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25th March 2017, 01:02 PM #1SENIOR MEMBER
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Sheer scraping - big or little bowl gouge?
Hi folks,
After a couple of days struggling with tearout on some soft, curly new guinea rosewood, I am thinking I'm going to embark on trying to embark on a project to improve my sheer scraping technique.
The first thing will be practice, but I'm also willing to throw some money at the problem - thinking about it, it seems like a big bowl gouge would make this easier... Is that accurate?
Cheers,
Danny
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25th March 2017, 01:58 PM #2
I find it easier, but mainly because it has a bigger wing to use, thus I get more sharp edge by rotating slightly. You can do with any though provided they are sharp.
Neil____________________________________________Every day presents an opportunity to learn something new
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25th March 2017, 02:14 PM #3
I use a thin card scraper and it does a really good job.
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25th March 2017, 02:34 PM #4SENIOR MEMBER
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Do you mount it on a handle or anything handyrn? Seems like it'd be a bit scary to just have the card in bare fingers next to spinning wood!
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25th March 2017, 05:30 PM #5SENIOR MEMBER
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I often use a curved cabinet scraper on the bottom of bowls, down hill, with the grain, STATIONARY !
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27th March 2017, 10:36 AM #6SENIOR MEMBER
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Ah! Sure, stationary I can see it. Particularly if you are already well practiced with card scrapers!
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27th March 2017, 10:21 PM #7
I have big gouges (as in 1") all the way down to small gouges (as in 1/4"), but tend to just use whatever sized gouge I have been using or is sharp.
You can use any straight or fluted tool for shear scraping on the outside. In my experience, a good well swept back bowl gouge works well on the inside. The sweet spot is where the edge is at 45deg or higher angle (ie closer to the tip). A light touch and wispy shavings are what you are after.
Although unorthodox, I find that you can also cut against the grain if your shear scraping cut is light enough.
Stay sharp!
NeilStay sharp and stay safe!
Neil
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28th March 2017, 04:19 AM #8GOLD MEMBER
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I use a half round thick scraper inside and a slightly curved thick scraper outside of bowls. They are sharpened upside down at about an 80 degree angle to raise a nice burr. They are used slanting down, very, very light cut, taking off tissue paper thin curls.
Good for one or two passes, then a quick swipe on the grinder.
If there is room to slant the scraper down, I see no point of a negative rake scraper. Going to the bottom of a tall narrow vessel, yes.
With some timbers with hard and soft mixed, nothing will do but sand, sand, sand.
I have a couple of curved stainless steel blades from a scrapped food processor sharpened as above for hand scraping.So much timber, so little time.
Paul
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28th March 2017, 09:18 AM #9GOLD MEMBER
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Danny, do a utube search on Negative Rake Scrapers. I watched Retired use one at the Prossie Turnout last year and I was sold on their versatility. I had a billet of McJings HSS flat bar, so I knocked one up to try it. I use a lot of Qld Maple, one of the worst furry timbers around and the NRS was so easy to use.
Rgds,
Crocy.
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28th March 2017, 10:10 AM #10SENIOR MEMBER
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I have seen NRS where the grind angle is the same on top andbottom and then others where the bottom angle is the standard grind but the tophas a much smaller grind, just enough to take out a small bevel almost. Isthere a difference in operation between the two or is one better than theother?
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28th March 2017, 10:36 AM #11SENIOR MEMBER
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Yeah, I am a fan of negative rake scrapers - my go to for finishing cuts is a big hefty round hamlet scraper, sharpened with a small bevel on top.
It's absolutely brilliant for hard timbers (and acrylic pens), but isn't as good on the soft stuff, like the NGR I have been playing with this week!
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28th March 2017, 11:43 AM #12GOLD MEMBER
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28th March 2017, 12:04 PM #13SENIOR MEMBER
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29th March 2017, 01:14 PM #14SENIOR MEMBER
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Today I took some photos of the bowls which provoked this question, and decided to share!
Cheers,
Danny
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30th March 2017, 12:16 AM #15GOLD MEMBER
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I take it the area on the right side near the bottom of the top left bowl in the group shot is what gave you the trouble.
Hand scraping with a curved cabinet scraper in the problem area and blending into the surrounding area, along with hand sanding the area with the lathe stopped is one solution.
There are many ways to get to the same place. I think we have to figure out what works best for us and keep refining and practicing.
The bowls are beautiful. Nice simple shape that shows off the figure.So much timber, so little time.
Paul
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