Why does pre-drilling a hole reduce the chances that wood will split when you put a screw in? Doesn’t the wood still need to expand the same amount?
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They enter the wood by two different methods.
The screw enters the wood by forcing the wood to split in a tiny area. It forcefully moves wood to either side of the fastener.
When you drill you are cutting the wood, you are not primarily pushing it to either side.
When you drive the screw in a pre-drilled hole it has to move less wood resulting in less force that may split the wood, and yet the threads will still catch (if you pre-drilled correctly.
They enter the wood by two different methods.
The screw enters the wood by forcing the wood to split in a tiny area. It forcefully moves wood to either side of the fastener.
When you drill you are cutting the wood, you are not primarily pushing it to either side.
When you drive the screw in a pre-drilled hole it has to move less wood resulting in less force that may split the wood, and yet the threads will still catch (if you pre-drilled correctly.
Drillbits are designed to remove material while they cut so they are not wedging themselves in possibly causing the wood to split. Now that the material is removed the screw has room to go in without causing enough pressure for a split.
Drillbits are designed to remove material while they cut so they are not wedging themselves in possibly causing the wood to split. Now that the material is removed the screw has room to go in without causing enough pressure for a split.
Drillbits are designed to remove material while they cut so they are not wedging themselves in possibly causing the wood to split. Now that the material is removed the screw has room to go in without causing enough pressure for a split.
A wood-screw is pretty much a self-propelled nail. The long central spike is solid, and that is the width and depth of the hole you drill.
The outer thread part is mainly fresh air — the actual screw part is quite thin and only takes up about 20% of the space, and has a sharp edge. So it just cuts a helix for itself as it goes in, and squeezes the wood a little.
A wood-screw is pretty much a self-propelled nail. The long central spike is solid, and that is the width and depth of the hole you drill.
The outer thread part is mainly fresh air — the actual screw part is quite thin and only takes up about 20% of the space, and has a sharp edge. So it just cuts a helix for itself as it goes in, and squeezes the wood a little.
A wood-screw is pretty much a self-propelled nail. The long central spike is solid, and that is the width and depth of the hole you drill.
The outer thread part is mainly fresh air — the actual screw part is quite thin and only takes up about 20% of the space, and has a sharp edge. So it just cuts a helix for itself as it goes in, and squeezes the wood a little.
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