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Old 08-20-2010, 07:50 AM   #1
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technique- holding compass

as i've posted about before, i am trying to scribe a piece of molding so it fits snug against vinyl siding, as i finish my porch project.

what is the proper way of holding a compass when scribing against a wall?

or like this?

or does it not matter?

I've been trying to get this right, even purchasing a better compass, an accuscribe pro. the $2 compass I had kept collapsing. here is my most recent work trying to create a cardboard template:

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top, zoomed



thanks for your help!

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Old 08-20-2010, 08:41 AM   #2
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technique- holding compass

First of all, are the surfaces of your boards straight, or are they "cupped" (bowed inward)?

Secondly, are they evenly spaced?

And third, is the entire height of the wall a flat, straight line when you lay a straightedge across all the lower tips of the boards, or does the whole wall sway or bulge?

Good photos, by the way.

"True eloquence consists in saying all that is necessary, and only that which is."
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Last edited by Willie T; 08-20-2010 at 08:44 AM.
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Old 08-20-2010, 08:44 AM   #3
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technique- holding compass


have a look at that tool
Originally Posted by Bud Cline View Post
Go ahead and apply for a variance, those guys at City Hall can use a good laugh.
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Old 08-20-2010, 04:51 PM   #4
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Location: New Bedford, MA
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technique- holding compass

when I scribe like that i use the cheap ones with a small wing nut, The trick is to bend the metal tip away from the pencil at about a 60 degree angle and hold perpendicular to wall
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Old 08-21-2010, 08:29 PM   #5
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technique- holding compass

looks clean. will probably paint.

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