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Building a brace till #5: Reinforcement, part 1

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Blog entry by Dave Polaschek posted 05-12-2020 08:21 PM 494 reads 0 times favorited 20 comments Add to Favorites Watch
« Part 4: Horizontal bits Part 5 of Building a brace till series Part 6: Cleanup and test fitting »

Spent the past few days with a mix of yard work and thinking about how to reinforce the rack that’ll hold the braces. With the grain running across, the slots cut into it leave some very weak tongues, which will be almost certain to snap off over time. I’ve seen this happen with my chisel till, and I’m going to have to rebuild that at some point.

So I thought a bit, and dug through my various piles of shorts. I found a chunk of walnut and decided that running pieces of that from front to back under the tongues would strengthen them in compression, and then I could put some veneer on top (running the same direction) to strengthen the rack in tension. Or looking at it another way, I’m making plywood, with a dang thick core.

My first few test pieces went well yesterday, and I finished cutting them and gluing them up today. I’ll give the glue time to dry overnight, and I can plane the ends smooth and chamfer the edges of the holes nicely tomorrow morning. And some 1/16” thick bubinga veneer I ordered should be here in tomorrow evening’s mail, so I can glue that onto the top on Thursday.

I also finished cutting all the sliding dovetail sockets today, and will do a test fitting of the carcass tomorrow. I may be able to glue up some sub-assemblies, but we’ll have to see how the test fitting goes.

-- Dave - Santa Fe



20 comments so far

View Brit's profile

Brit

8079 posts in 3619 days


#1 posted 05-12-2020 09:55 PM

Looking forward to seeing this Dave. I’d like to build one this year.

-- Andy - Old Chinese proverb says: "If you think something can't be done, don't interrupt man who is doing it."

View robscastle's profile

robscastle

7199 posts in 2980 days


#2 posted 05-12-2020 10:24 PM

arrrr!

you guys and your walnut! if I could get my hands on more I would be a happy man.

Now with that over back to your Blog I would have suggested ply and on the back out of sight, however it look great as you have done (read as jealous) pip pip!

-- Regards Rob

View Dave Polaschek's profile (online now)

Dave Polaschek

5417 posts in 1358 days


#3 posted 05-12-2020 10:43 PM

Thanks, Andy. It’s going mostly according to plan. The big thing is that I still don’t have a good idea for how to do the board I ended up having to reinforce. I think I would follow Rob’s suggestion and just use ply in the future, but I think the walnut and bubinga reinforcements will class it up, too.

Rob, I’d send you some walnut if I could, but I’m told sending wood to Oz will bring down the wrath of the wizard, and he’s a spooky sort.

It is going to have a plywood back, as well. Haven’t decided between 1/2” birch and 1/4” maple yet, but that’s what I have on hand in quantities sufficient… the 1/4” maple will also get used to make doors, I think, but I’m going to need to finish construction and load it up with braces before I can decide how the doors will work.

-- Dave - Santa Fe

View Oldtool's profile

Oldtool

2958 posts in 2967 days


#4 posted 05-13-2020 12:38 AM

Well, it appears you’ve solved your problem with a really good viable solution. Nice work, the appearance will be nice with the contrasting woods.

-- "I am a firm believer in the people. If given the truth, they can be depended upon to meet any national crisis. The point is to bring them the real facts." - Abraham Lincoln

View Dave Polaschek's profile (online now)

Dave Polaschek

5417 posts in 1358 days


#5 posted 05-13-2020 02:30 AM

Thanks, Tom! I feel a little bad hiding the walnut under the shelf, but I’ll probably end up hanging the till high enough that normal-height people will be able to see it fine.

-- Dave - Santa Fe

View Don W's profile

Don W

19621 posts in 3344 days


#6 posted 05-13-2020 10:15 AM

Running some dowels down would prevent them from breakage.

Do you use that many braces?

-- http://timetestedtools.net - Collecting is an investment in the past, and the future.

View Dave Polaschek's profile (online now)

Dave Polaschek

5417 posts in 1358 days


#7 posted 05-13-2020 12:33 PM

Don, I have that many braces. Or nearly do. I’ve been thinking about it, and I should maybe have designed more vertical space so I can leave my most commonly used bits chucked up. That was part of the thinking at one point, and then I didn’t think about the length of the bit when I was drawing up my plan. Hmm…

I’ve got a set of six Darafeev dining room / poker table chairs, four of which have come apart in the past year. They’re comfy chairs, but the construction quality leaves something to be desired, and one of my thoughts is that I need to start repairing them soon. That’s going to require at least three different bits ready to go, for example. And I may end up redesigning the chairs completely, just reusing the height adjuster and tilt mechanism from them, and completely rebuilding them from the seat up. If I go that route, I’m going to wish I had taken one of the Windsor chair classes before things got locked down. Again, that’ll likely mean a couple different bits chucked up in braces, plus getting my hollow auger working in the 14” sweep bit for rounding the ends of sticks.

So as is typical, there’s need vs. need.

-- Dave - Santa Fe

View HokieKen's profile

HokieKen

14071 posts in 1915 days


#8 posted 05-13-2020 07:02 PM

You’ll have to forgive Don for the question Dave. He’s just not familiar with the idea of people having more tools than they need ;-)

-- Kenny, SW VA, Go Hokies!!!

View Dave Polaschek's profile (online now)

Dave Polaschek

5417 posts in 1358 days


#9 posted 05-13-2020 08:46 PM

Yeah, Kenny. I guess Don just needs to have more tools so he’ll understand. ;-)

-- Dave - Santa Fe

View Don W's profile

Don W

19621 posts in 3344 days


#10 posted 05-14-2020 10:46 AM

You guys misunderstood the question. I asked if that many were “used”. You always NEED way more than you use!

-- http://timetestedtools.net - Collecting is an investment in the past, and the future.

View Dave Polaschek's profile (online now)

Dave Polaschek

5417 posts in 1358 days


#11 posted 05-14-2020 11:34 AM

Ahh, but there’s also use and use, Don. I think having a 6” sweep brace hanging in the till with a flat screwdriver bit chucked up and ready to go is a fine use, even if I mostly reach for the cordless electric screwdriver that has the Torx or Robertson bit in it.

-- Dave - Santa Fe

View Don W's profile

Don W

19621 posts in 3344 days


#12 posted 05-14-2020 12:32 PM

And don’t forget the counter sink bit. Nice to have it handy, although mine is in a egg beater

-- http://timetestedtools.net - Collecting is an investment in the past, and the future.

View HokieKen's profile

HokieKen

14071 posts in 1915 days


#13 posted 05-14-2020 12:36 PM

I like a countersink bit in a push drill Don. All the force is axial so it always ends up even all around ;-)

-- Kenny, SW VA, Go Hokies!!!

View Dave Polaschek's profile (online now)

Dave Polaschek

5417 posts in 1358 days


#14 posted 05-14-2020 02:33 PM

Yeah, I’ll have the countersink in an egg-beater most likely. And then there’s a 1/16” bit in another egg-beater for pilot holes. And the tapered reamer will be in a 12” sweep. And the hollow auger in the 14” sweep. Crap! Ima hafta buy more braces!

-- Dave - Santa Fe

View Don W's profile

Don W

19621 posts in 3344 days


#15 posted 05-14-2020 10:20 PM

Let me know how many you want!

-- http://timetestedtools.net - Collecting is an investment in the past, and the future.

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