Resource
Plan vacuum zones on CNC beds for mixed part sizes without wasting hold-down or time. Here we show how South African teams make zone maps fit real work.
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Vacuum zone mapping is the practice of dividing a CNC machine bed into controlled suction regions. Each region, or zone, can be isolated or opened up to match the sheet area of the current job. This becomes essential when cutting a mix of large and small parts, as running the whole bed open for a small offcut wastes pump capacity and can cause parts to shift. In Gauteng, Cape Town, Gqeberha or Durban, where workshops often run multiple part sizes back-to-back, effective zoning means better grip, less tape-and-pray, and faster changeovers.
Vacuum zone mapping suits shops with CNC routers or nested-based CNCs that frequently swap between projects, especially where part sizes vary and sheet yields matter. Cabinet makers, sign shops, boat fitters, and shopfitting outfits around industrial parks in Germiston or Durban North benefit most, anywhere part cut quality and speed matter. If you run a single large production nest per day, or only process full sheets of identical size, mapping out individual zones adds little value and may slow you down. Workshops without reliable vacuum or those relying on manual hold-downs should address those fundamentals first.
The operator starts with a plan of the machine bed, marking out major grid lines, often 100 mm or 150 mm squares. Zones are then sketched to match typical job layouts or the most common nest zones seen in your production run. In a Germiston workshop, this usually means a handful of smaller rectangles near the home corner for short-run jobs, with a couple of broad strips for long boards common in shopfitting. On older beds, some teams use painted lines for a fast visual check, while others print a zone map and keep it clipped to the bay wall next to the kerf log template and nest checklist.
Cut2Shape provides a vacuum zone mapping resource as a worked template. Teams send a message through our contact form with their machine specs and preferred grid size. We reply with a mapped PDF suited to most colonial or metric CNC beds found in South African shops. For teams assessing or buying a machine, you can compare what other locals have mapped via our machines hub.
A cabinet shop in Germiston runs a 2.4 x 1.2 metre CNC bed, cutting both full carcass panels and small drawer fronts daily. The foreman maps out five vacuum zones: two large zones for full boards, three smaller squares near the origin for batch runs of smaller parts. On a day with mixed jobs, the operator opens only the required zones. When running a stack of small pieces, they shut off the main bed zones, boosting hold-down on the small area and cutting cleaning time. The zone map is referenced whenever a new nest comes through. This limits vacuum loss and prevents offcuts from lifting, especially during those Highveld winter afternoons when static makes small parts fly.
Preparing the right details up front saves time. Most requests from Germiston, Cape Town or Bloemfontein include a quick sketch of the bed layout, current vacuum points, and typical part nests loaded into the machine. Teams should check the machine’s bed size, note any existing vacuum zone valves or manual slides, and summarise the range of sheet sizes commonly cut. A clear photo of the current table also helps. If you have specific issues, like repeated part slips or odd-shaped offcuts, make a note.
We turn your info into a PDF zone map for your team’s next run. Larger or custom beds may need a short call to clarify points. If you want to see examples, check projects or our main resources page.
South African teams run into similar pitfalls when mapping vacuum zones. The most common is mismatched grid sizes: trying to use a single zone for wildly different part runs leads to grip loss or wasted pump power. Over-zoning, splitting the bed into too many tiny zones, can mean extra steps and delays mid-shift. Some operators skip regular maintenance, causing slow leaks that even the best map can’t fix. Others mislabel zone taps, which leads to confusion when a new operator rotates in.
To avoid these issues, regularly review which zones are opened most. Mark valves clearly and add zone names to the printed map. Keep a copy clipped up with other resources and update the map if nests or sheet types are changed regularly. Where possible, walk new operators through the zone logic during induction, pointing out areas most affected by Highveld dust or humid coastal air, which can affect vacuum seals.
