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Thread: Plane sole flattening, again...
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9th May 2019, 12:48 PM #31
More consistent surface = lighter cut?
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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9th May 2019, 12:53 PM #32Taking a break
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10th May 2019, 01:46 AM #33GOLD MEMBER
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Every one that I've used has always developed stray scratches, too. Even if the wood is agreeable, something will always be scratching the bottom - stray grit, a staple in something, whatever it may be.
but the flatness remains!!
I think Rob fill find that the finer the bottom finish and flatness are, the easier it is to get consistent very thin shavings.
That's how one sells planes at wood shows. It's a little harder to use in rhythm in the shop, but there's something nice sometimes to finding out what the end point is. I still marvel a little each time I come across a new LN or LV plane (which isn't something I buy often these days), because I'm used to spending a half hour with each bench plane, or some similar amount, to get the sole where I want it, the cap iron cleaned up and the iron set up or back ground flat.
Then, you get a premium plane out, sharpen it in a matter of a minute or two, wax it, and it works a treat.
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10th May 2019, 10:32 AM #34
What about the data?
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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10th May 2019, 12:48 PM #35
Nobody?
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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10th May 2019, 12:50 PM #36GOLD MEMBER
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10th May 2019, 12:53 PM #37GOLD MEMBER
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Wait, the chart shows the standard deviation in what? Shaving thickness? And the surface finish is charted to standard deviation of shaving thickness? And that standard deviation settles in around 2 ten thousandths?
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10th May 2019, 12:56 PM #38GOLD MEMBER
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er, wait....I admit I didn't read all of the posts to this point. standard deviation in the planed surface. 2 1/2 ten thousandths? Got much better after shaving thickness normalized?
If that's what I'm reading, sounds about right, except I have no way to judge whether or not the standard deviation is typical because I couldn't measure it in the first place .
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10th May 2019, 12:59 PM #39Taking a break
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For those of us who aren't statistically inclined, could someone please explain the data in plain English?
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10th May 2019, 01:12 PM #40
What I think the data shows is that the thicknesser, Shelix equipped, produces a pretty flat surface which has deviations, which are palpable. When I adjusted the plane to take minimal shavings the standard deviation of measurements taken of the planed surface, not the shavings, seemed to settle. This result suggests to me that I gradually increase the cut depth and see what happens.
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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10th May 2019, 01:14 PM #41
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10th May 2019, 01:17 PM #42GOLD MEMBER
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I think you'll find more surface deviation with thicker shavings, especially on a plane with a single iron.
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10th May 2019, 01:24 PM #43
The standard deviations reported are for the measurements of the planed surface at 7 points each for lines 1, 2, and 3. The average SD is for all 21 points measured. I zeroed the gauge at the 0,0 point and measured each subsequent point, up to 7,3, relative to 0,0. This method of measurement reduces the influence of human factors, i.e. am I holding the plane flat during the pass etc.
What I'm seeing, I think, is that the plane produces a smoother surface (more consistent standard deviation) when it is set to cut a thinner shaving. Note that the data are taken after five cuts, thus the total removed is something like 0.004"-0.006". The earlier data had many cuts that were in the 0.004" to 0.006" range per cut. This suggests that more thin cuts are better than a few thickuns.
I predict that as I deepen the cut the standard deviation along each of the three lines of points will increase, we'll see.
Anecdotally, the minimum thickness shaving I was able to get with the plane lapped at 60 microns was 0.0015" to 0.002" thick. At 30 microns it is just a little less than 0.0001".Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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10th May 2019, 01:25 PM #44Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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10th May 2019, 01:47 PM #45
Just for FYI purposes, I honed the blade to 6000 grit with a 30o included angle and lapped the back with 60 micron.
Innovations are those useful things that, by dint of chance, manage to survive the stupidity and destructive tendencies inherent in human nature.
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