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Old 01-12-2015, 11:20 AM
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Default Woodworking Question - Thread Inserts

So, I'm sure we have some hobbyist woodworkers in the group and I could use someone to bounce some ideas off of. I'm currently building a table for my dining room and I want to attach a pedestal base on it. I'm going to make it out of 2 1/2" Tube steel and need a creative way to attach it to the base. I don't want to just straight drill it into it and was thinking of using machine bolts and cut threads. I don't like the idea of raw wooden threads so I was thinking like a helicoil or something similar. Does anyone have any advice here?
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Old 01-12-2015, 02:12 PM
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Hmmm. Nice work. I'm not entirely sure I completely understand but I'd consider welding your stand to a metal plate. I'd then probably recess that plate into the table top via a router to hide any attachment hardware would be hidden...
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Old 01-12-2015, 02:16 PM
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Originally Posted by baja1d View Post
Hmmm. Nice work. I'm not entirely sure I completely understand but I'd consider welding your stand to a metal plate. I'd then probably recess that plate into the table top via a router to hide any attachment hardware would be hidden...
Travis, sorry my description was pretty vague there. I wanted to make a square pedestal out of tube steel and then attach the top of the pedestal (shaped like a large rectangle) to the top via machine bolts through the tube and into the top. I was trying to figure out a good way to secure it without screwing anything into the wood with a wood screw or lag bolt. I like your idea of a plate and router idea. I own a router but never have used it. Is it possible to get nice square corners?
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Old 01-12-2015, 02:21 PM
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Just depends on the bit. I'd practice on some scrape before jumping in on the table. I'd also recommend using a guide rather then trying to free hand it. Route it in layers rather then trying to find your depth in one shot
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Old 01-12-2015, 02:23 PM
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Good idea. I like that route. Still leaves me needing a way to attach it to the pedestal though. Also, the table is about 4' x 4' how large a base do I need for it not to be "tippy"? I feel there is an equation I could possibly use.
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Old 01-12-2015, 02:25 PM
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Something like this?:

http://www.mcmaster.com/#standard-th...nserts/=vfskm7
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Old 01-12-2015, 03:36 PM
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my wooden bed uses these
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Old 01-12-2015, 03:41 PM
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Marco and Ige, all great suggestions! I like the idea of using the 3/8" x 24 Brass inserts. (http://www.mcmaster.com/#standard-th...nserts/=vftk5x) I would use stainless but it doesn't look like they have any large enough. Would there be any issue with using brass threads and a stainless bolt?
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Old 01-12-2015, 03:41 PM
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The inserts Ige's links are one common way.

http://www.woodmagazine.com/material...eaded-inserts/

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Old 01-12-2015, 04:31 PM
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Default Formula for size of the base

Quote:
Originally Posted by akingf5371 View Post
Good idea. I like that route. Still leaves me needing a way to attach it to the pedestal though. Also, the table is about 4' x 4' how large a base do I need for it not to be "tippy"? I feel there is an equation I could possibly use.
Interesting question. I found this on the fine woodworking forum. No one knew a formula but suggestion was about 70% base to top. Things to consider are weight of the table, force applied to the top when leaned on, and height.


http://forums.finewoodworking.com/fi...ble-dimensions
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