CNC Machining vs Manual Machining - Part 1

[@sidengland6302]

When I started machining in the early 70s most of it was done manually. When NC came in, it might take days to program a part that can be done now in a few minutes with modern cad-cam. Technology always marches on, but to really understand machining, manual is still necessary.

[@landrygael8473]

i know I am kind of off topic but do anyone know of a good website to watch newly released movies online ?

[@gusulises1758]

@Landry Gael i use flixzone. You can find it by googling :)

[@claytonaxl6126]

@Gus Ulises Definitely, have been watching on Flixzone for since march myself :D

[@landrygael8473]

@Gus Ulises Thank you, I signed up and it seems like they got a lot of movies there =) I really appreciate it !!

[@gusulises1758]

@Landry Gael Glad I could help =)

[@russellbowman9302]

With only one hole on both sides of a crane arm to weld a cast slug in using a horizontal boring mill, first drill and bore out the hole for the cast slug on both sides, then weld in the slug, then bore out the slug to fit a bearing race on both sides of a 30 foot long crane arm. It takes hours just to position this 10 ton crane arm correctly and a lot of machine maneuvering is needed to clamp it down in the proper orientation using cranes, come along, jacks, shims angle plates, and clamps. CNC would be a waste of time, and it would be so cumbersome going back and forth to move the table and quill. Same goes for rebuilding machinery in place in a factory. How would you set up a CNC on a huge machine needing to have a bolt hole welded in and then drill out the hole in place when a mag base drill press would do? Have you ever had some one come in and say, hey, I need a hole drilled here, and then just put it on the mill and drill it out? By the time you took to set it all up and programmed the operation, I would all ready have the hole drilled out on a manual mill. There are applications for both in different circumstances, and to say CNC or manual machining is better than the other in all circumstances is a useless argument. Unfortunately, manual equipment manufacturers are falling by the way side as everyone flocks to CNC. That is too bad, and from experience, I can say for the most part, manual equipment is getting more worn out and less accurate since there are few real quality replacements. Your best leaders in a multi-use job shop are the ones that can do both manual and CNC work, and they know when it is best to go one way or the other to get the job done.

[@stevec8014]

This is just plain stupid. With this part there is no question cnc is the way to go. Even hand writing the code would probably be quicker. There are many legit ways that manual is sometimes a better choice than cnc but if you are really trying to prove that point why not make a video with a realistic comparison. I had my own shop with cnc and manual for over 25 yrs so I've had some experience with this sort of stuff

[@funone8716]

This is no doubt a CNC part. Looks like the cutoff saw needs a tune up or is a POS. Why is the end mill in and out of the center hole so many times? Why not rough the outside, rough the hole, finish the outside, finish the hole? Seems like a lot of wasted motion dancing around the part.

[@Moronicsmurf]

Why the second cut wasnt working in aluminium was because you were taking to shallow of a cut with a WNMG insert with the chip breaker not being hit by the swarf and the radius of the nose being a bit to big for that shallow of a cut. The speeds was prob just fine and temperatur can affect it but shouldnt after just one previous cut.

[@GeorgeMLong]

Looks like there is some build up on the insert also, not allowing the chip breaker to preform at all

[@Moronicsmurf]

@@GeorgeMLong may be it as well. But wnmg needs a heavy cut to break chips. :)

[@DavidHerscher]

That’s not necessarily the case. DOC, speeds, feeds, they all affect sfpm, which determines what type of chip your gonna get. Holy smokes I didn’t realize this video was a year old until i after I posted my comment haha

[@Moronicsmurf]

@@DavidHerscher it's been a wild ride. :D

[@siraig]

That programing was kinda embarrassing. Why (esp when using fusion/cam) are you taking such low depth of cuts?

[@nikolaiownz]

Whaat? Clearly hes was going full depth of cut.

[@siraig]

@@nikolaiownz I'm just going to ignore your comment, because it's clear you either have no Idea what you're talking about, or you didn't even watch the video. I counted 3 ramps for this simple part.

[@nikolaiownz]

@@siraig 🤦‍♂️

[@siraig]

@@nikolaiownz I'd be face-palming too if I commented without watching the video.

[@alexgeist653]

I agree that was terrible. This is a CNC part all day. I seen both poor tool pathing as well as a poor choice of tooling in this video. If i had the model supplied to me I could produce that in less than a half an hour provided I had a 1" indexable mill and a .5 solid endmill already in the carousel (which I always do). Could it be made manually? Yess. Would it stand a shot in hell in the $/hr game? Fck no

[@swisstoolmaker7684]

at 11:02 you drill a hole without centerdrilling it before, was this because you gonna turn out the hole anyway afterwards?

[@martinfidel7086]

It's also a short hole so deflection will be less of an issue, but to be correct he should have run a C/Drill on the manual and then use carbide drill only in the CNC, I only use a C/drill on a CNC if it requires centres for the lathe or grinder

[@joeshmoe5935]

In making that first part I seriously feel like you could have drastically gone up on your axials and down on your radials.

[@martinfidel7086]

I find this a lot with ex manual operators and they will often be running far too shallow and far too slow etc...I call it "manual lathe disorder"

[@Krzewo86]

THe cooland don't where it's supposed to and there's some air cutting

[@cernndomga8160]

You would get a better reading with a bore guage

[@martinfidel7086]

did you mean a bore mic ?

[@cernndomga8160]

@@martinfidel7086 no it's called a bore gage not mic look it up

[@martinfidel7086]

@@cernndomga8160 A gauge is not as accurate as a bore micrometer, I don't need to look it up as I use both daily

[@cernndomga8160]

There the same I use them too If you Google bore gage and bore mic it's the same thing

[@martinfidel7086]

@@cernndomga8160 Only when some muppet mis labels them ! Google uses information that it gathers from people that don't always know what they are talking about ! a bore mic is a calibrated device that you can read the measurement directly off the scale (either manual or digital) a bore gauge needs another device to confirm it's measurement. go look at Mitutoyo.com

[@chrisward3923]

Onsie twoosie, either way is good. If that is a production part it belongs in a twin spindle mill turn machine.

[@martinfidel7086]

not really, a simple 3 axis mill turn with bar feed would do the job just as well, and would save material costs.

[@angrydragonslayer]

@@martinfidel7086 how would you clean up the second side then?

[@martinfidel7086]

@@angrydragonslayer just part it off and then feed the bar for the next one.

[@angrydragonslayer]

@@martinfidel7086 ah... You wouldn't....

[@martinfidel7086]

@@angrydragonslayer why wouldn't I do something that I do hundreds of times per day ???

[@ixchando6458]

Ridiculous to generalize which is better or faster, to many variables.

[@brandons9138]

Exactly. They are both equally important for different reasons at different times.

[@03hugger883]

I did not see the mill work done in the manual process.

[@DieselCrawler86]

I assume where this is part 1 that will be in part 2

[@komoru]

You did not watch until the very end of the video. He explains.

[@hms1688]

Good work!!! We also have rich experience in sheet metal fab, we are a strong manufacturer in China, with high quality and competitive price.

[@yasnac7576]

Aluminum love to be cooled by kerosene. Just a little on a brush . Especially on that soft grade of AL.

[@jimsmolarek8430]

What a terrible comparison! I started machining in 1962 and programmed later in life and today have a manual machine shop. I can machine parts for the race guys that cnc could not imagine. This gives folks a bad comparison. I also worked on the number 3 and 4 milwaukee matics ever made at Gisholt lathe corp. I am still machining!!!

[@martinfidel7086]

Can you explain what a manual machine can really do that a CNC machine cannot imagine ?

[@brandons9138]

@@martinfidel7086 I wonder that as well.

[@cernndomga8160]

If this a school you should have better measuring equipment not those old O.D mics

[@valeriegrama]

Lol