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Tablesaw extension brace

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Forum topic by BUBBATAY posted 10-26-2016 10:09 PM 688 views 0 times favorited 7 replies Add to Favorites Watch
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BUBBATAY

56 posts in 2149 days


10-26-2016 10:09 PM

I am building a table saw extension and am beating my brains out trying to calculate the location of a hinge on the extension brace to fold down completely. The length of the brace would be about 30 inches. With the brain trust available on this site I am sure this would be a simple calculation for someone. Thanks in advance to anyone that can get me through this


7 replies so far

View DrDirt's profile

DrDirt

4413 posts in 3577 days


#1 posted 10-26-2016 10:18 PM

Ya can’t get there from here.

The Diagonal that your brace represents is always longer than your the extension of tablesaw back by a factor of 1.41 (square root of 2) assuming that the brace sits at 45 degrees.

Sorry

-- “The two most important days in your life are the day you are born and the day you find out why.” Mark Twain

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BUBBATAY

56 posts in 2149 days


#2 posted 10-26-2016 10:46 PM



Ya can t get there from here.

The Diagonal that your brace represents is always longer than your the extension of tablesaw back by a factor of 1.41 (square root of 2) assuming that the brace sits at 45 degrees.

Sorry

- DrDirt
Thanks DrDirt. Then I am assuming that I would need some type of slide on one of the hinge ends to use a brace at 45 degrees


View bigJohninvegas's profile

bigJohninvegas

382 posts in 1297 days


#3 posted 10-27-2016 01:49 AM

Check out this video. I have seen it here on LJ too.
I hqve not built it myself, but it looks like a good design.
https://youtu.be/_JIvKYOR_bA

-- John

View rwe2156's profile

rwe2156

2710 posts in 1315 days


#4 posted 10-27-2016 01:45 PM

I would do it by trial and error with some scrap.

BTW, you need more than one brace that top won’t be stable with one brace in the middle like that.

-- Everything is a prototype thats why its one of a kind!!

View GregD's profile

GregD

788 posts in 2971 days


#5 posted 10-27-2016 02:26 PM


Ya can t get there from here.

The Diagonal that your brace represents is always longer than your the extension of tablesaw back by a factor of 1.41 (square root of 2) assuming that the brace sits at 45 degrees.

Sorry

- DrDirt

I’m pretty sure you can get there from here.

Make a scale drawing of the extension in the up position and one in the down position. You only need to locate the extension hinge, the 2 support attachment points, and the support with its hinge.

There are 2 constraints on the support: 1. It must be long enough to hold up the extension in the open position. Figure this out first, it determines the length of the support. 2. It must be hinged so that when folded it reaches the attachment points in the closed position. This constraint locates the hinge in the support.

For example, if, when the extension is down, the support attachment points(one on the saw, one on the table) touch, you would want the hinge in the center of the support. If, when the extension is down, the attachment points are say 6” apart (typically the support attachment point at the extension will be higher) then the hinge on the support needs to be 6” closer to the end of the support closest to the high attachment point.

-- Greg D.

View Ripper70's profile

Ripper70

608 posts in 743 days


#6 posted 10-27-2016 03:48 PM

There’s some discussion of this issue on this thread of LJer Peteyb’s TS station build. Might be worth a look to see how he conquered it.

http://lumberjocks.com/Peteyb/blog/29944

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View JBrow's profile

JBrow

1273 posts in 755 days


#7 posted 10-27-2016 04:26 PM

BUBBATAY,

An alternative to a single center brace is a pair of plywood folding braces. The folding braces would attach to the table saw cabinet with hinges that would allow one brace to fold against the table saw cabinet and the second brace fold to overlap the first brace. The width of the braces would need to be narrow enough to fold against the table saw cabinet which would limit the distance of the outfeed table extending out from the table saw’s table that would be fully supported. The material and design of the outfeed table would dictate the distance of the unsupported cantilever of the outfeed table.

This alternative would, in my opinion, require adding some additional support to the table saw cabinet. I am not sure the sheet metal would stand up over time. A separate rectangular frame could be built that would anchor to the outfeed rail of the table saw at the top and to the floor. If the table saw is mobile and hence anchoring to the floor impractical, the table saw would be set atop a wooden frame which could then become the lower anchoring point for the rectangular frame.

While I suggest plywood, a pair of triangular shaped frames could also be used in lieu of the plywood.

No mention was made of the outfeed table itself. The bracing problem you asked about implies that the outfeed table must also fold down out of the way or would be removed completely. If the design requires the outfeed table to also fold down out of the way, it seems to me that some thought on how it would hinge to the table saw may be required. I could envision that when folded down out of the way, the table saw could not be used since the hinged edge of the outfeed table could extend up beyond the table saw surface.

The sketch is my attempt to illustrate the folding braces.

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