XEBEC Brush™ Crosshole FAQ

XEBEC Brush™ Crosshole

How much rotation speed is necessary?

Recommended rotation speed is 8,000min-1-10,000min-1.
Because XEBEC Brush Crosshole has high grinding power on the tip, the brush tip needs to be in contact with the machining area (the part where burrs occur). When machining the hole, it is necessary to rotate the brush to expand it by centrifugal force.
See the process condition for the details

Which equipment should I use for the rotating machine?

NC equipment and special machines can be used, but a rotation speed of 8,000min-1-1200min-1 is required.
If the rotation speed does not go up, use an amplifier to increase the rotation speed.

What size of burr can be removed?

The tool aims to remove fine burrs with the burr root thickness of 0.1mm or less (approximately the size that can be bent by pushing one's fingernail against burrs).

What kind of workpiece material can be machined?

Workpiece materials up to HRC65 including stainless steel, aluminum alloy, general steel material, copper and resin.

What size of hole can be machined?

The target hole diameter of the main bore is between 3.5 mm and 20 mm.

Is it possible to use the tool for holes smaller than the 3.5 mm diameter?

The target diameter is set to slightly smaller than the safety value because the tip spreads out a little.
Usually, we recommend inserting without rotation when inserting the brush into the workpiece, but rotating the brush in low speed at around 300min-1 would keep the brush tip together, and it may be possible to insert the brush into a hole that is smaller than the target hole.
In addition, if there is a chamfer on the hole edge, it would be easier to insert the brush, so it may be possible to insert the brush into a hole with a diameter that is smaller than the target hole diameter.

What is the surface roughness after machining?

It is capable of finishing the surface up to around Ra-0.1μm.

Are there any effects on the hole dimensions of the main bore?

There is a possibility that it will be ground by a few μm, although this depends on material and machining conditions.

Will there be any issues by performing wet (oil) machining?

The tool can be used for both dry and wet (both oil-based and water-soluble) machining, so you can use the coolant.
Wet machining may improve surface finish quality and tool life.

Will the brush shape be deformed after machining?

Unlike nylon bristles and wire bristles, XEBEC Brush does not deform after machining (the tip does not spread like toothbrushes), so stable machining is possible.
See the products page for the detail.

How much should I move the tool up and down against the crosshole?

Offset the brush when it becomes shorter, the tool is often used by moving the brush about 1mm up and down against the target crosshole.

How long is the tool life (how many workpieces can be machined)?

Based on XEBEC test results, approximately 4,500 holes can be machined. This is over seven times the number of holes that can be machined by nylon brushes containing diamond abrasive grains.

How do I determine the end of tool life?

Aim to replace the tool when it is worn out 10mm.
When the brush is worn out 10mm, it is necessary to increase the rotation speed to expand the brush enough to deburr.

How should I perform tool life management?

Manage the number of machined workpieces. In general cases, users perform a test and record the number of workpieces at which burrs can no longer be removed, and they set the tool life at about 80% to 90% of that number.

I used the tool within the range of target diameter but the brush broke. Why?

In the following cases, it may cause brush damage.

T-shaped hole
If the diameter of the cross hole is equal to or greater the diameter of the main bore. (For example, if the main bore is φ10 mm and the cross hole is φ10 mm or larger.)

Cross-shaped hole
If the diameter of the cross hole is more than 70% of the diameter of the main bore. (For example, if the main bore is φ10 mm and the cross hole is φ7 mm or larger.)

Perform an initial test while monitoring the behavior of the brush tip, and confirm that the brush does not break before use.
See the How to Use page.

How should I clean the brush?

Remove the attached dust or coolant by blowing air, etc.

Can you regrind (truing) or re-embed the brush?

You can regrind the brush by forming it using a diamond electrodeposited grinding stone. We do not offer regrinding or re-embedding services.
For more information, please see the Maintenance page.

Can you produce a brush with a diameter of Φ1.5mm or less?

No, it is not possible. The number of bristles of CH-A12-1.5M (brush diameter Φ1.5mm) is about 7, and tools with less bristles than this are not expected to be effective due to reduced grinding power.

Do you handle special order products?

Yes, we provide services such as extension of bristle length for standard brushes and modification of the brush tip shape. Please contact us for more information.

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