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Re: Version 5.0 (encoders)
The FPGA is certainly the lowest cost and simpler solution to go. Withtout
an FPGA you will need a PCI chip on the board >> higher integration cost. No experience for PCI design. I think the complexity is very high, not really for the card, but for the win32 WDM driver. The true solution is to wait for the USB gecko 2003, and to implement this in it. I think the market is too small to developpe a specific PCI card for this. And PCI will certainly change or disapear in the futur. USB will certainly stay stable for some long years (as RS232 did). ISA cards are legacy now. New PCs don't have ISA slots since a couple of years. Regards, Olivier. |
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Re: Version 5.0 (encoders)
--- In mach1mach2cnc@..., Robin Szemeti <list@r...> wrote:
What is probably not possible to do in Mach2 One rather simple approach to this would be to adapt the idea of the so-called Kulaga/Mauch DRO card for Mach2. This not-too-complex ISA card uses one (or two) dedicated encoder counter ICs, LS7266R1 from LSI/CSI. Each of these can read two encoders at a very high speed, 17 MHz in quadrature mode. I've understood that EMC can use this DIY card for encoder feedback with steppers. Perhaps it would be possible to design a simple PCI card having three LS7266 counters for the six axes that Mach2 can control. For a three/four-axis machine the third counter IC would be optional, and could be added afterwards to an empty IC socket if more axes are added to the machine. Of course all this could be done with one FPGA chip, but these double- counter chips would be a very good start and possibly easy to implement as well. Does anyone have experience on card design for the PCI bus? Cheers, Vesa -- Vesa T. Korhonen Corhoin Wizardonik Customworks, Finland |
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Re: G41 (was: First drawing software)
stevenson_engineers
--- In mach1mach2cnc@..., "rrc62_03782" <rrc62@a...>Why bother, No arrows, no need to bother, no extra work. Only arrow I have seen in the last 5 years is on an old re-run of Robin Hood. John S. |
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Re: G41 (was: First drawing software)
This is very true, some programs insist that you have arrows on allI like the arrows. Makes it very clear at a glance which direction everthing is going. To change direction, just click on the other side of the arrow. No hoops, no big deal. If clicking the toolpath is too complicated, you can select the toolpath or toolpaths and reverse direction with one menu selection. Ross |
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Re: G41 (was: First drawing software)
stevenson_engineers
--- In mach1mach2cnc@..., "Donald Hansen" This is very true, some programs insist that you have arrows on all the lines to show the way they were drawn and if not in the correct order you then need to jump thru hoops to re organiase the ay they need to go. As Michael has stated with Dolphin this isn't nessesary and the arrows went out with Col. Cusler. John S. |
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Re: G41 (was: First drawing software)
Steve Blackmore
On Sun, 07 Mar 2004 18:10:52 -0000, you wrote:
My point is, why all the struggling? We spend endless money onI think the issue here is that he does not have a good CAD?CAM program. I can have Hardware & tooling but never think about CAM programs! IMO - Just as important to have a decent cam proggy as all the rest of the kit! Makes life so simple, forget vecors, what direction the arcs go in etc, just draw or import, output as Gcode and job done in less time it's taken to discuss this on the list :) -- Steve Blackmore |
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Re: G41 (was: First drawing software)
Michael,
That's great because that used to be a real pain in the neck and lower when bringing autocad files into Smartcam. Don --- In mach1mach2cnc@..., "Michael Milligan" <zen11777@z...> wrote: Donaldbe generated in the ORDER that they appear in the drawing file. TheCAM program will pick up the SAME ORDER from the dxf file. So if aCAM program so that the cut begins at the top right, goes to the topthe top right (or any desired path). In the above case, the cuttercomp would all be left (G41)if inside and right (G42)if outside. Thethe direction of the cut for EACH line in the path as indicated in thetool path manually or in drawing file because of the variability incutter size (what you have and resharpened undersize cutters). Good luck.wrote: alwaysthe right facingwillthe direction the cutter was traveling, then ... THEN I could seeit asalways being to the right.... ok ok I think I'm starting to graspthis. subject=Unsubscribe>toolconfuse you. of <> Service. |
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Re: G41 (was: First drawing software)
Michael Milligan
Donald
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I cannot speak for other CAM packages but with Dolphin it does not make any difference how you draw the lines, Arcs, circles. The DXF Import will construct contiguous contours from the geometry in the file. If the contour is in the wrong direction then the user can simply choose to reverse it. Regards Michael Dolphin Cad Cam Systems Ltd -----Original Message-----
From: Donald Hansen [mailto:dhansen45@...] Sent: 07 March 2004 13:07 To: mach1mach2cnc@... Subject: [mach1mach2cnc] Re: G41 (was: First drawing software) One other thing to consider is that the lines in the dxf file will be generated in the ORDER that they appear in the drawing file. The CAM program will pick up the SAME ORDER from the dxf file. So if a square is being cut the order of the lines can be changed in the CAM program so that the cut begins at the top right, goes to the top left, then the bottom left then the bottom right and then back to the top right (or any desired path). In the above case, the cutter comp would all be left (G41)if inside and right (G42)if outside. The important thing is to make sure that the cutter path is all sequential and that you determine the left or right by looking in the direction of the cut for EACH line in the path as indicated in the previous posts. Sounds like you understand this from your post. Cutter comp really makes things alot easier than changing the tool path manually or in drawing file because of the variability in cutter size (what you have and resharpened undersize cutters). Good luck. Don --- In mach1mach2cnc@..., "Jeremy Taylor" <jt@j...> wrote: the right of the line when it is top left, but when it moves to top right,the cutter would need to actually be on the left of the line. Look at themachine from where I SIT.time the cutter changed directions, I was swung around so that I was alwaysfacing the direction the cutter was traveling, then ... THEN I could seeit as always being to the right.... ok ok I think I'm starting to graspthis. tool corneris moving forward. theand move to top right the cutter will always be to the right of line no matter what side it is cutting. _____ Yahoo! Groups Links * To visit your group on the web, go to: * To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... <mailto:mach1mach2cnc-unsubscribe@...?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of <> Service. |
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Re: G41 (was: First drawing software)
piggy
if you will walk behind the cutter as it makes its rounds of the part thenWithout the ability to control, or at least know in the drawing program, which direction the vectors are drawn, it will be very difficult to use compensation ............................................................................ ................................................. well since i use no drawing program and i hand code everything , then i can not respond on this lol. maybe one day i will be smart and rich enough to have a drawing program ( CAD ) DON --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (). Version: 6.0.581 / Virus Database: 368 - Release Date: 2/9/2004 |
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Re: G41 (was: First drawing software)
I think the issue here is that he does not have a good CAD?CAM program. I can have a toolpath ready to go for the same part in 10 minutes using Vector as well. His problem is that he has no way to control or view vector directions. Without knowing that, how do you know which side to offset to? The soution of course, is to offset the vectors in the drawing. Then is doesn't matter which direction the cut goes. Ross |
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Help with screen editor stuff...
hi all
does anyone know if it is possible to set up m2 for this homing sequence? : 1. start machine 2. start m2 (and hit reset) 3. jog (or with an mdi command, move) the spindle near to the limit switches (x+, y+, z+) 4. then, with one single button click, move all 3 axis at a slow feedrate until they hit the switches, then backs away a few mm?s, and finaly updates/resets the machine dro. is there already any oem code for this? is it do-able? thanks jens |
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Re: G41 (was: First drawing software)
Steve Blackmore
On Sun, 07 Mar 2004 15:43:50 -0000, you wrote:
--- In mach1mach2cnc@..., "Jeremy Taylor" <jt@j...> wrote:I've just cut a panel in 2.5mm Aluminium containing 2 largeThis is what I have been doing, and particularly on complex stuff, I'dThe way I expained it to you is the way everyone here explained it to me when I got rectangular cut outs, 4 small rectangular, 4 round cut outs and drilled 18 3mm holes - whole thing from drawing to maching took less than an hour and 10 mins using Dolphin. 50 mins of that was machining! -- Steve Blackmore |
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Re: G41 (was: First drawing software)
if you will walk behind the cutter as it makes its rounds of the part thenWithout the ability to control, or at least know in the drawing program, which direction the vectors are drawn, it will be very difficult to use compensation. The only way he'll be able to tell for sure which direction the vectors are drawn would be to run the part and see what happens. I don't see any way in Corel to view or change vector directions. Once he knows for sure that a circle is cutting in a CCW direction, he can go back and put in the proper compensation. For a complex program, this would be a nighmare. Thats why I use CAM and prefer to do my part offsets manually. Ross |
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Re: Version 5.0
<<You'd need a proper dedicated counter and some way of reading
it I guess ... and even then, what do you do if they are in error? All I can see to do with a stepper is abort the program, recovery could be difficult.>> There is no reason the next gecko 2003 couldn't support this. the hardware FPGA architecture will give enough power for 20 axis or more... in only 1 cost effective chip (about 5$ for cheaper ones, in the Altera Cyclone family for example). The nice things in these circuits is we can have dedicated DSPs modules, 32 bits controlers with C or assembler code, and wired logics in the same chip. All what we need for a sophisticated pulse engine with closed loop feedback at a low cost. <<producing machining strategies is the job of an external application ... >> These applications are professional ones isn't it ? More they need a specific (serial ?) interfacing with professional probes. Do you know a hobbist priced one for craftsman ? Olivier. |
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Re: G41 (was: First drawing software)
--- In mach1mach2cnc@..., "Jeremy Taylor" <jt@j...> wrote:
This is what I have been doing, and particularly on complex stuff, I'dThe way I expained it to you is the way everyone here explained it to me when I got started....even Art... The real problem with profiling is not the tool diameter compensation, but the tool path ordering so that cutouts within a part get cut before the part gets cut out. Unless you are using bridging, once the part outline is cut, any cuntouts within the part can not be cut. This is where your CAM program will come in handy. There is a way around this. Since Mach2 now recognizes layers, put all of your cutouts within parts on one layer and the part outline cuts on another layer, then cut the first layer first. The only way to know for sure which way to compensate is to know for sure wich direction the vector is going. In Vector CAD it's real easy to tell which direction everything is in. In Corel, it depends on the way you draw the vector, but there are no indicators to tell you for sure which direction the vector is running. If you have a circle and you need to compensate on the outside and the vectors are in a CCW direction, you would compensate to the right. If the the vectors were in a CW direction, you would compensate to the left. If you draw a circle and drag the mouse from the left to lower right, the vectors will be in a clockwise direction, If you drag from right to left, they will be counterclockwise. The same applies to lines, but when drawing a box, It comes out in the same direction regardless of how I draw it. Ross |
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Re: G41 (was: First drawing software)
addaeng
Hello and Huray, its my first post to this group.
Great group and all here are fantastic but most of all Art. Now, the offset thread. I thought I would post my thoughts on this. I have been doing WEDM for years and had the same kind of trouble in the beginning. The way that I see it is this. I look at the way that I am going to cut. Either clock-wise or counterclock-wise. That is the first thing to deal with. Wether or not it is inside(die) the (closed) shape or outside(punch) is the second. With that in mind you have Clock-wise, inside - g42 / right Clock-wise, outside = g41 / left Counterclock-wise, inside = g41 / left Counterclock-wise, outside = g42 / right If I am cutting a line (open) then I need to know what side of the line I want to be on and the direction that I want to travel (or where I want to end). That tells me wether or not I want left or right offset. It was fun in the begining for me (not) because I could never "see" the tool move to the left or right of the planned path (its only .004 diameter and tough to see) If you are using a graphics cam program that shows geometry and toolpath then the point is moot. If you get it wrong just reverse it. I hope that I have helped and not just stirred up the nest. Brian --- In mach1mach2cnc@..., "Jeremy Taylor" <jt@j...> wrote: OK - so how do I determine which side of my drawn lines gets theinside of the cut, IF I'm forming a piece, I'd need the compensation on theoutside, however I cant seem to figure out how to tell Mach2 which I want todo, doing as you described in the previous reply.and hence my hand redrawn designs whit the lines falling on center ofthe cut. And my lines are set back 1.5mm so that the end result is what Ineeded.
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Re: Is charge pump needed???
Robert Campbell
Thomas,
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If you are turning any pumps or motors on/off with M commands then I would suggest that you use the charge pump. In the event of a power failure, everything will drop out. The main thing is safety. Do you have to use the charge pump, the answer is no, but I am glad that Art included it. Bob Campbell Bob@... www.campbelldesigns.com Breakout board THC board sets CNC router plans Stepper Motors ----- Original Message -----
From: "Les Newell" <les@...> To: <mach1mach2cnc@...> Sent: Sunday, March 07, 2004 6:48 AM Subject: Re: [mach1mach2cnc] Is charge pump needed??? You don't have to use the charge pump feature. It is simply an addedafter the boot bring power to the rest of the system, Campbell breakout board, Gecko's, encoders etc. Will a charge pump still be needed?
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Re: G41 (was: First drawing software)
One other thing to consider is that the lines in the dxf file will be
generated in the ORDER that they appear in the drawing file. The CAM program will pick up the SAME ORDER from the dxf file. So if a square is being cut the order of the lines can be changed in the CAM program so that the cut begins at the top right, goes to the top left, then the bottom left then the bottom right and then back to the top right (or any desired path). In the above case, the cutter comp would all be left (G41)if inside and right (G42)if outside. The important thing is to make sure that the cutter path is all sequential and that you determine the left or right by looking in the direction of the cut for EACH line in the path as indicated in the previous posts. Sounds like you understand this from your post. Cutter comp really makes things alot easier than changing the tool path manually or in drawing file because of the variability in cutter size (what you have and resharpened undersize cutters). Good luck. Don --- In mach1mach2cnc@..., "Jeremy Taylor" <jt@j...> wrote: the right of the line when it is top left, but when it moves to top right,the cutter would need to actually be on the left of the line. Look at themachine from where I SIT.time the cutter changed directions, I was swung around so that I was alwaysfacing the direction the cutter was traveling, then ... THEN I could seeit as always being to the right.... ok ok I think I'm starting to graspthis. tool corneris moving forward. theand move to top right the cutter will always be to the right of line no matter what side it is cutting. |
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Re: G41 (was: First drawing software)
piggy
if you will walk behind the cutter as it makes its rounds of the part then
you will see whether to use g41 or g42 . is the cutter to the right of the line it is cutting ? is the cutter to the left of the line it is cutting ? part external cut lines will use different comp when running ccw or cw , same for internal cut lines. don t. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (). Version: 6.0.581 / Virus Database: 368 - Release Date: 2/9/2004 |
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Re: Is charge pump needed???
Les Newell
You don't have to use the charge pump feature. It is simply an added safety feature. If you are always careful about your switch on and switch off sequence then it is not essential.
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Les Thomas Powell wrote: If I have seperate power switches and power up the computer first then after the boot bring power to the rest of the system, Campbell breakout board, Gecko's, encoders etc. Will a charge pump still be needed? |
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