Boring Head Sets

randyjaco link=topic=2701.msg18639#msg18639 date=1310429093 said:
Randy,
I picked up a Criterion DBL-203 at a yard sale years ago. It is a 2" round head, but has the addition of a horizontal tool hole. Thus it will bore from .035" to a whopping 11". There has never been a situation where I needed another boring head. You may be able yo find one on EBay. The newer version is a CB-202

Randy
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Now that you mention it, I have seen heads with the side hole. I just never put 2 + 2 together. Do you mean it will do ALL sizes in between the .035 and 11? And if so, how is this accomplished, I am just not picturing it right now. I mean do you have to cut down a bar length or does the head offset handle this? Thanks for the great info. ;)

Hey, do you have a pic of a setup where you are using the side hole?

This site is great!
 
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The side hole will mount a bar set up to cut feeding up or down, depending in what you are doing. It should hang out near the length required to do the large bore, with fine adjustment coming from the head adjustment.

I can't say I have bored as large as 11 inches, but there isn't any reason it couldn't be done. It would be a slow process however.
 
Tony Wells link=topic=2701.msg18650#msg18650 date=1310436322 said:
I can't say I have bored as large as 11 inches, but there isn't any reason it couldn't be done. It would be a slow process however.
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Tony, I am a hobbyist, I have the time. ;)
 
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When I get a little work done tomorrow, I'll see if I can set up a demo of the method and take a picture or two.
 
Yes Randy, that is exactly what I am saying. This can be accomplished with a full set of boring bars. Mine actually had an adjustable outrigger bar that facilitates the process. When I get a chance I will take some pictures.
Basically it has 2 vertical tool hole and a horizontal one. Using all the holes one can bore a hole from .035" to 11". Realistically few people would go through that whole process. I generally use a big drill bit or a hole saw to get as big as possible initial hole and then finish up with the boring head.

Randy
 
Pics of the set up would be really cool. You guys are a great help on this.

Yes Randy, I realize that one would rough out the contour first. You must understand, up until now I have been using hacksaws, bandsaw, drill press, grinders and files. This mill is going to be great.
 
OK Randy,
I have trouble on this site with my wife's camera. It does 14 megapixel photos. So I have put these pics on PhotoBucket. I am going to try to link them.

http://i640.photobucket.com/albums/uu124/randyjaco/Boring Head/IMG_3136.jpg
This first one shows the boring bar hole configuration

http://i640.photobucket.com/albums/uu124/randyjaco/Boring Head/IMG_3135.jpg
This one shows that there are 2 vertical and 2 horizontal bar holes.

http://i640.photobucket.com/albums/uu124/randyjaco/Boring Head/IMG_3140.jpg
This one shows the accessories that came with it. Note the outrigger at the bottom left

http://i640.photobucket.com/albums/uu124/randyjaco/Boring Head/IMG_3142.jpg
Here is the outrigger set up to provide 11" of boring capability. The outrigger is very beefy and I have had no chatter problems with it.

http://i640.photobucket.com/albums/uu124/randyjaco/Boring Head/IMG_3137.jpg
I through this one in just for grins. It appears to give me @15" of capability. I have never tried it. So with one 2" head I can bore holes from 0.035" to possibly 15". I can't imagine needing another boring head.

I hope that these pics will work and provide the answers to your questions.

Randy
 
Randy J,

This helps immensely, this is exactly the info I am seeking. I really greatly appreciate your sharing of this and taking the time to post the pics. Sorry for being so slow on this. Now do you use the power feed with these set ups?
 
You are welcome.
Oh yeah, after years without a power feed, the power feed on this new mill gets used at every opportunity. I didn't realize what I had been missing.

Randy
 
Randyjaco,

re. your last picture, trying to actually bore a hole running the spindle in reverse, is asking to spin the head off it's threaded shank, with possibly disastrous results--just sayin'.......

Regards

Bob
 
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