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Art and list-at-large: I am experiencing a slow down in performance at 35kHz (and incredible slow down at 45kHz) in Mach 2 as compared to 25kHz. Can someone tell me what is happening and how to remedy the situation. Running a 1.3 GHz machine dedicated to Mach2 - nothing else running, use of Gecko 201's, and only rapids of about 10mm/sec. Also a couple of possible bugs: - upon M30 reset, rewind all axes ok except X that does not reset properly - variable speed of incremental jog, sometimes slow, sometimes same speed as continuous. Thanks in advance. Tom Hess

Hi Art, I'm using spindle Step/Dir with V7.2, just changed from M1 where spindle was OK, this is mill. Using 25Khz kernel freq, calibrated FotV at half speed VFD op = 60hz,increase speed to 3/4 output = 83hz, increase to max output = 87hz. (FtoV has been checked for linearity using separate function generator). Looking at the ouput of the D-FF pre-scalar at 1/2 speed frequent, but random, change in output from 80uSec to 50uSec, at 3/4 speed pulses change from 55uSec to 30uSec, not possible to measure pulse train at full o/p - too random. The output of the VFD dithers .2 to .3 in the Hz window at all ouput frequencies. Hope this helps Bernard

Hi, When I load my second or more g-code file, the extrema is incorrect, the only way I have found to correct it is to restart mach2. Regenerating the screen does not help. Any ideas? Thanks Todd

Art, I'm gradually trying to sort things out here. When I first noticed problems I was running the kernel @35Khz, I then switched to 25Khz and got the figures I gave you. I have now re-started M2 and get figures much more in line to what is expected, there are still some anomolies, for example at 3/4 spindle speed there are intermittent missing pulses, I can see this as I have a D-ff as a pre-scalar and instead of a regular 1:1 square wave there are random 1:2 pulses, these correspond to missing pulses in the step train and a lot more variation in the VFD frequency. Changing the kernel to 35K and I am back to the original conditions. This gives rise to 2 questions. 1) It seems necessary to do a program re-start after changing kernel frequency. Can you confirm? 2) I am running a HP Pavilion 650MHz P3, is this fast enough to run at 35KHz, what is the symptoms when you run out of steam?, the other 4 axis seem to be working OK. The Diagnostics page give a pulse freq of 36119 and CPU load = 0%, worst case 0.000158. Bernard

Hi Art, Is it possible to combine the spindle step/dir axis with the rotary A-axis? The reason is that I'm thinking of using a servo motor as the spindle drive, but occasionally use it as an axis for threading. Will it work if I use the same output pins for both axis? Thanks, Peter Homann mailto:Peter.Homann@... Adacel Technologies Limited, 250 Bay St, BRIGHTON, 3186, AUSTRALIA http://www.adacel.com <http://www.adacel.com> Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960 Mobile 0421-601 667

Hi Tom,i was wondering if i could ask you some questions on the THC setup,i have decided to modify my machine and add a z-axis,can you help me on how the z axis is driven and how much travel should i give it.Thank you Scot UK

Well I thought I was home free and over the hump when I got the three axes running off one port on the laptop (Compaq 1510 2.2Ghz P4) with Mach2 RC2. This a router running simple rectangles, either multiple cuts to break through or using tabbing and cutting the tabs after the first pass. In either case I'm losing the zsteps in the last cut, so if I leave tabs 1/8" thick and run I lose Z .125 with every tab. If I single step through the code I lose nothing. I'm posting out of BobCad and MasterCam (using VERY simple code, g90, g0, g1,g03). All movements are in absolute except I and J in incremental. I'm only feeding at 50 IPM at 2k steps/inch at Z and 120 IPM at 1.02K steps inch in x and y, well within the capabilities of 25K pps. I can single step the drives at anything up to 400 IPM x-y with an indicator and it doesn't drop a step, put it an NC file to run and everything goes to hell unless I single step that. Has anyone been through this? Frank Carpenter

I have in my possesion a KB electronic model KBMM-225D controller, and the opportunity to get a treadmill PM motor(90-130Vdc@...... full load amperage??)its pretty close to be rated within the controllers limits(16 A average @90Vdc). The guy that has it tells me that it more than likely wont work with an SCR type controller.I dont see the distinction ...I thought a PM motor was a PM motor, and as long as the motor matches the Voltage/amperage of the controller, that the 2 were compatible. I was wondering if anyone could tell me if the motor will work with the controller before I purchase it.... and please explain to me why it wont(if thats the case) so Ill have a better understanding of it all and can match a motor to the controller . Thanks all for your time and patience Regards, Jim

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the mach1mach2cnc group. File : /FtoV with Pre-scalar.jpg Uploaded by : bwr2fixit <bwjarandall@...> Description : FtoV with pre-Scalar You can access this file at the URL http://groups.yahoo.com/group/mach1mach2cnc/files/FtoV%20with%20Pre-scalar.jpg To learn more about file sharing for your group, please visit http://help.yahoo.com/help/us/groups/files Regards, bwr2fixit <bwjarandall@...>

Have you cut any threads with the latest Mach2? Jerry

Hi Does anybody know of any software (e.g. keyboard remapper, mouse hot keys functions etc.) that will turn clicks on an IntelliMouse's scroll wheel into keystrokes? It potentially seems to be an excellent interface for feedrate override if only one could generate some suitable keystrokes to trigger the Mach2 override control buttons. John Prentice

Hi All I am trying to improve the macro section in the Manual and must share a bug in the manual and a feature in Mach2 with you. My "bug" is in the definition of the Param3() function in Appendix 5. Param3() actually gets the value of the S word in a macro call e.g. if macro M55 contains a VB Script line "valu = Param3()" and the macro is called in a part program by "M55 S3000" then variable "valu"will be set to 3000. The manual (Rev A1) says it is the L word that corresponds to Param3. The "feature" is that the S word is checked against the current pulley setting by Mach2 before it is passed to the macro. If it is too high or too low then it is not passed. You need to beware and only use this word to pass a valid spindle speed to a macro. P & Q will pass any value. I hope the next version of the manual will have some helpful macro examples in it. Best wishes John Prentice

I was wondering if the possibility is available to separate the limit switches and the home switch. I seriously believe that there is a serious safety concern when the limit/home function is the same contacts. My experience in equipment is that the limit switches are part of the E-STOP ladder and the home position is separate and that is to prevent damage to the equipment. I would think as hobbiests we need the protection this would give us. If necessary I think the activation of LPT2 is an issue to consider. ART, Thanks for the great product.

That's it; I don't think I'm going to post from Yahoo anymore... How were the previous two for my first post... :-( I need to buy a new computer so I can run Mach1/2, and am looking for recomendations. I'm sure it's been discussed, but after an hour of searching the archives, I've come up dry. It seems that a 2.2 gig celeron is a good price breakpoint. Anyone have experience with this processor running Machx? Is it good enough to run win XP home/pro/Win2k? I'm a win98 user, so I don't know how much ghz is required to run these operating systems and cad programs. Is it worth $100 to make the jump to a 2.4GHz p4? What about operating systems? What's the difference (to a cad/cam operator) running XP Home, XP Pro, or Win2K? Is it worth $70 to upgrade? Thanks for putting up with my goof posts, and my newbe questions. I've seen Mach2 running a Taig, and am now willing to spend as much as my Taig for new computer/software to make mine run that nice. (CNCPro on a P1 around 233 MHz current configuration). - Steve

Here are a few problems with toolchanges Lathe tooltable overwrites Mill tooltable Entries are listed as Z,X rather than X,Z? Using Jog screen to touch entries off always overwrites tool 0 even if a different number is typed in tool number box. How is the touch correction supposed to work? My job X0, Z0 is center of stock diameter, say 30mm from end, and all my gcode coordinates work from there - if the stock is 10mm diameter - how do I let mach2 lathe know this? Also have you got a list of supported G & M codes for lathe, I've noticed if it doesn't recognise a Gcode it simply skips that line - that could be nasty - surely it should error and stop? -- Steve Blackmore

How about mapping the wheel of a wheel mouse for the feedrate override. It would be easy to use. Once you have a hold on the mouse, you can go back to looking in the work zone. (Good human engineering) Maybe a toggle between FRO and Spindle Override? Hey Art, can you put that one on the to-do list? Dave G functions etc.) that will turn clicks on an IntelliMouse's scroll wheel into keystrokes? only one could generate some suitable keystrokes to trigger the Mach2 override control buttons.

Any ideas on where I can buy a PCI parallel port card, inexpensively ($10 - 20)that is guaranteed to work with both Windows XP and Win2000. Most of the PCI cards are around $30 plus shipping when bought new and the cards on ebay have no guarantee that they will work on 2000/XP. I bought a dual parallel PCI card on ebay and it only has drivers for win/95/98/ME and the manufacturer says they aren't going to have drivers for it for 2000/xp. Any information would be appreciated. Thanks Tom

Hi All, A warning to anyone using a LM2907/2917 Frequency to Voltage converter for spindle control. The chip data sheet does not specify an upper frequency limit, I have found that it is very non linear above about 13KHz, I did not realize the problem with Mach1 because I was using a D-FF as a pre-divider, however when I set up Mach2 for a Kernel speed of 35KHz I found that at above half spindle speed I was getting very strange results. The answer was to use the second D-FF on the chip, so there is now a divide by 4 pre-scalar to the FtoV. This modification should be good for M2 up to a Kernel frequency of 45KHz. Apologies to Art for any time he wasted on another non M2 problem. Bernard