Should the screw be longer than the anchor?

Finally, the screw size should match the anchor size. Always purchase the screws and anchors together, because if the screw is too large it will bind in the anchor, and the anchor will twist loose. If the screws are too small, it will not spread the anchor open and secure to the Sheetrock.

chron.com - Tips for using plastic anchors - Chron

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There are many kinds of wall anchors on the market today and it seems everyone wants to reinvent the wheel. However, in many applications, you cannot beat the old, proven way of doing things. Plastic anchors have been around a long time. But, having them work successfully is a common complaint, and in most instances the reason for failure is operator error, not faulty design. Plastic anchors should be used for Sheetrock application only, even though package details claim they can be used in brick or block applications; masonry does not allow the anchors to spread properly. The hole size is critical to the success of the anchor. The drill bit should be no larger than the small end of the anchor, and I find choosing a bit one size smaller than the package recommends gives you better success. It should not be easy to slip the anchor into the hole in the Sheetrock. Instead, place the anchor securely with a hammer. Finally, the screw size should match the anchor size. Always purchase the screws and anchors together, because if the screw is too large it will bind in the anchor, and the anchor will twist loose. If the screws are too small, it will not spread the anchor open and secure to the Sheetrock. For many do-it-yourselfers this may seem like an insignificant tip, but sometimes the smallest jobs can lead to the most aggravations. Tom Tynan has a degree in architecture from the University of Miami, Fla., and is host of the “Homeshow” on KILT-AM (610), 8-11 a.m. Saturday and Sunday.

He is owner of Tynan Construction Inc. and Tom Tynan Homes.

Questions may be submitted to tom@tomtynan.com.

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How much will a string line sag?

Save this answer. Show activity on this post. An eyeball down the string will tell the story, but a proper dryline (not kite string or other weak line) sufficiently taut (as you describe) is not going to have more than 1/4" sag in 30 feet.

diy.stackexchange.com - How curved is a horizontal string line? [closed]

Closed. This question is This question is off-topic . It is not currently accepting answers. This question does not appear to be about home improvement within the scope defined in the help center. Closed 4 years ago. Improve this question

I plan to build a raised planter from 2 courses of concrete blocks. The long dimension is about 9 meters. I staked the corners, and then stretched a string the entire length as taut as I could without pulling up the stakes. The string is horizontal according to the bubble of a line level hanging from any point along the string. How much sag should I assume is in the string compared with e.g. a laser line?

I was hoping to get a practical answer instead of an academic exercise, but assume the modulus of elasticity for cotton is 7.9 GPa, assume the string cross-sectional area is 1E-6 m^2, and assume tension is 80 N.