Description
Description of the MST-FR20 Milling Machine Safety Guard
Protects the operator from rotating parts of the vertical spindle and helps contain the projection of shavings, chips and lubricant-coolant. The spring-assisted vertical opening offers system 60°–120°–180° positions for quick setups and access. Hexagonal support arms are widely adjustable and interchangeable to fit various fixing configurations. The shield-support hinge integrates a safety microswitch for electrical interlocking.
Advantages of the MST-FR20
- 60° / 120° / 180° vertical opening: fast access without disassembly
- Multi-position hexagonal arms: wide adjustment range and reversible configurations
- Semi-hexagonal shield: high visibility, wrap-around shape, shock-resistant and oil-resistant material
- Integrated interlock: prevents start-up when open
- Flexible installation: interchangeable arms to adapt to the machine
- Easy maintenance: shield can be replaced quickly
Main components (numbers refer to diagram)
- Anchorage stirrup - in pressed steel
- Straight support arm - in hexagonal steel
- Angular support arm - in hexagonal steel
- «Cross» clamp for arm adjustment - in pressed steel
- «Cross» clamp adjustment knobs
- Shield support hinge with integrated microswitch - n.2 NC contacts - electrically interlocked
- Semi-hexagonal shield - in plastic shockproof and oilresistant material
About the Interlock System
The interlocked system prevents machine start when the guard is open or not correctly positioned, helping reduce accident risk and supporting OSHA/ANSI/ISO-EN/CE compliance.
Interlock Switch Specifications
Contact arrangement: Two safety switches—2 NC contacts per switch
Switching ability: 4 A @ 24 V AC, 4 A @ 120/250 V AC
2 A @ 24 V DC, .4 A @ 120 V DC, .3 A @ 250 V DC
Mechanical life: 1 million switching cycles
Enclosure rating: IP 67
Écran de remplacement
Safety Guard's Technical Specifications
| CODE | Name | A | B | C | Spare Shield |
|---|---|---|---|---|---|
| MST-FR20/218 | Small Mills Safety Guard/218 | 250 mm 9 27/32" |
180 mm 7 3/32" |
110 mm 4 21/64" |
MST-FR20/218/SS |
| MST-FR20/320 | Small Mills Safety Guard/320 | 300 mm 11 13/16" |
200 mm 7 7/8" |
125 mm 4 59/64" |
MST-FR20/320/SS |
FAQ — Frequently asked questions
Does the Vertical Opening Restrict Access to the Work Area?
No. The 60° / 120° / 180° positions provide clear access depending on the operation.
Is the Guard Interlocked?
Yes. The hinge-integrated microswitch authorizes start-up only when the guard is correctly closed.
What Maintenance Do You Recommend?
Before use, inspect the shield (no cracks/splits) and test the microswitch. Clean the shield and guard surfaces regularly (machine stopped, trained personnel) to maintain clear visibility and interlock integrity.







