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Larry Gianni · 01-26-2004, 03:44 PM

Hi TrickG

You know, I asked Zig that same question about leadpipe copying, I wanted him to copy a lead pipe on a pre-war Meha I had that had rot problems.

He told me that with any resin or plastic fill he's tried , and he's got stuff from friends in the aerospace community, when you pull them out either they stretch slightly ( were talking .001 of an inch dimensions ) or the don't hold the exact configuration. It's the removing that is the trick part.

With a computer scan, the computer will also calculate the dimensions again in .001 of an inch, with any irregularity of the cut is found ( slight gouge by the reamer, scratch by cleaning tool, etc ) and calculate the numbers that upon duplication will either fill in the metal void ( gouge , scratch )or protrusion ( burr ) and give you a perfect dimension with no human frailties to it. This is really great if you scratch the rim and want an original dupe made that can be threaded onto the original underpart.

You should see what they go thru to copy a leadpipe, you need the patience of Mother Theresa ( rest in peace ) to handle that plus the 2 days it takes just to get the right accuracy using measuring devices at increments of .001 of an inch.

Let's say they do get a accurate backbore mold. No what. You would need the right technology in machinery to trace the mold , again within .001 tolerance, that would make the exact cutter to cut the backbore and a machine to double check the cut. All computer driven CNC style lathers , plus operators. What do you think that would cost?. Just to get a backbore.

Maybe some other engineers in the group like my new friend Tootsall ( who I know is an engineer, plus a really good writer ) or my good friend Thevor ( again, very intellegent with great communicative skils )could comment on all this. They may better communicate the difficulties of copying opening and closing circular demensions in cyclindrcal openings and making dies and cutter to re-produce then exactly and the cost involved both in machinery, personnel and time.

Larry

01-26-2004, 03:44 PM	#19 (permalink)
Larry Gianni Piano User Join Date: Nov 2003 Location: Los Angeles Posts: 266	Backbore / leadpipe copying Hi TrickG You know, I asked Zig that same question about leadpipe copying, I wanted him to copy a lead pipe on a pre-war Meha I had that had rot problems. He told me that with any resin or plastic fill he's tried , and he's got stuff from friends in the aerospace community, when you pull them out either they stretch slightly ( were talking .001 of an inch dimensions ) or the don't hold the exact configuration. It's the removing that is the trick part. With a computer scan, the computer will also calculate the dimensions again in .001 of an inch, with any irregularity of the cut is found ( slight gouge by the reamer, scratch by cleaning tool, etc ) and calculate the numbers that upon duplication will either fill in the metal void ( gouge , scratch )or protrusion ( burr ) and give you a perfect dimension with no human frailties to it. This is really great if you scratch the rim and want an original dupe made that can be threaded onto the original underpart. You should see what they go thru to copy a leadpipe, you need the patience of Mother Theresa ( rest in peace ) to handle that plus the 2 days it takes just to get the right accuracy using measuring devices at increments of .001 of an inch. Let's say they do get a accurate backbore mold. No what. You would need the right technology in machinery to trace the mold , again within .001 tolerance, that would make the exact cutter to cut the backbore and a machine to double check the cut. All computer driven CNC style lathers , plus operators. What do you think that would cost?. Just to get a backbore. Maybe some other engineers in the group like my new friend Tootsall ( who I know is an engineer, plus a really good writer ) or my good friend Thevor ( again, very intellegent with great communicative skils )could comment on all this. They may better communicate the difficulties of copying opening and closing circular demensions in cyclindrcal openings and making dies and cutter to re-produce then exactly and the cost involved both in machinery, personnel and time. Larry