This KNOWLEDGE Will Ease Your Pain and Suffering When Attempting to Machine Perfect Parts

Get rid of Chatter in YOUR Parts

How to get rid of chatter in your parts. Travis walks you through how to get rid of chatter and achieve a better surface finish on your CNC machines. The tips and tricks he teaches today are on DN Solution’s TTSYYB Twin Turret Lathe using Kennametal Boring Bars and Inserts. From a 227 Ra to a 22 Ra. We hope this video provides the techniques you need to get rid of chatter in your machine shop.

Subscribe to our podcast channel:
@titansofcncpodcast

___

THANK YOU to our Partners who make this content possible:

#Machining #Machinist #Engineering

[GeraldWentland]

As a experienced oil field machinist used to doing deep bore work
If your looking for a good finish use a 55 degree D insert and back bore that same cut from inside to the face
Chips will stay behind tool
No chip rub or damage and it will be way better

[tuttebelleke]

An old colleague who freaked about vibrations on the late, solved about all of them with rubber and sand. He had a whole box full of rubber parts of all kind, seals, inner tires, O-rings, .... He fixed them over or inside the part to be machined, added sometimes some more, until he eliminated the vibrations. He had also a set of selfmade cutting tools that he turned hollow at the end and filled with sand or oil and sand.

[deags]

Call me old school but I was taught that the cut should be bigger than your radius, this stops the vibration. Would you believe it the smaller insert worked better but I bet if the larger rad insert was given a bigger cut it would also work fine

[Sara-TOC]

Chatter, one of the most common nuisances in the machine shop. Great video, Travis!

[trevorgoforth]

Why do I feel like this video was intended to be an internal training video for Barry and some how got leaked on YouTube 😂

[lcjjr.]

With a steel bar anything over a 4 to 1 ratio will chatter as a general rule.
I’ve gone up to 12 to 1 with a solid carbide bar or even higher with a Sandvik Devibrator boring bar. Great video. Thanks for all your hard work and expertise!

[JS-csgz]

Good video Travis! I haven't ran a CNC lathe for many, many years. But this video walks you through what can take months and maybe years of learning how to apply the right holder, the right insert, the right feed, the right spindle speed to achieve the correct surface finish in about 15 minutes. It is a must watch for all newbies. Learn something new and save the time and the headache of learning the hard way.

[jbrownson]

Great video, it’s so useful to see the actual results of doing things different ways rather than just being given a rule of thumb

[willhutton]

I learned this the hard way. Was getting a lot of chatter in my parts, so I switched the feed to .005 ipr and .035 D.O.C. For a .0086 radius carbide cutter. Immediately I got a 23.56 RA. On the hard parts, I use ceramic inserts with a .016 radius. .005 D.O.C and .005 ipr. Got a 15.8 R.A.

[bekcnc]

The comparison between the carbide shank and a dampened shank would be very cool.

[markdavis]

Solid advice Travis. You can tell a lot of time was involved making this super informative. Great work editors!👏

[lvxleather]

The new generation of machinists are really lucky to have so much knowledge available. It was like pulling teeth to get old machinists to show you tricks back in the day.

[genesisprecisionllc]

Thank you for this test! Such good information! When you are in deep in a job and run into these issues, it's one of those things you wish yourself you slowed down and took the time to run a test like this. It takes a huge amount of resources to run test like this. Much appreciated Travis! Great job!

[TJ-wgud]

Okuma variable spindle (M694/M695) works awesome for getting rid of chatter. I still do everything I can with tooling/ programming but I haven’t had to duct tape a strap clamp to a boring bar since I started using variable spindle 😂.

[ehinders]

It would also help to turn the OD after finishing the bore so the material is more rigid

[kalebfrog]

CNC lathe guy here. I use a method “tuning the boring bar” by adjusting the screws in the holder (front screws loose, back screws tight). I always use full slot holders so my set screws engage with the bar directly. I also usually try to run a finish pass of about .007”. My chatter problems have been heavily mitigated.

[LandonN]

Thank you guys for this video. Seeing this testing/process using fixed and changing variables to teach us how to solve a problem was super helpful. PLEASE do more videos like this!

[senorimotor]

This is an excellent video! Going to use it for training. Thank you Titans of CNC Machining!!!

[tomrobert]

Machining in all my years for the best Ra in boring finishes was to use a burnishing tool. You can get a 2Ra once burnished just leave the bore .0005 to .001 undersize. then burnish it.

[philipstevens]

The whole video is to make all the people here in comments look stupid. Would’ve been a descent comparison if all the parameters were the same like how you said the “feed rate will be locked in place” and then changed it. After the first piece you changed the macro, went from 750 sfm and cut it in half to 375 sfm, then stepped down the depth of cut from .030 to .020, then changed the feed from .004 to .0024 and all descending in that same order from a steel bar with a large radius to carbide with the smallest radius.

A real test by a real machinist with real world costs who wants to help a novice get better at his craft and not try to push product would be to leave everything EXACTLY the same and run with it with a vibration meter on the base, that’ll actually show you something.

Bet me that I can’t do better than your best ra with a steel bar and the middle insert on the same machine if ra is what your going for and you’ll loose and you know it, that’s sad and no way to pass along any kind of knowledge to “ease the pain….” of chatter. I wanted to see the test to compare the differences but there was no comparison. Instead heard a slow way of saying if you turn everything way down and have a sharper bit with a stiffer bar things will improve, could do that with one bar and insert and changed parameters like you did to reduce chatter for improved ra.

***Dont be mislead, watch some other videos, don’t buy expensive tooling you don’t need in place of knowledge or knowledge that’s shadowed for their gain***