobby machinist skill levels. 👍😎👍

Hola, buen dia ,, una verdadera maravilla,su invencion ,,,quedo atónito, ,al ver cada pieza que compone el mecanismo ,y la exacta y clara descripción de su funcionamiento ,,claro ahora esta echo, y lo vemos ,eso cambia la cuestión , y no cuesta demasiado , con la buena explicación entender , el principio ,de funcionamiento de punta a punta ,detalladamente, claro esta otra cosa, es lograr la precisión que requiere ,,me atrevo a opinar ,que aun al mas experimentado ,le costará lograr un resultado satisfactorio ,mas sin maquinaria y todo un conjunto de otras cosas ,que cuando se hace como prototipo no se tiene en cuentas, o si , pero hasta no establecer , con seguridad su funcionalidad ,, seria llamemos, inutil o poco conveniente ,,sabiendo que de una, es muy difícil dar con que buscamos ,,,esto para mi quedo demostrado wn multiples trabajos ,a traves de años ,,tambien me gusta hacer algunos inventos o reinventar ,,sería mejor decir ,,y algun detalle es inevitable , eso creo , siempre me tico personalmente pulir ,reformar ,y hasta tirar ,gran parte se lo echo ,,hasta casi abandonarlo por completo ,pero en sueños viene una nueva idea ,y hasta bo intentarlo nuevamente no me doy por vencido , ,bueno eso espero haga , espeto haga lo mismo ,, se que le sobra potencial para mucho mas ,,y una gran pena ,tirar por la borda tanto sacrificio ,,cuando ya tiene un logro asegurado ,,, y le pido disculpas ,no se otro idioma que español ,,para simplificar las cosas ,muchas grasias por el video ,, , compartir ,rida esta información que aprecio,y respeto , profundamente ,,un abrazo grande ,y buen fin de semana ,,,,

Have you considered trying a ball screw for the shaft. It would eliminate any wear cocerns and be very accurate

About your ethical dilemma There's no easy answer of course but it reminds me of Philippe Starck on the topic of industrial design. Even though he designs things as mundane as toothbrushes or lemon squeezers, he believes it important to think far beyond the 'normal' engineering considerations. He wants to not just think about the practical and aesthetics of the product, the manufacturability and profitability, he wants to think much further. Philippe thinks about the person who will use his toothbrush, the community that person lives in, the society that the community is part of, and eventually to the human species and the whole story of humanity and where we are in the thousands of years that's past and the thousands of years to come. He has a TED talk about his thoughts and I often come back to it.

This is an incredible invention. I believe you will become wealthy in one way or another. Sell the plans for $100 US. each pdf file and let the money roll in forever. Or Sell the rights with commission. There are people in this world with unimaginable wealth who would jump a the chance of investing in this. Keep the faith brother. It's only a matter of time. God bless you and yours.

I totally want to build one. Sweet ! Question, You said the leadscrew was 3.5mm pitch. Could an inch lead be used? My lathes only cut Imperial threads. Could an 8 TPI leadscrew be made to work and the ratio marks adjusted ? Thanks. --Doozer

Thank you great video

Could this be made smaller for smaller mills? Sacrifice lenght of thread? I need to look more parts about it.

I don't see why a version of this couldn't be made to fit on a lathe with the cutter in the spindle so any lathe could cut threads imperial or metric without back gears or a gear box.

Hola,, ,,bueno creo que ,lo que logro ,esta muy bien viendo todo ,el proceso desde , el principio , no creo se pueda hacer mucho mas ,en una rosca a torno con cuchilla unica ,,, y estimo desde mi perspectiva,, , suficientemente buena ,para el propósito Para lo cual la creo,,, desde ya ,,,que es algo muy dificil,,, ajustarte a las normas,,,y lograr dar con las condiciones que ella exige,,, para una rosca precisa ,,convengamos que un torno ,normal debería , en todos los casos,, tener la precisión requerida,, para que permita ejecutarla , pasando luego ,a todo lo demas ,a tener presente ,, esto es bastante critico de lograr , y seria solo ,buscar si se logra ,en ensayos ,en casos de extrema precisión tal vez ,,,donde tampoco ,,,sea conveniente se , corten ,a torno común ,o universal , ,,,,como ya lo tiene bien claro ,cualquier pequeña viruta ,juego , parasito , engranajes en mal estafo ,etc ,,puede alterar en un par de centésimas de milimetro la profundidad o los flancos ,, eso ,yo no lo veo muy facil de evitar ,,Si , Cuidados y precauciones herramientas ,de forma exactas ,, se podra lograr un trabajo ,muy bueno , y dentro de tolerancias muy estrechas , y eso es precisamente lo que hizo ,,aqui si ,existe , errores son despreciables,,, grasias por compartir ,,un saludo ,

Very interesting, thanks Cliff.

I assume you've seen the halfnut opening trick then using full reverse threading on a non native lathe?

I suspect automotive valve face finishing is meant to be a bit coarse to allow the faces to run-in together. They could be made mirror smooth, but would require much more precision for the valve guides and stems while running.

Regarding lathe screw accuracy, why assume the DRO is the source of accuracy to compare the lathe's lead screw to? Consider the screw is revealing the inaccuracy of the DRO?

Carefully designed oil retention grooves haha love it, that was the best part of the video!! 😅

Out of curiosity, did you use your wires to measure the thread after the lapping process?

Hi Cliff, I think your invention is brilliant and has its place. Here is the only question I have so far. If I understand correctly the ThreadExpress must be installed vertically on the mill to do its job. My RF30 round column mill has nowhere near that kind of vertical clearance. Could you elaborate on how this thing sits on a mill please. Tks Gilles (Canada)

14 minutes in and and I still havent seen one bit of video showing your device working. I saw a rotary table but not your device.

have you considered using a ball screw or roller screw for threadexpress? Seems you chose a regular thread intentionally so can you explain the choice vs the alternatives?

Joe Pie turns the tool upside down and threads in reverse so the tool travels away from the chuck. Would brasso work to lap the threads.

the diamond paste is not an option I once lapped a gudgeon pin to size for a piston and was very pleased with the result but although thoroughly cleaned the diamond was embedded in the pin and pretty much acted as a rasp wrecking the piston in no time. Even more work!

information: You can take car polish to. Its mostly cheap. I used often a Mequi..s cutting paste it is to prepolish fresh hand sanded clear coat. In high end body shop work the clear coat gets heavy loaded onto a car and then sanded with 800-2000grid wetsand paper down until the orangepeel from the heavy laquer work diminishes. Then that ruff surface has to get polished there this heavy cut prepolish creme comes into work. I assume it is Calciumoxid or even Calciumhydroxid used as polishing compound. It is very effective but it breaks down after 3-5 uses. I like it maybe you give it a shot. No need always for some diamond polish creme ^^

"Carefully designed oil-retention grooves." :)

I think Your videos is very interesting and infomative. I was thinking would it be possible to drill a hole in the laping nut and thred it just as an example M6. Then apply the laping compound thro that hole to the thred that should be laped. What do you think of that. From John Eriksson in Sweden

I realize you are a professional, but watching you do the lapping process wearing a leather glove makes me cringe, I saw a very experienced machinist break 3 fingers doing a similar process, thought if anything caught he could get the lathe stopped or pull his hand away before he got wrapped up…. WRONG!!!!!

Nice job sr

Your thread pitch feed verification is something I haven’t seen before. Looking back over the years, I suspect this technique would have solved some mysteries of deviations.

... "carefully designed oil grooves." I'll buy that! 😉 Good discussion on lapping as a finishing process. For a layman's treatise on thread cutting in the manual lathe, the late Martin Cleeve (pen name) wrote "Screwcutting in the Lathe", one of the Argus Books' Workshop Practice Series. He included some thoughts, based on practical experiments, on leadscrew accuracy and correction. Well worth reading.

Interesting! I have very little experience with thread lapping, but find it fascinating. I got started after seeing certain Robin Renzetti videos (he makes everything look easy 😐). I hope to gain experience, as you have done here. 👍

Silicon carbide powder/grit is readily available in nz (even in Kirikiriroa where I live) at a reasonable price as its used in lapidary. You would need to add oil to make a paste. Finer grade than 600 is often used in grinding optical surfaces in glass. I have 5 micron emery grit. Cerium oxide and rouge are used for optical polishing. Its possible to achieve an optical polish on hardened Stavax with optical abrasives..

Thank you