Why Would You Ever Use CONVENTIONAL Milling??? | Climb vs Conventional

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[NateAIM]

When cutting plastics, you'll get less fuzz on the part with conventional. Also, you can get straighter side walls (less taper) with conventional. I don't use it often but it can be useful at times.

[michaelslee]

Was in a shop with a very experienced fellow machinist on a CNC mill and a was getting poor tool life from cutting some laser cut parts. I told him to conventional mill them and he was horrified at the thought but ended up getting 4 times the tool life. Sometimes it’s just better to get under the hard skin rather than crunching onto it.

[theupscriber]

Excellent video. I'm an old toolmaker and we used conventional almost always on our manual mills because we didn't have zero lash lead screws so the part would try to jump forward during climb milling. Nice to see the technical advances that allow the option to climb mill.

[dzarren]

2:23 isn't strictly true, even in climb milling, the flutes of the cutter still cause cause upwards cutting forces on the part. Just because you are feeding in a different direction does not mean the cutter is going in the opposite direction. The cutter is still turning in a right-handed fashion, thus the flutes on a conventional end mill still will exert an upwards force.
The thing about pushing work pieces downwards is only true when the cutter has a LEFT HAND SPIRAL, but still cuts right handed. That is, it still rotates and cuts in the conventional right handed direction, but the flutes of the end mill have a left hand helix to them. This is the only scenario resulting in downwards cutting forces on the work.

[markjones]

I work in aerospace and we are using 30, 00rpm spindles with 150hp milling large structural components. We have went back to using conventional when finishing. Using a 1/2" dia 4 flute we are taking 1" doc or up to a 10:1 wall thickness to height ratio. Using conventional cutting we are able to feed at over 400ipm and not have these thin flanges push off enough to be a problem.

[jacorral]

Conventional cutting works better in foam in my experience. Climb milling tends to push the foam into the part since the foam is pretty compliant, leaving a subpar finish. Conventional leaves a nicer finish in the foams I've cut, since it's peeling the foam away rather than compressing it in.

[karlomoharic]

It depends on application and machine used. Good machinist know the difference and know how to use that to their advantage

[iamthepeterman]

Great video! I have two other thoughts that might help someone else out too.
1 - the conventional approach to case hardened material also works amazing for flame cut profiles. Use a heavy stepover and get under the slag in virgin material and pop off the slag. Then climb cut once the slag is gone. Great for weldments.
2 - I once made some parts with a 10” diameter bore by 4 inches deep that needed less than .001 taper walls and a critical diameter. Taper was a serious concern and the material was a hardened 15-5 stainless. I ended up using a 1 in dia Fraisa 11 flute finisher and climb cut to size using air only (CAT40 spindle). The walls were tapered by .0015 or so. Then I ran a conventional cut spring pass. What that will do is suck the button of the endmill into the cut a straighten the wall. Then did a final ghost pass climb to fix any smear and ended up with walls with .0002 taper. Amazing. Real life saver to learn that trick from Fraisa apps.

[brianmiller]

Conventional milling is also used when milling brittle materials. Brittle materials typically can't withstand the high cutting forces exterted as the cutter leaves the material, causing fracturing and chipping of the base material. I learnt this milling PVC.

[seanallanhaythornthwaite]

Conventional cutting was used on a manual Millers climb milling on these old miller's will pull your part in or through

[markmall]

Everything said here is correct.But 5 extras points.
1)Climb milling extends cutter life 2 fold, even more denpending on circumstances.
2)Ive climbed 57/58 Rc without issues so i would still recommend climb.
3)coventional does induce less pressure on work pieces so as you said thin extrusions, unsupported nylons and plastics can benefit from this stance.
4) I would still conventional mill with slitting saws.
5) Like you said it comes from manual machinists struggling with grabbing but one can overcome it .

Thanks for the channel and this insights shared.

[thegregdavieschannel]

Climb is definitely a more efficient way to remove stock, however if you can do conventional milling on a return stroke it could be faster overall than a non cutting return pass with positioning move as shown at the start of this video.

[turbolevo]

Conventional milling is useful for loading out backlash in knackered machines and for balancing forces in parts that move/flex whilst machining.

[jamesnizzy]

Always wanted to know this, I've been taught about conventional and climb milling but conventionally milling has always been avoided. Nice to understand the applications of it!

[martynbrooke]

I started my apprenticeship in 1973. Small company with more backlash than you would believe. One M/C had over 3/8” (10 mm) of backlash. If you climb milled you always snapped the cutter unless you were very quick to disengage the feed. Visiting a small company last year not much had changed. If not a CNC m/c ask somebody as not everybody has the best tech to do a job.

[theotherJarvisx]

good to see someone who has some understanding of the two.

mill scale on mild steel is always conventional until part is clean.

[DairyAir]

I’ll never forget the demo for why you don’t conventional and climb cut on a manual machine when I went to TC. An old WWII era horizontal mill with an 1 1/4” hog climb cutting 1” deep and that thing exploded!

[joels]

Spectacular video. I'm just a home gamer, and I've never understood why conventional milling produces such poor surface finish on some materials. This is the best description I've ever heard. Thank you.

[henryhbk]

So useful. Maybe one of the most useful videos you guys have put out in a while. I mean I love the CNC apron watching a tool the size of my forearm blowing into hard steel as much as the next guy, but I way prefer these educational videos that bust myths

[ryansoltwedel]

I was at school for a manual mill class and started working on my first project. Not knowing the difference between the two, I climb milled a part and noticed the tool move, along with the digital readout. I had absolutely no clue what was happening until I did some research and figured out that the machine wasn’t rigid enough for it. I genuinely thought I broke the machine because of a .050 pass