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What is chatter on a deburring tool?

What is chatter?

Shop for Deburring Tools

 Chatter marks in a machined hole is seen as waves Chatter is when a cutting tool (e.g. deburring tool, drill bit, countersink) vibrates and leaves very small marks or ‘waves’ on the cut surface of the material, which can be seen once the workpiece has been machined. Chatter can be caused by several factors:

Movement of the workpiece

 A machine vice could be used to clamp the work piece for de-burring Any movement of the workpiece or tooling, due to poor clamping, results in vibration through the workpiece or tool bit, causing chatter.

Over-sharp or dull cutting edges

Chatter marks where the tool has grabbed the wood Dull or over-sharp cutting edges on the deburrer can cause chatter marks on the surface of the workpiece where the hole is being machined.

Incorrect cutting speed

 Cutting speed is the rate at which the chuck spins the cutting ttool around Chatter can be the result of incorrect machine cutting speeds. For more information, see our section: What speed should a deburring tool be used at?

Deburring tool run-out

 Run out is seen by the user as a wobble action of the tool bit Run-out on a deburring tool is when the tool doesn’t spin true. This is seen by the user as a wobble in the bit when the machine chuck is spinning.
If run out occurs, the shank of the tool may be bent, or there may be a problem with the chuck. Check the chuck and tool for signs of wear and tear, as they may need replacing or the set up altering. If the tool is not inserted correctly this may cause run out.

Incorrect feed rate

 The feed rate is the speed the tool moves forward accross the work piece or the speed the item moves under the tool bit An incorrect machine feed rate may lead to chatter marks being left on the workpiece, because of the increase in vibration between the workpiece and tool.

Lack of lubrication

Lack of lubricant can lead to the tool tips grabbing the material and leaving chatter marks. A lack of lubricant on the workpiece could result in the tool grabbing the material and leaving chatter marks. This is due to the increased friction and heat produced without any lubricant.

How do you avoid chatter?

 Machined hole with no chatter marks

Choose the correct cutting speed

Chatter can be avoided by making sure the correct speed and feed rates are chosen. For more information, see our section: What speed should a deburring tool be used at?

Different manufacturers will have different specified feed rates

Select the right feed rate

It is important that you select the correct feed rate for your deburring application. To find out the optimum feed rate, check the operating instructions for your machine, as they will vary for different makes and models.

Cutting fluid should be used when machining

Use lubrication

Which lubricant to use depends on the workpiece material. Machining lubricants are called cutting fluids and are made up of a mix of oil and water. The cutting fluid will have different blends for different materials.

 Ensure the work-piece is clamped securely

Ensure the workpiece is clamped correctly

To avoid movement, check the workpiece is clamped securely before starting any machining.

Wonkee Donkee Tools