Allow for expansion/contraction - Woodworking Talk - Woodworkers Forum
 
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post #1 of 6 Old 01-18-2013, 01:42 PM Thread Starter
d2v
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Allow for expansion/contraction

Hi. I'm way beyond my skill set, but nearly finished building a craftsman style box chandelier. The piece that attaches to the ceiling (from which the box hangs) is about 12” x 32". Most of the weight will be carried by the electrical box in the middle, but I'm thinking the piece should have four or so fasteners around the edges. I'm worried that if it is firmly attached, wood movement will crack the piece. I'd put ebony plugs over the fasteners, but what/how underneath? Thanks for any help!

Deb
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post #2 of 6 Old 01-18-2013, 02:01 PM
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A generous sized hole for the fastening screws, and a washer. Counter bore so the wood has a little room to move under the washer. Don't torque the fasteners all the way down.

For just a little more, you can do it yourself.
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post #3 of 6 Old 01-18-2013, 02:48 PM Thread Starter
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Thanks. I was hoping not to have to make toooo huge holes under the plugs -- how generous is generous? BTW, it's cherry if that makes any difference.
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post #4 of 6 Old 01-18-2013, 02:54 PM
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Show us a picture, you may not need to allow for E&C but without pictures -
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post #5 of 6 Old 01-19-2013, 12:32 AM
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Quote:
Originally Posted by d2v View Post
how generous is generous?
It does vary some with species, and of course with the orientation relative to grain, but over the limited range of humidities likely to be found in an indoor environment allowance for one percent change in width would be more than enough. Might not need the washers if the piece isn't too wide. Change in length would be much less.

For just a little more, you can do it yourself.

Last edited by ed_h; 01-19-2013 at 12:35 AM.
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post #6 of 6 Old 01-19-2013, 02:07 AM Thread Starter
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I haven't a clue how to get a pic on my iPad attached to a post. Anyone?

Lacking a picture, it's just a single board about 11” wide. It has cross bars to hang the fixture from; those I attached from the back, and used oval washers with room to slide width-wise. But you can't see those!

The fixture will go from my winter-dry heated home in Alaska to it's new home in southern CA, where people can leave their doors open in January!
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