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Thread: Triangles for machining
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27th Jun 2020, 01:15 PM #1Senior Member
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Triangles for machining
Just finished making these for milling setups. 45deg and 60/30deg.
I made them on the CNC from 1/4" perspex and they are both 100mm on the hypotenuse.
There's no way for me to check them for accuracy but they should be aweful close since they are mathematically produced.
If anyone is interested in having the G-code just let me know and I'll post it.
triangles.jpg
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27th Jun 2020, 05:31 PM #2Most Valued Member
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Nice!
A reasonable way to check them would be to cut another two of the 30/60 and then you could put 30+60 and check for square.
Use the third one for 30 +30+30 to make sure you haven’t got 28 + 62 deg etc.
The 45deg one you should be able to just check against a second one.
Steve
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27th Jun 2020, 09:06 PM #3Senior Member
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27th Jun 2020, 09:53 PM #4
Hi Phaser, Guys,
Making another one would be a test of how accurate your CNC is !Best Regards:
Baron J.
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27th Jun 2020, 10:34 PM #5Senior Member
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28th Jun 2020, 11:12 AM #6Most Valued Member
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30th Jun 2020, 10:41 AM #7Senior Member
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Making these triangles has made me realize something that could be significant to some people.
If you have a lathe where the dials read direct, and you take a 10 thou cut, you will actually take 20 thou off the diameter of the part , right ?
With a 30/60 triangle the opposite side is exactly half the length of the hypotenuse.
So just swivel the compound to 30deg and whatever you set that dial to will come off the diameter.
I don't have any trouble remembering to double the figure but it can be confusing so this might useful to someone.
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30th Jun 2020, 09:58 PM #8Gear expert in training
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Further tip similar to that, setting your compound to 3 degrees off horizontal will give you a (near enough to) 10:1 diameter ratio (1 thou on the compound = one tenth on diameter) if you need really fine control.
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