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#11
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"...but I don't have a lathe."
Michael Horowitz wrote:
On 17 Aug 2005 10:57:42 -0700, wrote: "...but I don't have a lathe." in this article, Bob describes how to chuck something like a 2" washer (using a coupling) so that one can reduce the washer's diameter. I'm staring at a piece of 11/16" 4130 steel tubing, three inches long which is supposed to slip into a piece of 3/4 OD tubing and act as an inner sleeve. this inner-sleeve-to-be needs to be turned just a scooch so that it will fit. It seems to me that there must be a simply way to do this; I immediately go to to the most Rube Goldberg arrangement I can dream up. At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke If your live end cone is big enough that takes care of that end. A wood dowel forced into the other end takes care of that end. Make your own dowel and LEAVE it in the chuck when you put the tube over it. If you move the wood it will never again be true to you. If you'd rather use a metal dowel/tube you may need to use Locktite™ to keep it from slipping. That's where the fun ends, removing the metal dowel/tube is a great deal of fun since heating everything to at least 300º to soften the Locktite™. Again, leave the dowel/tube in the chuck until you are done working. There is a third way if you have a piece of round stock long enough to go through the tube. The round stock has to be greater in diameter than the ID of the tube. Start by using a center drill on the end of the round stock to put your live end into to prevent wobble. Then turn the round stock down so you have a length longer than the tube and a slip fit. You then thread the end and use a washer and nut to secure the tube. The nut should tighten the tube against the shoulder where you turned down the round stock, not the chuck. Tightening against the chuck will ensure you pull the round stock out of the chuck when you tighten the nut. Again, leave the round stock in the chuck until the work is complete. Hex stock can also be used. BTW, you shouldn't use technical terms like "a scooch" in this group since it is obscure. I prefer "a tad." Dan, U.S. Air Force, retired |
#13
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"...but I don't have a lathe."
Dan wrote: Charles Vincent wrote: Michael Horowitz wrote: On 17 Aug 2005 10:57:42 -0700, wrote: "...but I don't have a lathe." in this article, Bob describes how to chuck something like a 2" washer (using a coupling) so that one can reduce the washer's diameter. I'm staring at a piece of 11/16" 4130 steel tubing, three inches long which is supposed to slip into a piece of 3/4 OD tubing and act as an inner sleeve. this inner-sleeve-to-be needs to be turned just a scooch so that it will fit. It seems to me that there must be a simply way to do this; I immediately go to to the most Rube Goldberg arrangement I can dream up. At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke How much needs to be taken off? Charles He said a "scooch" which could mean "as much as can be removed using emery cloth while watching the news" or "just enough so I don't need a BFH to make it fit." Dan, U.S. Air Force, retired I believe a "scooch" is defined as equal to two RPH's.... John |
#14
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"...but I don't have a lathe."
John Ammeter wrote:
Dan wrote: Charles Vincent wrote: Michael Horowitz wrote: On 17 Aug 2005 10:57:42 -0700, wrote: "...but I don't have a lathe." in this article, Bob describes how to chuck something like a 2" washer (using a coupling) so that one can reduce the washer's diameter. I'm staring at a piece of 11/16" 4130 steel tubing, three inches long which is supposed to slip into a piece of 3/4 OD tubing and act as an inner sleeve. this inner-sleeve-to-be needs to be turned just a scooch so that it will fit. It seems to me that there must be a simply way to do this; I immediately go to to the most Rube Goldberg arrangement I can dream up. At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke How much needs to be taken off? Charles He said a "scooch" which could mean "as much as can be removed using emery cloth while watching the news" or "just enough so I don't need a BFH to make it fit." Dan, U.S. Air Force, retired I believe a "scooch" is defined as equal to two RPH's.... John Or 4 BCHs? Dan, U.S. Air Force, retired |
#15
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"...but I don't have a lathe."
Charles Vincent wrote:
Michael Horowitz wrote: At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke How much needs to be taken off? Charles Put the two washers in a piece of threaded rod. A couple more washers, that fit the ID of the tube, on the inside to locate the tube. Go easy with a file, or even a piece of plumber's tape. The chuck out of a burned up drill, sunk into a piece of hardwood, makes a nice live center in a pinch. |
#16
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"...but I don't have a lathe."
On Sun, 07 Sep 2008 09:32:28 -0500, Charles Vincent
wrote: Michael Horowitz wrote: On 17 Aug 2005 10:57:42 -0700, wrote: "...but I don't have a lathe." in this article, Bob describes how to chuck something like a 2" washer (using a coupling) so that one can reduce the washer's diameter. I'm staring at a piece of 11/16" 4130 steel tubing, three inches long which is supposed to slip into a piece of 3/4 OD tubing and act as an inner sleeve. this inner-sleeve-to-be needs to be turned just a scooch so that it will fit. It seems to me that there must be a simply way to do this; I immediately go to to the most Rube Goldberg arrangement I can dream up. At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke How much needs to be taken off? Charles ..014 - MIke |
#17
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"...but I don't have a lathe."
On Sun, 07 Sep 2008 09:39:18 -0500, Dan wrote:
Charles Vincent wrote: Michael Horowitz wrote: On 17 Aug 2005 10:57:42 -0700, wrote: "...but I don't have a lathe." in this article, Bob describes how to chuck something like a 2" washer (using a coupling) so that one can reduce the washer's diameter. I'm staring at a piece of 11/16" 4130 steel tubing, three inches long which is supposed to slip into a piece of 3/4 OD tubing and act as an inner sleeve. this inner-sleeve-to-be needs to be turned just a scooch so that it will fit. It seems to me that there must be a simply way to do this; I immediately go to to the most Rube Goldberg arrangement I can dream up. At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke How much needs to be taken off? Charles He said a "scooch" which could mean "as much as can be removed using emery cloth while watching the news" or "just enough so I don't need a BFH to make it fit." Dan, U.S. Air Force, retired Damn, he's good! - MIke |
#18
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"...but I don't have a lathe."
Here's how I ended up 'chucking' the tubing.
I used Bob's trick to reduce the diameter of 4 washers to just smaller than the ID of the tubing. I mounted this combination on a piece of threaded rod at either end of the rod sticking out of the tube: nut, washer, grommet,washer,nut. When I tightened the nut, the grommet expanded and held the tube in place from the inside. I"ll keep my eye open for a dead drill so I can use the chuck as a 'tailstock' Now the mystery..... the ID of the outer tube should have been .694 and the OD of the inner tube .680, giving me .014. I thought I'd be able to slip that right in, but ended up having to turn it down. I'm going out there and remeasure the ID of the new stuff I'm back. The stuff I ordered was advertised as 11/16 which if you divide = .680 The measured OD of the 3/4" tube minus 2x the wall thickness of .028 gives an ID of .694. The 11/16 should slip in. An actual measurement of the 11/16 yields .690! .010 thicker than expected. Is this lack of precision to be expected and planned for? - Mike |
#19
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"...but I don't have a lathe."
Michael Horowitz wrote:
Here's how I ended up 'chucking' the tubing. I used Bob's trick to reduce the diameter of 4 washers to just smaller than the ID of the tubing. I mounted this combination on a piece of threaded rod at either end of the rod sticking out of the tube: nut, washer, grommet,washer,nut. When I tightened the nut, the grommet expanded and held the tube in place from the inside. I"ll keep my eye open for a dead drill so I can use the chuck as a 'tailstock' Now the mystery..... the ID of the outer tube should have been .694 and the OD of the inner tube .680, giving me .014. I thought I'd be able to slip that right in, but ended up having to turn it down. I'm going out there and remeasure the ID of the new stuff I'm back. The stuff I ordered was advertised as 11/16 which if you divide = .680 The measured OD of the 3/4" tube minus 2x the wall thickness of .028 gives an ID of .694. The 11/16 should slip in. An actual measurement of the 11/16 yields .690! .010 thicker than expected. Is this lack of precision to be expected and planned for? - Mike Industry standards give plus or minus tolerances. There is such a thing as precision stock, but you pay for it. Structural tubing rarely requires a high degree of precision. Dan, U.S. Air Force, retired |
#20
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"...but I don't have a lathe."
On Sun, 07 Sep 2008 09:39:18 -0500, Dan wrote:
Charles Vincent wrote: Michael Horowitz wrote: On 17 Aug 2005 10:57:42 -0700, wrote: "...but I don't have a lathe." in this article, Bob describes how to chuck something like a 2" washer (using a coupling) so that one can reduce the washer's diameter. I'm staring at a piece of 11/16" 4130 steel tubing, three inches long which is supposed to slip into a piece of 3/4 OD tubing and act as an inner sleeve. this inner-sleeve-to-be needs to be turned just a scooch so that it will fit. It seems to me that there must be a simply way to do this; I immediately go to to the most Rube Goldberg arrangement I can dream up. At the moment I'm thinking of turning down two washers so that they matches the ID of the work piece; that will keep the work centered on a piece of threaded rod. Open to other ideas - MIke How much needs to be taken off? Charles He said a "scooch" which could mean "as much as can be removed using emery cloth while watching the news" or "just enough so I don't need a BFH to make it fit." Dan, U.S. Air Force, retired ************************************************** *************************************** Is a "scooch" the same as when us Irish say "A Wee Bit"? Big John |
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