Author Topic: Side profile limitation?  (Read 195 times)

Offline qwerty

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Side profile limitation?
« on: April 06, 2021, 18:52:05 pm »
Hi,

it is easy to specify inside Profile MOP with Side Profile (Method: Concave Radius; Value: +depth of cut) to get perfect "1/4 circle side profile" (upper half on included picture).

I am unable to modify this MOP to get result shown on bottom half on included picture. Is it even possible? I have tried many combinations but no luck.

I could manualy increase Stock Suface by 5 mm, increase Target Depth by 5 mm and set adequate negative Roughing Clearance. But half of the MOP would be air cutting...
I could use "Toolpaths to geometry" function, delete "air paths" and use Engrave MOP on remaining patsh.
Is there more straightforward alternative?


Thanks.

Boris

Offline dh42

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Re: Side profile limitation?
« Reply #1 on: April 06, 2021, 19:22:35 pm »
Hello

If there is not enough space to cut the wanted radius, you only get the "top" of the radius.

ex: Stock surface = 0 ; target depth = -5, only the first 5mm of the radius are cut = yellow toolpaths

SS = 0 ; TD = -10, there is enough space to cut the whole 10mm radius and you get the yellow + blue toolpaths

note: the toolpath are generated for a tool of 0mm diameter, so I can see the exact shape without the tool radius compensation. (do not forget to change for the right tool diameter before to generate the Gcode ;))

to do the half bottom of the radius, as on the bottom picture, you must use 3D mop ...
 
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David
« Last Edit: April 06, 2021, 19:31:54 pm by dh42 »

Offline qwerty

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Re: Side profile limitation?
« Reply #2 on: April 06, 2021, 19:51:14 pm »
I have observed the same results playing with SS and TD. I need the yellow part from your image - the second 5 mm of radius.
I made one part using 3D MOP today and I was not happy, it took too much time. Thats the reason I am intersted in side profiling the cut in regular profile MOP.

Would my suggested workaround work? Anyway, I will test it tomorrow and post the results.

Offline dh42

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Re: Side profile limitation?
« Reply #3 on: April 06, 2021, 20:16:34 pm »
the yellow or the blue ?

it's the blues that match with your bottom drawing ...

Offline dh42

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Re: Side profile limitation?
« Reply #4 on: April 06, 2021, 20:20:33 pm »
the shape has been done with Eddy's extrude rotate Revolved Extrude plugin

http://www.atelier-des-fougeres.fr/Cambam/Aide/Plugins/RevolveExtrude.html

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David

Offline qwerty

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Re: Side profile limitation?
« Reply #5 on: April 06, 2021, 23:05:29 pm »
the yellow or the blue ?
it's the blues that match with your bottom drawing ...
Right, I need blues, sory for mismatch.

My shape is not a simple circle. I have used a circle just for testing.

Offline dh42

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Re: Side profile limitation?
« Reply #6 on: April 06, 2021, 23:18:37 pm »
Quote
Right, I need blues, sory for mismatch.

Ok, I think it's not possible to do with side profile.

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David

Offline qwerty

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Re: Side profile limitation?
« Reply #7 on: April 08, 2021, 14:48:34 pm »
It works as expected... Screen attached.

When using Engrave MOP, there is no need to specify Target Depth (set to zero) as this MOP is Z-axis-aware.

Alternative is to use Profile MOP but it is neccessary to specify Target Depth for each toolpath and set Roughing Clearance to -1/2 of tool diameter. On the other hand you get option to set Lead In/Out Move.

Thanks.