Beveling Pipe Chatter Issues

[pineyfolks]

We did many of those when I was in school for the welding class. If I remember correctly we didn't cut the chamfer to a point. We left a small step about 1/8"x 1/8 so when they butt up there was a 1/4" flat at the root of the weld. They may do it different now days.

 

[Strtspdlx]

We did many of those when I was in school for the welding class. If I remember correctly we didn't cut the chamfer to a point. We left a small step about 1/8"x 1/8 so when they butt up there was a 1/4" flat at the root of the weld. They may do it different now days.

I do mine slightly smaller something like .050. But I also run a very small gap and higher amperage


Regards-Carlo

 

[Strtspdlx]

Carlo,

You say you parted the 5" pipe okay 1-1/2" from the chuck. Did you try beveling that short piece to see if you have chatter like you do with 10" overhang?

Tom

No I didn't. I'n going to assume it will for the moment. Right now I don't have time
To check because the transmission in my truck went on me. As soon as I repair that I'll be back to machining. Well that's if I don't have to machine any parts for the transmission.


Regards-Carlo

 

[stevemetsch]

I have the same lathe and was getting chatter on cutting a 4" disk from a steel plate by trepanning. I tightened down all of the gibs, sharpened my cutoff tool and chatter was gone.
Give it a try. Why it worked before doesn't matter as long as you get it done.

 

[Strtspdlx]

I'm not having problems parting. I realized after a few times that for parting unless you're feeding pretty consistent and have a pretty good amount of pressure on the tool it works fine. Not enough pressure and it chatters and wanders and won't part anything correctly.
As for the beveling here's another question. I'm trying to put a 37.5* bevel on the pipe if I set my compound to 37.5* would I be getting the correct bevel or should I be setting it to 52.5*?

 

[Tony Wells]

Depends on two things. Angle from face or centerline? Where is your datum (index) mark on the compound? This is why I like 45°......Doesn't matter.

 

[Strtspdlx]

Depends on two things. Angle from face or centerline? Where is your datum (index) mark on the compound? This is why I like 45°......Doesn't matter.

I'm not all that educated. The angle I'm referring to is off the face. They want a 60* included angle to weld the pipe together. My index mark is beneath the compound on the cross slide and 0* is a mark on compound. I tried measuring 37.5* and I have a bit of a gap like I should have more of an angle.


Regards-Carlo

 

[Tony Wells]

OK, 60° included means 30° from the face of the pipe end. With your compound perpendicular to the lathe ways (parallel with the face of the pipe), look at your degree markings and swivel the compound 30° from that position. It will be either marked at 0° or 90°, so you will end up at either 60° if it is 90° on the face, or 30° if it is 90° on the face.

Hope that isn't more confusing.

 

[Strtspdlx]

OK, 60° included means 30° from the face of the pipe end. With your compound perpendicular to the lathe ways (parallel with the face of the pipe), look at your degree markings and swivel the compound 30° from that position. It will be either marked at 0° or 90°, so you will end up at either 60° if it is 90° on the face, or 30° if it is 90° on the face.

Hope that isn't more confusing.

Yeah that confused the heck out of me ha.


Regards-Carlo

 

[Tony Wells]

Your compound should be set at 30° to achieve a 60° included angle between the two pieces of pipe. You are cranking the compound to make the cut, right?