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29th March 2017, 08:24 PM #1
PlsHlp change axis on complex angle star project segments
You might remember this:
Help requested going from Sketchup to build on small but complex tight angles project
Bamboo Start Shped Bowl
Star_Orig.jpg
https://www.woodworkforums.com/attach...5&d=1421484345
I did finish the project is mdf.
Star MDF.jpg
But threw it out to force myself to try again.
Star 5 Points 12.7mm SKP8.jpg
Star 5 Points 12.7mm SKP8.skp
Seperated.jpg
Star Single Point Left and Right3 seperated SKPv8.skp
The Left and Right segments of the top point of my star will make up my project.
Cutting five of the left and five of the right.
I've been trying to figure out how to calculate the angles.
And failing for a few hours.
I want to knock these two segments over onto their backs but can't figure out how.
I'm hoping there is a way to simple change the axis on each one and go from there.
But, again, can't work it out.
I've tried moving flipping etc. etc.
Drivin' me mad!
Any help would be greatly appreciated.
Thanks in advance.Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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29th March 2017, 08:30 PM #2GOLD MEMBER
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What are you trying to do?
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29th March 2017, 08:44 PM #3
I'll be using my new Dewalt DWE4791-XE.
With my new Incra 1290 Mitre Guide.
DW745-Side-View-4.jpg
Incra V120.jpg
The dewalt only bevels left to 48°
But the Incra mitres left 60° and right to 60°.
I already checked them both for accuracy.Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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29th March 2017, 09:21 PM #4GOLD MEMBER
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I laid over one of the pieces. I don't know an easy way, and I don't understand how the change axes thing works so I just farted around measuring angles and rotating until I got the back dead flat. I would tell you exactly how I did it, but it would be 1000 pages long. You can measure the angles now. I think one of the angles is 17.8° but I may have misclicked when I was placing construction lines.
Star Single Point Left and Right3 seperated SKPv8.skp
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29th March 2017, 09:29 PM #5
Champion!
Many thanks!
I knew it was something to do with axis.
I build a box on the bottom of mine.
Started lines extending the edges
1.jpg
points joined to make a plane.
2.jpg
Then pulled down to make the box.
3.jpg
Then used the bottom corner of the box to set the axis.
4.jpg
Like you I mucked about with the axis until it looked right.
Deleted the box.
5.jpg
Then exploded and exploded again.
Then made group.
Then moved the bottom corner to the axis point.
6.jpg
Many thanks.Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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29th March 2017, 09:33 PM #6GOLD MEMBER
- Join Date
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- Location
- Caroline Springs, VIC
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Actually what I have done isn't 100% perfect. It is because sketchup sux for accuracy. It literally gives angle measurements as ~71.7° instead of 71.7°, so the angle should actually be something like 71.757843484° or whatever it is as a million decimal places. That segment I flattened is out by a bit. damn sketchup.
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29th March 2017, 09:44 PM #7GOLD MEMBER
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- Caroline Springs, VIC
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- 1,645
I found the culprit. Your pieces aren't an equal thickness across its width. varys by 1mm. 12.3mm -> 11.3mm. Throws in a massive curve ball for the manufacture of the item.
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29th March 2017, 09:55 PM #8
Yeah. That accuracy happens with the tape measure as well.
The incra v120 is only by 1° increments.
Don't know what Im going to do with the .7 up or down.
That x.57 should be rounded to a x.6 which I'll round up.
hope that worksThanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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29th March 2017, 09:58 PM #9
Blast!
Mucked about so much I forgot what I was going to do once I got the backs flat.
build another box along the edges then measure angle?
Tomorrow ....Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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30th March 2017, 04:25 PM #10
Barry
what you can do is approach the problem as though you were cutting crown molding.
Make yourself a wedge that corresponds to the angle of the tray sides and attach this to the face of your miter gauge.
Then when the sides are presented to the saw blade they will be at the correct "spring angle" for the cut without any difficult maths.
look at this jig Kreg® Crown Molding Mitering Fixture - Lee Valley Tools If you can sort of "turn your head upside down", imagine the miter saw's blade as being your table saw's blade and the jig as being a wedge attached to your miter gauge, then with the saw blade at 90 degrees to the table, and the work piece inclined at the required angle, the saw will cut a trapezoid with the correct angles on the end.regards from Alberta, Canada
ian
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30th March 2017, 04:32 PM #11
Thanks Ian,
Too hard for my simple mind.Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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30th March 2017, 05:39 PM #12
grab a piece of thin wood (or your smart phone)
pretend that your right hand is a table saw blade
cock your wrist so that your little finger is on the table and your right palm is vertical.
Now, using your left hand, hold your smart phone at 90 degrees to your right palm and the table -- every angle is 90 degrees
now turn the phone so that it makes an angle of about 45 degrees with your right palm -- the vertical angle is still 90 degrees, but you would be cutting a bevel at 45 degrees across the thicness of the phone.
now lay the phone back at an angle of about 45 degrees to the table -- now your right hand would be cutting a compound angle
If you attach a wedge to your miter gauge it will allow the sides to lay back at the splay angle you need. I'm guessing you want an angle somewhere between 40 and 45 degrees.
If you then angle the miter gauge to the plane angle you require, the saw blade will cut the compound angle you need. The sides will be wider at the top than at the bottom and the bevels should line up.regards from Alberta, Canada
ian
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3rd April 2017, 12:45 PM #13
hmmmm.
Did I bite off more than I can chew?
IMG_9229.jpg IMG_9230.jpg IMG_9231.jpg IMG_9236.jpg IMG_9232.jpg IMG_9233.jpg IMG_9235.jpgThanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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3rd April 2017, 03:46 PM #14
That previous question should be a statement.
I'm sure there's a smart way to do this.
Like adding up all the angles and divide by 6?Thanks,
Barry G. Sumpter
May Yesterdays Tears Quench the Thirst for Tomorrows Revenge
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3rd April 2017, 04:04 PM #15
For compound angles, this web site should be a help Compound Miter Saw Calculator
other calculators
Crown Molding Calculator. How to cut Crown Molding with Diagrams and Angle Chart
How to Cut Crown Molding | Crown Molding Angles | DEWALTregards from Alberta, Canada
ian
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