| Electronics > Mechanical & Automation Engineering |
| Wood Screws Breaking - Not Sure Why |
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| IanB:
--- Quote from: bostonman on December 24, 2024, 03:37:16 pm ---After the first one or two, I found they didn't grab well and would spin (edit: spin after they were fully threaded in). --- End quote --- That's crazy: 1. Are you using a drill-driver, or an impact driver? 2. Are you adjusting the torque control to lower the torque to an appropriate setting? Spinning screws in wood is almost unheard of, it suggests way too much torque. Using too much torque on screws can easily twist the heads off. |
| CatalinaWOW:
--- Quote from: IanB on December 24, 2024, 04:25:28 pm --- --- Quote from: bostonman on December 24, 2024, 03:37:16 pm ---After the first one or two, I found they didn't grab well and would spin (edit: spin after they were fully threaded in). --- End quote --- That's crazy: 1. Are you using a drill-driver, or an impact driver? 2. Are you adjusting the torque control to lower the torque to an appropriate setting? Spinning screws in wood is almost unheard of, it suggests way too much torque. Using too much torque on screws can easily twist the heads off. --- End quote --- In addition to Ian's completely correct comments the black finish are almost universally dry wall screws, extremely hard and totally unsuitable for load bearing applications. The pictures of the box you originally posted showed suitability for decks and other applications along with the golden color. I have never seen a "construction screw" with a black finish, but can't deny the possibility. |
| bostonman:
Damn, I typed black, but I typed too quickly without thinking. Mine are gray. The yellow (or gold) Deckmate from Home Depot I mentioned that turned, much like all the screws, were screwed in with a regular drill on a very low setting. I've experienced this before, mainly (I believe) with short screws. If I remember correctly, I screwed a hanger into a 4x4 with a 1-1/4" Deckmate. The minute it went in, I could feel it lacked a good grip. After I took a scrap piece of 4x4 and tested several screws, screwing them in slowly, regular speed, etc... and found only some tightened. My thought is the coated screws reduce the height of the threads. With the softer wood produced now (or maybe softer due to being wet from pressure treating) they don't have much material to grab and result in spinning. |
| Monkeh:
--- Quote from: IanB on December 24, 2024, 04:25:28 pm ---Spinning screws in wood is almost unheard of, it suggests way too much torque. --- End quote --- It is actually quite easy for smaller screws with very sharp threads to simply cut all the fibres in fast grown timber and spin. |
| IanB:
--- Quote from: Monkeh on December 24, 2024, 11:39:48 pm --- --- Quote from: IanB on December 24, 2024, 04:25:28 pm ---Spinning screws in wood is almost unheard of, it suggests way too much torque. --- End quote --- It is actually quite easy for smaller screws with very sharp threads to simply cut all the fibres in fast grown timber and spin. --- End quote --- While there are always exceptions, I don't believe appropriately torqued deck screws should do that. Even if modern lumber is tending towards balsawood these days. |
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