Production delays are frustrating at the best of times. But when the root cause is traced back to the design phase — something that happened weeks or months before manufacturing even started — they are also entirely avoidable.
At RAAMPS INDUSTRIES, we work with engineers and procurement teams across India on industrial part design and fabrication. One of the most consistent patterns we see is that design-stage decisions made without manufacturing input end up costing clients time, money, and rework further down the line.
This post covers the five most common industrial part design mistakes we encounter, why they cause delays, and what good industrial design services do to catch and correct them before production begins.
Why the Design Phase Has Such a Large Impact on Lead Times
In industrial manufacturing, the design phase is where the entire production journey is set up for success or failure. A part that is well-designed for manufacturability can move smoothly from drawing to finished component with minimal back-and-forth. A poorly designed part, on the other hand, generates a series of conversations, change requests, trial-and-error runs, and sometimes complete redesigns — all of which add days or weeks to your timeline.
The principle behind this is often called Design for Manufacturability (DFM). It simply means designing parts with the actual manufacturing process in mind, not just the intended function of the finished part.
Mistake 1: Over-Tight Tolerances on Non-Critical Features
Tolerance is the allowable variation in a dimension. Tight tolerances are necessary on features that directly affect assembly fit or function — a shaft diameter that interfaces with a bearing, for instance. But applying tight tolerances uniformly across all dimensions of a part is a common and costly mistake.
Why it causes delays: Achieving tight tolerances requires slower machining cycles, more frequent in-process measurement, higher tooling costs, and sometimes entirely different manufacturing processes. When a drawing calls for 0.01mm tolerances on a surface that does not need them, you are paying for precision that adds no value — and waiting longer for it.
How to avoid it: Work with an industrial design services partner who applies tolerance analysis to the design. Critical interfaces get the tolerances they need. Everything else is specified with standard manufacturing tolerances, which are faster and more cost-effective to hold.
Mistake 2: Internal Radii That Are Too Small for Standard Tooling
Internal corners in machined or pressed parts require a radius rather than a sharp 90-degree corner, because cutting tools and dies are round. When the design specifies a smaller internal radius than available tooling can produce, the manufacturer either has to source or grind a special tool — or push back to the designer.
Why it causes delays: Special tooling takes time to source or manufacture. In some cases, it requires a separate supplier, extended lead times, and higher costs. Meanwhile, production is on hold.
How to avoid it: Design internal radii to match standard tooling sizes for the intended process. For CNC machining, this typically means aligning internal radii to standard end mill diameters. For sheet metal bending, minimum inside radii should match the standard tooling in your fabricator’s press brake inventory. A good industrial design services team will know these constraints and design accordingly.
Mistake 3: Insufficient Draft Angles on Cast or Moulded Components
Draft angle is the degree of taper applied to the vertical walls of a component designed for casting or moulding. Without adequate draft, the part cannot release cleanly from the die or mould.
Why it causes delays: Parts without proper draft angles either require modified tooling, result in damaged components during ejection, or require a redesign once the problem is discovered at tooling validation. Any of these outcomes adds significant time to the project.
How to avoid it: Draft angle requirements depend on the process, material, and surface finish. Die casting, sand casting, and injection moulding each have different standard draft requirements. These should be designed in from the start — not added as an afterthought. If you are working with an industrial design services partner, this is a fundamental part of the DFM review they should be providing.
Mistake 4: Designing Features That Require Multiple Set-Ups to Machine
Complex parts often need to be machined from multiple angles. Every time a part is repositioned on a machine, it requires a new set-up — clamping, probing, and re-establishing datum references. This takes time, and each set-up introduces a small opportunity for error.
Why it causes delays: More set-ups mean longer machine time per part, increased risk of datum drift between set-ups, and a higher probability of rework. On high-volume orders, this compounds significantly.
How to avoid it: Good industrial part design aims to minimise set-ups by orienting features so that as many as possible can be accessed from one or two machine positions. This is sometimes called machining from one datum — and it is something experienced engineers consider at the design stage rather than the machining stage.
Mistake 5: Inadequate Wall Thickness for the Selected Material and Process
Minimum wall thickness depends on the material, the manufacturing process, and the structural requirements of the part. Walls that are too thin may not fill properly in casting, may deform during machining, or may not survive the loading conditions they are designed for.
Why it causes delays: Discovering a wall thickness issue in production means either scrapped parts, a process workaround that adds cycle time, or going back to the design team for a revision. In some cases, the tooling needs to be modified as well.
How to avoid it: Minimum wall thickness guidelines exist for every major manufacturing process. These are not arbitrary — they reflect the physics of material flow, cutting forces, and structural loading. When reviewing a design, RAAMPS checks wall thickness against process-specific limits before committing to production.
The Value of Catching These Issues Early
There is a well-established principle in manufacturing that the cost of fixing a design issue increases at every stage of the process. Catching a tolerance issue on a drawing costs almost nothing to fix. Catching it after tooling has been made is expensive. Catching it after a production run has been completed can be catastrophic.
This is why the best industrial design services are not just about creating drawings — they are about applying manufacturing knowledge to ensure those drawings produce parts that can actually be made efficiently, at scale, and within budget.
How RAAMPS INDUSTRIES Supports Better Industrial Part Design
RAAMPS works with clients at multiple stages of the design process. For some clients, we review and provide DFM feedback on existing designs. For others, we collaborate from the concept stage, bringing our manufacturing experience into the design itself.
Either way, our goal is the same: to make sure your parts are designed to be made — not just designed to function.
If you have an upcoming project and want to discuss it with our team, we are happy to review your drawings and provide honest, practical feedback before production begins.
Frequently Asked Questions (FAQs)
1. What does Design for Manufacturability (DFM) mean?
Design for Manufacturability is the practice of designing parts and products with the actual manufacturing process in mind. It means making design decisions that consider how a part will be made — what machines, tools, and processes will be used — so that production is efficient, accurate, and cost-effective.
2. Why do tight tolerances cause production delays?
Tight tolerances require more precise machining, slower cutting speeds, additional measurement steps, and sometimes specialist equipment. When tight tolerances are applied to non-critical features, they add cost and time without adding value to the part’s performance or assembly fit.
3. What is a standard internal radius for CNC machined parts?
Standard internal radii for CNC machining are typically aligned to common end mill diameters — 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, and so on. Specifying a radius that falls between standard tool sizes requires either a custom tool or a secondary hand operation, both of which add time and cost.
4. How much draft angle is typically required for die casting?
Draft angle requirements vary by material, die condition, and part geometry. As a general guide, external walls typically require at least 1 to 3 degrees of draft, while internal walls may require 2 to 5 degrees. The specific requirement should be confirmed with your manufacturing partner based on the material and process being used.
5. What is a machining set-up and why does minimising them matter?
A set-up is the process of mounting, aligning, and preparing a workpiece on a machine before cutting begins. Each set-up takes time and introduces the possibility of minor positioning error. Minimising the number of set-ups reduces machining time, lowers the chance of error, and makes the part faster and cheaper to produce.
6. How does wall thickness affect manufacturability in casting?
In casting, walls that are too thin may not fill completely with molten metal, leading to voids or incomplete sections. Walls that are too thick cool unevenly and can cause shrinkage defects. Designing wall thickness within the recommended range for the specific casting process and alloy ensures consistent, defect-free results.
7. At what stage should DFM review happen?
Ideally, DFM review should happen as early as possible — during the concept or early design stage. The later a design issue is identified, the more expensive and time-consuming it is to correct. At a minimum, a DFM review should be completed before tooling is ordered or production is committed to.
8. Can RAAMPS INDUSTRIES review my existing drawings for manufacturability?
Yes. RAAMPS provides DFM reviews for clients who already have drawings or 3D models. Our team will assess the design against our production capabilities and flag any issues related to tolerances, features, material selection, or process suitability before production begins.
9. What is the difference between industrial design services and product design services?
Industrial design services focus on parts and assemblies for industrial applications — machinery, equipment, enclosures, structural components, and similar products. Product design services typically refer to consumer-facing products. Industrial design services place a stronger emphasis on functional performance, material specification, manufacturing process compatibility, and in-service durability.
10. How do I know if my part design is ready for production?
A design is production-ready when it has been reviewed for manufacturability, all tolerances are appropriate to the function of each feature, material and process selections are confirmed, and any known design risks have been addressed. Working with an experienced industrial design services partner or fabricator during this review process significantly reduces the risk of discovering issues once production has started.
