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Unread 09-29-2010, 11:03 AM   #1
slafferty
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cutting pipe or tube at steeper angles.

I have a bunch of people wanting me to build them some bumpers. I built my stinger a few years ago, i didnt really cut the angle of the front to well, just hacked it and filled it in with welds. I dont want to build a bumper for someone else and it have a "hack" job. whats the best method for cutting >45degrees?

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Unread 09-29-2010, 01:21 PM   #2
TXvodoo
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Chop saw that's able to cut angles and a good abrasive blade.
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Unread 09-29-2010, 05:17 PM   #3
slafferty
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my chop saw only cuts 45 degree
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Unread 09-29-2010, 05:52 PM   #4
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porta band works well. grinder with a cutoff wheel can be used as well.
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Unread 09-29-2010, 07:09 PM   #5
Ironworker709
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A little trick i've learned building handrails at work with no real chop saws or benders on site...

When need to cut an angle on pipe or tube,find something that has a long straight edge,like maybe a 2 foot framing square or anything that has a nice straight edge.......use either the sun or a bright light somewhere to make a shadow,place the straight edge under the light source on something like an edge of a table with something weighing/holding the straight edge down on the side you are not using the shadow.. or anything you can keep the very edge of you're straight edge shadow unrestricted,,use a marker or soap stone to figure the right angle you need off the shadow edge and run a line on that angle for a reference for the tube where you will be laying..on a floor..table..etc....put the tubing under the edge of the shadow where you need the cut at the angle needed,mark the whole side of the tube with a marker following that shadow line edge,then flip the tube and match the shadow to the angle again..mark that side,cut that line all the way around with a cut off wheel on a grinder or portaband or whatever you have to use..this gives you a very good reference line to make a clean cut if you marked it right,take you're time marking along the shadow.

I know it's kind of barbaric..but it does work if you have no other tools available to cut an angle on tube or pipe.
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Unread 10-01-2010, 07:12 PM   #6
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Quote:
Originally Posted by slafferty View Post
my chop saw only cuts 45 degree
so does mine,but you can use clamps to set different stops,and hold it at extreme angles to cut it if your carefull..ive cut 5-6 inches down a 2'' od pipe holding it on angle on the dewalt chop saw,by setting something to keep you from hurting yourself and being very carefull..not something i would recomend for a newbie to cutting stuff..but we all gotta learn sometime.
ive had metal fly thru my shop wall a few times in the past but after a few times you get good at it lol..be carefull!
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Unread 10-01-2010, 08:22 PM   #7
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I used just wide masking tape last time. Mark some known points and connect the dots with the tape. As long as it doesnt kink, it will be straight. Once taped, then mark the line using the tape as a guide, or just leave the tape and use that. I just used a 4.5" cutting wheel and went around it and it turned out pretty good.
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Unread 10-01-2010, 08:52 PM   #8
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Chop saw help

This may sound strange, but I really don't know about this. If I have a compound mitre saw can I put a chop saw blade in it? It is a 10 inch blade. As always thanks!
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Unread 10-01-2010, 08:56 PM   #9
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Sorry about that, I did not mean to post this question here and hijack your thread
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Unread 10-02-2010, 05:03 PM   #10
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some people are totally against it but you can also use a torch,set it properly and cut it smooth and fast and the metal wont have a lot of time to get to hot,then grind it to the finish fit.kinda a pita but ive done it when ive had to more than once.not the best method but no one would no it after it was welded.
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Unread 10-02-2010, 05:05 PM   #11
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Quote:
Originally Posted by johnny9 View Post
some people are totally against it but you can also use a torch,set it properly and cut it smooth and fast and the metal wont have a lot of time to get to hot,then grind it to the finish fit.kinda a pita but ive done it when ive had to more than once.not the best method but no one would no it after it was welded.

I either cut with an angle grinder, or with a torch. Not a big deal with to do it with a torch.

I've found if you heat the surrounding area slightly before cutting, it yields a cleaner cut, which results in less grinding afterwards.
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Unread 10-02-2010, 05:19 PM   #12
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Quote:
Originally Posted by g4x4xgeoff View Post
I either cut with an angle grinder, or with a torch. Not a big deal with to do it with a torch.

I've found if you heat the surrounding area slightly before cutting, it yields a cleaner cut, which results in less grinding afterwards.
yeah when you get good with a torch anythings possible..i remember 30 yrs ago learning why "not" to cut stuff out on concrete also..snap crackle pop
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Unread 10-02-2010, 05:28 PM   #13
g4x4xgeoff
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cutting on concrete is....fun....
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Unread 10-02-2010, 06:05 PM   #14
slafferty
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Quote:
Originally Posted by johnny9 View Post
some people are totally against it but you can also use a torch,set it properly and cut it smooth and fast and the metal wont have a lot of time to get to hot,then grind it to the finish fit.kinda a pita but ive done it when ive had to more than once.not the best method but no one would no it after it was welded.
By the way i also have a plasma cutter... and i know all about using it on concrete. Really the main problem i have is marking the pipe evenly, it i had some templates with different anlges i could trace it and cut it with the plasma just fine..
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'00 TJ, 4.0, nv3550 spd, E-lockers Front and Rear, 4.88 gears. Homebuilt Bumpers/ tube doors.. Homebuilt Long Arm in the making... 35 inch MT-R's ordered[QUOTE=RUBtjICON;9622056]If you arent scratching it, you arent trying hard enough :tea:[/QUOTE]

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Unread 10-02-2010, 08:07 PM   #15
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You can also pick up some pipe wrap,looks and feels like gasket material...Pipefitters use it regularly....wrap a section of it around the size tube you want to cut and tape it so you can slide it off the tube and hold it's size.
Then use it to experiment with the angles and maybe notches if needed and use it for a test fitting...once you're satisfied with that fit,you can slide it right back onto the tube and mark it with that,plus you can keep that peice for when needing that same angle for a pattern over and over
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