APC Manual
1. Product description.
The Albrecht Precision Chuck (APC) is a high precision toolholder with clamping gear. Its
unique design provides a very high clamping force, run-out accuracy as well as a positive dampening feature for
machining (milling, drilling, reaming, tapping, heavy-duty cutting, finish milling, HSC operations). The APC uses a
special collet to clamp the cutting tool and is operated by a hex key on the periphery.
2. Warranty
period for APC-products is 12 months after delivery date ex works assuming intended use.
Wear parts are not a part of the warranty (worm, sealing elements).
3. Intended use.
Albrecht APC chucks are used for clamping of rotationally symmetrical tools with cylindrical shafts.
Applicable shaft types: DIN 1835 B and E and DIN 6535 HB, HE with shaft diameter tolerance of h6. This product
may only by used within the restrictions of its technical specifications (
see chapter 9
). Intended use also includes
observation with the conditions the manufacturer has specified for operation, installation and maintenance.
The clamping of tools and the insertion of the APC chuck into a machine spindle with a standardized interface
must only be done by technically trained personnel in accordance with the operation manual. The maximum tool
weight is to follow by the machine manual. For additional bores, threads or attachments which are not offered as
accessories by Albrecht, may be attached only with the written permission of Albrecht. For long, overhang or heavy
tools or extensions, the max. rpm should be reduced, allowances which are laser marked on the tool are to observe.
Failure to comply with the minimum insertion depth of tool there is a risk of fracture and loss of accuracy.
To avoid corrosion, please notice the mixing ration of the coolant according to the manufacturer.
4. Safety instructions.
CAUTION:
When used with rotation, protective covers must be provided
(According to EG-Maschinenrichtlinie 2006/42/EG point 1.4.2.2. B). Not doing so could result in serious injury.
CAUTION:
When changing tools it may result in serious injury because of sharp edges and contours (wear suitable gloves).
CAUTION:
lure to comply with the minimum insertion depth of tool there is a risk of fracture and loss of accuracy.
ATTENTION:
When untighten the tool, please be ensure to hold the tool tight that it does not fall down
and thereby the tool and workpiece damage.
ATTENTION:
The following tools have no safety-zone (not ISO conform).
Be sure to check for tool changer interference before using.
DIN 69871 SK40:
300 025Z 240 0
ANSI B5.50 CAT40: 300 014Z 540 0; 300 914Z 540 0; 300 020Z 540 0; 300 025Z 540 0; 300 520Z 540;
300 920Z 540
5. Inserting the collet.
Clean the inner taper of the APC (Recommending: APC taper wiper). Manually screw the clean
collet with the tool into the chuck until the collet connects with the taper. In order to achieve max. clamping forces
we recommend to degrease tool shank, inner and outer collet cone as well as the inner-cone of the APC.
6. Clamping. Put in the hex key as far
as possible. Use only the original
Albrecht hex key. Hex tool surface is to
be inspected about damages!
The
chucking procedure starts by engaging the
screw on the side of the APC and rotating
the hex key clockwise. Max. clamping
torque see product-marking. Use only
following Albrecht keys: Ref.no. 139 0010 900 0: torque key 88,5 in-lbs., Ref.no.139 0020 900 0: adaptable torque key,
Ref.no.139 0000 905 0: standard clamping key with scale (max. 88,5 in-lbs. For a clamping - match the two
arrowheads.
7. Releasing.
Open the APC by turning the hex key counter-clockwise.
Note: when opening the APC you must overcome two resistance points.
First, you will overcome the friction torque and then the collet is loosened.
Then open until the tool can be taken out, respectively the collet can be
unscrewed manually.
8. Adjust End-Stop.
A length stop screw is located in the collet and
can be adjusted with a hex key (size 5/32 hex). For operation from
the back through the APC chuck with taper shank a bolt with a through
hole is necessary (form AD). The range of the length adjustment: 11mm.
9. Technical Data
APC Typ
Clamping Diameter,
Ø-tol. h6
Ø mm / Ø inch
Min.
Clamping
depth
Max.
Clamping
depth
Watch movie about the handling:
APC14/
APC20
2 - 5
1/8“
-
3/16“
17
66
6
1/4“
22
40
7 - 10
5/16“
-
3/8“
30
50
11 - 15
7/16“
-
9/16“
38
50
APC20
16 - 20
5/8“
-
3/4“
38
48,5
APC25
12,7
1/2“
47
54,5
16-32
5/8“
-
1 1/4“
47
60
Max. r.p.m. see product-marking. Max. operation temperature: 10-110°C (max. 230°F); Max. coolant pressure: 100 bar (1450 lb/in²)
10. Balancing grade.
Each Albrecht APC is fine-balanced without collet and tool according to the laser marking
Higher balancing quality and rpm on request. The use of shanks with recesses influences the balancing grade and run-out
accuracy of the whole system.
11. Maintenance.
The Precision Chuck APC is maintenance free over his lifetime. Clean APC (especially the inner cone)
and collet including thread after usage with a solvent base cleaner. According to contamination the cleaning cycles have
to be adjusted. After cleaning, apply a thin coat of anticorrosive.
12. Repairs.
In order to guarantee the precision of the tool, any APC in need of repair has to be sent to the manufacturer
or to an authorized national agent only. We recommend checking the chuck and the collet for run-out deviations and
gripping torque periodic, especially after a tool break or crash.
Albrecht Präzision GmbH & Co. KG, Antoniusstr. 25, 73249 Wernau, Germany
Tel: +49 (0) 71 53-30 06-0, [email protected]m, www.albrecht-germany.com
