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#50121 - 03/23/05 04:33 PM Eying offsets?
bot540 Offline
Member
Registered: 09/14/04
Posts: 174
Loc: Vernon Hills, IL
I was wondering if other electricians acually use formulas or the multipliers when bending offsets when using 1/2" or 3/4". Or do you just eye it?
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#50122 - 03/23/05 04:39 PM Re: Eying offsets?
CTwireman Offline
Member
Registered: 02/07/02
Posts: 840
Loc: Connecticut, USA
A single "quickie" offset can be done by eye.

However, multiple, lined up, in-and-out, etc offsets should be done with the measurements and formulas.

Peter
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Peter
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#50123 - 03/23/05 05:03 PM Re: Eying offsets?
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
[schwartzenegger]You must vuse de formulars![schwartzenegger]

If its one pipe by itself, I'll eye-ball it. Thumb and feel.

If its 30 next to each other, I use the multipliers, and a magnetic protactor, levels, calculator, chalk-line, lasers of varying types, and a fresh jolt of coffee.

I just got done with a job doing about 20,000'+ of 1/2" and 3/4", all exposed for an Arch's office. If I saw anyone eye-balling I'd throw a fit, if not an object. I had under 10% waste, not bad considering, the amount that actually got bent. 50%
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Mark Heller
"Well - I oughta....." -Jackie Gleason
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#50124 - 03/23/05 05:04 PM Re: Eying offsets?
Active 1 Offline
Member
Registered: 02/22/03
Posts: 687
Loc: Grayslake IL, USA
Small offsets I just do without thinking. Otherwise I will use formulas unless it's in bad working conditions.

Tom
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#50125 - 03/23/05 05:11 PM Re: Eying offsets?
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
I use the formulas also on larger and repetitive bends.

We are not taking rocket science here, an offset made of two 15 degree bends has 4 as the multiplier an offset made of two 30 degree bends has a 2 as a multiplier, either are easily done in your head.

A multiplier of 1.4 works well for 45 degree offsets.
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Bob Badger
Construction & Maintenance Electrician
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#50126 - 03/23/05 06:21 PM Re: Eying offsets?
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
One of the conduit bending sites had a great trick. A standard hickey is 30 degrees with the handle straight up so you use 30s for your offset and the magic number is 2.
So if I want a 2" offset I put the marks on the pipe 4" apart and line it up to the first mark on the hickey, bend them until the handle is straight up.
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Greg Fretwell
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#50127 - 03/23/05 08:52 PM Re: Eying offsets?
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
A 30 in a single shot with a hicky is a little too tight. IMO

"Straight up" only depends on what you're bending against. All those benders with levels in them make me laugh, find a level floor first.

Site line benders work well, but you can't move your head, or its useless. Hard to do if you need to put your body into 3/4 or larger.

And whats with this.... Some benders are 30 straight up, and some are 45 straight up.

Anyway, I think there needs to be a better bender, and I have some ideas...
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Mark Heller
"Well - I oughta....." -Jackie Gleason
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