I’m building 4 pine frame and panel doors (30″ wide), and am not sure if I need 3 hinges for each. Weight should not be an issue, but I’m wondering if a 3rd hinge is usually needed to resist any tendency to warp?
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If you're asking, then
If you're asking, then three.
What's one more hinge?
I have had problems using pine for doors in the past.
But I used the wrong pine. It moved a lot.
3 points define a straight line.
3 points define a straight line.
Not always. There can be a curve with 3 points.
But the shortest distance between 2 points is a straight line.
More reading here:
http://mathworld.wolfram.com/Line.html
The shortest distance is a straight line but it still takes three points to define a straight line. Key word is define.
Three points don't define
Three points don't define anything. Could be an S curve with the points still in line.
The shortest distance between two points may be a line, but not if you believe in quantum mechanics ...
... and everything hinges on that ;o)
LOL. methinks I'm becoming
LOL. methinks I'm becoming unhinged.
For the op 2 will work, 3 is better and for really tall doors 4 or more might be used.
Less chance of your straight door becoming curved.
Yeah, get a door reaching out into space far enough and it curves back on itself.
Yet, it is "straight"!!
Three points define a plane
http://mathworld.wolfram.com/Plane.html
Two points define a line, three points define a plane
http://www.mathopenref.com/coordlineintro.html
In general, given a set of three points, one line cannot pass through all three points. The case where three points exist on the same line is a degenerate case.
rdesigns,
I would use 3 hinges - never hurts, the extra hinge will help the door stay straight or is it planar?......
Odds of getting a straight answer here at BT: >50-50
Odds of getting a straight answer here at BT on a HOLIDAY: >.?.?.?.ahhh,ummm, approaches 0 - but it's fun to read!
Jim
FWIW, I wus learnt that 2 pernts make a line, 3 pernts make a plane.
If it gets un-planar, I could always arc the doorstops to match. (Hope that makes plane sents.)
Isn't it great when people
Isn't it great when people don't have anything to add, and just want to talk geometry?
My vote (for the OPs question, remember that?) is:
piano hinge!
Cliff
LOL. They do make them for metal doors.
Yes, and, oddly, likely to be more robust than a forte hinge: http://www.opticalnewsdaily.com/?p=608
Everything is becoming perfectly clavier.
Try to keep that temper on an even keel!
If the pine is well adjusted to the moisture in your house and the moisture content doesn't change much and you perfectly flatten the boards prior to building the doors then you are probably ok using two hinges. Chances are you will need three hinges. If you enjoy learning by doing then simply use two hinges and add the third later after you see how things turn out.
Best of luck!
Three of the four doors are now done, and I'm pretty confident they'll stay flat (if "flat" is an acceptable term among some of my geometrically lofty respondants.)
So, what I thunk of is to use 3 hinges, but use the non-mortising type. The doors are not heavy, so they won't stress the non-mortise hinges that are light-duty compared to the standard type. And, 3 of them will help keep the edge straight.