Optima Precision

San Jose CNC machine shop doing 5-axis machining, milling and turning for semiconductor, aerospace, medical and robotics customers.

Capabilities

• 5-axis CNC machining
• CNC milling
• CNC turning
• Tight tolerance machining
• Prototype CNC machining
• Short-run production

Materials

Aluminum, Stainless steel, Brass, Titanium, Plastics.

Quality & certifications

AS9100D, ISO 9001:2015, ISO 13485 (as stated on site).

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To request a quote from this shop, use the Request a Quote form. Tell us the part, material, quantity and deadline, and we will pass your request to the shop.

Tight Tolerance 5-Axis Machining in San Jose with Optima Precision

Tight tolerance work is where machining skill shows. A hole must be round and in the right place, a surface must be flat and a dimension must repeat from part to part. Optima Precision is a San Jose CNC machine shop listed here for 5-axis machining, milling and turning for semiconductor, aerospace, medical and robotics customers, with tight tolerance machining, prototype CNC machining and short-run production, in aluminum, stainless steel, brass, titanium and plastics. The listing shows AS9100D, ISO 9001:2015 and ISO 13485, as stated on the site. This page explains tight tolerance work and how to prepare a request for 5-axis machining in San Jose.

What tight tolerance really means

A tolerance is the allowed variation in a dimension. A tight tolerance means that variation is small, sometimes a few ten-thousandths of an inch. To hold it, a shop needs a stable machine, good tools, careful setups and measurement that can see the differences. Tight tolerances cost more than loose ones, so apply them to the features that need them.

5-axis machining and tolerance

A 5-axis machine can cut features on several faces of a part in a single setup. Features made in one setup have a known relationship to each other, which helps when a drawing asks for tight position tolerances between faces. That is one reason precision work often uses 5-axis machines for complex parts.

Milling and turning

Milling and turning are the two core processes. Milling cuts blocks, plates and housings. Turning cuts round parts such as shafts and bushings. If your part includes both, tell the shop.

Materials on the listing

The listing names aluminum, stainless steel, brass, titanium and plastics. Each reacts to heat and tool pressure differently. Aluminum grows more with heat. Titanium can spring back. Plastics can shift as stress releases. Tell the shop which dimensions are most critical, so the process can protect them.

Industries named

The listing names semiconductor, aerospace, medical and robotics. These are fields where precision matters. If your product has regulations or customer documents, list them in the request. Do not assume the paperwork will arrive unless it is in the quote.

Quality systems on the listing

AS9100D is a quality standard for aerospace. ISO 13485 applies to medical devices. ISO 9001 is a general standard. Having more than one listed suggests that the shop works with systems that include records and traceability. Ask what documents are provided with each order.

Prototype and short runs

The listing names prototype CNC machining and short-run production. These suit new designs and low-volume products. A short run is also a good bridge before a larger commitment.

How to prepare a drawing for tight work

• Mark critical dimensions and datums clearly
• Use general tolerances for non-critical features
• Say how the part will be measured
• List any surface finish needs
• Note any cleaning or packaging needs

What to include in an RFQ

• Drawing and 3D model with revision
• Material and grade
• Quantity now and later
• Critical tolerances and measuring method
• Finish and cleaning needs
• Inspection reports or certificates
• Delivery date

Why a San Jose shop is useful

In the middle of Silicon Valley, a San Jose shop is near many equipment and device makers. That helps teams that iterate quickly on precision parts.

Questions worth asking about tight work

Ask how the shop will verify the critical features and what measuring equipment is used. Ask whether the first part can be inspected before the rest of the lot is cut, and how out of tolerance parts are handled. Ask what lead time to expect for a first order. Answers to these questions show how a shop plans precision work, and they help you compare quotes on the same basis.

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