5-Axis CNC Routing for Custom Industrial HDPE Parts (Sheet Arrays)

Blue Ridge Thermoforming (BRT USA) runs in-house 5-axis CNC equipment in Greenville, SC for two related but distinct jobs: trimming thermoformed parts after forming, and routing flat industrial HDPE sheet into custom arrays. This article is about the second job: sheet routing and hole arrays, not about finishing formed electronics enclosures.

If you need CNC trim after thermoforming for enclosures and kiosks, that is a separate published topic on BRT’s site. What follows is sheet fabrication language for industrial HDPE boards, with duct bank spacers as the clearest production example.

Routing vs trim-after-form

Trim-after-form starts with a thermoformed shell. The CNC removes flash, opens holes, and finishes edges so the formed part is assembly-ready.

Sheet routing starts with flat HDPE sheet. The CNC cuts the outer profile (when needed) and the hole pattern that defines the part’s function. No forming step sits in front of it. Duct bank spacers are this path: a flat board with holes that hold and space conduits in an underground concrete-encased bank.

Keeping the two paths separate matters for RFQs. A formed cover with trimmed openings is not a spacer. A spacer with a conduit hole array is not a thermoformed cover.

Hole arrays for industrial HDPE

Sheet routing shines when the drawing is a pattern of holes and centers:

• Conduit hole ODs matched to the schedule
• Rows × columns from the bank section
• Center-to-center spacing from the print
• Optional flow, rebar, and ground-wire holes
• Repeating boards for long runs (typically every 4-7 ft along a duct bank)

Typical spacer thickness is 3/8 in and 1/2 in HDPE. Ask which virgin or reprocessed grade fits the thickness on the print. Mixed conduit sizes on one sheet are routine when the section calls for them.

Other industrial HDPE sheet parts can use the same routing approach when the geometry is flat and hole-driven. Bring the drawing; do not invent a catalog part number that does not exist.

What we claim about accuracy

BRT’s public capabilities language for CNC work emphasizes precise trimming and drilling, complex shapes, and assembly-ready parts. In-house 5-axis CNC routing can keep trim and hole arrays in one shop instead of sending parts out for secondary trim. For duct bank spacers specifically, the commitment is geometric: hole arrays cut from your drawing or conduit schedule.

We do not invent tolerance callouts, EMI numbers, or lead-time guarantees in this article beyond what the live pages already say. If your print carries tolerances, send them with the quote package and we will review them against the process.

Greenville plant context

• Address: 184 Commerce Center, Greenville, SC 29615
• Equipment: In-house 5-axis CNC (sheet routing and trim-after-form)
• Quality: ISO 9001:2015 certified quality system
• Related forming envelope (thermoforming line): up to 60 × 100 in, material about 0.030-0.500 in
• Logistics: Jobsite ship, just-in-time, and offsite warehousing when staging is needed

Capabilities overview: /capabilities. Spacer product page: /duct-bank-spacers. Data-center bank types: /data-center-duct-bank-spacers.

How to quote a sheet-routed HDPE part

Send:

• 1. Drawing or conduit schedule (2D section is enough for spacers)
• 2. Material and thickness notes (or ask for a recommendation)
• 3. Quantity and revision level
• 4. Ship-to location and any staging needs
• 5. Whether the part is a duct bank spacer or another flat industrial HDPE array

Label the RFQ “CNC sheet routing” so it is not routed internally as a thermoforming job.

Example workflow: from conduit schedule to shipped boards

• 1. Customer sends conduit schedule or CAD section with ODs, rows, columns, and centers
• 2. BRT confirms thickness (typically 3/8 in or 1/2 in HDPE) and optional flow/rebar/ground holes
• 3. CNC program is built for the hole array (and profile if required)
• 4. Sheet is routed on in-house 5-axis equipment in Greenville
• 5. Boards are checked against the print, packed, and shipped to the jobsite or warehouse

That workflow is fabrication, not civil design. Spacing intervals along the trench, EMI clearances, and pour sequencing stay with the project team. BRT’s contribution is a board that matches the section so prefabrication and the pour can proceed without field-building the grid.

Capabilities cards on the live site explicitly note CNC-routed custom HDPE duct bank spacer boards from sheet: hole arrays for conduit banks, not thermoformed parts. This article exists to reinforce that sheet-routing framing and to avoid duplicating the separate electronics-enclosure CNC trimming article.

FAQ

Is this the same as CNC trimming for electronics enclosures?

Same plant and similar equipment family; different part path. Enclosure trimming finishes a thermoformed shell. This article is about routing flat HDPE sheet arrays such as duct bank spacers.

Are CNC-routed HDPE spacers thermoformed?

No. Spacers are sheet-routed only.

Can you cut mixed hole sizes on one board?

Yes. Hole diameter follows each conduit OD (or each hole callout) on the drawing.

Capabilities · Custom HDPE duct bank spacers