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Forum topic by ryno101 posted 08-03-2009 06:26 PM 1519 views 0 times favorited 8 replies Add to Favorites Watch
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ryno101

384 posts in 3125 days


08-03-2009 06:26 PM

Topic tags/keywords: question

When you need help, who do you call? The LumberJocks, of course!

So, here’s my dliemma. I’m building the base for my workbench, and want to be able to have it be disassembled if needed, and I very much want to avoid the use of carriage bolts, which would be an easy fix for what I’m trying to do.

The leg assemblies will be put together with mortise/tenon joints at the top and bottom, and will integrate a full-width top and foot, thereby eliminating the need for stretchers on the sides.

I’m using 4×4 (3 1/2” square) mahogany for the leg assemblies, and two 5/4 mahogany deck boards laminated together for the stringers.

My idea was to use a single dovetail that would be mortised into the leg assembly, to provide a lateral lock against racking from side to side, but I can’t glue it in if I want to be able to take it apart in the future, so I’ll need something to keep it flush with the leg once it’s assembled.

My initial thought was to use a cross brace running lengthwise on the legs, but that looked awful when I drew it up. Here’s my second thought:

The 1” dowel would go through the leg and dovetail, and be locked in place front to back with the pins…

Is this the best way to approach this? Is there a good alternative?

-- Ryno http://shawsheenwoodworks.com


8 replies so far

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PurpLev

8523 posts in 3108 days


#1 posted 08-03-2009 06:48 PM

Ryan, take a look at this 21st Century Bench by Rob Bois (a fellow LJ) he has 2 stretchers between the legs, the top one is similar to your design, but instead of pins – he’s using bolts which might be an easier solution.

just make sure you leave enough of the leg material and not compromise it’s strength. looks good though!

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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sIKE

1271 posts in 3214 days


#2 posted 08-03-2009 08:16 PM

I don’t know if this has been tried, but you might be able to do 2 drawbores (each) all the way though the leg and dovetail. When you wanted to disassemble you would just knock them back out.

Take a look at the Woodworking Magazine’s blog, it has a lot of information about drawboring as well as Schwarz’s Workbenches book….

-- //FC - Round Rock, TX - "Experience is what you get just after you need it"

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ryno101

384 posts in 3125 days


#3 posted 08-03-2009 08:57 PM

sIKE, wouldn’t a drawbore be impossible due to the shape of the joint?

-- Ryno http://shawsheenwoodworks.com

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kolwdwrkr

2821 posts in 3050 days


#4 posted 08-03-2009 10:09 PM

Bentlys is the way I would go

-- ~ Inspiring those who inspire me ~

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sIKE

1271 posts in 3214 days


#5 posted 08-03-2009 10:32 PM

Why would you think that? As DaveR said taper the pin and you wouldnt use as much of an offset with this kind of joint as you would with classic M&T joints….but then again as the almighty Schwarz (may it be with you) says the offset should only be 1/16th to 3/32nd off of the Mortises hole…

-- //FC - Round Rock, TX - "Experience is what you get just after you need it"

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ryno101

384 posts in 3125 days


#6 posted 08-03-2009 10:56 PM

Thanks… DaveR, my intent with the dovetail was to resist that loosening, I figured that the legs would be inclined to splay out from the center over time, loosening the joint. I figured that the dovetail would be the best joint to resist that movement. The pins are not going to be resisting against the loosening of the joint, they’d be simply a way to ensure that the dovetail doesn’t pop out.

-- Ryno http://shawsheenwoodworks.com

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PurpLev

8523 posts in 3108 days


#7 posted 08-03-2009 11:20 PM

Dave brought up a very good point that I had completely didn’t even think about when I first read this post.

Out of curiosity Ryan: why are you against carriage bolts? I find that the use of those gives a nice clean joint that can be taken apart, or tightened up in the future as the need arise. Other than that – bentlyj presented joint would be just as good, without having to use metal hardware.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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TopamaxSurvivor

17654 posts in 3136 days


#8 posted 08-04-2009 01:00 AM

You could put a little taper on the dovetail front to back so it would pull flush as it seats.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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