Chuck Boring Rings ... or ???

Ox · Tuesday at 4:29 PM

Despite the fact that the bulk of my work is turning, very little of it has been in 3 jaw chucks, and very little of that has been in a hydro chuck, so I could use some help...

The chuck that I would be using most would be a 10" Kitagawa, and the task that I was after just now is trying to bore a through hole, and I'm not getting good run-out when done. I tried with the jaws either open or closed - with no tension - and not good either way.

I have seen these boring rings that go in the bolt holes, and at first those look like the cat's pajama's, but then it dawns on me that you are going to have to install those with the chuck at full open - since a hydro chuck doesn't doo "mid stroke" easily. And I am sure that there would be some wiggle room, and maybe they use an undersized hole plug for just this porpoise - to give you some stroke?

Am I missing sumpthing?

Is there sumpthing better than this for this app?

Also, I find oodles of units on ebay, and I git the feeling that most if not all are import.
The pics that I see all look EXACTLY alike!

Does anyone know of a Yank or Canuck that is making and peddling these?

--------------------------

Think Snow Eh!
Ox

VTM · Tuesday at 4:35 PM

Although It appears that the three lugs on these rings lock into a fixed position. They don't. They float In the slots and when you clamp the chuck that locks them in place. So you can easily clamp at the mid point or wherever you like throughout the stroke of the chuck. You have to turn down your chuck pressure and they can't be run at high RPM. But they are basically Infinitely adjustable through the stroke of the chuck. You will be happy with It.

cunaf85 · Tuesday at 4:45 PM

I like a spider, simple ring with 3 tapped holes 120 degrees apart. Keep it in a box with several sets of bolts so it can be adjusted to fit a wide range of diameters. 650 SFM, F.005 with a DNMG432 makes a finish pass you can see a reflection in on most soft jaws.

Ox · Tuesday at 4:50 PM

VTM:

Please explain how you would use this for a mid point app?
Step by step - b/c I don't see it?

85:

The last thing that I want is a mirror finish on my jaws.

------------

Think Snow Eh!
Ox

VTM · Tuesday at 5:00 PM

Well It looks like the two set screws in each lug lock the lug down. I assume that's what your thinking about how it works? But the lugs are never locked down unless the chuck is clamped on them. So, Open the chuck. Insert the three lugs In the bolt holes. Clamp the chuck. If you desire the chuck to stop Its stroke at a higher or lower postion on the stroke twist the ring clockwise or counterclockwise whichever is required until the chuck clamps at the desired position of its stroke. my explanation Is probably not great, but hopefully you get the idea.

VTM · Tuesday at 5:09 PM

Peter S · Tuesday at 5:19 PM

Ox,

I'm not sure if this helps...I saw this a while back and it shows adjusting the boring ring to achieve the correct jaw stroke position.

But, it sounds like you might have a different chuck, so apologies if it is a waste of your time.

Haas has several soft jaw videos.

13engines · Tuesday at 6:07 PM

I have a couple sizes of those rings and I find them super fussy to get to work. Maddening really. Also a problem with mine is the strokes of both my chucks seem to be slightly to short. I'm almost always wishing I had just a touch more stroke so the pegs would finally fall in place. If you miraculously get the 3 pegs in the jaw bolt holes, you can somewhat control the clamping point by turning the ring while the chuck is closing or opening. Might take a few tries to get it where you want but it's do-able. It will lock up at some point.

I've pretty much given up on them and ended up buying a bunch of different sized rings at the local steel yards retail store, where they've lasered them out of 5/16 or 3/8 stock. Much easier.

Scruffy887 · Tuesday at 7:01 PM

I have used the rings (not flea bay) and am ok with them. I turn the hydraulic pressure as low as possible so the jaws move very slowly. Give the ring a spin to lock it where I want. Adjust to needed pressure and bore. May take a few tries. I have also stuck a small short of the desired ID at the limits deep in the chuck. Bored from there and just wasted the deep part where the slug pre loaded the jaws.
But I don't really know what I am doing, not a machinist.
I have used another method as well.

RC Mech · Tuesday at 7:04 PM

When you say you tried to bore the jaws “either open or closed, with no tension” do you mean the chuck was either bottomed out on the open stroke and/or bottomed out on closed?

If that’s the case you’ll be turning loose jaws. Ain’t gunna werk.

I have one of those rings and a set (made in USA, I can check the name) of 1:4” thick disks with a hole from about 3/4” to 4.5” in a nice wooden stand. I prefer the disks for most everything. Increment is like 1/8” on dia.

SeymourDumore · Tuesday at 7:26 PM

Ox

I have those rings as well as the adjustable type Dorian makes .... like 13 engines said, they are maddening to use.

What I do instead is, let's assume a 2" though bore ...

Chuck open, bore straight through to 2"
Install a very thin ( say 1/4" or so ) ring of 1.95 dia at the very very bottom of the jaws, right at the face of the chuck body.
Clamp onto this ring and bore a 2" dia to the depth just shy of the thin ring.
Unclamp chuck and remove the little ( approx .025 worth of ) remnant from the bottom where the ring was. Anything above 2" will do

This guarantees a positive load on the jaws to make a dead nuts concentric movement of .05 .
If you want to be anal about it ( sometimes you gotta ), then program a small negative taper into the thread, say be 1.996 on the top and 2.0 at the bottom of the jaw.

guythatbrews · Tuesday at 8:03 PM

Back when i had to do this I had a deal that looked like a hollow three jaw universal chuck. The jaws had knobs sticking out that went into the chuck jaw holes. You adjusted it and clamped on it and bored the jaws. It worked great. Don't remeber the brand name. Chuck was 10" kitagawa.

guythatbrews · Tuesday at 8:04 PM

I found it first try. Spendy but worth it if you do this a lot.

6-10" Soft Jaw Boring Ring lathe Chucks Scroll Style

Ox · Tuesday at 9:01 PM

OK, I git it now - the point that the lugs are NOT tight to the ring when in use is the key to my understanding.

So, you are able to scroll the ring while the chuck is cycling, and like someone said, turn the pressure down and it cycles slowly anyway....

Thanks fellas.
I would still be interested if someone knows of a domestic source for these.

--------------------

Think Snow Eh!
Ox

wmpy · Tuesday at 9:25 PM

Maybe these are made in the USA?

Lathe Boring Rings - MonsterJaws Mfg

monsterjaws.com

Mud · Tuesday at 10:25 PM

Ox said:
I would still be interested if someone knows of a domestic source for these.

usshoptools.com has them, don't know where they are made though. They also have these - sometimes they are more convenient, some times they are more of a PITA than the flat rings. They have a scroll inside like a manual lathe chuck.

SeymourDumore · 2023-01-18T00:19:46-0600

Mud said:
usshoptools.com has them, don't know where they are made though. They also have these - sometimes they are more convenient, some times they are more of a PITA than the flat rings. They have a scroll inside like a manual lathe chuck.
View attachment 384333

That one can be had as a US made product from Dorian, and I am pretty sure the Monster Jaws version is also made here.

Jaxian · 2023-01-18T02:27:25-0600

I use the US Shop Tools one also. Works great on my 12" Samchully. Also no clue on origin.

One very important thing to add. You MUST turn down the chuck pressure. I left min at like 350psi cause I was a bit overwhelmed doing it all the first time. The USShopTools ones are hardened and they will break, pop out, and things will clang and necessitate a underwear change. I leave min at like 100 psi.

Mtndew · 2023-01-18T06:35:53-0600

Ox said:
So, you are able to scroll the ring while the chuck is cycling

No. Just adjust it to the stroke that you want, then clamp on it and bore the jaws. The scroll style works pretty good.
One other thing is that you can counterbore the jaw face and clamp onto a ring. We've done this. Just found a chunk of tubing and sawed off a little piece then clamped on it.

guythatbrews · 2023-01-18T06:39:55-0600

Another way trepan a face groove and clamp on a ring.

Chuck Boring Rings ... or ???

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