13/4/2015

This is the second of a working set of bow saws that I am building at present. I decided to use Andre Roubo’s plates as inspiration for this one. If you are interested in this brilliant book by Lost Art Press, check it out here. The final picture in the series below is what I was aiming for.

My bench while all this was going on.

In terms of wood, I thought Assegaai (Curtisia dentata) would be perfect given it’s strength and resistance to splitting when flexed. In the pictures below you can see the pieces I selected. You might be able to see how the grain is running off to the side at one end of both pieces destined for the cheeks. I specifically chose it like this to follow the curve of the top end of the cheek, hence improving the strength.

I used dividers to get a sense of the proportions of Roubo’s saw. One fixed measurement was the length of the saw blade (700 mm) as bought from Dieter Schmidt. I applied the proportions to this starting point to establish the length and width of the cheeks. In terms of the shape I simply drew something that followed the grain and added some artistic je ne sais quoi.

I drilled and chopped the mortises in the cheeks prior to shaping.

With the stretcher in position I marked out the correct location of the holes for the cross pin (6 mm or ¼” steel bolt in this case)

 

20/4/2015

These holes were tapped and countersunk.

Next step was to cut the kerf for the blade.

I used the bandsaw to do the rough shaping.

The lines to guide the next phase of shaping were drawn as shown, using my finger as a fence. It is quick and easy.

The rest of the shaping were accomplished with spokeshaves, files and a card scraper.

I used the same piece of Tamboti as mentioned in my previous post for the spindle of this saw. It was simply a bit bigger.

A quick test fit. I really hope Brian Eve (Toolerable) does not get on my case again with regards to the string I used. I do not even know what this stuff is called, but it is cheap and available so that is what I went for.

Tung oil treatment.

Don’t you think Assegaai is exceptionally beautiful? I do. This saw hums through African hardwood. Viva Monsieur Roubo!!

My next project will be a Fidgenian frame saw. The other saw I have built already is a 12″ bow saw. Go here if you want to take a look.

13/4/2015

As you probably know by now, I am in the process of building a working set of frame/bow saws. For the small bow saw I decided on Witpeer (Apodytes dimidiata) to compliment the quality hardware from Gramercy tools. I also decided to use their design, as their reasoning for how they came up with their design made perfect sense, given all the other reading I did on the topic. This is a link to their plans. I found this discussion very helpful in terms of understanding the important design aspects.

In the picture below you can see how my new bench light made it much easier than before to chop the two tiny mortises in the cheeks after removing the bulk of the material by drilling.

The rough shaping was done on the bandsaw.

Just a quick reminder of what the hardware looks like.

The rest of the shaping provided me with an ideal opportunity to use my new spokeshaves from Veritas. We were in Johannesburg over the Easter Weekend, which meant that I could do some shopping at the Hardware Centre in Randburg. They usually have bits and pieces of Veritas tools lying around.

Sawing the tenons of the stretcher.

Shaping the stretcher.

First fit.

I then turned the handles and epoxied the brass pins into position.

Fitting the handles.

A picture to show what my bench looked like while building the first two bow saws.

20/4/2015

For the spindle I found a Tamboti (Spirostachys africana) off-cut. This is as far as I am concerned one of the most precious African woods. If you want to know a bit more about Tamboti, use this link.

It is very difficult to turn small pieces like this in my lathe. Therefore I decided to used the method illustrated below to turn the Tamboti spindle.

I flattened two sides of the lower section with a block plane.

The first assembly prior to finishing …

 

… which was followed by a Tung oil treatment. You can also see some of the parts of my monster Roubo-esque crosscut bow saw these pictures. I will write a separate post on that project, which should be publish later this week.

There you go … one 12″ Witpeer bow saw completed.

I recently bought an old number/letter punch set and tried it out for the first time on this saw.

The Roubo Beast Master (to steel a term from Mark ‘Bad Axe’ Harrell) crosscut bow saw is also finished.

PS – Thank you to my friend Jonathan White (The Bench Blog) who taught me how to insert links.

 

16/1/2015

One of my key projects for 2015 will be to build a working collection of bow saws. I bought the big blades (700mm in length) below from Dieter Schmid in Germany. The plan is to build a Frame saw using the rip blade and a Roubo-esque crosscut bow saw with the crosscut blade.

A few pictures of the crosscut saw I want to replicate loosely.  It can be found in Lost Art Press’  “Book of Plates”. I cannot say enough good thinks about Lost Art and their books. Every book is a seminal work in itself, which makes it impossible to decide on a favourite. Surgeons in my part of the world have a motto: “If in doubt, cut it out”. My motto with Lost Art Press books is: “If in doubt, buy it”.

These little beauties came from Gramercy Tools. I plan to build a smaller (12″) bow saw using their design. I plan to use it mainly from removing waste material between dovetails.

The wood for these saws is the pile on the right hand side. I chose Witpeer (Apodytes dimidiata or White pear in English) and Assegaai (Curtisia dentata).  Both these woods are extremely tough, hard and durable, which made it some of the favourites for Wagon building in the early Cape Colony. My supply comes from the Knysna evergreen forest, where I bought it more than 14 years ago.

I will write separate posts on the construction of each saw. To check out the other posts:

12″ bow saw

Roubo-esque crosscut bow saw

Fidgenian Frame Saw – part one

Fidgenian Frame Saw – part two