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Old 04-24-2016, 08:17 AM   #1 (permalink)
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Notching: How do you mark 180 on opposite ends?

Just trying to see how people mark each end of a tube for 0 and 180 and make it accurate. I seem to always be slightly off when I do it. Ive used my pipe master and ran lines down the whole tube, but theres gotta be a faster way.

How do you mark your 0 and 180 on both ends of a tube?
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Old 04-24-2016, 09:54 AM   #2 (permalink)
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Just trying to see how people mark each end of a tube for 0 and 180 and make it accurate. I seem to always be slightly off when I do it. Ive used my pipe master and ran lines down the whole tube, but theres gotta be a faster way.

How do you mark your 0 and 180 on both ends of a tube?
Angle block and a level, or one of those fancy clamp on tube o'levlers.
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Old 04-24-2016, 01:04 PM   #3 (permalink)
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I think it's called a centering head. It's an inverted Y with a level and center punch mounted on it. Read the bubble for the win. Most that I've seen will have a rotating bubble with a rotary gauge.

Otherwise, I'd get a flexible ruler/tape measure. You should be able to pretty easily mark your zero on each end. Then when you have that established, figure out the circumference and divide it by two. Wrap the flexible tape around it and measure off of your mark. I've done this with a narrow piece of thin sheet metal or a piece of paper before as well.
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Old 04-24-2016, 01:05 PM   #4 (permalink)
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Amazon.com: AccuRemote Digital Electronic Magnetic Angle Gage Level / Protractor / Bevel Gauge: Office Products FTW
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Old 04-24-2016, 01:15 PM   #5 (permalink)
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I forgot about the clamp things everyone sells for like 80$. Im gonna cut one out on my CNC tonight and order that accuremote digital gauge,

Thanks guys.
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Old 04-24-2016, 02:21 PM   #6 (permalink)
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I use this.BettyMills: Centering Head Tools - Flange Wizard 496-53025-M
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Old 04-25-2016, 07:38 AM   #7 (permalink)
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This, they work awesome.
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Old 04-25-2016, 07:54 AM   #8 (permalink)
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Lets see if I can make this make sense.. Set the tube on a table. Rotate the tube so your mark is half the tube height off the table. Mark other side of tube at the same height.
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Old 04-25-2016, 08:18 AM   #9 (permalink)
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Lets see if I can make this make sense.. Set the tube on a table. Rotate the tube so your mark is half the tube height off the table. Mark other side of tube at the same height.
Yea thats what Ive been doing before, or using a pipe master to mark it, but It was getting really annoying when Im doing a 50* notch at one side and the other is slightly off and theres a gap.

I cad'd up a mount for a digital gauge, Ill be printing it out tn most likely.
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Old 04-29-2016, 10:19 AM   #10 (permalink)
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Machinists tri-square using the centering "V" head gets your 180* marks.

Lay tube into long piece of straight angle iron and align mark with edge of angle iron. Mark the other end or run a line down the whole damn thing. Rotate and align/mark the other side.
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Old 04-29-2016, 12:28 PM   #11 (permalink)
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Seems like you could buy:

http://www.amazon.com/dp/B006JR8XBG/

And DIY one of these:

http://www.amazon.com/Sumner-Manufac.../dp/B00JMQQQ42

And save ~$90

Or
SWAG Plane Of Bend Bracket
And modify it so you can mark tube for notching.
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Old 04-29-2016, 03:57 PM   #12 (permalink)
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Ended up making one from scrap I had laying around.

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Old 04-30-2016, 07:04 AM   #13 (permalink)
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I used an exhaust clamp and a magnetic level last time... Magnets were weak though so I ended up zip tying the damn thing on.
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Old 04-30-2016, 09:12 AM   #14 (permalink)
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I use a straight edge against my fab table to mark one side of the tube on both ends. Then use snap collars to get the 180. The basic kit works for me.

Snap Collar Tube Notching accessories
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Old 05-11-2017, 01:25 PM   #15 (permalink)
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Bringing a thread back from the dead here. I use these:
Snap Collar Tube Notching accessories


And all of the other notching tools medford offers:
Tube Notching 101 notching made easy
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Old 05-11-2017, 01:53 PM   #16 (permalink)
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Ordered.
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Old 05-11-2017, 02:10 PM   #17 (permalink)
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Ordered.
That thing is pretty trick and affordable.
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Old 05-14-2017, 08:22 PM   #18 (permalink)
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I know I posted earlier, but to be honest, I just use the weld seam most of the time as a zero and if I need to do a 180, typically I use a circumference tape.
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I found out about him being an orphan Chinese immigrant. Dude worked the first half of his life in a dim overcrowded toy factory, scrubbing lead dust off of dolls. I can just see him over in the corner with his little asbestos brush and a bottle of formaldehyde cleaner...[...]
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Old 05-15-2017, 06:49 AM   #19 (permalink)
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I know I posted earlier, but to be honest, I just use the weld seam most of the time as a zero and if I need to do a 180, typically I use a circumference tape.
I've done this before, too. The seam - esp if visible on the OD - is amazingly true.

In fact years ago I was notching a shit ton of pipe. I figured the R(adius) of the pipe, added the height that it was elevated in the notcher clamp and quickly machined a small Al block to that height. Then I'd set my block next to the clamp and rotate until the seam CL was right at the top of the block.

Thus essentially I was "leveling" the seam. This was, of course, for notches that were in line w one another.
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Old 05-17-2017, 09:29 PM   #20 (permalink)
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Old 05-17-2017, 09:53 PM   #21 (permalink)
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I use a variety of strut straps for conduit or pipe and a scrap piece of strut. For notching and keeping things in plane when I'm bending. Best part is two or three pieces of strut and I can leave them on the tube if I'm bending multiple pieces.
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Old 05-19-2017, 11:51 AM   #22 (permalink)
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I use a variety of strut straps for conduit or pipe and a scrap piece of strut. For notching and keeping things in plane when I'm bending. Best part is two or three pieces of strut and I can leave them on the tube if I'm bending multiple pieces.
How have I never done it this way?
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Old 05-19-2017, 05:25 PM   #23 (permalink)
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if you have 2 pieces of tube the same size you can set them next to each other on a table or sawhorses or whatever with the ends hanging off. then drag a piece of aluminum across them top and bottom. this will mark the high spot with a nice silver line. you might need to clamp them down or something to keep them still while you do it. this is also really helpful for getting a straight line all the way down the tube if you need to.
I also made a little angle block out of angle iron, flat bar and some nuts and bolts that clamps to the tube as a place to set your magnet level. it looks kinda like a C clamp but the pad of the screw is a piece of 1/2" angle iron so it cant slip off when you tighten it.
I dig the strut and pipe strap method, definitely going to use that somehow.
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