deep deep hollowing info requested

Re: deep deep hollowing info requested

John Lucas

>Jeff

Look up anything you can find on Ed Moultrhoup and Frank Sudol. Ed has passed on but Frank is still around and they both do deep hollowing. If you've got money Frank is taking students I think. I think he used a 2" boring bar to do the 36" pieces. There was an article in American Woodturner on what size bar is needed for certain depths. I'll see if I can find it.

It's hard to beat the steady rest sold by John Nickols but you can probably build one if you have welding and/or machining skills. I built mine out of plywood and if beefed up would probably support a fair amount of weight. The wood should be balanced by the time you get the steadyrest on there so it won't be supporting a huge amount of weight.

With that much weight on the tool rest you might want to beef it up. Frank took a piece of All thread that fit in his banjo and welded a bar on top for the tool rest. Then he put a couple of nuts on the all thread so he could "micro" adjust the tool rest height and then lock it. He also welded some dots on the top of the tool rest on the ends to keep the boring bar from sliding off.

Re: deep deep hollowing info requested

John Lucas

>Jeff

American Woodturner vol.16 no.3 page 40. An article by Dale Hupp entitled Is it Heavy Enough. You may have to be a math major to deciper this but he gives you formulas and discusses why. I can't do the math but one of his examples is a 1.5" bar he says it will go 36" deep.

There is also an article ahead of that one by Steve Sinner on building your own captured bar boring bar system. John

Re: deep deep hollowing info requested *LINK*

JHS

>Try this site.


Serious Lathe

Re: deep deep hollowing info requested

Al Crandall --NE of Indy--

>In my garage stands a 1 1/2"diameter x 4' long bar of 1018 cold rolled steel which is dedicated to making a boring bar. I plan to hollow at least 2' deep with it for a future series of projects. When I called around the central Indiana area, I got prices for the bar ranging from $42 plus tax to $19.75 including tax. Can you guess which one I bought? I have a four wheel steady rest which will slide over and support a 23" diameter turning, but the bed extension and hollowing support has yet to be constructed. Don't let "them" overcharge you for the bar.

Re: deep deep hollowing info requested

MP Wall

>The Steve Sinner article on boring bars is a must read if you are going to build a big boring bar system. I would think a 2" bar is order for 30-36" deep boring system. Round bar stock welded together should suffice for the boring bar, the business end is up to you. The captured end should be beefy, I would figure 1 1/2", 1/4" thick square bar stock would suffice the back end with 3/4" threaded rod holding it together. MP Wall

Re: deep deep hollowing info requested

David Galloway

>Don Duden has a great design on a stout boring bar. You might give him a call. All of us Atlanta turners were drooling at his bar. Don is one of the most creative "tool" smiths in our group.

I have also been impressed with Don Derry's system although it is with smaller vessels than I think you are talking about.

Is there a reference to the Sinner article in terms of issue?

Thanks

David Galloway

Re: deep deep hollowing info requested

jeff jilg

>Thanks for the answers for far. I very much appreciate the information. Especially the info about the articles in the AW Journal. I'll obtain the CD with those back issues in it since I only have issues back to vol 17. It's difficult to determine the content of the article from the AW online index.

A project like this doesn't happen overnight. The main problem is that I keep visualizing all these neat big vases in the free green wood I'm getting. And without the equipment the pieces get cut down into much smaller items.

John - I hadn't thought about the toolrest, but your advice on that makes sense.

From the info so far, it looks like 2" stock will be needed.

thanks...Jeff