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Thread: UNKNOWN Handplane ?
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27th October 2016, 03:27 PM #46
OK I'll have a go
for me, the bedding angle should be measured at 90 degrees to the line of the plane's mouth. For a plane with no skew this will be the same as measuring the angle parallel to the long axis of the plane.
Then, while the cutting edge is skewed relative to the long axis of the plane, as is the mouth, the angle the bed makes with the sides of the plane -- provided the sides are parallel to each other -- is the same, and the angles either end of the blade are supplementary -- i.e they add to 180 degrees.
(From memory it's 5th or 6th grade geometry, but someone else can look up the curriculum.)
I visualise it by extending the bed beyond the sides of the plane, the angle made by the bed on the outside face of each side of the plane is the same as the angle made on the inside face of the opposite side, which is the same as the angle made on either side of the plane's sides . If the angles weren't the same, the lines representing the angles relative to the sides of the plane would converge, which is not allowed for parallel lines.
BUT, if there's a plane maker's convention about measuring bedding angles ... I don't know what it is.regards from Alberta, Canada
ian
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27th October 2016, 04:09 PM #47GOLD MEMBER
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Peter, you are talking about a compound angle, correct? For example if you wanted a 20degree bed angle with a 5 degree skew. On a table saw, tilt the blade to 5 degrees, set your miter gauge to 20degrees/70degrees. Then the only question that needs to be answered is "how many would you like sir?"
So you will end up with 3 easily measured angles. 20degrees along both sides, 5 degrees across the bottom width, and i dunno...2 degrees or something across the back width of the plane.
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27th October 2016, 04:37 PM #48
Kuffy,
I was wondering when the compound miter saw analogy would come up.
Edit sorry had a brain explosion there ... TABLE saw that should be!!!
You got it.
I'm doing the new thread now, and have a pic of the saw, and some pine blocks ...yeah, how many do you want?
Funny how when you point your head at something, the simple answer might be right in your workshop next to you.
Cheers,
Peter<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <woNotOptimizeForBrowser/> </w:WordDocument> </xml><![endif]-->
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27th October 2016, 04:39 PM #49
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28th October 2016, 01:52 PM #50GOLD MEMBER
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Don't listen to me, I have no idea I tells ya! It has been brought to my attention that it isn't quite as simple as just tilting the blade to 5 degrees and setting the miter gauge to 20degrees. Ya gotz to account for the tricky compound miter. So the finished angles will be 5 and 20 degrees, but off the top of my head you need to set the miter gauge to 20degrees and the blade tilt to about 4.7 degrees.
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