We’ll flag any specs that kill quote speed or push tooling out of control.
You send a part out for quote—maybe an EMI shield, contact, or sensor bracket. It looks simple. But the quote comes back three times what you expected. Or worse, no one wants to touch it.
You check the print. It’s loaded with tight tolerances—like ±0.0005” or profile callouts that mimic EDM specs. Great for prototypes. Not great for 100,000-piece production.
Here’s the real issue: parts that were designed around CNC tolerances often don’t translate to production tooling without a major cost penalty.
Whether you’re in product design, NPI, or sourcing, your job isn’t just to get a part made—it’s to get it made repeatably and affordably. You’re balancing launch schedules, quality audits, reshoring incentives, and budget constraints.
And you’ve probably learned this the hard way: CNC tolerances on a stamped part often lead to a mess of delays, quote confusion, and rework.
Let’s break it down. Yes, CNC and EDM can hold tolerances tighter than ±0.001”—sometimes even ±0.0002″ under ideal conditions. But in production, that level of control comes at a cost:
• Slower cycle times
• Custom fixturing
• Specialized inspection
• More setup per feature
• Limited throughput scalability
Now compare that to progressive stamping, which relies on:
• Material behavior (grain direction, springback)
• Piercing and forming sequences
• Die clearances and wear
• Press tonnage and feed accuracy
What this really means: You can’t hold CNC-level specs across a multi-stage stamping tool without increasing tool complexity, cost, and maintenance. It’s not impossible—but it’s often unnecessary.
Here’s how to avoid sticker shock and tooling chaos:
Don’t copy prototype tolerances into production drawings
Call out only functional features for tight control—not every edge or non-critical hole
Engage your stamping partner early for DfM input before releasing a print
Use realistic tolerances based on material thickness, tool sequencing, and part size
Clarify cosmetic vs. dimensional specs—especially if CMM or vision inspection is involved
Also: challenge the default. Many engineers still default to “as tight as possible” just to be safe. But tight specs come at a price—especially in metalforming.
When you write to the real process:
• RFQs come back faster and more accurately
• Tool builds run cleaner with fewer change orders
• Molds or dies perform longer without tuning
• Sourcing teams don’t have to walk back your tolerances
And in 2025—where reshoring, ITAR compliance, and lead-time constraints are the norm—you can’t afford to guess on tolerancing.
Better looks like this: Your part prints match the forming method. The quote is realistic. The tool runs on the first try. And no one’s fighting over microns that never mattered in the end.
We’ll flag any specs that kill quote speed or push tooling out of control.
Gromax Precision Die & Mfg., Inc. specializes in designing and manufacturing precision metal stamped parts and tooling, including progressive stamping dies and custom equipment. With an on-time delivery rate of 99.68% and a defect rate of just 0.066%, the company ensures exceptional reliability and quality.
Gromax is ISO 9001:2015 certified and ITAR registered, serving industries such as medical, defense, aerospace, industrial automation, and automotive with high-quality, innovative solutions.