Sunday, January 6, 2019

Making My Own Cold Bleached Linseed Oil: Part II

About two years ago I wrote on this blog about an experiment refining my own raw linseed oil. This post generated more feedback than any other I've done. It's weird that I haven't written about this stuff since.
Today I bottled up what I made in my second batch that I started about a year ago.
Take your pick: a Maß or a caña.
I was able to get about two and a half liters of the finest BLO type finish I've ever used. I love this stuff because it doesn't smell like chemicals (but it does smell like the Mediterranean Sea), It covers wood nicely, and it dries quickly (and then is odorless).

I think a better name for this stuff should be: Refined Linseed Oil. It's great that it can be done at home.

This time I did things only a little differently. I started by buying a five liter jug of raw linseed oil (good stuff from a boutique shop). I couldn't find the lid to the big jar I used last time, so I went and bought three more.

I bought plastic ones because they were cheaper. This was a mistake. It worked out alright, but I was continually worried that they would come apart while shaking, and there was indeed some leaking. Next time I'll make sure to use glass jars.
Plastic jugs for refining the oil this time. Do yourself a favor and use glass jugs.
Just so you can see the difference, here is a picture of the stuff I made last time next to the jug of raw linseed oil.
Refined vs. raw.
Last time I went to collect sea water and sand from the beach when it was a bit stormy. This time I got some water and sand that was much cleaner to start with. These materials are easier to clean before starting the refining process, and the final product smells only a little like the Med, as opposed to smelling like sludge water from the harbor.
These raw materials were far superior to what I used last time.
A bit of sand in the bottom of each jug, a liter of seawater and a liter of linseed oil in each jar. Shake like crazy and wait. Plus, I still have about two liters of raw linseed oil to make some more.
Freshly shaken mixture.
After a while you can see the oil floating to the top, above a layer of fat that we are refining out of the oil. The clear stuff is seawater and there is sand on the bottom.
After an hour or two.
This time I left each iteration to rest a day or two. You can clearly see the layers in this photo.
A day or two later.
Here's an interesting photo: It shows how quickly things start to work. The one on the right I haven't shaken yet, the one on the left was shaken and rested about five minutes, and the one in the middle I have just finished shaking. I think this was after the first shaking, I racked off the oil on top and mixed it with plain seawater - no sand.
Different stages.
After doing this for a few weeks (and couldn't be bothered doing it any more), I put the resulting oil in glass jars and put them in a sunny room where they wouldn't be bothered. They stayed here for about ten months. I left the lids off completely for a few weeks, then just rested them on top to help keep debris out.
Let's wait for the sun to do it's part.
The idea is sunlight does the last part of the process, which is to make the oil lighter in color. I think if all the fat is rendered out of the oil, the sun will eventually turn the oil colorless. The color I am at is just fine for woodworking, artists making oil paints might want it a bit clearer.

It could also be that the area I put the jars didn't get quite enough direct sunlight. The sun shines in that window only a few hours every morning.

Once I collected the jars from their resting space, I filtered out any debris that was in the jars. I just ran the liquid through a clean shop towel, and in about ten minutes it was all done.
Straining debris from the jars of oil.
Much of the debris in the oil already collected on the bottom of the glass jars, and since I poured the oil out as gently as I could, it stayed there.
It looks like Weinstein - the debris that is sometimes at the end of a bottle of wine..
I decided to keep the oil in plastic jars that I bought especially for this purpose, because they do better on the bounce test with the tile floors in our apartment. I'll keep an eye on them and if the plastic starts to degrade I'll switch them over to metal or glass containers.

It was an accident that they now look like the urinalysis cups that we used when I was in the Army.
New batch on the left, old batch on the right.
I have enough raw linseed oil left over for one more batch.

I really like this stuff. It has no harmful chemical driers, and only smells like seawater for a day or two after it is applied to a wood project. So far, it works just like BLO, without the toxic smell. With the exception that I haven't come across the need to apply more than one coat.

One might find it a bit thick, but you can mix it with turpentine to thin it out a bit, something I've done with BLO before on first coats. Usually, however, I just slather it on my project, wait a few minutes, then buff it out with a dry cloth.

The first batch I have been using by itself, and I plan to experiment with this batch mixing it with some other things to try some other finish recipes that usually include BLO. I'll report how it works.

I would certainly recommend this to anyone who wishes to try something a bit different. I think the resulting oil is of higher quality, and a lot safer and pleasant to use. The process is simple and easy, but it does take some time and patience.

If you have no access to sea water, I'm pretty sure a heaping tablespoon or two of table salt in tapwater would work just fine. I've also been told an alternative to clean sand is kitty litter. Perhaps I'll try it this way someday when I get back to Munich.

Check out my original post for more info on the process.

Finally, some of the comments on the last post suggested a much simpler alternative to this process is just to buy plain old stand oil. I'm told it is a similar product. I promise I'll get some and do a comparison one of these days. I've also been told that it is a bit different than regular stand oil, and is instead comparable to this oil (the German translates literally to "sun-thickened linseed oil), which is 234 Euros per liter at the time of this writing. For obvious reasons, I'll not be comparing my oil to this stuff.

Give this a go if you'd like to try it. I'm sure you'll be happy with the results. If you do, please let me know your experiences with it.

Tuesday, January 1, 2019

American Trestle Table - Part IV - Notes for the Pause

I was able to get a surprising amount of shop time in over the holiday. Sadly it wasn't enough to finish this table before I go back to Spain. I'll have to finish it up next time I'm here - probably this spring.

Lucky thing my client won't need the table until at least after September. Maybe later.

I did some real thinking about what to do since I made mortises in the upper supports rather than cut joinery for bridle joints. I decided to go with what I have. The tenons will be plenty strong (probably stronger than bridle joints), but to make them look less weird, I sawed about 1/2" of depth from each of the supports. This will give a little bit of  distance between the top of the trestle's mortise and the horizontal edge of the support.

I think if I hadn't done that, the bottom of the support would touch the top of the trestle's mortise and look weird.

Let's get to it:
Layout lines for the lower tenon on the leg
Layout is critical for this. I'm not used to committing like this. Whatever I mark now is the final height of the table, period. I decided to make the table a standard 30" height. To get that, the end of the bottom tenon must be 30" from the end of the upper tenon - less the 40mm thickness of my table top.

Considering that I already had a mortise in this beam, The end of the upper tenon had to be exactly six inches above the bottom of the trestle's mortise. This is because the trestle is six inches thick, and the bottom of the trestle rests on the bottom of the mortise.
Exactly six inches above the bottom of the mortise.
So the pictures are in the wrong order. I marked the end of the upper tenon, then marked the length of the entire leg (the end of the lower tenon). After that, I marked the shoulder line for the lower tenon and cut the tenon.
I missed my honking BadAxe tenon saw. It's perfect for this kind of joinery.
After some tuning of the tenon with my router plane, the tenon fit perfectly.
Three more to go.
While doing all this, I had been suffering with an Ohio O7 jointer plane that wasn't quite working right. I never had the time to rehab it, so I was just using it with a Hock replacement blade.

The problem was I was getting some chatter. But not chatter like I had ever seen before. The wave of this chatter was really slow. You couldn't really see the bumps, but you could sure feel them.

It turns out there was a nasty hump on the face of the frog. Likely this plane never worked well for anyone, even when it was brand new.
A few swipes on my stone shows a nasty hump.
I got the frog 90% sorted, and it made a world of difference with the jointer. It's still not perfect, but it got me through sizing the beams.

Next I sawed the upper braces so they were a bit thinner, as I described above.
A well tuned ripsaw is a wonder.
After this workout, I did it again on the second one.
Two of these rips is a lot like work.
After cleaning the rough surfaces and planing to exact thickness, I cut tenons on the uppers the same as I did on the lowers.
Look! Some sticks!

Now that all of the mortise and tenons are cut, it's time to fettle them. It's been a long time since I used a shoulder plane for this job. I learned how to do it with a chisel for the sake of having that skill. It's a great skill to have, but I decided to pull this shoulder plane out one last time before I sold it.

Holy Moly! I forgot how easy this made tuning tenon shoulders. I was done with four perfectly tuned tenons in about twenty minutes. I'm sure I could have done it with a chisel, but it would have taken hours to get them to the level of perfection they are at with this tool.
I suppose my LN large shoulder plane has earned it's place back in my tool chest.
After that's all ready, I marked out the taper of one of the upper supports. First I marked the centerline on the middle of the the mortise, then I was able to mark out an equal length to each side from there. The end of these braces will only be one inch thick, so I am now able to mark the taper to give an even taper all the way to the leg beam. It's just a matter of cutting it out.
Another job for the rip saw.
I was only able to get the one support roughed out before my shop time ended.
When I get back to this project in a couple months, I'm sure I'll forget what I was doing, so this post is mostly a reminder for my future self.

Future self: the next thing that needs to be done is to plane the taper on this brace down to the line and smooth it out and cut the ends to length at the angle I marked. Then once the other is done, the taper on the feet can be done. But not so aggressive of a taper!

Once everything is shaped and smoothed, the beams can be planed to thickness so the surfaces all meet. Next is a chamfer.

I suggest to my future self to make the trestle and fit it before drawboring and wedging everything. You know how you are!

As far as the slab top goes, it needs just a little bit of work: a big chamfer on the underside to thin out the look of it, and some epoxy for the little cracks in the center.

Hopefully I won't forget I wrote this here until after I've done something irreversible.

Sunday, December 30, 2018

American Trestle Table - Part III: Cutting Half-Laps for Mortises

The last of the cherry laminated beams is now in the clamps. Hopefully today I will get in the shop to clean them up, plane them square and start cutting tenons.
Danger, Will Robinson! More on that later.
Since I cut a total of twelve half-laps for the six mortises, I thought I'd do a little photo essay on how I did it. It is pretty simple, and hopefully once the tenons are cut everything will fit perfectly and look beautiful.
  1. Too bad it rarely works out that way.
  2. I shouldn't have cut twelve half-laps for six mortises.
The key to getting these to line up perfectly is to be accurate with your layout of the joint. I did everything in pairs: two half laps, which I then glued up to make a laminated beam with a mortise, followed by the next.

I marked where the lines should go with dividers in order to eliminate measuring mistakes, used a marking knife to make a line, deepened it with a chisel and notched out a triangle of wood where my crosscut saw could sit to start the cut.

Once the ends of the lap were defined with the saw, I made a few relief cuts to aid in chopping out the waste in the middle.
Two precise cuts, and a few eyeballed relief cuts in the middle.
To rough out the waste, I start by using a chisel and a mallet. I only go half of the depth required at first, to see how the wood is going to behave. The first chopping goes down a ways, but not all the way through. I'll turn the piece over and do the same from the other side to avoid blowing out wood on the other side, which might show on the final piece.
Halfway in and halfway down.
After knocking out chips from the whole width, I go back and move my chisel again to the 1/2 way mark. Since this is half of the half, it is a little lighter of a cut.
Move the chisel back to take about half of what's left.
I keep going back 1/2 of the remaining thickness as long as I dare, then I get really close to the line and make an angled cut to add a bit of a chamfer that will hopefully help avoid blow out later.
Roughing out a bit of a chamfer to help later.
Now, I turn the board over and do it all again.
Second time, same as the first.

Here's what it looks like when I'm ready to move to the next step.
Using a mallet on a chisel to bash out waste like this is efficient for rough waste removal. What I do now is use the chisel with hand pressure only to knock down some of the high spots, which will save time with the router plane. If I'm not using a router, I will do this part very carefully, checking my work often, until I am down to the lines and everything is square.
Chiseling across the grain with hand pressure only to refine things a bit.
Make sure to keep all of your body parts behind the pointy end for safety. For control, you can hold onto the chisel with your off hand to guide the cut.
Guiding the cut with my off hand.
When I'm as close as I dare, I finish off the joint with a router plane. We've saved a lot of time by roughing out the joint to this point with a chisel, and this plane is going to flatten and measure everything to perfectly flat for us.

Take light cuts with this tool, it should be thought of as a fine finishing tool for joints like this.
The end result should look something like this:
Feeling pleased with myself only lasted an hour or two: I exclaimed a profanity while sitting on the couch watching TV with The Frau later that evening. It only then dawned on me that the feet only were to get this kind of joint, the braces at the top were supposed to get a bridle joint.

The bridle joint allows the grain of the leg to appear to go all the way up to the table top, leaving room for your eye to see the mortise for the trestle by itself.

Structurally, the mortise and tenon on the top brace will be fine, but now the mortise and tenon for the trestle will be right next to the now visible joint for the cross brace.

I'm committed now, since I have no more cherry on hand to do the braces over again. We'll see if I get that far before I have to leave again for Spain. But, in the end, it is a small detail that might not look too bad. We'll have to see.

I can always paint it like I originally planned.

Saturday, December 22, 2018

American Trestle Table - Part II: The Parts

The slab for the table top was delivered, and it is stunning!
Sadly, this stunning slab doesn't look as good in photos as it does in real life.
I'll have to figure out how to photograph this table, because so far I haven't seen a picture that does this slab justice. It is just gorgeous. There is a lot of color and figure in it, including some curious dark pink streaks that I've never seen before. I bet over time those pink streaks turn brown, as all wood does eventually.

I showed the client the table top on a video call, and The Frau immediately talked her into leaving the slab it's full dimensions of 190cm x 80 cm, and out of my plan of making the base out of pine and painting it black.

Too bad, as the chosen wood of cherry complicates this build greatly. I'll now have to think about matching grain and color for the laminations. Fortunately, I have enough cherry laying around for this project.

It would have been nice to buy some thick cherry posts, but the lumberyard where that wood is available was closed for the holidays. I'll do my best with the cherry that I have. If it doesn't look as good as I think it should, I can still paint it.

In the meantime, let's get started. I had some fun rough dimensioning the lumber I'll use, and cut the center brace. I successfully tried sawing it out with the taper from the rough. I usually think of doing that after I had ripped the piece and four squared it. This was easier.
Sawing a tapered brace from the rough board.

It turned out nice, but the shop looks a bit dark, doesn't it?
I've been spoiled woodworking in Spain with all of the natural sunlight I get in the room where I woodwork. I finally got fed up with my botched lighting scheme, which was using some recycled spotlights from our living room.

I could get light where I needed it by turning the spotlights to where they were needed, but they were hot and less than ideal.
Don't mind the mess. Wouldn't you agree it's time for new lights?
I did a bit of research, and bought a set of four 120 cm long integrated LED shop lights from Amazon. They each are just 36 watts, 2800 lumen, and have a color temperature of 4500 K.

I couldn't find information on these (or any) shop lights as far as how they are wired, and if they could be wired from one to the next, or if they each needed their own circuit. I crossed my fingers, and they arrived just as I wanted: easy to wire and up to six of this model can be wired in series.
This should help.
More than 10,000 lumens should light up my 7.6 square meter shop nicely.

It is a terrible thing to get old.

I hung three of the lights on chains that I rigged. It works perfectly. They are on a diagonal angle over my bench. I did this to avoid as many shadows from direct lights that I could.
I lowered the lights from the ceiling by hanging them on these chains.
There's still a bit of neatening up to do with the wires, but overall I'm happy.
The idea is to put the last one on the ceiling behind the support beam to light up the back of the shop where my tool chest is.
Enough of that. Let's get back to woodworking. Since I'm now using cherry instead of pine, I needed to get back on track. The dimensioned wood for the base is all supposed to be 32mm thick, but some of the wood I have is 52mm, and the rest is 42mm. That's a lot of work with a scrub plane.

I decided to hit Peter up and I schlepped my wood over to Dictum to run it through their machines. In about 90 minutes I had it all ripped, jointed and planed to rough shape. I even was able to rip some legs in walnut for another side table intended for a future "honey do" project.
I'm not a purist. This saved about six months worth of work.

Finally, I am able to start some joinery. I cut the first half-mortise on one of the table's feet using my BadAxe carcass saw. I haven't used it much since I got it about five years ago (maybe more) because the very first cut I did with it (incidentally, a cut exactly like this one) I twisted the saw in the wood and thought I bent it. Turns out I just de-tensioned it, and Pedder was able to sort it out in short order. This saw is filed crosscut, and works great. However, I think if I was to do it again, I would get it in a hybrid cut instead.
My BadAxe carcass saw with the no-longer-available stainless steel spine and cherry handle.
I realized when doing this crosscut, that the overhead lighting is amazing, but I'm having trouble seeing my line on the side of the board. You can see in the picture above that the edge of the board is remarkably darker.

This gave me the idea to mount the last light on the cross support, rather than behind it. It still lights up my tool chest, but additionally throws some light on my bench from the side. I even mounted it with some wedges, to give it a little more of an angle at my bench.

There is even enough room to mount another of these lights, if I wish, right next to it so I could have light all along this cross support throwing light at the full length of my bench. We'll see.
Light #4. I brought it down here to give me some angled light on my bench.

It works brilliantly. I can now see my lines on both the face and edge of the board.
Can you tell I'm excited about my new lights?

After sawing my half-tenons, I bashed out the waste with a chisel, tried to get relatively close with the chisel, and finished up with my LN router plane.
This plane was born for this cut.
It worked great. I was a bot concerned about the glue up, as I've had problems in the past getting boards lined up and staying put when clamping. To help, I planed a small block to fit the length of the mortise to keep the mortise lined up during glue up.
glue up.
It worked great. This foot is in the clamps, and I have the other foot cut out and ready for glue up.
So far so good.
I don't have enough clamps for more than one of these glue ups at a time, so I'll glue up foot #2 in the morning, before we drive to the in-laws' for Christmas.

I'll get a bit more of this done after Christmas, but it's not looking like this project will get finished before I leave for Spain again on the second.

No biggie, this project is not under an urgent deadline. This table will get finished the next time I'm here.

What are your thoughts about using cherry laminations for this table? Do you think I'll have to paint it in the end, anyway?

Friday, December 14, 2018

American Trestle Table - Part I: The Plan

The Frau and I flew in to Germany yesterday for the holidays. We need to spend a few days during Christmas with the Schwiegereltern (in-laws), but the rest of the time I'll be home with access to my shop.

As a reminder, I followed The Frau to Spain when she was offered a temporary position there. We'll likely stay there another couple of years before we come back to Munich, where we own an apartment with my shop in the basement storage room. While we're away, a friend has been looking after our apartment, which is really nice, and removes the stress of wondering if our apartment is doing OK.

Since she is really hooking us up with this, I had no problem offering to make her a dining table when we found out she bought a new apartment that is being built.
Future table.
In other (shorter) words, I have a client who wants a table.

After collecting some information from her, I found out she wants a table that is approximately 160cm x 80cm. She is putting it in the corner of her kitchen/diner, between two benches that are being reupholstered.
The benches that this table will go with.

I thought that a four-legged table would make getting in and out of the benches difficult, so the client agreed (to The Frau's horror, because she hates this design) my idea of a trestle table similar to the one Christopher Schwarz built for Popular Woodworking a few years back.

I'm extremely excited because I've always wanted to build this table, but have never had a reason to. The client absolutely loves the look of this table, so it's a win-win.

The client was really excited when I showed her what I had in mind for a table top. She agreed to buy a solid slab of maple that I sourced from a friend here in Munich. It looks awesome in the single picture I have of it, and I can't wait for it to be delivered to me later today.
Solid maple slab.
My friend is a carpenter and his hobby is collecting slabs of wood to make dining tables. He agreed to let this one go, even though it's already been flattened with a CNC machine and given a coat of oil.

Unless I can talk the client into a little longer of a table, I'll have to lop off about six inches from one end. This slab is 190cm x 80cm x 4cm. It's a little thick for this table's design, so I'll likely lighten up the look by beveling a wide chamfer on the underside. This is a trick I've used before to make a thick table top appear thinner than it is.

The client also wants the corners to have a heavy rounding so it doesn't hurt when it is bumped into.

All of that is no problem, and with the single slab table top, there is not much that has to be done to get the table top ready. Nearly all of the effort for this table will be in the base. At least, that's the plan.

The client surprisingly liked the idea of the base painted black. This is great, because I then won't have to worry much about what the actual wood looks like for the base. I'll stick with CS's idea of laminating pine boards together to make the square beams for this table. Since it'll be painted, my plan is to use scots pine (Pinus sylvestris) because it is light and easy to work.

The main difference for my table, is it will have to be adjusted from the one in the magazine by making it substantially shorter.

Luckily, I remembered that CS posts SketchUp files for all of his projects online, so I downloaded the one for this table.

I suck with SketchUp, but I was able to get something that vaguely resembles the table in the correct dimensions (see the first picture in this post). I adjusted the table top in Sketchup to the desired dimensions of 160x80, and then adjusted the base. I chose the dimensions of the base by making the negative space of the base a golden rectangle. It seems to look pretty good to my eye.

I often don't work with plans or cut lists, but if I have a project with definite parameters, I find they help.
My cut list. Kiefer is the German word for scots pine.
Luckily the client's new apartment is still under construction, so if I don't finish this by the time we leave for Spain after the holidays, I'll be able to finish it up next time.

Wish me luck!