Custom Test Stand & Fixture Frames
A check fixture or test stand holds a part in a known position while it is measured or exercised, and the frame under the locators sets that position. K-Display makes the welded frame, delivered bare, coated and marked, or with plates, feet, and hardware fitted.
A welded frame under a precision fixture
A test stand frame holds the locators, clamps, and instruments in fixed positions to each other and to the bench or floor, and carries the cable and air routing for whatever measures or exercises the part.
The locating accuracy comes from ground or machined plates and blocks fastened to the frame, so the frame’s job is to present their mounting surfaces and hole patterns where the datum scheme puts them. Those plates can come from you or your toolmaker, or we machine and fit them with the frame.
The fixture plate carries the locators and clamp, while the welded rails present their mounting surface. Keeping these roles distinct makes clear which frame faces control the tooling’s position.
Frames and the features on them
- Frames for check fixtures and gauges
- Tube and plate frames with a top plate or rails that carry locator blocks, nests, and pins to your locator layout.
- Test stand frames
- Benchtop and floor-standing frames that hold a part or instrument during a test cycle, with mounts for clamps, sensors, and actuators.
- Fixture bases and instrument racks
- Base plates, tables, and shelved racks that carry a nest, an instrument, or a unit under test.
- Plate and riser mounting surfaces
- Pads, plates, and risers on the frame that take your locators and clamps, with faces machined or ground where the fixture needs them.
- Leveling and routing provisions
- Leveling feet or pads, cable and air rails, and removable panels welded or fastened where the stand needs them. Guard panels for the stand are made as described on Machine Guards & Access Panels.
What keeps the locator surfaces where the datum scheme puts them
- Datum scheme and locator surfaces
- The frame surfaces the locators mount to carry the part’s datum features into the fixture, so a weld near one can move it. We build the frame in a fixture referenced to those surfaces, keep welds away from them where the geometry allows, and balance the sequence where a weld has to sit close.
- Machined faces and dowel holes
- Mounting faces and dowel holes fix where the plates and blocks land, and welding moves both. We machine or grind the faces and ream the dowel holes after welding and before coating, and plan the welds and masking around that work.
- Loading and clamp reaction
- Clamp force reacts through the frame into the members under the locator plate, so the load path decides how far the mounting surfaces move in use. We build the members and bracing to the frame design and check deflection at those surfaces where the drawing sets a limit.
- Support and leveling
- A frame on four fixed feet can rock on a bench or floor that is not flat. We fit adjustable feet or leveling pads at the support points the frame calls for and locate their plates so adjusting a foot leaves the frame untwisted.
- Reachable fasteners, bare faces, and ID
- Locators, pins, and pads that wear or adjust need fasteners that stay reachable, and finished holes, threads, and mounting faces have to leave coating bare. We keep fastener access clear, mask those faces before powder coat, and apply the label, decal, or silk-screened ID and revision after.
From datum scheme to fitted frame
The datum scheme drives the order of work: weld locations, machined faces, and masking are set against it before the frame is tacked.
Review the datum scheme and the checks
Check the frame drawing against the locator and clamp drawings, confirm which surfaces and hole patterns control position, and agree which dimensions we check and report.
Cut, tack, and weld
Cut the members and plates, tack the frame in a fixture referenced to the mounting surfaces, and weld in a balanced sequence to limit distortion near them.
Machine, mask, coat, and fit
Machine or grind the mounting faces and ream dowel holes, then mask those faces and finished holes, powder coat, remove the masking, apply the identification, and fit feet, plates, and hardware. We check the agreed dimensions and send the readings.
Separate locating from fastening
Show the locator layout and the frame’s mounting surfaces together. Identify dowel holes separately from clearance holes, and leave fasteners reachable so a plate or wear component can be removed without dismantling the stand.
The dowels locate the plate; the screws hold it against the mounting pads. Bare contact faces preserve that seating relationship when the surrounding welded frame is coated.
What we need to quote the stand
The frame drawing and the locator layout start the quote. With no frame drawing yet, a part model with its datum scheme and a sketch of the stand is enough.
- Frame and locator drawings
- Member sizes, material, weld symbols, the datum scheme, mounting surfaces and hole patterns for locators and clamps, and the faces to machine and holes to ream.
- Part and loading
- The part or instrument the stand holds, its weight, where it is clamped and loaded, and the clamp force if known.
- Finish, masking, and marking
- Coating and color, faces and holes to keep bare, shipping protection for bare faces, and the label, decal, or silk-screen identification with its text or revision.
- Quantities and supply
- Number of stands, delivery date, which parts you supply (plates, locator blocks, clamps, feet, hardware) and which we purchase to your part numbers, and whether you want the bare frame, a coated frame, or a fitted frame.