CNC Vacuum Pad, Sponge or Cup: How to Identify the Part
Belfa Makine
Searches for “vacuum pad,” “vacuum sponge,” and “vacuum cup” may point to parts in the same CNC vacuum-table area, but the names do not always describe the same component. To identify the right part, check the table layout, how the old component seats, and its mounting interface instead of relying on the search term or appearance alone.
Manufacturer Schmalz says suction-cup selection depends on the application and that the workpiece surface and system conditions matter. It recommends vacuum trials for porous workpieces. Do not infer holding force or machine compatibility from a product name or one measurement.
Distinguish a vacuum cup, pad, and sponge
| Component | Details to record during identification |
|---|---|
| Vacuum cup / suction cup | Cup profile, sealing edge, connection, and seating face |
| Vacuum pad | Outside dimensions, underside seating face, and the connection or vacuum passage shown in the drawing |
| Vacuum sponge / table sponge | Location on the table, cross-section, and the channel or support surface it sits in |
These are general identification prompts. The machine maker's parts catalogue and technical drawing should guide identification for a specific model. Components that look similar can differ at the contact face or mounting interface.
Illustrative only; does not depict a specific catalogue SKU or claim machine compatibility.
Document the old part and table interface
Take a wide photo of the component in place, then close-ups of its front, side, and underside. For a pad, show the outside dimensions and underside connection; for a cup, show the profile and sealing edge; for a sponge, document its position and cross-section in the channel. Show which surfaces you measured and state the unit.
Record the machine's full model, serial number, table type, and any code on the old part. If the code is unreadable, describe where the component sits and its orientation. Before treating another design as compatible, compare the mounting details against the machine catalogue or technical drawing.
The diagram shows general component shapes; it does not specify dimensions or compatibility.
Get the proposed match confirmed in writing
Send the supplier the machine identity, component type, old part code, and photos together. Ask which catalogue or drawing supports the proposed code. Until the part code and mounting interface are confirmed, “vacuum pad,” “vacuum sponge,” or “vacuum cup” alone is not enough to establish a match.
Browse Belfa's CNC spare parts collection and the existing CNC parts guide about searches for machined components versus machine spares.
Frequently asked questions
Are a vacuum pad and a vacuum sponge the same part?
Search terms can overlap, but the component shape, seating location, and mounting may differ. Compare the old part with the machine drawing.
Can I choose a vacuum pad by length and width alone?
Those measurements may not be enough. Record thickness, underside connection, and vacuum passage details as well.
Will vacuum holding behave the same on porous board?
Application and surface conditions can affect the result. Follow the machine maker's instructions; Schmalz recommends trials for porous workpieces. This article is not a holding-force calculation or safe-operation approval.
Sources: Schmalz: suction-cup design; Schmalz: vacuum clamping technology.