How to Adjust Micro Joint Settings in CypCut for Laser Cutting

Small parts can create some of the biggest problems in fiber laser cutting.

A part may be completely cut from the sheet, but instead of staying flat on the cutting bed, it can tilt upward, rotate, fall through the slats, or remain partially attached to the surrounding sheet.

In the worst case, the raised part can interfere with the cutting head and cause a collision.

This is where Micro Joint in CypCut becomes useful.

A Micro Joint leaves a small uncut section in the cutting contour so that the finished part remains connected to the sheet skeleton until the cutting process is complete. CypCut supports both manually positioned micro joints and automatic micro-joint insertion.

But adding micro joints is not simply a matter of choosing one number and applying it to every job.

A joint that works well for a small stainless-steel bracket may be too weak for another part. A joint that keeps a heavy component stable may create excessive grinding or deburring work.

The objective is to find a practical balance:

Strong enough to keep the part stable, but small enough to remove without unnecessary finishing work.

This guide explains how to adjust Micro Joint settings in CypCut, where to place them, how to troubleshoot failed joints, and how to develop a reliable strategy for different production conditions.

What Is a Micro Joint in CypCut?

A Micro Joint is a small section of a cutting contour that is intentionally left uncut.

During normal cutting, the laser follows the complete contour.

When the tool path reaches the Micro Joint, the laser does not fully cut through that small section. The remaining material acts as a small bridge between the part and the surrounding sheet skeleton.

The result is:

Part → Micro Joint → Sheet Skeleton

Instead of:

Part → Completely separated from sheet

This simple change can prevent a finished part from moving before the entire sheet has been processed.

CypCut displays a Micro Joint as a gap or interruption in the graphic path. The software allows users to insert joints manually and provides an automatic MicroJoint function for larger batches of parts.

Why Do Laser-Cut Parts Need Micro Joints?

The problem becomes more obvious when cutting small or lightweight components.

Imagine a sheet containing hundreds of small brackets.

As the cutting process progresses, individual parts become separated from the surrounding material.

A small part may:

• fall into the machine bed;
• move because of assist-gas pressure;
• rotate inside the cutting area;
• become trapped between machine slats;
• tip upward;
• interfere with the cutting head.

The risk increases when the part is small relative to the machine-bed support spacing.

A Micro Joint keeps the part connected to the skeleton until the operator is ready to remove it.

This is particularly useful for:

• small brackets;
• tabs;
• mounting plates;
• electrical enclosures;
• small decorative parts;
• repeated components;
• thin sheet-metal parts;
• densely nested production jobs.

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1. How to Choose Micro Joint Size

There is no single Micro Joint length that works for every material and thickness.

The correct value depends on:

• material;
• sheet thickness;
• part size;
• part weight;
• contour geometry;
• cutting method;
• cutting parameters;
• kerf width;
• machine stability;
• how the finished parts will be removed.

For this reason, avoid treating values such as 0.3 mm, 0.5 mm, or 1.0 mm as universal settings.

Instead, start with a conservative value appropriate for the actual application and then validate it with a test cut.

The important question is:

Will the joint keep the part stable until cutting is finished without creating excessive post-processing?

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A Practical Adjustment Method

If the part falls out or moves during cutting:

Increase retention.

This can mean:

• slightly increasing joint size;
• adding another joint;
• changing the joint position;
• reducing the distance between joints.

If the part remains firmly attached and requires excessive grinding:

Reduce retention.

This can mean:

• reducing joint size;
• reducing the number of joints;
• moving joints to easier-to-remove locations.

Make one change at a time when developing a new process.

This makes it much easier to understand what actually improved the result.

2. How Many Micro Joints Should You Use?

The required number depends primarily on the geometry and stability of the part.

A small rectangular part may require only a few strategically positioned joints.

A long narrow component may need a different arrangement.

A large or irregular component may require additional retention points.

The important principle is:

Distribute the joints so that the part cannot easily rotate or tip after most of its contour has been cut.

Do not automatically put the same number of joints on every part in a nesting job.

Large parts that remain well supported by the skeleton may need fewer or no micro joints.

Very small parts may need more deliberate retention.

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One Joint Can Behave Like a Hinge

Consider a small rectangular component with one Micro Joint.

The joint may keep the component attached, but the part can still rotate around that remaining connection.

This can be acceptable for some geometries.

For other parts, it can create a tipping risk.

Adding another strategically positioned joint can prevent this rotation.

The objective is not simply to increase the joint count.

It is to control the movement of the part.

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3. Where Should Micro Joints Be Placed?

Placement is often overlooked.

The same joint size can produce very different results depending on where it is located.

Prefer Straight Sections When Possible

A straight section is usually easier to separate and deburr than a highly detailed corner.

This is especially important for parts with visible edges.

A joint placed on a functional or cosmetic surface can create additional finishing work.

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Avoid Critical Functional Features

Do not place a Micro Joint directly across:

• precision holes;
• narrow slots;
• mounting surfaces;
• sealing edges;
• finished decorative surfaces;
• tight-fit areas.

The remaining material must eventually be removed, so the joint location should be selected with the final part in mind.

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Be Careful Around Corners

A joint close to a sharp corner can create a more difficult finishing operation.

If possible, position the joint on a relatively straight section of the contour.

However, this should be treated as a practical guideline rather than an absolute software rule.

The best position depends on the part geometry and how the component will be removed.

Micro Joint and Kerf Compensation

Kerf compensation also matters.

The programmed Micro Joint is part of the cutting geometry, while the actual laser removes material according to the process kerf.

Therefore, an extremely small programmed joint may not behave exactly as expected in the physical cut.

But avoid using a universal formula such as:

“Micro Joint length must always be greater than two times kerf width.”

That is too simplistic for all materials and cutting conditions.

Instead, validate the actual joint experimentally.

The practical test is simple:

1. Cut a sample part.
2. Measure the remaining bridge.
3. Check whether the part stays stable.
4. Remove the part.
5. Inspect the remaining mark.
6. Adjust the setting.

The physical result is more important than a theoretical formula.

How Material Changes Micro Joint Behavior

A Micro Joint is not just a software object.

It is a piece of real material that must survive the cutting process.

That means material type and thickness matter.

Carbon Steel

Carbon steel may be relatively straightforward to separate when the remaining bridge is properly selected.

However, thicker material can require stronger retention.

The final setting should be validated against:

• thickness;
• part size;
• cutting gas;
• cutting parameters.

Guide to: Laser Cutting Speed Calculator

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Stainless Steel

Stainless-steel parts often require more attention to finishing.

A joint that is technically strong enough may still be undesirable if it leaves a visible mark on a finished surface.

For appearance-sensitive stainless-steel parts, consider:

• joint location;
• number of joints;
• remaining bridge size;
• removal method;
• subsequent polishing.

Do not assume that making the joint as small as possible is always the correct solution.

A joint that is too weak can allow the part to move before cutting is complete.

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Aluminum

Aluminum has different thermal and mechanical behavior from steel.

When developing Micro Joint settings, test the actual alloy and thickness.

Pay attention to:

• whether the joint remains intact;
• whether heat causes the joint to weaken;
• how the part separates;
• whether the remaining material damages the finished edge.

Again, the correct setting should come from the actual process rather than a universal chart.

What If the Micro Joint Is Too Strong?

The opposite problem is also common.

The parts remain securely attached, but operators spend too much time removing them.

Typical signs include:

• excessive hammering;
• difficult manual separation;
• large remaining tabs;
• grinding marks;
• damaged finished edges;
• high deburring labor.

In this situation, consider:

• reducing joint size;
• reducing the number of joints;
• moving joints to easier locations;
• improving the removal method.

Do not solve a finishing problem by simply accepting more labor.

The entire cutting-and-removal workflow should be optimized.

Micro Joint Removal Should Be Part of the Design

The operator who removes the part should be considered when programming the cutting job.

Ask:

How will this part be removed?

Possibilities include:

• hand breaking;
• pliers;
• pneumatic tools;
• deburring equipment;
• tumbling;
• automated part separation.

A joint that is acceptable for manual separation may be unsuitable for automated downstream processing.

Therefore, Micro Joint settings should be developed together with the production workflow.

When Should You Avoid Micro Joints?

Micro Joints are useful, but they are not necessary for every part.

You may not need them when:

• the part is large and heavy;
• the part remains well supported by the surrounding skeleton;
• the geometry naturally prevents movement;
• the production process already uses another retention strategy;
• the part is processed with a cutting method that does not require conventional micro-joint retention.

Adding unnecessary joints only creates additional finishing work.

What About Nano Joint?

Some CypCut/FSCUT configurations and software versions provide more advanced joint strategies.

However, the exact availability and behavior depend on the installed software version and controller configuration.

The CypCut documentation itself notes that software functions can change between versions.

Therefore, do not assume that every CypCut installation has the same Nano Joint controls.

If your system provides such a function, check the documentation for the exact version and controller before applying it to production.

More importantly, do not assume that an advanced joint mode is automatically better for every material or thickness.

Test it against the actual production requirement.

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How to Handle Hundreds of Small Parts

For large nesting jobs, manual placement is inefficient.

A better workflow is:

Select the relevant parts → Apply Auto MicroJoint → Review the result → Adjust exceptional parts manually → Simulate → Run a test → Save the process

This gives you the efficiency of automatic programming while retaining manual control where geometry requires it.

For example, a production sheet may contain:

• 200 small brackets;
• 50 medium panels;
• 10 large plates.

You do not necessarily want the same Micro Joint strategy on all three groups.

Group-based programming can be much more efficient.

FAQ: Micro Joints in CypCut

Q1: Can I put micro joints on a common line (shared line)?

A: Yes, but be careful. In common line cutting, the parts share an edge. If you place a joint there, the parts will be fused together. You usually place micro joints on the non-shared edges of the part to keep the whole strip attached to the skeleton frame.

Q2: Does adding micro joints slow down the machine?

A: Yes, slightly. Every standard micro joint requires the machine to decelerate and accelerate. This is why Nano Joints (Fly cutting joints) are preferred for high-volume thin sheet, as they don’t require a full stop.

Q3: How do I remove the small “burr” left by the micro joint?

A: There are machines for this (Time Savers, tumbling barrels). For manual work, a pneumatic belt sander (finger sander) is faster and cleaner than an angle grinder.

Q4: My micro joints keep burning away on 12mm steel. Why?

A: On thick steel, the heat accumulation is massive. A tiny 1mm bridge will melt. You need to use a “Cooling Point” (Lead-in with cooling) or simply increase the joint size to 3mm and accept that it will need heavy grinding later.

Read more:

Laser Beam Center Misalignment

Troubleshooting the Capacitive Height Sensor

HypCut vs CypCut Software

CypCut FlyCut Settings