SLM AIR ISOLATORS

Low frequency high performance shock and vibration isolator for passive and active applications

Construction

Moulded CR (Neoprene) oil resistant and non ageing rubber upper chamber with integral aluminium (SLM 1-12) and zinc plated steel (SLM24+) support plate with tapped attachment hole, side wall reinforcement and integral base ring bolted and sealed onto a aluminium (SLM 1-12) and zinc plated steel ( SLM24+) baseplate.
Baseplate can be bolted down to support surface if required. Standard version with Schraeder Inlet Valve.
Other valves on request.

Features

Ratio of vertical to horizontal stiffness ca 1:1 Shock absorption amplitude up to 15mm
Natural Frequency range (depending on load) 2.8-5 Hz (see table). Deflated (no air pressure): ca 8Hz See Load Spreader Plates LSP.

Applications:

CMMs, Surface Plates, Presses, Test Beds, Turret Punch Presses, HVAC Scientific and Test Equipment.

Levelling Range

+/- 5 (6)mm (see table)

Delivered with Grade 8.8 Zinc plated attachment screw (Other screw lengths available)

Control Systems

Self controlled levelling versions available with either mechanical-pneumatic or electro-pneumatic controllers.
Full proposals on application

Accessories

Load spreader plates LSP, It is important that the foot of the supported equipment covers the SLM fully.

Load spreader plates LSP can inserted between the top of the SLM and the underside of the machine foot if necessary.

Applications

Coordinate Measuring Machine (CMM) installed on Farrat SLM Air Mounts

SLM Isolators
Model	Load capacity		Maximum Pressure bar
	Load capacity				Empty Height		Attachement screw Thread		Max. Foot	Levelling Adjustment		Base	Fixing Hole Ctrs	Fixing Hole Dia	Base thickness	Unit Mass
	Min. kN	Max kN		D mm	Ho	D1 mm	M mm	L mm	thickness mm	Le mm	X mm	L mm	C mm	d mm	t mm
SLM 1 A	0.1	0.65	5	73	65	28	M10x1.5	80	50	+/- 5	12	75	60	7	3	0.3
SLM 3 A	0.35	1.8	5	105	65	52	M12x1.75	100	65	+/-5	12	105	89	7	3	0.7
SLM 6 A	0.7	2.8	6	127	90	60	M12x1.75	100	65	+/-6	15	130	108	7	3	1
SLM 12 B	1.35	6	6	172	90	96	M12x1.75	100	65	+/-6	15	175	153	7	3	1.8
SLM 24 A	2.7	13	6	245	90	138	M16x2	120	75	+/-6	15	255	215	14	5	5.4
SLM 48 A	5.5	26	6	338	90	205	M16x2	120	75	+/-6	15	343	305	14	5	10.7
SLM 96 A	11	55	6	468	90	300	M24x1.5	130	75	+/-6	15	470	406	20	6	29.1
SLM 192 A	22	100	6	610	90	430	M24x1.5	130	75	+/-6	15	610	508	20	6	38.6

Order example SLM 24 A M16x120

Natural Frequencies v load v air pressure
Air Pressure	bar	1	2	3	4	5	6
Vertical Natural Frequency	Hz	5.6	4.2	3.6	3.2	2.9	2.7
Horizontal Natural Frequency	Hz	5.6	4.2	3.6	3.2	2.9	2.7
Model		Maximum Static+Dynamic Load per unit kg (daN)
SLM 1 A		5	25	38	52	65
SLM 3 A		33	78	123	155	180
SLM 6 A		55	112	178	224	260	280
SLM 12 B		110	190	300	390	450	600
SLM 24 A		220	500	800	1000	1160	1300
SLM 48 A		360	1000	1600	2000	2300	2600
SLM 96 A		1050	2100	3400	4200	5000	5500
SLM 192 A		1700	3900	6100	7700	9000	10000

SLM Load Spreading Plates LSP
LSP	For	Do mm	Di mm	t mm	Mass kg
100	SLM 1	100	11	6	0.5
120	SLM 3/6	130	13	8	0.8
175	12	175	13	10	2
240	24	240	17	10	3.6
380	48	380	26	12	10.3
550	96/192	550	26	15	28

Silver Painted steel plate
Order example LSP 100

ATTENTION

Do not exceed:

Maximum Pressure:
SLM 1 and 3: 5 bar
SLM 12-192: 6 bar
Maximum Working Height:
SLM 1 and 3: 70mm
SLM 12-192: 96mm

Do not pressurise unit without load or restricting vertical movement

1. Pre-installation: Ensure floor is flat and free of debris. Ensure unit’s bearing plate is totally covered by machine foot (use spreader plate where necessary)

2. Installing: Lift the machine to the required height using jacks or levelling units. Slide units into position ensuring valves are accessible. Insert packing plates as necessary (ensure bearing plate will not tilt when units are pressurised.)

3. Fixing: Fix the stud in position using low torque only. Assemble clamping nut and washer

4. Levelling: Pressurise units to a height at or near the maximum Ho+5 (6), ensuring that the maximum pressure allowed is not exceeded. Deflate units in small steps to level machine as necessary, ensuring minimum height

Ho-5 (6) is not exceeded. If necessary repressurisation may be required during leveling. In which case do not exceed maximum pressure 5 (6) bar and/or height Ho+5 (6). Continue leveling until height tolerance and desired levels are reached..

5. Anchoring: Units can be anchored to the floor using the base plate holes.

6. Service: It is recommended that the unit pressure be measured at least once a year Machine should be out of action before pressure checks are taken

7. Dismounting: Units must be fully deflated before removal from under machine. Provision should be made for machine support during deflating operation.

8. Depressurisation: In the event of complete loss of air pressure and machine foot (with or without Load Spreader Plate LSP) covers the SLM completely, the machine base will come in contact with the side walls which are designed to support load well in excess of inflated loading. However in deflated condition the vibration isolation properties will be reduced.

If foot of machine/equipment does not cover the SLM fully, use relevant LSP spreader plate between SLM and machine foot.

Farrat

ANTI VIBRATION &LEVELLING MOUNTS