Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: stevehuck on January 12, 2010, 06:24:49 PM
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If I set my rotary axis on the left side of the mill facing tward the spindle (standard deal) and have the axis at zero. If I give mach the old A10.00, will zero degrees rotate tward me or away from me. What is the standard direction of rotation.
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What ever direction you want.
All things being equal you will have a machine with no backlash, and rotating 10 degrees will rotate in a climb mill fashion.
If you have backlash then you will find in best to use the conventional method.
Phil
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Typically, if you stand in-line with and axis with POS direction going away from you, then a rotary for that axis will be (+) clockwise from that view.
I'll look for the illustration.
Of course...Phil is right too, you have the power to make your own rules if you'd like. :)
Russ
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Here is a clip,
"Now for the cartesian coordinate system right-hand rule as it applies to a rotary axis direction. Imagine wrapping your right hand around a linear axis with your thumb pointing toward the positive direction. The direction that your fingers are wrapped represents the positive direction for the rotary axis that rotates around that linear axis."
Still looking for that dang pic I had.....it's perfect, wherever it is. lol
Russ
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What ever direction you want.
The thinking is that if there is a standard direction then i could comply and increase my chances of being able to pass off a piece of Gcode to someone else.
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..................then you would want to stick with convention. :)
Here ia an illustration, can't find the one I had.
Russ
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Exactly what i was looking for!!
Thank you!
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Yes there is a conventional direction of rotation.
Not that you have to follow convention of course.
Here is a pic I found.
Greg
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One problem I see with not following convention is the toolpath view would be showing incorrectly for the A Axis.
Hood
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Yes that is one good reason to follow convention and there are many others.
I said you don't have to follow convention, because I often encounter a bit of resistance to the idea of a conventional direction, whenever I mention it.
Sort of hosing down the flames before they start. ;D
Greg
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Yes I know what you mean, often get questions about rotating the toolpath view so that it works the way people have there axis set up. Simple answer is the toolpath view conforms to convention and if your machine is non conventional you either live with it or make it conform ;D
Hood
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I'm thinking also, if i get some software to engrave on a round surface, wont everything be upside down if A axis is reversed from "standard"?
Why not just get hooked up correctly the first time.
my 2 cents.
Thanks for the info. hope to be testing this axis in the next week or so.
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Haaaah...finally found it.
This is the best illustration I've seen.
(I think I'll put it where I wont loose it again)
Russ
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My thinking on this is that you want the material to move in such a way as the cutter cut as if it was machining on the normal X or Y axis.
So if your A is in line with the X you are replacing the Y axis, if + moves are away (tool movement) from the front of the machine then the top of the stock would need to rotate towards you, anti clockwise if the rotary is on the left of the table.
Basically as the diagrams have shown.
Steve
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Russ,
Maybe put them in the Members Docs along with the right hand rule info.
RICH
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Hey....good idea Rich.
DONE !
It should make a good reference...and I wont loose it there. ::)
(I actually feel like I've made an official contribution.......it feels good.)
Thanks,
Russ :)
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RUSS,
Good going as i will need a pic for a write up i am picking away at.
Steal with pride from the best of the best!
Jump into the recent rotary posts, you'll be able to increase your contributions and get an A
on next the next report card. ;D The spider has cast his web! >:D
RICH