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ronsmith100
08-06-2006, 04:45 PM
Hi... I am ron smith, the keeper of the Virtual Machine Shop.
Go take a look
http://www.jjjtrain.com

I am writing a new lesson on the VMS... its about boring on the lathe.
I have plenty of pictures and videos of standard boring but I an looking for pictures of the unique type of boring one can do.
For example, does anyone have a picture of the work peice on the cross slide and the boring bar in the headstock?
Anything else that is non-standard?

Anything would be appreciated.

Thanks and let me know

Ron

nheng
08-06-2006, 04:57 PM
Ron, I have several older books with examples of "line boring". They may be old enough to avoid copyright issues or you could seek permission to use if necessary. I'll look for them later tonight.

There may have been some examples on this forum of boring with a boring head mounted in the headstock. Den

ronsmith100
08-06-2006, 05:06 PM
I think it was here last year.
Somebody mounted small engine (single cyl) on the lathe cross slide.
They then fashioned a long boring bar that chucked in one end, passed through the cylinder block and was supported by the center in the tailstock at the other end. The boring tool set in the middle of the boring bar.

The boring was accomplised by turning on the headstock and passsing the cylinder block along the ways via the carriage feed.
Very trick!!! anyone who can get me that photo will get a creidt line on my site.

Thanks for reading

Ron

Evan
08-06-2006, 05:31 PM
http://vts.bc.ca/pics/bore3.jpg

http://vts.bc.ca/pics/bore6.jpg

http://vts.bc.ca/pics/bore5.jpg

http://vts.bc.ca/pics/bore7.jpg

Evan
08-06-2006, 05:39 PM
http://vts.bc.ca/pics/drill1.jpg

http://vts.bc.ca/pics/drill2.jpg

http://vts.bc.ca/pics/faceplate1.jpg

http://vts.bc.ca/pics/mill06d.jpg

JCHannum
08-06-2006, 05:52 PM
Another approach was here;

http://www.homeshopmachinist.net/bbs/showthread.php?t=14041&highlight=john+deere

The casting was such that a through bar could not be used, so a stouter bar mounted in the chuck only was required.

Also includes a toolsetting micrometer.

ronsmith100
08-06-2006, 06:17 PM
Will you guys - if you are willing - email those pictures to me as an attachment? The email just says I can use them in the Virtual Machine Shop. Include your first and last name so I get the credit right.
ronsmith100@gmail.com

Thanks!

Ron

rockrat
08-06-2006, 06:37 PM
Sent ya some.
Good luck.

rock-

Evan
08-06-2006, 07:45 PM
Go ahead and use any of the ones I posted. I don't post anything that I expect to keep control over. My name is Evan Williams. You can just copy them from this page.

winchman
08-06-2006, 07:53 PM
I think the pic you're looking for is about 1/3 down on the second page of this thread:
http://www.homeshopmachinist.net/bbs/showthread.php?t=11478&page=2&highlight=engine+boring

http://www.illinoislivesteamers.com/images/484%20Cyl%20Boring.jpg

Roger

ronsmith100
08-06-2006, 08:04 PM
Go ahead and use any of the ones I posted. I don't post anything that I expect to keep control over. My name is Evan Williams. You can just copy them from this page.
I am not in control over what is kept here. Your permission may vanish some day.
If you email, that is differnet. I'll archive it.

Thanks

Ron

bob308
08-06-2006, 09:11 PM
evan there was a thread where they said s-b lathes were very limited on what they can do. i guess no one told your lathe that. mine either.
i had a job where the 16" extrusions had to be bored in one pass not come in from each end. well i made a long boring bar and bolted the parts to carrage. did about 200 of them. no one could think of how i did it and i was not talking.

Evan
08-06-2006, 09:20 PM
Ron,

I will e-mail you Tuesday when I am back at work. I don't do e-mail at home.

kap pullen
08-06-2006, 10:54 PM
ronsmith,

Here are some shots of a Case engine frame I machined for a friend lately.

This casting is about 24 inches long and the cross head "tunnel" is about a foot long.

A piece of scrap hrs was centered and drilled for a tool bit for the boring bar.

A part like this must be setup carefully to insure the finished casting walls come out uniform and all features clean up properly.

http://img.photobucket.com/albums/v206/kappullen/DSCN0364.jpg

http://img.photobucket.com/albums/v206/kappullen/DSCN0367.jpg

This is my 13/40" gap bead lathe purchased nearly new in 1982.

I also have a "bar tell" gauge made of a micrometer head on a vee block for adjusting the tool.

http://img.photobucket.com/albums/v206/kappullen/DSCN0375.jpg

A home made facing head with a "star" wheel was used to face the part in the same setup, assureing that joint face and bore are dead true.

http://img.photobucket.com/albums/v206/kappullen/DSCN0378.jpg

The brass star when swinging past the pin in the bottom of the picture turns one point advancing the head a couple of thousanths.

Continued;

Kap

kap pullen
08-06-2006, 10:58 PM
Here is another view of the star wheel at work.

http://img.photobucket.com/albums/v206/kappullen/DSCN0377.jpg

Old cylinder boring rigs used a traveling boring head advanced with a star wheel similiar to some portable boring rigs.

When I was an apprentice boy a hundred years ago we had a 100" vertical boring mill setup for boring cylinders up to 72" diameter and 72 inches long.

The bar was near a foot in diameter.

Hope these pics help like the other fine work displayed here.

Well, looks like I posted these in the wrong thread. Oh well, it's late.

Kap

JCHannum
08-06-2006, 11:06 PM
It's never too late to hear from you Kap.

Here's a photo I took at the Ford Museum of a portable boring machine. These engines were too large to conveniently dismantle and move when a rebuild was needed, and portable boring machines were brought to the site.

It was powered by the pretty little steam engine at right the side.
http://members.aol.com/jchannum/portbore

Mike Burdick
08-06-2006, 11:35 PM
http://www.illinoislivesteamers.com/images/484%20Cyl%20Boring.jpg

Roger

Roger,

That's an interesting cross-slide table. It looks like it has dovetails cut into it so that it replaces the original cross-slide completely. Is that true? If so, that is a very good idea!

Mike

Millman
08-06-2006, 11:46 PM
Kap....thanks for the memories!

ronsmith100
08-06-2006, 11:53 PM
Would a follower rest make sense with a bar that long?
Just asking

R


ronsmith,

Here are some shots of a Case engine frame I machined for a friend lately.

This casting is about 24 inches long and the cross head "tunnel" is about a foot long.

A piece of scrap hrs was centered and drilled for a tool bit for the boring bar.

A part like this must be setup carefully to insure the finished casting walls come out uniform and all features clean up properly.

http://img.photobucket.com/albums/v206/kappullen/DSCN0364.jpg

http://img.photobucket.com/albums/v206/kappullen/DSCN0367.jpg

This is my 13/40" gap bead lathe purchased nearly new in 1982.

I also have a "bar tell" gauge made of a micrometer head on a vee block for adjusting the tool.

http://img.photobucket.com/albums/v206/kappullen/DSCN0375.jpg

A home made facing head with a "star" wheel was used to face the part in the same setup, assureing that joint face and bore are dead true.

http://img.photobucket.com/albums/v206/kappullen/DSCN0378.jpg

The brass star when swinging past the pin in the bottom of the picture turns one point advancing the head a couple of thousanths.

Continued;

Kap

winchman
08-07-2006, 04:33 AM
Mike,
It certainly looks like he made a cross-slide table to support anything he wants to bore. Judging from the amount of blocking under that part, it'll work for boring much larger parts.

The picture was posted by Carl in the earlier thread. I just happened to remember bookmarking it because it looked so interesting.

Roger

JCHannum
08-07-2006, 08:55 AM
Would a follower rest make sense with a bar that long?
Just asking

R
A follow rest would be impossible to mount, as they are mounted on the carriage where the cylinder is mounted.

Follow rests are used to support the work, and keep it from flexing from the pressure of the cutter. Since the cutter is in the bar, the forces are not in one direction. It does pay to use the largest diameter bar avaliable that will fit through the bore.

Mcgyver
08-07-2006, 02:47 PM
some impressive set up's guys.....I always thought the lathe manufactures would have done well to have taken a page out of Myford's book and made the cross slide with T-Slots!! would make these horizontal boring ops, back mounted parting, etc so much easier.

ronsmith100
08-07-2006, 08:48 PM
A follow rest would be impossible to mount, as they are mounted on the carriage where the cylinder is mounted.

Follow rests are used to support the work, and keep it from flexing from the pressure of the cutter. Since the cutter is in the bar, the forces are not in one direction. It does pay to use the largest diameter bar avaliable that will fit through the bore.

Whoa! right on... did not think about the forces changing angle constantly.
But I do think two followers with at least three rollers could be made to slide along with the carriage as long as the boring bar diameter was dead nuts for the whole length and one did not try to BORE the followers (read stop feed first).

I cant remember (I am 64 now and that is a pretty regular occurrence) but I had something similar at the Naval Shipyards once... we mounted each wooden-and-greased follower with a big mofo valve spring that took up some of the run out.

I hate forgetting.

Cheers and thanks to all

Ron