I'm still on my quest to learn how to use the JS-2 for ripping long boards. It turns out that this is quite a challange. I've sent email inquiries to a number of stores that sell Japanese handsaws. Here are the suggestions I have received. Somehow, I feel it is an honor well above my station to be referred to as "Bob-san."
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From Hido Japanese Tools in Berkeley, CA
Bob-san,
Osamu (the store owner) said in Japan people said "3 years for sawing". It is especially difficult to rip-cut. The tip is to position yourself in front of the board. You look at the saw in the way your saw is between your eyes. Practice makes perfect.
Yuka Johnson
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From Bridge City Tool Works
Ripping with a ryoba is a challenging task. A guide will help with blade drift. If the board is short enough, clamp it in a vice vertically. Then clamp another board on your cut line. Use the board as a guide for you to saw against. It should help with blade wander. You may need to experiment with clamping your guide board on one side of the line vs. the other.
And yes, practice will help, sorry to hear about the 3 year advice!
Thanks,
Michael
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From Japan Woodworker in Alameda, CA
Hi Bob,
Aside from repeating the addage "practice, practice, practice" I would try setting up some sort of guide so that you do not deflect the blade of the saw after it enters the workpiece. Even a block of wood with a magnet buried into it to hold the saw blade straight would be a help. See
http://japanwoodworker.com/dept.asp?dept_id=13250
Regards,
jack.japanwoodworker@gmail.com
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It seems that my best option for a mecanical solution is to use a second board as a guide.
So far, except to the two-handed grip and stance in front of the board, I have not receieved any advice as to why the saw would drift off course. If anyone out there in hand tool land has some suggestions (for example, "you drift left of the line because you do X") I would greatly appreciate it. Also, if others are experiencing this same problem, let me know. Thanks, and I'll keep posting until I find a solution