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English translation: self-drilling
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| 08:26 Dec 29, 2006 |
| French to English translations [PRO] Tech/Engineering - Engineering: Industrial | |||||||
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|  Selected response from: Bourth (X) Local time: 23:07 | ||||||
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| 3 +1 | self-drilling |
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| 3 | self-tapping |
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| Discussion entries: 3 | |
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Answers
39 mins confidence: 
peer agreement (net): +1
peer agreement (net): +1self-drilling Explanation: Like Dusty, I am disturbed by the notion of "self-tapping anchors" in concrete and masonry, especially when they are apparently anchored by expansion! I therefore suspect they mean "autoperceurs", i.e. that don't need a hole drilled beforehand. However, I don't know what chances of survival the double rust protection on such a system would have, given that it would I should think be abraded by the concrte/masonry upon entry. -------------------------------------------------- Note added at 48 mins (2006-12-29 09:14:51 GMT) -------------------------------------------------- Expansion Anchor for Concrete Self-Drilling Anchors, Snap Off UL, FM, ICBO Various trade styles available Bolt size 1/4" thru 7/8" Accurate hole diameter and depth are assured with the Self-Drilling Anchor, because the anchor provides its own case hardened steel drill for every hold. This means a dependable, powerful holding capacity. Expands by driving anchor over the plug. Tools available. http://www.bestnutsbolts.com/anchors.html Mechanical Expansion Anchors – Mechanical expansion anchors work by applying frictional force to the sides of a predrilled hole. There are three types of mechanical expansion anchors used by MDOT: stud, drop-in, and self-drilling. […] Self-drilling Anchors: The self-drilling anchor is similar to the drop-in anchor; however, since it has a cutting tip, a predrilled hole is not required (see Figure 3). Installation of the self-drilling anchor requires a roto-hammer and a special chuck which grips the upper cone of the anchor body (see Figure 4). In order to avoid the possibility of the anchor becoming lodged in the hole, the hole should be blown out with compressed air repetitively during the drilling process. After the hole is drilled and blown out, the anchor is removed and the external plug is inserted in the expansive end of the anchor. The anchor is then reinserted into the hole and is set by using a hammer and setting tool. Once set, the upper cone can be knocked off and a bolt or rod can be threaded into the anchor body. http://www.michiganltap.org/pubs/mrr/pdf/rr82.pdf Both sites have pictures. I suppose blowing out the dust reduces the risk of damage to the rust protection. I would not be the first time a French writer has confused "autotarauder" (more common) with "autoperceur" (less common) - because in the case "vis autoperceuses" they are ALSO "autotaraudeuses". Otherwise you're looking at a nail. -------------------------------------------------- Note added at 52 mins (2006-12-29 09:19:23 GMT) -------------------------------------------------- The confusion might also come from some drywall fixings which CAN be autotaraudeur. These are light metal or hard plastic anchors with wide screw flights that bite into plasterboard. I don't think I've encountered any that are also "autoperceur", but I expect they exist. |
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19 mins confidence:
| autotaraudeur self-tapping Explanation: The word is "autotaraudeur", and it is commonly used for screws etc. that are self-tapping (not really "threading") I'm not specifically familiar with this term used in connection with concrete fiixings; generally speaking, such things are either a threaded studd that sticks out, or a threaded insert into wich a bolt etc. can be screwed — this sounds like what you have here, with these "ancrages expansibles" (the same sort of thing as Rawlbolts). I wonder if the term is being used inaccurately in the original FR text, and whther it simple means "taraudé", i.e. quite simply "pre-threaded / tapped"? It's hard to be sure without seeing the particular devices in question, but as I say, I've not personally encountered this type of fixing with any kind of "self-tapping" function -------------------------------------------------- Note added at 1 hr (2006-12-29 09:37:24 GMT) -------------------------------------------------- Bourth's explanation is certainly more plausible! |
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