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Messages - ger21

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5811
It doesn't "monitor" the encoders. It just reads the data from them and displays it (if you add the correct DRO's). Mach doesn't have time to do anything with the data. And when you talk about correcting position, you open up a whole new can of worms. Such as, how do you correct the position of a stalled stepper, since it can't move, because it's stalled? :)

5812
Get rid of the formulas, you don't need them to slave.

5813
General Mach Discussion / Re: need help with g code and cutter comp issue
« on: November 04, 2008, 06:48:40 AM »
I coded to the same position as the OP. I believe the area you circled is below the actual part. The bottom of the part should be at the top of your red circle.

5814
General Mach Discussion / Re: general newbie questions
« on: November 03, 2008, 09:35:24 PM »
I don't think so. But at some point, the bezier curves (or splines) need to be converted to arcs or line segments, because there are no g-codes for bezier curves.

5815
General Mach Discussion / Re: need help with g code and cutter comp issue
« on: November 03, 2008, 07:58:33 PM »
How about this?

G40
G20
M3
G0 Z0.1250
G0 X-1.0000 Y-0.6000 Z0.1250
G1 X-1.0000 Y-0.6000 Z-0.1000 F6.6
G41D1
G1 X0.0385 Y-0.6000 Z-0.1000 F6.6
G1 X0.0385 Y1.7500 Z-0.1000
G1 X-1.0000 Y1.7500 Z-0.1000
G1 X-1.0000 Y-0.6000 Z-0.1000
G1 X0.0770 Y-0.6000 Z-0.1000
G1 X0.0770 Y1.7500 Z-0.1000
G1 X-1.0000 Y1.7500 Z-0.1000
G1 X-1.0000 Y-0.6000 Z-0.1000
G1 X0.1155 Y-0.6000 Z-0.1000
G1 X0.1155 Y1.7500 Z-0.1000
G1 X-1.0000 Y1.7500 Z-0.1000
G1 X-1.0000 Y-0.6000 Z-0.1000
G1 X0.1540 Y-0.6000 Z-0.1000
G1 X0.1540 Y1.7500 Z-0.1000
G1 X-1.0000 Y1.7500 Z-0.1000
G1 X-1.0000 Y-0.6000 Z-0.1000
G1 X0.1925 Y-0.6000 Z-0.1000
G1 X0.1925 Y1.7500 Z-0.1000
G1 X-1.0000 Y1.7500 Z-0.1000
G1 X-1.0000 Y-0.6000 Z-0.1000
G1 X0.2310 Y-0.6000 Z-0.1000
G1 X0.2310 Y1.7500 Z-0.1000
G40
G1 X-1.0000 Y1.7500 Z-0.1000
G0 X-1.0000 Y1.7500 Z0.1250
G0 X-1.0000 Y-0.6000 Z0.1250
G1 X-1.0000 Y-0.6000 Z-0.1000 F6.6
G41P0.25
G1 X0.0314 Y-0.6000 Z-0.1000 F6.6
G3 X0.0219 Y1.7500 Z-0.1000 I-2.2114 J1.1660
G40
G1 X-1.0000 Y1.7500 Z-0.1000
G0 X-1.0000 Y1.7500 Z0.1250
M5
M30

5816
General Mach Discussion / Re: general newbie questions
« on: November 03, 2008, 11:02:46 AM »
  Does this mean what I think it says, that I can load a Jpeg or BMP into LazyCam, and either it or Mach3 will convert it to something that they can generate Gcode from?

No, not what you think. LazyCAM will create g-code from the image, but the g-code will be for a 3D carving of the image, not a trace of it.

5817
General Mach Discussion / Re: general newbie questions
« on: October 31, 2008, 08:39:00 PM »
I don't think this will be very easy to do, the way you want to do it.

As was mentioned, raster to vector programs will probably not give you usable results. I've periodically looked at different ones over the last 10 years, and haven't seen one that I'd use. Of course anyone selling a raster to vector program will tell you how great their's is. They'll all convert your image to a vector file, and even the free ones will do it pretty well. The key, though, is that these conversions aren't very good when it comes to using them for cutting parts. When you zoom in closely to look at them, they are composed of LOTS of short segments, very jagged, and going in all different directions. A simple curve that could be drawn in a CAD program with a single arc, might consist of 100 segments in a raster to vector conversion. This is important, because when you create g-code form your .dxf file, the tool will follow the vectors exactly as they appear in the .dxf.

As for your other questions.

MasterCAM is about $10K, and is far more than you'll ever need.  A very good package for woodworkers is Vectric's V-Carve Pro. It's a very capable CAM program, does very good raster to vector conversion, V carved lettering and also has some basic drawing and vector editing. Support is second to none as well.

You'll also need a control program like mach3, which is what actually runs the machine.

Computer specs are not cumulative, however, if you want to use one PC for both CAD/CAM and machine control, be advised that while the machine is running, you really shouldn't be using the PC for anything else. Separate PC's is a good idea.

Tracing in CAD. What that means, is load the image into the CAD program, and manually draw right over it in your CAD program. The CAD program will have commands for lines, arcs, curves, and other entities. You use these to draw your shape, using the image as a guide.

I'd recommend that you start downloading demo and trial software and try to do what you want, and see if it's feasible. Feel free to ask a lot of questions along the way, because the learning curve may be steep.

I don't think you'll be able to get clean, tight joints on your inlays with your method. Ideally, you'd draw the whole thing in a CAD or design program and skip the raster to vector step. But that will require you to get good at a CAD or design program. :) In the meantime, I think you'll get better results by hand tracing in CAD, or hand tracing over your raster to vector conversion (to clean it up). Then, I'd print out scale drawings to use as templates to cut your veneer to, so that you can get as close a fit as possible.

5818
General Mach Discussion / Re: Bugs in Mach 3.42.015
« on: October 31, 2008, 01:35:59 PM »
1) could be due to your resolution. What's your steps/unit?

5819
General Mach Discussion / Re: Cutter Compensation
« on: October 28, 2008, 06:51:44 AM »
Other than a few minor bugs, it actually works pretty good for what I do, and I use it all the time.

5820
General Mach Discussion / Re: Cutter Compensation
« on: October 27, 2008, 09:02:00 PM »
The last is and example of incorrectly compensated geometry "tool to large for profile". My suggestion would be to trim the geometry at the second intersection like I had said. But it could ultimately just call an error and refuse to run the code. Anyway it would be a good idea to implement ether to prevent scrapping a part or parts by simply punching in a wrong tool table entry.



While either of those two options would indeed be nice to have, I wouldn't expect to see either. I think most comp users would just rather see the bugs fixed, and I really don't consider this a bug. In your "correct" solution, while you don't get a gouge, you're still not getting what you really want. Isn't it pretty simple to just not use the wrong size tool? :) Probably an awful lot of work for Brian to check for tool table typos. :)

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