Centroid Acorn Plasma Users Manual Beta CNC12 v4.65 rev6
Round Mounts
Round Mounts are a crude kinematic seat that lifts and pivots in XYZ
when the torch touches anything.
Round Mounts come in two flavors:
1.) a two sensor Round Mount and 2.) a three sensor Round Mount.
Most Round Mounts perform can two functions: Torch crash protection
(Breakaway), and as a “Float Switch” Torch touch off sensor.
Round Mounts typically employ Proximity Sensors as the switches.
Proximity Sensors also come in several flavors, make sure the round
mount has NPN NC prox switches. The Acorn Plasma system requires
NPN NC proximity sensors. (PNP will not work)
Round Mounts can be used to act solely as torch breakaway sensor to
let the CNC controller know that the torch has hit something. In this
case the all the sensors can be wired in series and connected to the
Torch Breakaway input.
Round Mount heads can also be set up so that one of the proximity
switches performs the Torch “Float Switch” duties and the others are
used as Torch “Breakaway” sensors.
Note: Sometimes getting the cheap made in china round mounts to trigger properly will require a bit of trail and error
adjustment and sometimes will require modifying the unit to get it to perform as intended.
For Round Mounts that have three sensors, often two of them are used as the Breakaway sensors and the third is
the Torch Float switch. In this case simply wire the two breakaway proximity switches in series as seen in the Round
Mount schematics.
Page 13 D:\Keith Documents\centroid_acorn_plasma_users_manual_draft27.odt rev27 3-15-22
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