TL;DR
Lost hold-down allows workpieces to shift during routing, causing scrap and tool breakage. Check the vacuum pump, table sealing gaskets, and worktop perforations for blockage.
What you might see
- workpiece shifting during cutting
- vacuum level gauge reading below setpoint
- part position errors triggering over-cut
- vacuum pump running continuously without reaching setpoint
Likely causes
Vacuum pump wear reducing flow capacity
Table sealing gaskets worn or damaged allowing air infiltration
Worktop perforations blocked by sawdust or adhesive residue
Vacuum circuit valve not fully open or leaking
Required tools
- Vacuum gauge
- Compressed air
- Brush for perforation cleaning
- Replacement gaskets (table type and size)
Safety first
- Workpieces that lose hold-down can be ejected by the cutter at high speed. Do not run production if vacuum level is below hold-down minimum for the workpiece material.
- Wood dust on and around the table is a fire and explosion hazard. Clean the table area thoroughly before any inspection or maintenance.
Procedure
- 1
Check the vacuum gauge at the table surface. Note the actual level versus the setpoint for the material being held.[1]
- 2
Listen for air leaks around the table perimeter and zone dividers. Use a lit incense stick or foam applicator to locate infiltration points.
- 3
Inspect the table sealing gaskets at the perimeter and zone separators. Compressed or cracked gaskets reduce sealing significantly.[1]
- 4
Clean all worktop perforations with compressed air and a brush. Sawdust accumulation is the most common cause of gradual hold-down loss.
- 5
Check the vacuum circuit isolation valves for each zone. Confirm they are fully open and seated correctly.
- 6
Measure vacuum pump inlet pressure. A pump pulling significantly below its rated vacuum level indicates pump wear or a blocked inlet filter.
- 7
Replace worn gaskets and clean or replace the vacuum pump inlet filter. Test hold-down with a trial piece before running production.
Sources
SCM SCM Morbidelli M / X CNC Router (Wood / Furniture) general technical documentation, SCM
CNC router vacuum table maintenance and hold-down verification, general wood CNC practice (general)
More guides for SCM SCM Morbidelli M / X
How to diagnose axis positioning error on an SCM Morbidelli CNC Router
Axis positioning errors cause part dimension drift. Check drive belt tension, ball screw lubrication, and encoder feedback for the affected axis before running a diagnostic cut.
How to diagnose spindle runout and vibration on an SCM Morbidelli CNC Router
Spindle runout causes chatter marks and oversize cut dimensions. Measure runout with a dial indicator, check tool holder seating, and inspect spindle bearings for wear.
Stop fixing the same fault twice.
Dovient turns guides like this into your team's shared playbook, with AI that catches recurring issues before they break the line.