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By Blue_Chips

August 29, 2015, 9:05 am

Plunge RMP showin higher RPM then available.

Hi again Eldar,
Nuther question :)

Using the Circle/ramp calculator is is showing a plunge rate higher then the cutting feed rate and also at a RMP much higher then the available RPM set in the machine specifications. Changing the high RPM to the available rpm makes no changes to the Plunge feed rate.
Also click from 1 thru 4 flute with these setting and look at the chip load and feed rates, just does not seem correct, but I'd be the first to admit, "What do I know" :)

Thanks
Ken

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Eldar Gerfanov

August 29, 2015, 1:40 pm

Hi,

This was a known issue that has just been fixed.
Please download an update.

Plunge Feed is not directly linked to RPM to comply with CAM integration i am working on.
The best idea is to keep it green (default)

Thanks!

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Blue_Chips

August 29, 2015, 4:16 pm

Eldar,
Still getting plunge rates higher then feed rates, depending on "Cut Data"
This doesn't seem right, if it is tell me, now I won't use those feeds and continue on with my 1/2 or less feed but will accept that is the way it is.

The very high unrelated to what is available RPM is still there also when ever "reset" is clicked guess that doesn't really matter since it doesn't come into play anyway.

I just can't seem to get a grip on using this program and feeling comfortable with it's output.


Ken

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Eldar Gerfanov

August 29, 2015, 5:23 pm

Quote:"BLUE_CHIPS"
Eldar,
Still getting plunge rates higher then feed rates, depending on "Cut Data"
This doesn't seem right, if it is tell me, now I won't use those feeds and continue on with my 1/2 or less feed but will accept that is the way it is.

The very high unrelated to what is available RPM is still there also when ever "reset" is clicked guess that doesn't really matter since it doesn't come into play anyway.

I just can't seem to get a grip on using this program and feeling comfortable with it's output.


Ken


Ken,

Depending on parameters specified in Circle/Ramp dialog you will get higher feedrate for plunging when:
1) Ramp angle is quite low (below 5 degree) and Pitch Depth is lower than the ideal depth, suggested for this cutter type
2) Workpiece Material is either soft steel or aluminum and allows increased feedrate when cutting softer materials
3) You are using a pilot hole when ramping into the hole.

Please see an attached screenshot where plunging feedrate IS be hihger than milling

It is explained very easy:
Pitch (Depth of Cut) in plunging move IS a lot lower than cut depth in actual subsequent cutting move.
Both feedrates are calculated independently from each other depending on their material load.

In essence, why would i even provide a plunging feedrate if it was not calculated according to cutting conditions?

In the second screenshot pitch is higher and plunging feedrate is lower.

Let me know if this clears things up for you. :ernaehrung004:

Low pitch=High feedrate Plunging_feedrate.PNG High Pitch=Low feedrate Plunging_feedrate2.PNG
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Blue_Chips

August 29, 2015, 5:56 pm

Eldar,
Faster plunging feeds into a pilot hole are understandable but then that isn't really a plunging cut. Cannot grasp the idea of how plunging at full cutter diameter would be at a faster feed rate then traditional milling feeds.

That said, your answer was clearly explained and understood.
Maybe I'll give it a go, but am not real sure on that :smile:

Thanks for the prompt replies Eldar.

I think I need one of these :laugh:


Ken

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