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Author Topic: units per min vs units per rev  (Read 8799 times)

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units per min vs units per rev
« on: March 20, 2009, 09:41:04 PM »
Iis there a way for the wizzards to be changed from units per min to units per rev

I work with very small carbide end mills and even with a feed of .01 unit per min the end breaks i need to cut at 6000 revolutions .0002 per tooth.

Thank you for your time

Marcel Beaudry
« Last Edit: March 20, 2009, 09:48:59 PM by marcel beaudry »

Offline Chip

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Re: units per min vs units per rev
« Reply #1 on: March 21, 2009, 03:27:06 AM »
Hi, Marcel

If your "Step's Per." value's are More than 10,000 in Motor Tuning, You should be able to move as slow as 0.0001 in per min. F0.0001 value.

Hears a Screen.set that shows the F setting, Now that is Slo--------w.

Chip

Offline jimpinder

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Re: units per min vs units per rev
« Reply #2 on: March 21, 2009, 05:39:47 AM »
Am I missing something here, or is my maths all wrong.

If you want your tool to advance by 0.0002 (I assume this is the tooth dimension) on a two flute cutter, then at 6000 rpm the feed should be 2.4 units per minute - whether inches or mm does not matter - or am I way out.

In answer to the post, yes, it is possible to change the feed from units per min to units per rev, but this will involve you changing the GCode.
This might not be as difficult as it sounds, with the search and replace facility, but depending on who wrote the wizards, whether he (or she) would be willing to sit down and add it in would be up to them.

I think, however, if you work out accurately what movement you need, if you are fairly accurate with your spindle speed, and it does not vary overmuch (as in Constant Surface Speed work), then using this as a units per minute feed should not make any difference.
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Re: units per min vs units per rev
« Reply #3 on: March 21, 2009, 09:47:47 AM »
Thank you for your replies

All my machinist life as been working in thousands per tooth, on manual machines,you can feel the cutter . I have to wrap my mind on cnc milling of letting the machine go on it's own,and using very small carbide end mills .125 or less ,it is quite a challenge .

And working with titanium and manganese bronze does not help .

Well i always like a challenge and this is it.

Marcel Beaudry 
Re: units per min vs units per rev
« Reply #4 on: March 21, 2009, 12:47:45 PM »
Hello Chip

Even if i use the mpg to jog only the units per min works , the unit per revolution does not show anything.

Hope this helps

Marcel

Offline Chip

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Re: units per min vs units per rev
« Reply #5 on: March 21, 2009, 01:11:28 PM »
Hi, Marcel

Post a copy of your Mach3Mill.xml file so I can take a look at your setup. I've sent you a PM message.

Chip

Offline Chip

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Re: units per min vs units per rev
« Reply #6 on: March 21, 2009, 04:55:19 PM »
Hi, Marcel

Enjoyed the conversation with you today, Now that I have a better understanding of your setup.

I was thinking you couldn't get your F speeds slow enough or your Steps Per wasn't allowing a small enough step move value.

The best solution is to use/make a chart for your cutters and establish a F speed for the material and cutter size's your using in unit's per minute.

I don't think there is a practical way to use G95 with your current setup.

There might be a way if your Spindle was setup as a lathe is setup, But that would require allot of re-configuring work

Thanks, Chip

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Offline Hood

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Re: units per min vs units per rev
« Reply #8 on: March 21, 2009, 05:49:28 PM »
Chip/Marcel
Just wondering why G95 cant be used, do you not have spindle feedback?
Hood

Offline Chip

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Re: units per min vs units per rev
« Reply #9 on: March 21, 2009, 06:08:33 PM »
Hi, Hood

He has spindle feedback and is going to post his xml file later today and will need some guidance in configuring the setup.

Chip