Monday, July 31, 2017

Care of saws - A personal journey

First of all this is not a complete guide to care for saws, this is probably just a personal journey of studying and bringing that knowledge to bear on the real problem.

Problem statement: My saws take forever to cut.

Last week I embarked on a journey of learning and doing with this problem statement and I learnt a lot. A whole load that I already knew, and then some aha moments. So lets just call out the facts 

1. Ripping is different from cross cutting - hence a rip saw will cross cut slower than a cross cut saw

2. Number of teeth or PPI is important. Only 4-7 teeth should be engaged in the timber at any given point. More and the saw will bind, less and the saw will tend to jump and vibrate, but still cut.

3. Sharpening a saw is not difficult, it needs a few jigs and guides that you seriously can make in a few hours. I took an entire week of 15 minutes a day.

4. A back saw should ideally be a rip saw

5. All saws have a set. The set allows the saw body to move through the cut easily.

6. Pull saws make for economy of wood and of energy (effort)

7. Some people really explain saws beautifully, if you are willing to spend hours searching through the internet.

The meat
This article is much more than a primer. Its long but the explanations are beautiful
http://www.vintagesaws.com/library/primer/sharp.html

Yesterday, with no fuss and being only half prepared, I went ahead and sharpened my back saw. I mucked up a few teeth, but all in all it is cutting much better than it was. Faster and cleaner too.

SO SUCCESS.

Tools and jigs
Read about the Making of the jigs here.
The tools and jigs are easily available and I made all the jigs. One jig remains though, a jig to help me set the teeth. Right now that is not too important since the teeth have what seems like proper set, the blade does not bind, neither does the blade jiggle in the cut.

Tools
1. Mill file with a fine cut like a bastard cut or finer (Yes Bastard... look it up)
2. Triangle file

Jigs (I made them all)
1. Saw clamp
2. Saw jointer
3. Rake angle jig
4. Fleam angle jig for the cross cut saw.

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