Slag on tight corners

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21 Dec 2024 15:36 #317090 by CopperHead
Slag on tight corners was created by CopperHead
Id like to reduce the amount of slag I'm getting on tight corners, I've searched the forum for settings on the THCAD2 and the 7i96s and really haven't found anything related to it. longer cuts and or curves come out perfect its just tight cutbacks it leaves a pile of slag. I'm cutting 12ga Steel and reduced my speed from 120 to 100 for the 12ga settings. So I'm not sure if I'm getting the height control locking at at the right time or its something else. my air quality is consistent and I run a refrigerated drier so I know my air is clean. I did change the Post processor to one of the Updated ones here called Plasmac local materials for setting the material from plasmac instead of sheetcam. it improved quite a few items during cuts. Maybe my motors and drivers aren't tuned correctly? open to anything to reduce the amount of cleanup I have to do after the cuts lol. and i might have left out some speciffics needed so ask away.

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  • tommylight
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21 Dec 2024 16:20 #317092 by tommylight
Replied by tommylight on topic Slag on tight corners
Slow cut speed = plenty of hot slag = hard to clean
Happens due to limited acceleration of the machine as it has to slow down a lot on corners.
Try upping the acceleration for X and Y axis, it should help a lot if you can get the corner speed near the normal cut speed.

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21 Dec 2024 16:31 #317093 by CopperHead
Replied by CopperHead on topic Slag on tight corners
My Current max acceleration is set to 25. I'm not sure where i got that number from unless it was a carry over from my motor and driver settings in the old Mach 4. any suggestions as to what they should be . running NEMA 23 425oz motors and the Stepper Online DM542T Drivers. Don't remember my settings for the driver but I'm pretty sure i went conservative on them as I couldn't find the correct Drivers settings in Linuxcnc

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22 Dec 2024 08:09 #317129 by rodw
Replied by rodw on topic Slag on tight corners
 
This is the laws of physics at work.
Velocity and acceleration is king for plasma
Acceleration determines the maximum arc radius that can be negotiated without slowing down

Design you parts to not have sharp corners or loop the corners.

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23 Dec 2024 13:16 #317194 by CopperHead
Replied by CopperHead on topic Slag on tight corners
These have been signs aka wall art so some areas are just needed on tight corners and such. so on items like this should i just expect a little bit of dross/slag buildup.
I'm trying to dive deeper into the software this coming year and getting my table to cut near perfect. I've already made a few changes that have helped tremendously.
I've been told that my table design is creating shakes but to be honest I don't see the water in the pan moving. I would think the slat design I have, might provide for some slat wobble during cuts. I would just like to get this table to be cutting on a professional level. lol

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23 Dec 2024 19:33 #317219 by rodw
Replied by rodw on topic Slag on tight corners

My Current max acceleration is set to 25. 

An ideal acceleration for steppers on a plasma table is about 3000 mm/sec/sec (120 in/sec/sec)
if your table is not super rigid, you won't be able to achieve that
Going beyond that acceleration is possible but you need to know what you are doing in relation to stepper build/design and table build/design

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