DGC-8 - Vérin pneumatique linéaire Festo - Free user manual and instructions

Product Type	Guided Cylinder (Linear Actuator)
Stroke Length	8 mm
Piston Diameter	8 mm
Maximum Operating Pressure	8 bar (116 psi)
Operating Temperature Range	-20 to 80 °C
Weight	Approx. 0.2 kg
Power Supply	Pneumatic (compressed air)
Main Functions	Linear motion with guidance, precise positioning
Maintenance	Regular cleaning of guide rails, lubrication as needed
Safety Precautions	Ensure correct mounting, use pressure regulator, avoid overloading
Spare Parts Available	Seals, pistons, guide rails
Reparability	Repairable by qualified technician; spare parts available
General Information	Part of Festo's modular pneumatic system

Frequently Asked Questions - DGC-8 Festo

How do I mount the Festo DGC-8?

Mount the DGC-8 using the threaded holes on the body. Ensure the mounting surface is flat and rigid. Refer to the mounting instructions in the manual for torque specifications.

What is the maximum stroke length of the DGC-8?

The stroke length is 8 mm. This is fixed; the model number DGC-8 indicates the stroke.

What type of compressed air is required?

Use clean, dry compressed air within the pressure range of 0.5 to 8 bar. Filtration to 40 µm is recommended to prevent contamination.

Can I use the DGC-8 for vertical applications?

Yes, but ensure the load does not exceed the specified limits. For vertical use, consider a holding brake to prevent drifting when pressure is off.

How do I lubricate the DGC-8?

The DGC-8 may require periodic lubrication of the guide rods. Use a light machine oil (e.g., Festo OFSW-P) sparingly. Over-lubrication can attract dust.

What is the maximum operating temperature?

The device can operate in temperatures from -20 to 80 °C. For higher temperatures, consult Festo for special seals.

How do I adjust the cushioning?

The DGC-8 does not have adjustable cushioning. It is a fixed cushion design suitable for moderate speeds.

What accessories are available for the DGC-8?

Common accessories include mounting brackets, sensors (for position detection), and flow control valves to adjust speed.

How do I replace seals on the DGC-8?

Disconnect air supply, disassemble the cylinder, and replace the seal kit. Use Festo seal kit DGC-8. Ensure proper orientation during reassembly.

Where can I find the manual for Festo DGC-8?

The manual is available for free download on notice-facile.com in PDF format. It includes detailed installation, operation, and maintenance instructions.

USER MANUAL DGC-8 Festo

Technical line drawing of a linear motion guide rail with mounting brackets and central pivot block (no text or symbols)

FESTO
Festo SE & Co. KG

Ruiter Straße 82

73734 Esslingen

Germany

[phone]

www.festo.com

Operating instructions

Original instructions

8075213

2017-07h

[8075215]

Linear drive DGC-8 ... 63-... English

For all available product documentation → www.festo.com/pk

Note

Fitting and commissioning is to be carried out only by qualified personnel in accordance with the operating instructions.

1 Operating elements and connections

1 Thread for mounting the cylinder foot ^1) or for direct mounting

②Shock absorber or elastomer shock absorber (exchangeable → chapter “Commissioning”)

3 Guide rail

4Slide

5 Centring hole for effective load
6 Fastening thread for work load
7 Compressed air connections
8 Groove for proximity sensor 1)
9 Adjusting screw for end position cushioning

1) Accessories

Fig. 1

2 Function and application

When the compressed air is ports are pressurized alternately, the piston moves backwards and forwards in the tubing. By means of a rigid connection, the outer slide also moves. The slot in the cylinder barrel required for this is covered by a band system.

The DGC is intended for the space-saving transport of masses.

Both the slide mode and the yoke operating modes are permitted (observe loading limits).

Unpressurised movement of the slide is permitted only for fault elimination and at low speed. If the speed is too high, the resulting partial vacuum can pull the sealing band into the piston chamber. This leads to:

– severe leakage and
– impermissible accelerations (e.g. with a vertical mounting position).

Fig. 2 Circuit symbol

Fig. 3 Slide operation

Fig. 4 Yoke operation

3 Transport and storage

Note

- Avoid touching the guide rail with your hands during transport und storage. Otherwise the layer of grease will be damaged.

- Consider the weight of the DGC.

Depending on the design, the DGC weighs over 150 kg.

For transport, the transport belts must be spaced according to the permissible support distances (support distances Fig. 6).

4 Requirements for product use

Note

Malfunctions will occur if the device is not used correctly.

- Be sure to always comply with the specifications in this chapter.

- Note the warnings and instructions on the product and in the relevant operating instructions.

• Compare the maximum values specified in these operating instructions with your actual application (e.g. forces, torques, temperatures, masses).
  Only observance of the load limits allows operation of the product in compliance with the relevant safety regulations.
• Take into consideration the ambient conditions at the location of use.
  Corrosive elements in the environment (e.g. ozone) will reduce the service life of the product.
• Please comply with national and local safety laws and regulations.
• Use the product in its original state without any unauthorised modifications.
• Remove packaging, such as foils and cardboard.

Exception:

- The plastic cover on the aluminium guide rail (with DGC-...-G/GF).

The packing is intended for recycling (except for: oiled paper = general waste).

• Make sure that the compressed air is properly prepared 11 Technical Data
• Take the tolerance of the tightening torques into account. Unless otherwise specified, the tolerance is ± 20% .

5 Installation

5.1 Fitting mechanical components

• Avoid pushing in or sucking in the sealing band.
  Damage to the sealing band reduces its reliability in operation. Jerky movement of the unpressurised slide can cause a partial vacuum that sucks the sealing band into the piston chamber.
• Leave all screws and threaded bolts in their original states, unless you are requested to modify them in these instructions.
• Do not allow the band system to become damaged or excessively dirty. Damage to the DGC will reduce its reliability and service life.
• Make sure that the device is fitted free of mechanical stress and distortion.
• Use the foot mounting adapter HPC to mount the DGC on the end caps.
• Turn the mounting screws until they are equally tight.

Tightening torques [Nm]

HPC-8	HPC-12/18	HPC-25	HPC-32/40	HPC-50	HPC-63
0.8	1.6	2	4.5	15	23

Fig. 5

Drives with long stroke lengths:

- Use the support spacings (l) for the profile attachments MUC Fig. 6.

Fig. 6 This shows the support spacings required for the various fittings

Fitting profile fastenings type MUC:

1. Place the profile fastenings equally over the entire length of the drive, and not just over the stroke length.
2. Fasten the profile fastenings on the DGC → Fig. 7.

Mechanical assembly diagram showing a bracket with rotating components and a base plate (no text or symbols)

Fig. 7

1. Turn the clamping screws until they are equally tight.

Tightening torques [Nm]

MUC-8/12 MUC	C-18 MUC-25/32	MUC-40 MUC	50/63
1.2 4.1 8.3 14 20

Fig. 8

1. Make sure that the profile attachment does not collide with the slide or effective load (especially with lateral mounting). To do this, push the slide with the effective load over the complete travel distance.

With hard and stiff effective loads:

Note

If the slide becomes bent because of a buckled effective load, the service life of the guide will be reduced.

- Make sure that the mounting surface of the effective load has the following flatness (t): - G/GF: t ≤ 0.03 mm - KF/FA: t ≤ 0.01 mm

Fig. 10

- Note the tightening torques when fastening the work load on the slide:

Tightening torques [Nm]

DGC- 8/12 18 25/32 40 50/63
M4	G	2	-	-	-	-
	KF	2.5
M5		-	3.5 3.5 3.5 -
M6			-	6.5 6.5 6.5
M8				-	-	10

Fig. 11

Effective loads with own guide:

- Adjust the guides of the work load and of the DGC so that they are exactly parallel.

This is the only way to avoid overloading the slide 11 Technical Data: Perm. forces.

5.2 Fitting pneumatic components

Installation in a vertical or diagonal position:

Warning

If there is a power failure, the work mass will slide down. Danger of crushing!

• Check whether non-return valves HGL are necessary.
  In this way, you can prevent the work mass from sliding down suddenly.
• Check whether safety measures are necessary to prevent the mass from sinking down slowly as a result of leakage (e.g. toothed latches or moveable bolts).

- Select the supply ports.

In addition to the supply ports provided at the factory (W), there are also the alternative ports (A). These are fitted with plug screws.

W = Supply ports ex works

A = Alternative ports

5

With sizes 18 ... 63 the compressed air can be connected on one side (right).

L = end position left
R = end position right
l = movement to the left
r = movement to the right

Fig. 13

Setting the slide speed:

- Rotate the one-way flow control valves GRLA into the supply ports.

5.3 Installing the electric components

Position scanning with proximity sensors SME/SMT:

• Use grooves (S) from Fig. 16 to mount the proximity sensors.
• Observe the minimum distances between ferritic masses and the proximity sensors.

In this way you will avoid incorrect switching as a result of external influences.

Minimum clearances [mm]

	POS	8	12	18	25	32 ... 63
L1	1	0		0		0
	2	-		0		0
L2	1	20	10	10		0
	2	-		25		25
L3	1	30	25	25		25
	2	-		10	25	0
L4	1	0		0		0
	2	-		0		0

Fig. 14 (POS = position of proximity sensor)

• Place the proximity sensor on DGC-8/12 as follows:

Position	SME-10/SMT-10F-KL (-SL)	SME-10/SMT-10F-KQ (-SQ)
End position left (“L” → Fig. 12)	Cable exit to cylinder centre necessary	Fastening screw faces end cap
End position right (“R” → Fig. 12)	Fitting position, any	Fitting position, any

Fig. 15

In this way, you take into consideration the fact that the switching solenoid is arranged asymmetrically (left) on the internal slide.

In case of continuous signal:

- Check whether the proximity switch has been fitted the right way round.

Laying the cables for the proximity switches:

- Note that the cables for the proximity switches can be passed through the groove.

5.4 Installation of accessories

- Use the grooves as per Fig. 16 for fastening the accessories.

S = Groove for proximity switches (sensors)

N = Groove for mounting attachments

DGC-8 DGC-12 DGC-18 DGC-25

DGC-32 DGC-40 DGC-50 DGC-63

Fig. 16

- Use slot covers to avoid dirt in the sensor grooves (S) of the DGC-18 ... 63.

6 Commissioning

6.1 Commissioning the complete system

• Slowly pressurise the complete system. In this way you will prevent sudden uncontrolled movements.
  For slow start-up pressurisation, use on-off valve HEL.

6.2 Preparing for commissioning

With effective loads or at high and medium slide speeds:

• Use the configuration tool “DGC-QuickCalc” for pneumatic drives in the download area www.festo.com

- Use cushioning elements of sufficient size.

Without external cushioning devices the DGC will withstand maximum speeds and work loads as per catalogue specifications.

Warning

Without external cushioning devices the DGC may be damaged if the maximum values specified in the catalogue are exceeded.
- Even in the event of faults, the limit values must not be exceeded.

Before each commissioning and in operation:

Warning

Within the positioning range, make sure that

• nobody can reach into the path of the movable components (e.g. by providing a protective guard).
  – there are no objects in the positioning path.

It should not be possible to touch the DGC until the mass has come to a complete standstill.

Fig. 17

For DGC-...-G/GF:

- Remove the protective cover from the guide rail.

6.3 Carrying out commissioning

1. Close the one-way flow control valves

– for both sides at first completely,
– then open one rotation.

Using the internal end position cushioning PPV:

1. Close the adjusting screws for the internal end position cushioning PPV
   – first close completely,
   – then open one rotation.

2. Pressurise the DGC as follows:

– At first on both sides simultaneously. The slide will then move slightly to a centre of equilibrium.
- Then exhaust the DGC on one side. In this way you can avoid peak loadings on the DGC and in the compressed air network.

1. Start a test run.

Illustration of a mechanical device with a tool and circular components, labeled as Fig. 19 (no text or symbols on the device itself)

1. Check whether the speed of the slide must be modified.

Mass geometries with projection:

Warning

Danger of collision

- Note that the adjusting screws of the DGC may only be turned when the slide is at a stand.

1. Open up the one-way flow control valves slowly until the desired slide speed is reached.
2. Open the adjusting screws for the internal end position cushioning. The slide should reach the end position without striking hard against it or bouncing back.

Accurate adjustment of the stroke:

Warning

The DGC will be damaged if it is operated without the stop sleeve (H) and the locking nut (K).

- Fit the cushioning components together only with the stop sleeve (H) and the lock nut (K).

1. Loosen locking nut (K).
2. Screw the cushioning element in or out.

DGC-...(-GP) with elastomer shock absorber
DGC-...-YSR(W) with shock absorber

Fig. 21

Note

- For reasons of stability, distance d from Fig. 21 must not exceed the values in the following table:

Distance d [mm]

DGC-	8 12	18	25
G/GF/KF-P/PPV	11.3 ... 16.3	12.7 ... 17.7	13.8 15.8^1)	21.1 25.1^1)
GP-P/PPV	-	-	16.9 18.9^1)	23.6 27.6^1)
GF-YSR(W)	12.8 ... 22.8	14 ... 24	14.5 ... 24.5	22.5 ... 32.5
KF-YSR(W)	12.8 ... 22.8	14 ... 24	14.5 ... 24.5	22.5 ... 32.5

Distance d [mm]

DGC-	32	40	50	63
G/GF/KF-P/PPV	25.2 30.2^1)	28.7 33.7^1)	28.7 33.7^1)	38.8 43.8^1)
GP-P/PPV	25.2 30.2^1)	34.7 39.7^1)	–	–
GF-YSR(W)	27.3 37.3	31 41	31 56	41 76
KF-YSR(W)	27.3 52.3	31 56	31 56	41 76

1) Restriction: Additional masses and speed must be reduced.

Fig. 22

1. Tighten the locking nuts (K) with the following tightening torque.

Tightening torques [Nm]

DGC-	8/12	18	25	32	40	50	63
G-P/YSR(W) 2 -
GF-YSR(W)	-	3	5	8	20	35	60
KF-YSR(W)	2	5	20	20	35	35	60

Fig. 23

If the work load or dynamics are modified:

- Check whether other cushioning components are necessary.

7 Service and maintenance

Maintaining the band system:

• Clean the band system if required with a soft cloth.
• Avoid cleaning agents which will damage the band system which is made of PU. Excessive friction or the use of grease-solvent cleaning agents (e.g. soap suds) will damage the grease layer.
• Lubricate the surface of the band system if it no longer has a layer of grease. Grease type: LUB-KC1 (LUB-E1 for DGC-...-H1).

Lubricating the guides of types G and GF:

- Lubricate the guide rail if it no longer has a layer of grease, but at the latest: - every 3000km or every 3 years. Grease type: LUB-KC1 (for DGC-8-G/GF) - every 1000km or every 2 years. Grease type: LUB-E1 (for DGC-...G/GF-H1)

- Note that lubrication must be undertaken more often:

- if the environment is dusty and contaminated

– with work strokes of < 50 mm

- ambient temperatures >40^ .

The remaining sizes of types G/GF do not require any maintenance (relubrication however is permitted).

Lubricating the guide of type KF:

The lubrication intervals S_int depend on the load of the guide.

1. Calculate the load comparison factor f_v with the aid of the formula for combined loads ( Technical data) and determine the lubricating interval S_int from Fig. 24.

- Always lubricate the DGC at the latest every 3 years (every 2 years for the DGC-...-KF-...-H1).

- Note that lubrication must be undertaken more often:

- if the environment is dusty and contaminated

– with work strokes of < 50 mm or > 2000 mm

- at speeds of > 2 m/s

– in ambient temperatures of >40^ .

1. Lubricate the roller bearing through the holes on both sides of the slide. For this purpose use a grease gun with a pointed nozzle or alternatively a disposable syringe with needle.

Fig. 25

Permitted grease types:

DGC-8/12-KF: Gearmaster LXG 00 (Fuchs Lubritech GmbH)

DGC-18 ... 63-KF: Rhenus Norlith STM 2 (Rhenus Lub GmbH & Co. KG)

DGC-8 ... 63-KF-H1: ELKALUB VP 874 (Chemie-Technik)

- Push the slide backwards and forwards during lubrication.

Otherwise the grease cavities will not be filled to an equal extent.

Alternatively, Festo offers a service inspection which includes lubrication.

Otherwise the DGC does not require any maintenance.

8 Repair

- Recommendation: Return the product to our repair service for overhaul. This ensures that special attention will be paid to the necessary fine adjustments and inspections.

- Information on spare parts and aids can be found under: www.festo.com/spareparts

Replacing cushioning elements:

- Note the section “Accurate adjustment of the stroke” in the chapter “Commissioning”.

9 Accessories

Please select the appropriate accessories from our catalogue

→ www.festo.com/catalogue/DGC

10 Eliminating malfunctions

Malfunction Possible cause Remedy
Uneven movement of the slide	One-way flow control valve not fitted correctly	If possible reduce the exhaust (not the supply air)
	Guide rail not greased Lubricate guide rails in accordance with chapter “Care and maintenance”
Faults in position scanning	Ferritic parts in the vicinity of the proximity sensor	Use parts made of non-magnetic materials or observe minimum distances (→ 5.3. Installing the electric components)
Heavy leakage	Cylinder is distorted	Fasten the cylinder to a flat base.
	Seal worn Replace worn parts:	- Yourself with wearing parts kit- By returning to Festo for repairs
	Sealing band pressed in/ sucked in	When the linear drive is unpressurised, move the slide twice manually through the entire stroke (if necessary, push fixed stops into the end position)
		Avoid vacuum in the piston chamber (e.g. move the unpressurised slide slowly)
Cylinder does not reach the desired speed	Air volume not sufficient	- Select tubing with larger diameter- Switch volume upstream
	High friction or counteracting force	Observe maximum limits

11 Technical data

DGC-		8	12	18	25	32	40	50	63
Pneumatic connection	DGC	M5			G 1/8		G1/4		G3/8
	DGC-N	M5 suitable for 10-32 UNF			1/8 NPT		1/4 NPT		3/8 NPT
Mode of operation		Double-acting
Mounting position		Any
Operating medium		Compressed air in accordance with ISO8573-1:2010 [7:::-]
Operating pressure	[bar]	2.5 ... 8		2 ... 8			1.5 ... 8
Ambient temperature	[°C]	-10 ... +60
		+5 ... +60 (DGC-8-G)
Theoretical force at 6 bar	[N]	30	68	153	295	483	754	1178	1870
Speeds (min ... max)	[m/s]	0.15 ... 1	0.1 ... 1.2	0.05 ... 3		0.04 ... 3		0.03 ... 3	0.02 ... 3
Cushioning length PPV	[mm]	-		16.5	15.5	17.5	29.5	29.8	31.1
Cushioning	P	Flexible cushioning rings/pads at both ends		-
	PPV	-		Pneumatic cushioning, adjustable at both ends
	YSR	Shock absorber, hard characteristic curve
	YSRW	Shock absorber, progressive characteristic
Max. energy		→ For diagrams, see catalogue specifications
Note on materials	KF	Free of copper and PTFE
Materials		Scraper, band reverser, cover:				Polyacetal/polyamide
		Piston seal, cushioning seal, sealing band, cover band:				Polyurethane
		Stops:				Steel, corrosion resistant/coated
	G	End cap, cover, slide:				Aluminium, coated/polyamide
	GF	Slide:				Aluminium, anodised
	G/GF	Cylinder profile, guide rail:				Aluminium, anodised
	KF	Guide rail, slide:				Steel, corrosion resistant/coated

Fig. 27

Permitted force and torque loading

DGC-		8	12	18	25	32	40	50	63
G	Fymax [N]	150	300	70	180	250	370	480	650
	Fzmax	150	300	340	540	800	1100	1600	2000
	Mxmax [Nm]	0.5	1.3	1.9	4	9	12	20	26
	Mymax	2	5	12	20	40	60	150	150
	Mzmax	2	5	4	5	12	25	37	48
GF	Fymax [N]	-	-	440	640	900	1380	1500	2300
	Fzmax			540	1300 180	0 2000	2870 4460
	Mxmax [Nm]	-	-	3.4	8.5	15	28	54	96
	Mymax			20	40	70	110	270	450
	Mzmax			8.5	20	33	54	103	187
KF	Fymax [N]	300	650	1850	3050	3310	6890	6890	15200
	Fzmax	300	650	1850	3050	3310	6890	6890	15200
	Mxmax [Nm]	1.7	3.5	16	36	54	144	144	529
	Mymax	4.5	10	51	97	150	380	634	1157
	Mzmax	4.5	10	51	97	150	380	634	1157

Formula for combined loadings:

f_v = |Mx|Mx_max + |My|My_max + |Mz|Mz_max + |Fy|Fy_max + |Fz|Fz_max ≤ 1

Fig. 28