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How to use a wiggler to locate
the edges of a part

Shop for Centre and Edge Finding Sets

The disc probe and ball probe attachments can both be used to find the edges of a part. The disc probe and ball probe attachments can both be used to find the edges of a part.
Step 1 Insert the selected probe into the body of the wiggler. Step 2 Mount the wiggler into the chuck or collet of your milling machine or drill press.

Step 1 – Insert probe

Insert the selected probe into the body of the wiggler.

Step 2 – Mount wiggler

Mount the wiggler into the chuck or collet of your milling machine or drill press.

Step 3 Secure the workpiece in a vice or base-plate underneath the spindle of the machine. Roughly align the table so that the probe makes contact with the edges of the part.

Step 3 – Secure workpiece and align table

Secure the workpiece in a vice or base-plate underneath the spindle of the machine.

Roughly align the table so that the probe makes contact with the edges of the part.

Step 4 Start your machine, setting it to run at 1000RPM. The disc probe will begin to wiggle as the spindle rotates. Move the table further across until the wiggler starts to touch the part.

Step 4 – Start machine

Start your machine, setting it to run at 1000RPM.

The disc probe will begin to wiggle as the spindle rotates.

Move the table further across until the wiggler starts to touch the part.

   Wonkee Donkee says: 'When using a wiggler, make sure that you don’t set your machine to run any faster than 1000RPM. If the wiggler is used at speeds higher than this, the probe may become detatched from the body of the tool and fly off across the room!'
Step 5 As the table is brought closer to the wiggler and the disc or ball probe starts to move closer to the part, the wiggling will start to subside until the tool appears almost still.

Step 5 – Wiggler will start to subside

As the table is brought closer to the wiggler and the disc or ball probe starts to move closer to the part, the wiggling will start to subside until the tool appears almost still.

Continue to move the table towards the tool until the wiggler breaks away. It will do this when it reaches the part. The probe of the wiggler will kick out away from the body. Continue to move the table towards the tool until the wiggler breaks away.

It will do this when it reaches the part. The probe of the wiggler will kick out away from the body.

Step 6 When you reach this point, zero the x axis on the digital readout (DRO) of your machine. However, the spindle of the machine is not yet centred over the edge of the part.

Step 6 – Zero x axis

When you reach this point, zero the x axis on the digital readout (DRO) of your machine.

However, the spindle of the machine is not yet centred over the edge of the part.

Step 7 After zeroing the x axis, you will have to move the table a little further to compensate for the diameter of the disc or ball probe. Half the diameter of the probe you are using. In this case, the diameter of the disc probe is 2.9mm so the table needs to be moved a further 1.45mm.

Step 7 – Move table to compensate for diameter of probe

After zeroing the x axis, you will have to move the table a little further to compensate for the diameter of the disc or ball probe.

Half the diameter of the probe you are using. In this case, the diameter of the disc probe is 2.9mm so the table needs to be moved a further 1.45mm.

Step 8 Reset the x axis.

Step 8 – Reset x axis

Reset the x axis.

The centre of the spindle will now be directly above the true edge of the part. The centre of the spindle will now be directly above the true edge of the part.
Repeat this procedure to locate the opposite edge. You can then use the corner connecting the two edges as a reference point from which to machine features such as holes or grooves. Repeat this procedure to locate the opposite edge.

You can then use the corner connecting the two edges as a reference point from which to machine features such as holes or grooves.

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