Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: stevehuck on January 12, 2010, 06:24:49 PM

Title: A axis setup ?
Post by: stevehuck on January 12, 2010, 06:24:49 PM

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.
Title: Re: A axis setup ?
Post by: M250cnc on January 12, 2010, 06:32:13 PM
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
Title: Re: A axis setup ?
Post by: Overloaded on January 12, 2010, 06:40:28 PM
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
Title: Re: A axis setup ?
Post by: Overloaded on January 12, 2010, 07:06:41 PM
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
Title: Re: A axis setup ?
Post by: stevehuck on January 12, 2010, 07:25:46 PM
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.
Title: Re: A axis setup ?
Post by: Overloaded on January 12, 2010, 07:40:42 PM
..................then you would want to stick with convention. :)
Here ia an illustration, can't find the one I had.
Russ
Title: Re: A axis setup ?
Post by: stevehuck on January 12, 2010, 09:04:04 PM
Exactly what i was looking for!!

Thank you!
Title: Re: A axis setup ?
Post by: Greolt on January 13, 2010, 01:58:01 AM
Yes there is a conventional direction of rotation.

Not that you have to follow convention of course.

Here is a pic I found.

Greg
Title: Re: A axis setup ?
Post by: Hood on January 13, 2010, 03:01:03 AM
One problem I see with not following convention is the toolpath view would be showing incorrectly for the A Axis.
Hood
Title: Re: A axis setup ?
Post by: Greolt on January 13, 2010, 03:30:27 AM
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
Title: Re: A axis setup ?
Post by: Hood on January 13, 2010, 03:58:06 AM
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
Title: Re: A axis setup ?
Post by: stevehuck on January 13, 2010, 05:44:14 AM
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.

Title: Re: A axis setup ?
Post by: Overloaded on January 13, 2010, 08:53:31 AM
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
Title: Re: A axis setup ?
Post by: bowber on January 13, 2010, 10:05:38 AM
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
Title: Re: A axis setup ?
Post by: RICH on January 13, 2010, 11:13:00 AM
Russ,
Maybe put them in the Members Docs along with the right hand rule info.
RICH
Title: Re: A axis setup ?
Post by: Overloaded on January 13, 2010, 11:44:48 AM
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 :)
Title: Re: A axis setup ?
Post by: RICH on January 13, 2010, 12:02:18 PM
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