Vacuum Casting Materials Guide: ABS-like, PC-like, Clear & Elastomers
Select ABS-like, PC-like, clear optical, and rubber-like polyurethane resins for vacuum casting / urethane casting projects.
JS Model Knowledge Hub
CNC Machining Knowledge Hub
Guides and shop-floor notes from JS Model Technology Co., Ltd. on CNC machining, materials, DFM, and small-batch production for buyers validating prototypes in Bao'an, Shenzhen.
Latest manufacturing articles
Practical notes on CNC machining, materials, DFM, sheet metal, vacuum casting, and quality — mapped to real JS Model capabilities.
Vacuum Casting vs Injection Molding: Cost, Volume, Lead Time
Compare vacuum casting and injection molding on tooling cost, lead time, material fidelity, and the volume where each wins for engineers and buyers.
What Is Vacuum Casting (Urethane Casting)? A Practical Guide
Vacuum casting — also called urethane casting — makes production-like plastic parts from silicone molds. Learn how the process works, when to use it, and typical volumes.
Can a Multi Start Thread Make an 8 mm Plastic Screw Affordable?
A customer needed five plastic parts with an 8 mm-diameter, 51 mm-long thread. The original single-start, 5 mm-lead PPSU design required about $500 in custom tooling and $200 in Swiss-lathe setup. By changing the design to a two-start thread with a 1.25 mm pitch and 2.5 mm lead, we could use available matched tooling and produce one polycarbonate assembly prototype for about $170.
Why Did ESD PEEK Triple the Material Cost on This CNC Project?
We overlooked the ESD designation on a customer’s drawing and machined the parts from standard PEEK. The correct grade cost about three times as much. This case explains why the two materials are not interchangeable and which material checks should happen before stock reaches the machine.
Why Did a Bronze Filled PTFE Rod Cost More Than PEEK?
A custom 60 × 200 mm bronze-filled PTFE rod cost more than stocked PEEK because it required a separate material batch. This case explains how bronze improves PTFE for sliding wear, why custom compounds increase lead time, and when a standard stocked grade can reduce CNC machining costs.
Gear Hobbing vs Milling: Why Did a 100-Piece Custom Helical Gear Order Still Go Over Budget
A one-off aluminum bronze helical gear made sense on a five-axis CNC mill. At 100 pieces, hobbing reduced the overall quote by 20–30%, but the custom hob, setup, bronze material, and inspection costs still pushed the project over budget.
Why Did Fingerprints Rust After Carbon Steel Passivation?
A batch of carbon steel parts developed clear fingerprint rust after being processed to ASTM A967 Nitric 1, while 303 stainless steel parts did not. The root cause was a material-specification mismatch: ASTM A967 is for stainless steel. This case explains the difference and what buyers should confirm before specifying manganese phosphate or another finish for carbon steel.
How Can Sheet Metal Embossing Preserve Tactile Detail After Powder Coating?
A custom $600 steel die formed 0.3–0.5 mm tactile features in 1 mm SGCC sheet, but excess powder buildup softened the profile. This case explains how forming design, finished-part inspection, and controlled coating preserve raised details.
Buyers ask
Knowledge Hub FAQ
What topics does the JS Model Knowledge Hub cover?
CNC machining, materials, DFM, sheet metal, vacuum casting / RIM, and quality inspection notes from our Shenzhen shop floor — written for engineers and buyers planning prototypes or small-batch production.
How do these articles relate to your manufacturing services?
Each article maps to a real capability: CNC machining, sheet metal fabrication, vacuum casting, or quality control. Use the Related capabilities links to jump from guidance to the matching service page or request a quote.
Can JS Model review my drawings after I read a guide?
Yes. Send CAD files and critical dimensions through the contact page. Engineers reply with pricing and practical DFM notes for CNC, sheet metal, or urethane casting.
Are articles reviewed by manufacturing engineers?
Yes. Knowledge Hub articles are authored or reviewed by the JS Model engineering team and updated when process guidance changes.