Frequently Asked Questions
Custom processing solutions for metal and non-metal parts across electronics, marine, automation, medical and infrastructure projects. Find your industry and see how we can help.
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Our engineering team is ready to answer specific questions about your project.
General & Process
Getting started, lead times, quoting and ordering
What services does Lumen Future offer?
What file formats do you accept for quoting?
What is the typical lead time for orders?
Lead times vary by service and quantity:
- Prototypes (1–5 pcs): Often same-day or next-day for standard jobs placed before noon.
- Small batches (6–50 pcs): 2–5 working days from drawing approval.
- Production runs (50–500 pcs): 5–10 working days depending on complexity.
- Large runs (500+ pcs): Quoted per job with a confirmed delivery date.
Lead times are always confirmed on the quote. If material needs to be sourced, add 3–5 working days.
Is there a minimum order quantity?
Do you supply raw material, or do I need to provide it?
Where are you located and do you deliver across Singapore?
Can you combine multiple services in a single order?
Do you offer DFM (Design for Manufacturability) review?
Metal Cutting
Fibre laser cutting for steel, aluminium, brass, copper and more
What metals can you cut with laser?
What tolerance can you hold on laser cut metal parts?
What is the maximum steel thickness you can cut?
What is the minimum feature size or hole diameter for metal cutting?
What edge quality can I expect from laser-cut metal?
Can you cut copper and brass with laser?
Do you offer cutting and bending in the same order?
Glass Cutting
CO₂ laser cutting for float, borosilicate, display and optical glass
Can you cut tempered or toughened glass?
What is the thinnest glass you can cut?
Can you cut circles, arcs and irregular shapes in glass?
What types of glass can you cut?
How is cut glass packaged for delivery?
Why is CO₂ laser better for glass than other cutting methods?
PI Film Cutting
UV and CO₂ laser cutting for flexible PCB, Kapton and polyimide
What is the difference between CO₂ and UV laser for PI film?
Can you cut multi-layer FPC stacks (PI + adhesive + copper + coverlay)?
What is the minimum slot width or feature size for PI film?
What file format should I use for FPC outline cutting?
Do you offer lot traceability for semiconductor and medical FPC cutting?
Can you cut from roll format PI film?
CNC Bending & Folding
Press brake bending for sheet metal enclosures, channels and frames
What is the minimum flange length for CNC bending?
What inside bend radius do you use as standard?
What happens to holes near a bend line?
What is the maximum bend length your press brake can handle?
Why does my bent part not come out at exactly the angle I specified?
What file format do you need for bending jobs?
Laser Engraving
Permanent marking for metals, plastics, glass and organic materials
What is the difference between laser engraving and laser annealing?
Can you engrave on already-coated or anodised parts?
Can you handle batch serialisation — different content on each part?
Will laser engraving survive harsh environments, autoclaving, and electroplating?
What materials can you engrave?
What file formats do you accept for engraving artwork?
Welding & Assembly
Laser welding, TIG, MIG and structural assembly
When should I choose laser welding over TIG welding?
Do you provide weld inspection and documentation?
Can you weld aluminium alloys?
Yes. Aluminium TIG uses AC current with pure argon to break the oxide layer. We weld 5052, 6061, and 1100 series regularly. 6061-T6 loses strength in the heat-affected zone — for structural applications we advise on design changes to minimise HAZ impact. 7075 and 2024 are prone to hot cracking with TIG; we use laser welding with controlled parameters for these alloys.
What post-weld treatments do you offer?
We offer weld spatter removal, bead grinding and blending, stainless steel passivation (citric or nitric acid per ASTM A967), and surface finishing to specified Ra values including Ra ≤ 0.8 μm for food-grade and pharmaceutical applications. These are included in the overall quote — you receive a finished assembly, not a raw welded part.
Can you weld dissimilar metals?
Some combinations are weldable with the right filler — 304 SS to mild steel using ER309 filler, for example. Aluminium to steel is generally not weldable by fusion due to intermetallic formation. Send us the material combination and joint geometry and we advise on feasibility and recommended approach before committing to production.
Do you build custom weld jigs and fixtures?
Yes. For repeat assemblies we build custom weld jigs that locate every component in position before welding — ensuring every unit in a batch is dimensionally identical. Jig cost is a one-time charge included in the initial production order quote. For low-volume or first-off jobs we use adjustable fixtures rather than dedicated jigs.
Polishing & Grinding
Deburring, brushed finish, mirror polish and surface grinding
How do I specify the surface finish I need?
Specify the Ra value on your drawing — e.g. “Ra ≤ 0.8 μm all over” or “Ra 1.6 μm on machined surfaces”. Alternatively, specify the application standard: “food-grade per EHEDG”, “architectural #4 brushed”, or “cleanroom Class 10,000”. If you have a reference sample, send it with your parts and we’ll match it. Common grades: Ra 3.2 (deburr), Ra 1.6 (#3 ground), Ra 0.8 (brushed #4), Ra ≤ 0.8 (food-grade), Ra 0.1–0.4 (mirror #8).
Why can't I use the same abrasive tools on stainless steel and carbon steel?
Tools used on carbon steel embed iron particles into the abrasive. When applied to stainless steel, these particles deposit onto the surface and corrode — causing rust spots within days. This is called ferritic contamination and invalidates food-grade and marine certification. We maintain entirely separate abrasive inventories for ferrous and non-ferrous metals and never mix them.
What is the difference between passivation and polishing?
Polishing is a mechanical process — removes material to produce a specific surface texture (Ra value). Passivation is a chemical process (citric or nitric acid per ASTM A967) that removes free iron and restores the chromium-oxide passive layer on stainless steel. Passivation does not change texture. For food-grade and marine stainless, both polishing to Ra ≤ 0.8 and passivation are typically required — they are complementary.
Can you polish welded assemblies?
Yes — polishing welded assemblies is one of our most common jobs. We grind weld beads flush, blend into parent material, and refinish to the specified Ra with matched grain direction. Weld zones have different hardness and grain structure, and tool access is sometimes restricted by adjacent geometry — we assess all this during quoting.
Can you match brushed grain direction across multiple panels?
Yes. For architectural and enclosure projects requiring consistent finish across batches, we use the same abrasive grade and direction throughout. Panels are processed in sequence to ensure the grain pattern matches. For large runs, we retain a reference panel approved by the customer against which we check consistency throughout production.
Do you offer electropolishing?
Electropolishing is not performed in our facility, but we coordinate with qualified electropolishing subcontractors in Singapore for jobs requiring Ra ≤ 0.4 μm on complex geometries, or FDA 21 CFR / USP Class VI surface requirements. We manage the coordination and include it in the quote — one supplier, one delivery.
Laser Cleaning
Rust, oxide, paint and contamination removal without abrasives
How does laser cleaning work without damaging the substrate?
Can laser cleaning remove heavy rust?
Yes. Multiple passes handle heavy flaking rust, achieving bare metal without dimensional loss. For severely pitted surfaces where corrosion has entered the base metal, laser cleaning removes loose rust and active corrosion from pits but cannot restore metal that has been consumed. We assess corrosion depth during quoting and advise on achievable results.
Does laser cleaning restore the passive layer on stainless steel?
Laser cleaning removes chromium-depleted heat tint oxide, exposing the underlying chromium-rich layer which re-passivates naturally in air within hours. For applications requiring documented passivation, we recommend following laser cleaning with citric or nitric acid passivation per ASTM A967 — this accelerates and certifies the passive layer. We include passivation in the same job scope.
Can you clean only a specific area of a part?
Yes — selective zone cleaning is a primary advantage of laser over blasting and chemical methods. We program the beam path from your DXF or from a marked area on the part. The beam stays precisely within the defined zone. No masking, no overspray, no risk of damage to surrounding surfaces. Common uses: weld seam only, corrosion patches, pre-bond zones, and contact pad areas.
Is laser cleaning safe for aluminium and anodised parts?
Laser cleaning on bare aluminium removes oxide and adhesive contamination effectively. On anodised aluminium, the laser will remove the anodised layer — so we only clean specific uncoated zones (edges, weld prep areas, bonding spots) while leaving the anodised surface intact. Tell us which zones to clean and we program the beam path accordingly.
How does laser cleaning compare to abrasive blasting?
Laser cleaning does not embed abrasive particles in the surface (critical for stainless steel where iron contamination causes rust), does not alter surface texture or Ra value, allows selective zone cleaning without masking, produces no contaminated grit requiring disposal, and can access complex geometry that blasting cannot. Abrasive blasting remains faster for very large surface areas of heavily rusted mild steel where texture preservation is not a requirement.
Still Have Questions?
Our engineering team reviews every enquiry and responds within one business day. Send us your drawing and we’ll give you a direct, technical answer — not a generic response.