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Messages - rabphxaz

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101
General Mach Discussion / Re: Soft Limits
« on: November 25, 2008, 08:00:47 AM »
OK, thanks, I'll work with this and see what happens. Hood, I see that you're from Scotland, you ever read any George MacDonald Fraser, my favorite author?
Bob

102
General Mach Discussion / Re: Soft Limits
« on: November 24, 2008, 09:03:16 PM »
Well, that helps. If I forget about home positions and work coordinates, and concentrate solely on machine coordinates in order to set my soft limits, then could I dial them in kind of like what I talked about in the previous post, that is, the soft limits and the max and min machine coordinates are the same, with a 1/4 inch slow down in front of them?
Thanks again, Bob

103
General Mach Discussion / Re: Soft Limits
« on: November 24, 2008, 06:05:39 PM »
Okay, I'm back after a computer meltdown. If it isn't one thing it's another....
I have reread all the posts re: this subject several times now, and I still need some clarity. Firstly, unless I have completely misunderstood some of the posts, it seems that there is some disagreement about the Z axis and whether it is standard for the Z zero to be set at the high part of its range, and everything below that (closer to the table) is negative. Others seem to think that Z zero should be set at the work surface, and everything above that should be positive. In the case of the Z zero at the top, a soft limit above the Z zero position would be positive, but it would be negative if it is set below the low position. In the latter case (the Z zero is at the work surface), the soft limit would have to be negative if it is below the work surface. The problem as I see it with the first configuration is that you have to work with negatives, measuring down from your tool bit and then adding another negative number to that to get the cut depth you want. The problem with the second method is that if you want your tool to go home after doing a procedure, or to get ready for another procedure, it would travel at the height of, and/or end up at, the work surface, making it hard to remove the work and possibly damaging the surface of the material.
So, let's solve that first.
As to Hood's question about my machine orientation, the lower left corner of the XY axes is near the operator and on his left. As of yet, there are no limit or home switches -- this is why I want to get this soft limit thing correct.
Is it possible to avoid some of the issues mentioned above by having the soft limits be the home and positions away from home beyond which you don't want to go (that is, what I would consider the usable work surface), and the slow down 1/4 inch, say, before that? The only problem that I can see is that the machine slows down when it is working near the limits...is that a problem?
Thanks again, Bob

104
General Mach Discussion / Re: Soft Limits
« on: November 18, 2008, 08:50:54 PM »
Sorry, that should read, ...." but if you would let me know if the way I'm thinking about it as referenced in the previous sentence is correct...."

105
General Mach Discussion / Re: Soft Limits
« on: November 18, 2008, 08:48:27 PM »
No, what I think I want is that the work space is defined by the X being from 0 to 44, the Y being from 0 to 22, and Z being from 0 at the top and -7 at the bottom. If the soft limits and slow down are going to be outside of that area, then they would be, I think, at the locations I listed. Part of the problem, I just discovered, is that my manual doesn't have the soft limits section that was copied in the other post. I will go play with that, but if you would let me know if the way I'm thinking about it as referenced in the previous sentence, I would appreciate it.
Re: Home Off., in my case, that would be 000, wouldn't it?
Thanks again, Bob

106
General Mach Discussion / Soft Limits
« on: November 18, 2008, 07:23:51 PM »
OK, I totally don't understand the soft limit setup. If I define my XY work space as a 22" x 44" area that has limit switches 2" outside of that, and the Y axis has a 7" height with 1" to the limit switches above and below that, and I want to have soft limits 1" outside my XY work area and 1/2" above and below my Y, with a slow down setting of 1/2", shouldn't my Soft Limits settings be:
X Soft Max: 45
X Soft Min: -1
X Slow Zone: .5
Y Soft Max: 23
Y Soft Min: -1
Y Slow Zone: .5
Z Soft Max: -7-1/2
Z Soft Min: +.5
Z Slow Zone: .5
When I do this, I can still jog right past all of the soft limits. And, what is Home Off.? And also the manual says, "the defined limits only apply when switched on using the Soft Limits toggle button -- see Limits and Miscellaneous control family for details." Where the heck is that??? Anybody?
Thanks again, Bob

107
General Mach Discussion / Re: soft limits
« on: November 18, 2008, 07:22:17 PM »
OK, I totally don't understand the soft limit setup. If I define my XY work space as a 22" x 44" area that has limit switches 2" outside of that, and the Y axis has a 7" height with 1" to the limit switches above and below that, and I want to have soft limits 1" outside my XY work area and 1/2" above and below my Y, with a slow down setting of 1/2", shouldn't my Soft Limits settings be:
X Soft Max: 45
X Soft Min: -1
X Slow Zone: .5
Y Soft Max: 23
Y Soft Min: -1
Y Slow Zone: .5
Z Soft Max: -7-1/2
Z Soft Min: +.5
Z Slow Zone: .5
When I do this, I can still jog right past all of the soft limits. And, what is Home Off.? And also the manual says, "the defined limits only apply when switched on using the Soft Limits toggle button -- see Limits and Miscellaneous control family for details." Where the heck is that??? Anybody?
Thanks again, Bob

108
General Mach Discussion / soft limits
« on: November 17, 2008, 04:15:00 PM »
Question re: soft limits and home. Why not have soft limits 1 inch from home and slow down 1/2 inch from home, with mechanical limit switches 2 inches from home (and the opposite of home)? That way you could go home without triggering any slow down, but a runaway would be slowed down and stopped before it could do any damage. Also, is there a Go Home button somewhere on one of the screens?
Thanks, Bob

109
General Mach Discussion / HELP in Phoenix Arizona
« on: November 16, 2008, 11:32:07 AM »
Hello All,
I have just finished the physical construction of a 24" x 60" all leadscrew router with Xylotex steppers and drive box, and need help with the software setup. Is there anyone in the Phoenix area who knows a thing or two and can help me get my machine up and running? I can pay you for your time.
Thanks to all, Bob

110
General Mach Discussion / Re: general newbie questions
« on: November 03, 2008, 08:59:13 PM »
OK, then how about this: if a CAD image contains Bezier curves, can LazyCam handle it, or does it work with arcs only?

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