2D Contour, Ramping Angle

[florianhaus]

Hi,

It seems that the set ramping angle in the '2D contour tool' path is not obeyed with multiple depths (2 passes) at the second pass.

I set the ramping angle to 10 degree. The first pass seems ok, but the second pass ramping angle is a lot shallower.

Can anyone verify - or am I doing it wrong?

Thank you,

Florian

[HughesTooling]

Just did a quick test and it seems OK to me.

Can you export and attach an f3d file so we can see how you've setup.

Mark

[HughesTooling]

One thought, try increasing the Maximum Ramp Step to make sure it doesn't interfere with the ramp angle.

Mark

[florianhaus]

Hi Mark,

here's the file.  

Thank you,

Florian

[HughesTooling · Accepted solution]

Now I look closer at my test file it did have the same problem, changing to 30° makes it more obvious. I guess it's a bug, I can't see anything set wrong.

Mark

[florianhaus]

Thank you, how can I report that bug?
Florian

[HughesTooling]

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@florianhaus wrote:
Thank you, how can I report that bug?
Florian

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It should get picked up here.  @jeff.walters can you take a look.

Thanks Mark

[Anonymous]

what's the status on this bug? Seems to still exists as of August, 2017

[pbmachine]

Yes I am also experiencing this bug in ramping angle with multiple depths. The first ramp obeys the parameters I set up but the following ramps use a much shallower angle (something like .05 degrees versus the 4 degrees set in the parameters) over a very long contour. 

[florianhaus]

Hi,

please try setting 'Maximum Ramp Stepdown' to '0'.

Does that work?

Florian

[Anonymous]

This has caused my eyebrows to plunge into a frown many times... thanks for this "working workaround" of setting to zero 🙂

[daniel_lyall]

You just use the Maximum ramp step down under ramp in the linking tab and do not set any depth in the passes tab this gives a constant depth from the top to bottom.

[kbpav]

will this problem be fixed?

[engineguy]

@kbpav 

IMHO There is nothing to "fix", it is working correctly as far as I can see, when using Multiple depths the first angle is a "leadin" and after that the distance to go is calculated by the Maximum depth set divided into the total depth of the Contour so there are equal steps, the angle generated depends on the depth of each stepdown, the larger the stepdown then the steeper the angle and smaller stepdown is shallower angle.

IMHO it is best to just use the Ramp and no Multiple depths as the you then get a constant tool engagement, don`t see the point of trying to use the Multiple depths as well as the Ramp, just my take on it 🙂 🙂 🙂

[daniel_lyall]

Just using maximum stepdown to set the stepdown in the ramp tab is all you need to do.

[kbpav]

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@engineguy  написал (-а):

IMHO There is nothing to "fix", it is working correctly 

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From the "user side", I see that this is not working correctly. I set the ramp angle to eg 45 - it doesn't use it. So this is a mistake.
Can developers take into account that "multiple depth" is activated and correct the formula?
Why would a user think about it and fix the default settings to "0" every time to make it work?

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@engineguy  написал (-а):

IMHO it is best to just use the Ramp and no Multiple depths 

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No. you are not right. This only works on high parts. On flat parts (of which most are) this is never used.
If the cutter allows a large angle ramp (eg 45) then it makes no sense to use a ramp without "multiple depth".
Using only the ramp we get much longer operation time. Example:
square with a side of 1m. thickness 50мм, maximum depth 25мм. If you use multiple depths, the path will be long = 4m + 4m + cos(45) * 50mm ~ 8.1m
If only the ramp is used(with max ramp stepdown 25) the path will be> 12m. which gives x1.5 machine time.
This is the reason why only the ramp is not used on flat parts - it makes one more pass along the contour.

[engineguy]

@kbpav 

This works here, is this what you are talking about ?? Distance cut is just over 8M which is correct because of the two 45 degree angle ?? Multiple depths of 25mm were used, block is the same as your 1m x 1m x 50mm

[kbpav]

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@engineguy  написал (-а):

This works here, is this what you are talking about ??

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Yes, it works. But for this you need to change the default settings every time.



Otherwise it looks like this. This topic is about it.

I know how to do it. But why was it impossible to correct the calculation formula so that it would happen automatically?
Newbies do not know this, for 5 years this question has been regularly asked on this forum, and in local groups in our region.

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[velcromohawk]

Thank you so much! You have restored my sanity. Setting max ramp stepdown to 0 was exactly what I needed to do. I am contouring letters on a wooden sign and it was ramping ALL THE WAY AROUND the cursive letters, nearly the full revolution of the contour, which is about 20inches wide. My ramp feedrate is way too slow to constantly cut at, I was gonna burn up a bit. Before I found this post I was bashing my head against settings and was able to get it to ramp properly then continued editing settings and poof ramping a full revolution of the contour again and could not figure out how to revert it.

Side note, I set max ramp step down to 10in (for experimentation purposes) and it gives the same ramping as when set to 0, odd.