Primitive Archer
Main Discussion Area => Bows => Topic started by: DC on April 29, 2018, 04:44:19 pm
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When you are tillering do you scrape from the handle out or from the tip in? Why?
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Handle out. Why? I like to scrape, rasp and sand with the grain otherwise I'd end up gouging the wood. Usually the grain runs handle out. Jawge
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Both ways. whichever is working better at that moment.
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Both ways. whichever is working better at that moment.
Yup.
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Both like Badger said.
Bjrogg
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+1 yup
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I was out scraping away and it felt like the first half of the scrape was taking more wood off even though I was trying to "take long even strokes" so it got me to wondering if you guys scraped one direction to minimise the effect of this.
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That's probably because you start scraping with the best mechanical advantage to apply pressure and lose it as you reach the back end of your scrape.
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The thing I have to watch when scraping is not to scrap from the same side and the same direction on limb, if I do I have a tendency to scrap more on one side of limb than other. Thanks to Eric krewson for teaching me that early on.
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I work at a normal bench vice so I'm always working from one side. I have to be very careful not to get too thin on the side closest to me. And I turn the bow to work on the other limb so if I'm not careful I tiller prop twist into the bow.
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i still make the mistake of taking too much from one side, in my mind the scraper isn't removing much wood but in reality it is and is very easy to get one side thin if not constantly monitoring.
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Yes a person has to know their own tendencies when using hand tools.I am aware of mine too.Making pencil marks across my work first helps many times.Then removing them.With that in mind I've gone to using carpenters' pencils they last longer.
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Yes a person has to know their own tendencies when using hand tools.I am aware of mine too.Making pencil marks across my work first helps many times.Then removing them.With that in mind I've gone to using carpenters' pencils they last longer.
I do this too.
I also tend to scrape out from the handle until mid limb, then scrape in from the tips to mid limb. But it depends on whether it's 'uphill' or 'downhill' aka if the limb has a taper in thickness I'll usually scrape 'downhill' because I feel like that reduces chatter/tearout.
Also, sometimes it just feels like the wood has a particular direction it wants to be worked. usually the direction that it grew in.
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I scrape from tip to handle but the only reason for that is that my workspace is so small I can not walk around my bow or even work on it from the other side. I keep looking down the limb for the same thickness because I too have made the mistake of scraping more from one side more than I like to admit :-[
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I take around 20 scrapes and then check tiller.
I run my fingers along both sides of the limb to make sure both sides have the same amount of wood removal.
Finally, I look at both sides to make sure wood removal is even. If not I mark with a pencil and fix the issue.
If you don't check you'll end up with a bowyer caused prop twist.
Jawge
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This used to plague me for a long time. I would think I had even scrapes on both sides of one limb, but when I checked it over later, it would not be even thickness at all. I learned to check it on the tiller and flip the bow around and check the other side, and pretty much do this every single time it went back on the tree. I would just mark the problem areas with one side, then when it is flipped, mark the problem areas on the other side of the limb. Has worked like magic! I used to only check from one side until final tillering but i'm glad I do it this way now. It's like the tiller will tell you what to do to get the thickness taper even.
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Like Badger said, whichever way works best at any given moment. Which tool I use and how depends on what the wood wants, not always what I want.
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Yes,I've have gotten one side to thin because of My OCD,trying to get a perfectly centered v with the grain.