Is Your Machine Actually Supported, or Just Touching
the Floor?
Direct Answer: The Machine Is Down. But Is Every Support Actually Down?
A machine can look completely settled — all feet touching, jacks and skates removed — while its actual support condition is still uneven. A foot can hover a few thousandths of an inch above the floor, a leveling screw can be quietly carrying a corner instead of the base pad, a shim can have only edge contact, or debris trapped beneath a foot can become an unintended high point. The machine may not rock or show any visible sign of a problem. Touching is not the same as carrying, and a move isn’t truly finished until the machine’s intended permanent support system is actually the thing holding it up.
A Rigid Machine Can Sit Perfectly Still on Three Points, Not Four
This is the same geometry that matters during travel, covered on our page about how load distribution shifts across skates — three points can define a stable, rock-solid plane, while a fourth support merely touches without carrying meaningful weight. No rocking is required for this to happen; a rigid, well-built machine can feel completely stable while one corner is nearly unloaded. A business-card or feeler-gauge test can confirm a foot isn’t touching, but being unable to slide something into a gap doesn’t prove that foot is carrying its intended share of the load — contact and meaningful reaction are two different things.
Small Debris Can Become a Structural High Point
A weld spatter, a concrete chip, a stray washer, or a metal shaving lodged beneath a foot doesn’t necessarily flatten under machine weight the way people assume — a hard object can remain intact, and the rigid frame can bridge around it instead, turning that tiny contaminant into a genuine high point that lifts the opposite corner and redistributes reaction across the whole machine. Cleaning permanent bearing areas before final setdown is worth doing deliberately, and reaching underneath a fully loaded machine by hand to remove debris afterward isn’t the way to fix it — if the machine needs to come back up even slightly, that’s a real lift requiring the same care as any other: properly supported and controlled, not improvised.
Leveling Screws, Shims, and Anchors Can All Quietly Carry the Load
Many precision machines are specifically designed to bear on leveling screws or engineered pads as part of their intended support system — that’s not automatically wrong. The real question is whether everyone involved knows which components are actually meant to carry permanent load, and whether that’s what’s actually happening. A shim that only contacts along one edge, or a stack of mismatched scraps used in place of a proper engineered shim, can concentrate load in ways that aren’t visible from the outside.
Anchor bolts deserve particular caution: tightening one to pull a high corner down can look like it solved a seating problem, when it may have simply distorted the machine’s frame into contact rather than achieving genuine bearing. An anchor is meant to secure a properly seated machine — it isn’t a substitute for correcting an actual support problem underneath it.
The Frame Can Spring Back After the Last Jack Comes Out
A foot can look perfectly seated while a jack or a piece of cribbing is still partially engaged — and only once that last temporary support is truly unloaded does the frame’s stress state settle into its final condition, sometimes leaving a corner lighter than it appeared moments before. The true permanent support condition only exists after every piece of temporary equipment has genuinely stopped contributing, which is why final verification belongs after all rigging, jacks, and moving equipment are confirmed unloaded — not before.
Machinery Sliders Should Leave the Load Path When Their Job Is Done
A Machinery Slider’s job is to help position the machine — once that’s accomplished, the final permanent support should be whatever the machine’s actual installation design calls for, not the slider itself remaining pinched underneath a corner. Because sliders require relatively little lift height compared to bulkier moving equipment, the final transfer to permanent supports tends to be smaller and simpler — but a short transfer distance doesn’t guarantee correct seating. A machine can settle only a fraction of an inch and still land on debris, on an edge, or on the wrong shim. If a slider still seems to be carrying some reaction after setdown, don’t just pull it out — a low reaction is still a real reaction, and removing it is its own load-transfer event. See our page on final positioning corrections for the same underlying caution.
Watch How the Machine Accepts Weight During Final Setdown
As the machine lowers onto its permanent supports, which corner engages first tells you something real — if one support doesn’t take load until much later than the others, that’s worth investigating rather than ignoring. Listen for creaking or unexpected frame movement as the last temporary support unloads, and on precision equipment, consider checking level or geometry both before and after that final unloading — a support transfer or a subtle twist can show up in that comparison even when nothing looked wrong by eye.
False Seating Rarely Looks Dramatic
There’s usually no collapse, no visible tip, no injury. Instead, a poorly seated machine tends to show up later as premature bearing wear, unexplained vibration, cracked grout, or recurring alignment problems that technicians chase by adjusting the spindle or recalibrating software — when the actual cause is that the machine was never sitting correctly in the first place. Following the manufacturer’s specified installation sequence, and verifying support after temporary equipment is fully removed, catches this before it becomes an ongoing maintenance mystery.
Before Calling the Job Finished: A Quick Checklist
- Are all temporary supports — jacks, cribbing, skates, sliders — completely unloaded, not just loose-looking?
- What components are actually supposed to carry the permanent load — feet, leveling screws, shims, grout?
- Is there full, appropriate bearing at each support, or is any contact concentrated along just one edge?
- Is any debris trapped beneath a bearing surface?
- Did level or geometry change when the final temporary support was removed?
- Are anchor bolts being used to pull the machine into apparent alignment, rather than securing a genuinely well-seated machine?
Stop and reassess if: a foot remains visibly or measurably unsupported, a shim shifts or ejects, anchor tightening visibly draws a corner downward, grout or concrete cracks under load, or the final support condition doesn’t match the installation plan. Don’t answer an unknown support condition with more bolt torque — find the actual load path first.
Learn More: Frequently Asked Questions
Not necessarily. A rigid machine can bridge across an uneven floor, leaving one foot with light or negligible actual load despite visible contact.
Yes. Three support points always define a stable plane, and a machine can feel completely solid this way with no rocking at all.
Yes. Tightening an anchor to pull a high corner down can distort the machine’s frame into contact rather than achieving genuine, correct bearing.
Yes. A hard object doesn’t always crush flat under machine weight — it can remain as a high point that redistributes load across the entire machine.
No. If the machine needs to be lifted again, even slightly, treat it as a real, properly supported and controlled lift.
No. Their role is to help position the machine — final permanent support should follow the machine’s actual intended installation design.
Assuming the machine being down means the support is correct. Touching isn’t carrying, and level doesn’t prove load sharing.
Final takeaway: a machinery move doesn’t end when the machine reaches the floor. It ends when the temporary load path is gone, the intended permanent load path has genuinely taken over, and the machine sits where it belongs — without the rigging, without the jacks, and without being quietly forced into position.