SCREW JACK PART 2, lathe 101 Marc L'Ecuyer

Second of a series of videos on the screw jack project. These videos introduces us to certain basic turning, threading and finishing operations.Keeping in mind that the objective of my videos is to introduce novice machinists to accurate work techniques, this video presents a progressive approach to completing a complex project requiring the use of a lathe and machine shop hand tools. Marc L'Ecuyer

[@jimmilne19]

You've got the best educational materials for machining on KZbin. Love your stuff.

[@THATLAZYMACHINIST]

+Jim Milne Thanks Jim! Marc

[@GarryFullerSr]

Great 2 parts. Every thing looks so simple when a Expert does it. Thanks for showing the steps.

[@THATLAZYMACHINIST]

Hi Garry! I am working on part 3 of the project, I hope to have it complete before the week end? Gardening is slowing me down! Like the old guys use to say "KEEP ON TOP OF THE SEASONAL WORK". Thanks for watching and be safe! Marc

[@LetsRogerThat]

Holy crap, I tried making the sphere. I’ll try a third time tomorrow. You make it look easy.

[@LetsRogerThat]

Marc, thank you for making me a better machinist.

[@brianlucey4402]

Thanks for spending the time to make these videos Marc. I'm learning loads. Brian in Cork, Ireland.

[@THATLAZYMACHINIST]

+Brian Lucey thanks Brian, I hope to visit your beautiful country someday! Marc

[@brianlucey4402]

+THATLAZYMACHINIST I was in Quebec in 2011 and absolutely loved my trip. If you come to Cork give me a shout and I'll certainly buy you a pint of Guinness.

[@AmateurRedneckWorkshop]

Sort of like watching you work in my garage. My lathe is the Craftsman twin. Thanks for the excellent video.

[@MrShobar]

Dear Marc: A well thought-out approach that was beautifully executed. Many thanks.

[@pjhalchemy]

Thank You Marc! Really appreciate the sequence of operations and the logic behind them. Looking forward to the rest of this build. Much appreciated. ~PJ

[@peterbaynes5804]

A very enjoyable and educational video, as always, thanks Marc. Your logical approach backed up by clear explanations of why you are taking a particular approach are much appreciated. I look forward to the remainder of this series.

[@sdjb111]

Very nice Marc, Loads of info.

[@petek210]

Nicely explained and demonstrated. Looking forward to the next segments!

[@PeterWMeek]

Nice tutorial on hand-forming a ball.

[@cabletie8896]

Great stuff. Much appreciated. As a new boy I have much to learn. I think the first step is setting my tool hieght properly- after sharpening the tool- perhaps I should true the wheel. Critical Path Analysis means there is always something you should have done first.

[@jasonburns1407]

Great vid I'm a machinist and I now no more than I did great work

[@PhilsProjects]

Great lesson Marc. Merci

[@shadowdog500]

It was fascinating watching you manually shape that ball. Im suprised you didn't drill a hole through a piece of tool steel to make a cutter that can then be hardened. I think I learned that trick from you in a previous video. Chris

[@THATLAZYMACHINIST]

+shadowdog500 I would do that for a wooden ball but medium carbon steel is tuff stuff and would tend to chatter if too much material was removed at once. I am not saying that it wouldn't work, just that I am not brave enough to try. Thanks for watching, Marc

[@cpcoark]

Marc, a very good video. Is there any reason you didn't just use a 1/2" ball bearing? The bearing could have been annealed for machining.

[@skeeterweazel]

Thx for the lesson. Marty

[@CreaseysWorkshop]

How did you know where to put the first few bevels? Did you just eyeball them? Great video. I learn so much from your channel!

[@THATLAZYMACHINIST]

+John Creasey You'r right John, the first cuts are eyeballed. Thanks for watching, Marc

[@gilbertodiazcastro8871]

Great project. I'm currently taking the Machining course at the local Community College and we NEVER have turned a sphere, thanks for the attention to details you've explained; I'm sure I can make one now too. By the way, I'd never seen a 3-sided tool post before, was this home made? If so, do you have the plans?

[@TheDefeatest]

very nice!

[@ShuffleSk8Ter]

excellent!!

[@ianbertenshaw4350]

Thanks Marc for showing us your balls ! should i find myself missing or in need of an extra a ball now i can make one without the need of a ball turning attachment ! Ian.

[@kaiok1777]

I have also seen the forumla for cutting speed (rpm) as : sfm x 12 / dia(in inches) x pi.?

[@kaiok1777]

Did they just round 12/pi ~ 3.8, to 4 instead and done away with pi.

[@joshua43214]

almost right. sfm*12 simply converts feet to inches. You could just as easily use sfm/(dia(in feet)*pi). So what you are doing actually is rounding pi down to 3. This is an error of about 4.5%. You are calculating the maximum rpm, you would be reducing the rpm by 10%-30% anyway to compensate for tool and feed inaccuracies. You are only able to get the "perfect" mix with cnc in real life most of the time.

[@kaiok1777]

+joshua43214 Thanks

[@THATLAZYMACHINIST]

Hi Joshua! I could not have answered any better, thanks. Marc

[@oficinamaolivre]

Thank for share!!! :)

[@chrisstephens6673]

A really lazy machinist might have bought a ball.

[@marclecuyer9930]

+Chris Stephens Hi Chris! It is good to set objectives in life, mine is becoming the laziest machinist. I am not there yet, BUT A MAN CAN DREAM? YES A MAN CAN DREAM! Thanks for watching, Marc

[@chrisstephens6673]

Some would say I have been a dreamer all my life, they could be right. They say other things too, but they are far too rude for public consumption. :>)

[@joshua43214]

The laziest machinist would not bother with a ball at all and let Marc do all the work :)

[@chrisstephens6673]

but mailing costs would ruin the savings.:>(