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Messages - mayhugh1

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1
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 04:53:43 PM »
It's interesting because one of the options in the  General configuration panel in the Turn profile is to opt for a G49 and/or a G40 when the end of a program is encountered.  At first I thought this might be related to my problem and what you were looking for in my profile, but it didn't seem to help.  - Terry

2
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 04:24:59 PM »
Hood,
   So are you saying that you too don't think g49 does anything  in Turn?
Thanks,
Terry

3
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 03:59:17 PM »
Another interesting thing is how (or if) G49 works in MachTurn. I don't believe it does anything. For example, I can reference my tool1 and go ahead and set the offsets for tool2. If I then switch to tool2 (enter T2 in the tool dro) I can see the dros change to reflect the offsets for T2 compared with T1. If I MDI G49 nothing happens on the T2 dros. In the mill software, the dros change to reflect the cancellation of the length offsets. In Turn there is no apparent effect. It seems the only way to cancel the length offsets is to MDI T0101 or MDI T0000 or to enter T0 or T1 into the tool dros. I see many Turn programs that start out or end with a G49 in the machine setup block, but does it really do anything? - Terry

4
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 02:30:42 PM »
Hood,
     I've gotten into the habit of re- referencing both axes because my lathe isn't all that rigid and I've found that during a long cutting program the x reference can wonder around several tenths and if I reset the x with each new workpiece I can keep the accuracy a little better under control. Also due to deflection, if I don't run my skim cut at the same doc as my final finish cut on the part, I won't be accurate on the final finish diameter. When I tried to reference my x for my second and third tools, I jogged step at a time up to the workpiece diameter until (by rotating the spindle by hand) I start to rub off the machinists dye on the diameter of the skimmed part with the tool to be referenced.  Maybe my workflow isn't what Mach is expecting and I'm running into some subtle problem with the software. Rich - I have to study your reply more carefully. There's more in there that I have to think about even though I have read that appendix several times already.
Thanks all, - Terry

5
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 04, 2013, 05:06:35 AM »
Thanks for looking.
Let me repeat my process and maybe be a little clearer:

I type 1 into the T dro on the Manual screen. I insert my workpiece and take a skim cut on the end and then set the z dro to 0 on that same screen. I then take a skim cut on the diameter and then measure it and then set the x dro to that value on the same screen.

I then type 2 into the T dro on the manual screen and then touch tool 2 to the end of the workpiece. I enter the offset screen and type 0 into the z part-set dro and then hit the 'touch' button. This places the z offset into the tool table for tool 2 and I verify this by looking into the tool table. The offsets for T1 are both zero as I verify in the tool table also. I then go back to the manual screen where I can jog t2 to touch the diameter of the workpiece. I then go back to the offset screen and type the measured diameter into the x part-set dro. And then I hit the 'touch' button to set the t2 x offset in the tool table and I verify it.

 I then repeat the above for tool 3.

I run my program and it runs to completion as expected.

I put in the new workpiece and re type 1 into the T dro on the manual screen. I jog the tool to touch the end of the workpiece and then I zero the z dro on the manual screen. I take a skim cut again on the new workpiece and enter the new diameter into the x dro on the manual screen.

I run the same program again and usually the tool t1 starts cutting at the wrong x or wrong z or both.  I can re-reference the t1 in both x and y again a maybe that will correct the problem.

There is never a problem with running the program for the first time after a fresh reload of Mach. There is almost always a problem with running it a second time if a new workpiece is chucked and t1 referenced to it.

I never use the home buttons as I don't know what they do. And I seldom use the part set dro's on the manual screen as I usually just type directly into the dro's on that screen

Terry

6
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 06:23:22 PM »
and the m6end

7
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 06:22:51 PM »
Hood,
    Here is the m6start:

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General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 04:46:26 PM »
Here is the xml:

9
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 04:45:28 PM »
Hood,
    Thanks for your help - I really appreciate it. Here are the files you asked for. - Terry

10
General Mach Discussion / Re: Please help with lathe tool tables
« on: November 03, 2013, 12:34:49 PM »
I found Hood's video while I was in the middle of trying to troubleshoot the problem and I seem to be doing everything that he is. My problem seems to be changing the master tool reference for some reason. Thanks, Terry

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