acorn board fusion 360 and smooth circle

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usinart
Posts: 50
Joined: Fri Dec 25, 2020 2:06 pm
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acorn board fusion 360 and smooth circle

Post by usinart »

Hi
I want to make smooth hole in plastic and each time it kind of vibrating or shaking at the direction change . So at 3 o'clock and 9 there are somme kind of grouve or difference between the smootheness of the hole .
Q : On what variable I should play with for making it round and smooth .
thanks
Alain
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centroidsupport
Posts: 21
Joined: Tue Sep 28, 2021 6:26 pm
Acorn CNC Controller: Yes
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Re: acorn board fusion 360 and smooth circle

Post by centroidsupport »

Please always post a report when requesting support.

What motors and drives are you using? What is your depth of cut? What is your measured backlash?
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
https://www.centroidcnc.com/centroid_di ... _gear.html
CNCMaryland
Posts: 86
Joined: Thu Nov 15, 2018 10:07 pm
Acorn CNC Controller: Yes
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CNC Control System Serial Number: F045DA7CBF8b-103011290

Re: acorn board fusion 360 and smooth circle

Post by CNCMaryland »

So much in play here. The toolpath is important. This is something you need to do a ramped contour with.
rk9268vc
Posts: 56
Joined: Fri Nov 13, 2020 4:12 pm
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CNC12: Yes
CNC11: No
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CNC Control System Serial Number: none

Re: acorn board fusion 360 and smooth circle

Post by rk9268vc »

In fusion360 for each tool path you create there is a tolerance setting (I think it is either under the liking or depths tab)
This setting is the tolerance for how close it will follow the arc. (I think I have mine set at like 0.0002") This varies by type of cut, i.e. finishing passes are tighter tolerance then roughing, etc to save on file size and to allow smoothing.

You should also look under the linking tab for each toolpath to see how it is entering the cut, and if it is expected and if it is a smooth transition and is not ramping too aggressively for your machine. Remember to simulate every tool path and watch it :)

What I have had happen a few very rare times is if I have a lot of curves in rapid succession, the mill/acorn/pc seems to get bogged down and was kind of jerky in motion going around the curves. I have seen this happen in 8 bit 3D printers where it cant process all the movement commands as fast as called out and seems to get bogged down. Again, this is only in very rare cases and (so far) hasn't really been a problem

There are also smoothing settings in acorn, but I havent messed with them, and it seems to the uneducated (me) that they really shouldnt be messed with.


The other obvious thing that a lot of forum users will be quick to jump on is that your machine probably isnt ridged enough, strong/ powerful enough, or has too much backlash for the cut youre taking. So try it a lower DOC and feedrates

good luck!
martyscncgarage
Posts: 9107
Joined: Tue Mar 28, 2017 12:01 pm
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Location: Mesa, AZ

Re: acorn board fusion 360 and smooth circle

Post by martyscncgarage »

usinart wrote: Mon Nov 22, 2021 5:15 pm Hi
I want to make smooth hole in plastic and each time it kind of vibrating or shaking at the direction change . So at 3 o'clock and 9 there are somme kind of grouve or difference between the smootheness of the hole .
Q : On what variable I should play with for making it round and smooth .
thanks
Alain
Use Intercon to create a Circular pocket as a test. Report back on how it goes.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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