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In the Chmer machines, if this happens and the machine
Figure 4 shows a differ-
has ball screws, you need to remove the covers and turn
ent type of switch used
the screw by hand until it is away from the limit.
in an indexer. These
In a Chmer machine with linear motor, you will need to re-
switches. They use
lease the axes brake and push the axis away from the lim-
magnets inside the
it. In Figure 2 below, look at the bottom left. In this image, are magnetic proximity
switch, and when they
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you see two switches. One is homing, and the second is
pass metal, they trigger.
the safety. The linear motor magnets are the two rows in
Most types have LEDs
the center. These are powerful magnets, so be very careful
to tell you the status.
not to put any metal near them.
Lastly, Figure 5 shows
an example of the
mechanical hard stop.
When switches fail (in
some cases because of
excessive dirt buildup),
the machine axis will
stop when it hits this Figure 4
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mechanical limit. In
some cases, when the
axis hits it, the driver will
overload and shut the
machine down.
Figure 2
In Figure 3, you see that the switches have rollers. This
I always recommend
that customers not run
type of switch is triggered when the roller goes up the
ramp that is used to activate it.
the axis at high speed
into the axis limit!
Larry McNamee
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Figure 5

Figure 3

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EDM Today Magazine Larry EDM Today Magazine Agie Wire, CHMER Wire,

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