Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: sparkyengle on February 20, 2014, 10:39:29 AM
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Hello. I am having an issue trying to make some threads on my lathe. The lathe will make a correct pass with the correct pitch on the first pass. On its return back to the start of the threads, it is just as slow as the threading pass. When it starts the second pass, it goes extremely fast, ruining the first cut. when it returns, it again moves at a very slow pace. I tried to install an older version, loaded only the necessary info to get the lathe motors to move properly, and it did the same thing. Please help as this is for work, and I have sold management on mach and all of its capabilities.Thanks in advance.
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Hi Andy,
Do you have a licensed version ?
Might post your xml, might see something there.
How did you generate the threading code ?
Wizard ?
Might also post the gCode file that is giving you the problems.
Russ
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Yes, it is a licensed version. The Code came from the simple threading wizard.
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I see you have "Timing" enabled on the same port and pin as the Index.
I think you want Index ONLY .... do not use Timing.
See if it makes a difference.
Russ
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I've tried it both ways. Same results.
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Is your rpm constant ?
It looks quite slow @ 170.
Might change it to 600 - 1000 or so and run it again.
Russ
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I ran it around 400rpm, same results.I used to thread around 90rpm with no issues.
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I would suggest you have a look at Threading on The Lathe write up which can be found in Members Doc's.
After reading it and doing some testing report back on how your doing.
Note the configuration settings, testing methods, and also use of the threading wizard in the write-up.
RICH
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Does your RPM show a consistent speed?
What is the Frequency on Diagnostics page, ie is it stable and very close to your kernel?
Hood
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Yes, the RPM's are very consistent. What is bugging me is the fact that the first pass is fine. After that, it acts strangely. The return pass is always slow for some reason. I believe it is moving at the same speed as the first pass. Even when the tool is going fast on the cutting pass, it goes slow on every return pass. I am running my spindle at 170 RPM's. My Kernel is set at 25Khz. I don't think this is the issue because that has never changed. I ran the driver test, and all was good. I looked at the Thread wizard wright-up and that is where I went for my configuration settings after i noticed the first issue. Still no change. I hope this makes sense. Thanks.
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What is the Frequency on Diagnostics page, ie is it stable and very close to your kernel?
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What version of Mach are you running?
RICH
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What is the Frequency on Diagnostics page, ie is it stable and very close to your kernel?
Hood
Again, "What is the Frequency on Diagnostics page, ie is it stable and very close to your kernel ?"
Are you sure your license is legit ? If not, attempting to thread will surprise you.
Russ
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I'm sorry, but I'm not quite sure what you are asking for on the diagnostics page. If what you mean is the actual frequency or speed of the spindle, it is consistent and steady at 170 RPM's. As for my kernel speed, it is set to 25000hz. I am running the latest version of Mach(R3.043.066), and yes it is a fully licensed version.
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:)
You might load the Mill screen (1024.set) temporarily and go to the diagnostics screen there.
This is what Hood is looking for.
Russ
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Sorry about that. I was strictly looking at the Mach3 turn Diagnostics screen. I am currently away from my computer at work. I will check this as soon as I get in tomorrow.Thanks again. Andy.
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No problem Andy, should have made mention of that earlier on.
I'm having threading issues on one lathe myself right now.
Looking like a bad PC.
My kernel is also at 25000, but the freq. is over 44000.
Giving me a fit.
Wish ya luck,
Russ
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Well....I went to check my frequency on the system and...DEAD. I'm assuming it was the power supply on the computer that gave out. Long story short, I grabbed a newer computer that runs XP pro and it now seems fine. Threads the way it should again. Thank you all for your help. I can finally show the Higher-ups the capabilities of Mach. You guys are the best. :)