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Messages - turmite

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131
General Mach Discussion / Re: Cannot wait to start !!!!
« on: August 18, 2006, 01:08:15 PM »
Hi Andrew,

This is the reason I asked about your use parameters. :) I am assuming full size engine parts and probably old 4 cylinders??

I would have to agree with Brian here that bigger is better, if, there is any chance you will actually mill the aluminum parts from billet. Let's start with; Are you intending to use a metal milling machine and retrofit it to cnc? This is absolutely the path I would take if you are intending to mill blocks of al. Now this is not to say that you can't build a machine heavy enough and stiff enough to do the job, but you can't do it as inexpensively as you can retrofit a milling machine. Again, depending on your answer, the advice from em or anyone else could be quite a bit different.

Mike

132
General Mach Discussion / Re: Cannot wait to start !!!!
« on: August 18, 2006, 09:13:35 AM »
Hi Andrew,

I think the first thing you need to do is set the parameters for what you want to do with the machine since the advice on the hardware will vary depending on what they are.

As far as the Geckos there is no question in my mnd I would go with the 202 drives. According to Mariss's tests, they are basically indestructable. That's the kind of equipment I need! ;)

As to the board, I use a Campbell board and will buy from him again, simply because of the great support he offers. That is not to say the other guys don't offer good products or support. I have no other experience except with the Campbell board. You might say I am a creature of habit!

Mike

133
General Mach Discussion / Re: G54 offsets questions
« on: August 14, 2006, 03:32:28 PM »
Hi Graham,

I understand that about G54, but unless I am mistaken, an active G92 will take precedent over the G54. Meaning of course, that whatever the G92 set the dro's to will remain persistant until cancelled. I did get a reply from over on the Zone from a fella that I have a lot of confidence in and he basically told me that till I got my unstable homing issue corrected  in the y axis that the G92 was still probably gonna be my best bet.

Mike

134
General Mach Discussion / Re: G54 offsets questions
« on: August 13, 2006, 10:27:39 AM »
Thanks Graham,

Now I understand a little better. I have just changed to mach3, or actually in the process, and wanted to go ahead and change all my system to better work with mach3........but for now I'm, going to keep the G92. I don't like it due to it being active till cancelled. I have on occasion had to quit a program in the middle somewhere and forget that the end of the program had not canceled the G92  command only to ruin a part or bit.  Thanks again for your help.

Mike

135
General Mach Discussion / Re: G54 offsets questions
« on: August 12, 2006, 10:42:09 PM »
No one? :'(

136
General Mach Discussion / G54 offsets questions
« on: August 10, 2006, 04:22:02 PM »
Hi guys,

This is a copy and paste I did over on cnczone. I wanted to post it here as well since Mach users will understand the software better.

"Hey guys,

There was a thread a few days back that asked about G92 and immediately the thread went to why it shouldn't be used and the G54 up codes should be used instead. I have used the G92 for three years now but see an immediate need to move on. I'm gonna need some help on this.

Let me set the stage. I do not have an industrial strength machine, but it is all I have presently. I use Mach2/3 for my controller and it basically supports all the offset codes. I have a 4th axis that runs parallel to my x axis and I have to be dead centered over the a axis center or my parts are trash. Here's the problem. I use limit switches to set my home positions and for the most part they are within about .005" which is close enough. You will notice I said " for the most part"! My y axis seems to move from time to time and this is the axis that has to be centered over the a axis centerline. I have a known distance from the faceplate of the a axis in the x, which the tolerence really doesn't matter as long as the machine returns to 0 each time after the initial reference move. So far that is the case. Z is set using a tool set switch with is within the .005" range too. To get around the y problem I have written a small program that cuts a slot 1" long from either side of a piece held in the a axis and rotated 180 for cuts to be made from either side. I then measure the difference of the cuts, divide by 2 and move the y axis to the correct dro reading.

Now for sake of time let's assume my known correct position is:
x27.200y108.4724z-2.125a0.000 BTW this is my know position today.

The tool length set switch uses a G92 to set the tool tip at a know distance from the centerline of the a axis. This macro also sets the z axis dro to 0.000 G92 is modal so it is in effect till it is canceled, but presently only in the z axis.

All my programs are written from x0.00y0.00 with whatever z I need, and there is a G92X0.00Y0.00Z0.00A0.00 used about 5 lines into my programs to set all dro's to zero.

With this info, can anyone take the time to explain in very plain English how to do this with the offsets other than G92. It is possible to have a new tool set macro that does not use G92, so please take that into consideration.

I know this is more like a book, but I only want to have to learn this stuff one more time! Thanks in advance to anyone willing to help.

Mike
__________________
No greater love can a man have than this, that he give his life for a friend. "

Any help would sure be appreciated.

Mike

137
General Mach Discussion / Re: Non persistance when doing config setup
« on: July 31, 2006, 12:10:38 PM »
Hi Brian, Art and or anyone else who might know. ;D

I need to be able to manually override my persitant limit switches and can't. I finally found the check box on the settings page.....thinking all this time it was in the congif :-[, but I cannot get a green led. This is all I need to be able to go ahead with the test. I may not actually since I not over the strep throat yet, but am getting there.

Mike

138
General Mach Discussion / Re: Non persistance when doing config setup
« on: July 28, 2006, 11:48:24 AM »
Thanks Brian......sometimes I get tunnel vision :-[

Mike

139
General Mach Discussion / Re: Non persistance when doing config setup
« on: July 28, 2006, 11:30:13 AM »
Brian I made the change, closed Mach and they stayed in place. Then I changed the motor pins to get it referencing in the correct direction and that screw my jog directions up. Is there a chance that the referencing code is reversed?

Mike

140
General Mach Discussion / Re: Non persistance when doing config setup
« on: July 28, 2006, 08:49:19 AM »
Brian are you saying close Mach before I test a jog or anything?

Mike

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