DFM-40-B - Industrial pneumatic component Festo - Free user manual and instructions

Product Type	Guided Pneumatic Cylinder
Brand	Festo
Model	DFM-40-B
Bore Size	40 mm
Stroke Length	Up to 500 mm (typical)
Operating Pressure	2 to 10 bar
Operating Temperature	-20 to +80 °C
Weight	Approx. 2.5 kg (depending on stroke)
Dimensions (Length x Width x Height)	Approx. 200 x 80 x 80 mm (without stroke)
Guide Type	Ball bushing guide
Position Sensing	Compatible with proximity sensors (e.g., SME/SMT)
Mounting Type	Via threaded holes and accessories
Piston Rod End	Internal thread (M8 or M10 typical)
Main Functions	Linear motion with precise guidance
Maintenance	Periodic lubrication of guide rails; check seals
Cleaning	Wipe with dry cloth; avoid aggressive solvents
Safety Precautions	Depressurize before maintenance; avoid exceeding max pressure
Spare Parts	Seals, guide bushings, piston rod (contact Festo)
Repairability	Seals and guide bushings replaceable; cylinder can be disassembled
Certifications	CE, RoHS, REACH

Frequently Asked Questions - DFM-40-B Festo

What is the bore size of the Festo DFM-40-B?

The bore size is 40 mm, as indicated by the model number.

What is the maximum stroke length for this cylinder?

The stroke length can be customized up to 500 mm. Check the product documentation for exact options.

What operating pressure does the DFM-40-B require?

The recommended operating pressure range is 2 to 10 bar. Do not exceed 10 bar.

Can I use proximity sensors with this cylinder?

Yes, the DFM-40-B has slots for proximity sensors such as Festo SME/SMT series.

How do I mount the DFM-40-B?

The cylinder has threaded mounting holes. Use appropriate brackets or foot mounts from Festo accessories.

What maintenance is required?

Periodically lubricate the guide rails and check seals for wear. Keep the cylinder clean from dust and debris.

How do I clean the cylinder?

Wipe with a dry, lint-free cloth. Avoid aggressive cleaning agents that may damage seals.

What safety precautions should I take?

Always depressurize the system before maintenance. Ensure the cylinder is not operated beyond its rated pressure and temperature.

Are spare parts available for the DFM-40-B?

Yes, spare parts such as seals, guide bushings, and piston rods are available from Festo or authorized distributors.

Can I repair the cylinder myself?

Basic repairs like replacing seals and bushings are possible. Disassembly instructions are in the manual. For complex issues, contact Festo service.

USER MANUAL DFM-40-B Festo

Assembly instructions (Original instructions)

8063354

2017-04e [8065800

FESTO

Guide unit

DFM-...-B

Festo SE & Co. KG

Ruiter Straße 82

73734 Esslingen Germany

[phone]

www.festo.com

1. Applicable documents

All available documents for the product → www.festo.com/pk

2. Safety

- Switch off compressed air before mounting work.

- Protect the positioning range from access.

- Keep foreign objects out of the positioning range.

3. Intended use

Stop, stopper cylinder or a single-axis feeding unit with larger loads on the yoke plate.

4. Further information

Characteristic curves and permissible limits → www.festo.com/catalogue Accessories (e.g., slot cover ABP) → www.festo.com/catalogue

1. Scope of delivery
   

1. Not in scope of delivery
   

7 Screw (2x)

1) Required surface (I) evenness precision only in case of the GF variants:

DFM-12 ... 20-B = 0.02 DFM-25 ... 63-B = 0.05

In case of non-observance of the evenness precision, guide rods can become jammed.

2) The usage of centring sleeves is not possible for DFM-20 ... 40-B and mounting variant d

3) In the case of DFM-...-B-...-E], the mounting variant d) is possible only to a limited extent,

since the fastening holes are largely covered.

4) Additional, required dimensions of the guide units 1 through 5 can be found in the

catalogue (→ www.festo.com/catalogue)

7. Mounting, general

→ Note

In order to avoid operative malfunctions and increased wear:

- Observe the characteristic curves and permissible limits

- Handle the guide units 1 through 5 in such a way that the guide rods and piston rod are not damaged.

• Ensure that the mounting surfaces (H) and (I) are flat.

• Install guide units 1 through 5 without distortion

Mounting variants:

a) Flat from on top

c) Lateral from underneath

b) Flat from underneath

- Use the following screws 7 and centring sleeves 6, depending on the mounting variant:

DFM----B (a) b) c) + d) Yoke plate (J)
12	M4	ZBH-9	M5	ZBH-9	M4	ZBH-5		M4
16		M6		ZBH-7	M5
20	M5					2)		ZBH-9
25					M6
32	M6	ZBH-12	M8	ZBH-12		ZBH-92)
40					M8
50						ZBH-12	M8	ZBH-12
63	M8		M10	M10		M10

- Provide mounting holes for the centring sleeves 5 on the surfaces (H) and (I) ^4 .

ZBH		5	7	9	12	15
D1 ^H7	[mm]	5	7	9	12	15
T1 min.	[mm]	1.4	1.4	1.9	2.4	2.9

i Information

To mount guide units 1 through 5

- If possible, use screws 7 with a screw-in length of 1.5 × d^4)

- Fasten the guide unit according to load, size and stroke length, but with at least 2 screws 7.

X≈1.5

→ Note

To mount the variant d):

With protruding guide rods in the retracted state:

- Ensure there is clear passage of the guide and stop rods, e.g. through grooves in the mounting surface (H).

8. Mounting the proximity sensors

When intermediate strokes are being sensed, the proximity sensor can be at the level of a fastening hole (K) and not fastened.

• Take the following assembly alternatives e) through g) into consideration:

e) Offset the proximity

sensor 8 within its

operating path (b) by 6 mm.

f) Rotate the proximity

sensor 8 by 180°.

g) Select another permissible proximity sensor

(→ www.festo.com/catalogue)

- As required, cover the sensor slots with a slot cover ABP 9 and use them to fix the cables into place (→ More detailed information).

9 Stroke adjustment

9a. For guide units 2 through 4 (no metallic stop)

• Vent the guide units 2 through 4.

→ Note

To avoid the unintentional loosening of the piston rod:

- When loosening and tightening the lock nut (F), counterhold the stop nut (G).

Retracted end position (EJ)

Loosen the lock nut (D).Adjust the stop rod (Y) with the internal hexagon socket (E).Shorten the stroke by a maximum of 10 mm.	Loosen the lock nut (F).Adjust the stop nut (G).Shorten the stroke by a maximum of 10 mm.
Tighten the lock nut (D). Observe the tightening torque M_M1 (→ Table).	Tighten the lock nut (F). Observe the tightening torque M_M2 (→ Table).

- Vent the guide units 2 through 4

• Start the test run. Check the set stroke.

5) Tolerance for tightening torques M_A with no indication of tolerance: ± 20%

9b. For guide unit 5 (metallic stop)

DEM-...-B-YSRW

- Vent the guide unit 5.

→ Note

• To reduce the shortening of the stroke dimension a by a maximum of 10 mm

and enlarge it by dimension I by a maximum of 10 mm (→ Section 11).

- Do not exceed fall short of dimension a/l since the shock absorber

performance is otherwise strongly reduced.

- Adjust the shock absorber (B) to dimension a/l as follows:

Retracted end position

Loosen the lock nut (A)/screw (C).Adjust the shock absorber (B).Observe dimension a. Shortened the factory-set stroke by a maximum of 10 mm (→ Table).	Loosen the lock nut (A)Adjust the shock absorber (B).Observe dimension l. Increase the factory-set stroke by a maximum of 10 mm (→ Table).
Tighten the lock nut (A)/screw (C).Observe the tightening torque M_A1 (→ Table).	Tighten the lock nut (A). Observe the tightening torque M_A2 (→ Table).

- Vent the guide unit 5.

• Start the test run. Check the set stroke.

10. Maintenance and care

10a. In case of guide unit 5

During operation, the viscosity of the hydraulic oil reduces due to friction heat.

→ Shock absorber reset times become shorter (hard knocking).

At low temperatures around 0°C, the viscosity of the hydraulic oil rises.

→ Shock absorber reset times become longer.

The moving mass should always reach the end position safely, but not knock hard against it.

• The shock absorbers should be replaced when their functioning / shock-

absorbing performance is no longer ensured due to excessive wear.

- Check the cushioning regularly for the following signs of wear:

– Oil leakage

– Hard knocking

- Stop rod remains in retracted end position / moves slowly from end

position

• The following environmental conditions shorten the test intervals:

– High thermal stress

– Severe accumulation of dirt

– Proximity of grease-dissolving liquids or vapours.

• Exchange the shock absorber (B) after 10 million strokes (→ Section 9b).

1. Dimensions, widths across flats and tightening torques M_A^5)

DFM----B			12/16	20	25	32	40	50	63
EJ	D	⩽≦	–	8	13	13	13	17	17
	M_b1	[Nm]	–	3	7	10	10	24	24
	E	⩽≦	–	2.5	4	4	4	5	5
AJ	F	⩽≦	10	13	17	17	17	19	19
	M_b2	[Nm]	1.7	3	6	10	10	16.5	19
	G	⩽≦	17	19	24	30	30	36	36
YSRW	A	⩽≦	–	15	17	19	27	27	32
	M_b1	[Nm]	–	5	8	20	35	35	55
	B	⩽≦	–	11	13	15	20	20	24
	C	⩽≦	–				4	–
	M_b2	[Nm]	–				10	–
	a	[mm]	–	34.10	37.1.10	48.1.10	56.5.10	58.5.10	74.10
	I	[mm]	–	4.9.10	5.2.10	4.7.10	3.2.10	10.4.10	11.2.10