BOSCH GAM 220 Digital Angle Measuring Device Instructions

: October 30, 2023
: Bosch

Table of Contents

Safety instructions
Product Description and Specifications
Technical Data
Assembly
Operation
Maintenance and Service
Disposal
CUSTOMER SUPPORT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

BOSCH GAM 220 Digital Angle Measuring Device Instructions

Safety instructions

Safety Symbol | All instructions must be read and observed.
The safeguards integrated into the measuring tool may be compromised if the measuring tool is not used in accordance with these instructions.
STORE THESE INSTRUCTIONS IN A SAFE PLACE.
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Have the measuring tool serviced only by a qualified specialist using only original replacement parts.
This will ensure that the safety of the measuring tool is maintained.
Do not use the measuring tool in explosive atmospheres which contain flammable liquids, gases or dust.
Sparks may be produced inside the measuring tool, which can ignite dust or fumes.
When sawing workpieces for which you have determined the angle using this measuring tool, always strictly follow the safety instructions and working advice for the saws in use (including instructions on positioning and clamping the workpiece).
When the required angles cannot be set on a certain saw or saw type, alternative sawing methods will need to be applied.
Extremely acute (sharp) angles can be cut using a taper jig with a table saw or a circular saw.

Product Description and Specifications

Please observe the illustrations at the beginning of this operating manual.

GAM 220
The measuring tool is intended for measuring and transferring angles (horizontal and vertical), e.g. for customizations in interior finishing work, in staircase construction or on exterior paneling.
The measuring tool is suitable for indoor and outdoor use.

GAM 220 MF
The measuring tool is intended for measuring and transferring angles and for calculating simple and compound mitre/bevel angles.
The measuring tool is suitable for indoor and outdoor use.

Product Features
The numbering of the product features shown refers to the illustration of the measuring tool on the graphic page.

Fold-out leg
Viewing window for display
Locking wheel
Base leg
Battery compartment cover
Battery compartment cover locking mechanism
Display
Level for horizontal alignment
Level for vertical alignment
Serial number
Button Hold
On/off button
Button for rotating the display
Button MTR1 for simple mitre (GAM 220 MF)
Button MTR2 for compound mitre (GAM 220 MF)
Leg extension (GAM 220 MF)
Protective bag

Display Elements

(a) Indicator H for saved value Hold
(b) Battery indicator
(c) Measured value
(d) Bevel angle indicator BVL (GAM 220 MF)
(e) Mitre angle indicator MTR (GAM 220 MF)
(f) Corner angle indicator CNR (GAM 220 MF)
(g) Spring angle indicator SPR (GAM 220 MF)

Technical Data

Digital angle measuring device	GAM 220	GAM 220 MF
Article number	3 601 K76 5..	3 601 K76 6..
Hold function	●	●
Display illumination	●	●
“Simple mitre” operating mode	–	●
“Compound mitre” operating mode	–	●
Measuring range	0–220°	0–220°
Measuring accuracy of angles	±0.1°	±0.1°
Smallest display unit	0.1°	0.1°
Operating temperature	–10 °C to +50 °C	–10 °C to +50 °C
Storage temperature	–20 °C to +70 °C	–20 °C to +70 °C
Max. altitude	2000 m	2000 m
Relative air humidity max.	90%	90%
Pollution degree according to IEC 61010-1	2A)	2A)
Batteries	4 × 1.5 V LR6 (AA)	4 × 1.5 V LR6 (AA)
Rechargeable batteries	4 × 1.2 V HR6 (AA)	4 × 1.2 V HR6 (AA)
Operating lifetime (alkali- manganese batteries) ap- prox.	80 h	80 h
Automatic switch-off after approx.	30 min	30 min
Leg length	400 mm	400 mm
Weight according to EPTA- Procedure 01:2014	1.3 kg	1.2 kg
Dimensions (length × width × height)	447 × 52 × 60 mm	447 × 52 × 60 mm
IP 54 (dust and splash-proof)	●	●

A) Only non-conductive deposits occur, whereby occasional temporary conductivity caused by condensation is expected.
The serial number (10) on the type plate is used to clearly identify your measuring tool.

Assembly

Inserting/Replacing Batteries (see figure A)
It is recommended that you use alkaline manganese batteries to operate the measuring tool.
To open the battery compartment cover (5), press the locking mechanism (6) and fold the battery compartment cover up.
Insert the batteries/rechargeable batteries.
When doing so, ensure that the polarity is correct and corresponds to the diagram on the battery compartment cover.
Assembly Instruction

Battery Indicator
The battery indicator (b) always indicates the current battery status:

Indicator	Capacity
90–100 %
60–90 %
30–60 %
10–30 %
0–10 % The empty battery indicator flashes. You can measure for

approximately another 15–20 min from when the flashing begins until the tool shuts down.

Always replace all the batteries at the same time.
Only use batteries from the same manufacturer and which have the same capacity.

Take the batteries out of the measuring tool when you are not using it for a prolonged period of time.
The batteries can corrode and self-discharge during prolonged storage in the measuring tool.

Mounting the Leg Extension

Slide the leg extension (16) from the front onto the fold-out leg (1).
Slide the leg extension as far as possible over the joint of the measuring tool.
Operation Instruction

Operation

Starting Operation

Protect the measuring tool from moisture and direct sunlight.
Do not expose the measuring tool to any extreme temperatures or variations in temperature.
For example, do not leave it in a car for extended periods of time.
In case of large variations in temperature, allow the measuring tool to adjust to the ambient temperature before putting it into operation.
The precision of the measuring tool may be compromised if exposed to extreme temperatures or variations in temperature.
Keep the supporting surfaces and contact edges of the measuring tool clean.
Protect the measuring tool against shock and impact.
Dirt particles or deformations can lead to faulty measurements.

Switching On and Off
To switch on the measuring tool, press the on/off button (12).
If the indicator H (a) lights up, a value from the last measurement is still saved.
This value can be deleted by briefly pressing the on/off button (12).
To switch off the measuring tool, press the on/off button (12).
When no activity is performed on the measuring tool for approx. 30 min, the measuring tool automatically switches off to save the batteries.

Aligning with the Spirit Levels
The measuring tool can be aligned horizontally with spirit level (8) and vertically with spirit level (9).
The measuring tool can also be used as a carpenter’s spirit level for checking vertical and horizontal lines.
For this, place or hold the measuring tool against the surface subject to checking.

Rotating the Display
To make the displayed value easier to read, press the button (13) to rotate the display.

“Normal measuring” Operating Mode
After switching on, the measuring tool is always in “normal measuring” operating mode.
In “normal measuring” operating mode, angle measurement is carried out.

Measuring Angles (see figures C–D)
Place the fold-out leg (1) and the base leg (4) flat on the surfaces adjacent to the angle.
The displayed measured value (c) corresponds with the interior angle w between the base leg and the fold-out leg.
This measured value is shown on the display (7) until you change the angle between fold-out leg (1) and base leg (4).

Transferring Angles (see figure E)
Measure the angle to be transferred by placing the fold-out leg and base leg on the target angle.
The position of the legs can be locked mechanically by tightening the locking wheel (3).
The displayed value is not saved.
Place the measuring tool in the required position against the workpiece.
Use the legs as a straight edge to transfer the angle.
Operation Instruction

Storing the Measured Value
Press the Hold (11) button to store (H) the current measured value (c).
The indicator (a) flashes in the display for confirmation.
The currently displayed value is frozen and will not change even when the leg is moved.
If you press the memory button Hold again, the indicator (a) will be shown permanently on the display.
The displayed value will change depending on the leg movement.
The previously frozen value is now saved in the background.
If the memory button Hold (11) is pressed again, the previously saved value is displayed and the indicator (a) flashes.
To delete the contents of the memory, briefly press the on/off button (12).
To be able to save a new value, a previously saved value has to be deleted.
Saved values cannot be overwritten.
The held value is saved even when the measuring tool is switched off (manually or automatically).
However, it is deleted when changing batteries or when the batteries are empty.

Measuring with Leg Extension (see figures F–H)
The leg extension (16) makes it possible to measure angles when the contact surface is shorter than the fold-out leg (1).
Place the base leg (4) and the leg extension flat on the surfaces to be measured.
Operation Instruction

The measured value of the angle w between the base leg and fold-out leg is indicated in the display.
The required angle v between the base leg and leg extension is calculated as follows:
v = 180° – w

GAM 220 MF: “Simple Mitre” Operating Mode
The “Simple mitre” measurement is used to calculate the cutting angle MTR when two workpieces with the same mitre have to form any outer angle x° smaller than 180° (e.g. for skirting boards, banister columns or picture frames).
The “simple mitre” operating mode is activated by pressing the button MTR1 (14).
The displayed value is always used for the calculation of the MTR.
If a saved value is being displayed (indicator (a) flashes), the calculation will be performed with the saved value regardless of the position of the legs.
Operation Instruction

When workpieces are to be fitted into a corner (e.g. for skirting boards), measure the corner angle x° by positioning the fold-out leg and the base leg.
For given angles (e.g. picture frames), open the fold-out leg and the base leg until the required angle is indicated in the display.
Operation Instruction

The mitre angle MTR, by which the two workpieces are to be shortened, is calculated.
For these mitre/bevel cuts, the saw blade is perpendicular to the workpiece (the bevel angle is 0°).
Operation Instruction

Press the button MTR1 (14). The calculated horizontal mitre angle MTR, which has to be set on the chop and mitre saw, and the indicator MTR will be shown on the display.

Press the button MTR1 (14) to return from the “simple mitre” operating mode to the “standard measurement” operating mode.
Briefly pressing the on/off button (12) will also take you back to the “standard measurement” operating mode.
However, any saved Hold value will be deleted when doing so.

Note: The calculated miter angle MTR can only be transferred for miter saws, for which the setting for vertical cuts is 0°.
When the setting for vertical cuts is 90°, the angle for the saw must be calculated as follows: 90° – displayed angle MTR = angle to be set for the saw.

GAM 220 MF: “Compound Mitre” Operating Mode

The “Compound mitre” (“Compound MTR”) measurement is used to calculate mitre and bevel angles when two workpieces with multiple angles (e.g. crown mouldings) have to join precisely.
The “compound mitre” operating mode is activated by pressing the button MTR2 (15).
The displayed value of the leg positions is always used for the calculation of the angles.
Any saved Hold value will be deleted when the “compound mitre” operating mode is ended.
Carry out the work steps exactly in the given sequence.

SPR: Storing the spring angle

The spring angle can be saved as follows:
Open the fold-out leg and base leg until the required spring angle is shown on the display.
Measure the spring angle if it is unknown. For this, place the workpiece to be measured between the fold-out leg and the base leg.
When measuring particularly narrow or small workpieces with the measuring tool is not possible, use auxiliary equipment such as a bevel angle or mitre rule, and then adjust the angle on the measuring tool.
Press the MTR2 (15) button to store the measured spring angle for the compound mitre.
SPR and the current angle will appear on the display.
When the angle is greater than 90° yet less than 180° when pressing the button MTR2 (15) , the slope angle SPR is automatically converted as follows:
SPR = 180° – measured or set angle.
CNR: Storing the corner angle

To measure the corner angle, place the fold-out and base legs flat against the walls or set a known corner angle on the measuring tool.
Press the MTR2 (15) button again to store the measured corner angle for the compound mitre.
CNR and the current angle will appear on the display.
MTR: Calculating the mitre angle

Press the MTR2 (15) button again.
MTR and the calculated mitre angle for the mitre saw are indicated on the display.
The mitre angle is used to define the rotation of the saw table (MTR).
BVL: Calculating the bevel angle

Press the MTR2 (15) button again.
BVL and the calculated bevel angle for the mitre saw are indicated on the display.
The bevel angle is used to define the incline of the saw blade (BVL).
If necessary, the mitre and bevel angle can be retrieved again, but only if the on/off button (12) has not been pressed to change the operating mode.
Press the button MTR2 (15) to retrieve the angle.
In the display, MTR and the calculated mitre angle appear; upon pressing the button MTR2 (15) again, BVL and the bevel angle appear.
Press the button MTR1 (14) for less than one second to switch back from the “compound mitre” operating mode to the “standard measurement” operating mode.

Notes on “Compound Mitre” Operating Mode
The calculated mitre angle MTR can only be transferred for mitre saws, for which the setting for vertical cuts is 0°.
When the setting for vertical cuts is 90°, the angle for the saw must be calculated as follows:
90° – displayed angle MTR = angle to be set for the saw.

Maintenance and Service

Maintenance and Cleaning
Keep the measuring tool clean at all times.
Never immerse the measuring tool in water or other liquids.
Wipe off any dirt using a damp, soft cloth.
Do not use any detergents or solvents.
When the measuring tool is exposed to rain for an extended period, its function may be impaired.
However, after completely drying off, the measuring tool is ready for operation.
No calibration is required.
Only store and transport the measuring tool in the protective bag (17).
If the measuring tool needs to be repaired, send it off in the protective bag (17).

After-Sales Service and Application Service
Our after-sales service responds to your questions concerning maintenance and repair of your product as well as spare parts.
You can find explosion drawings and information on spare parts at: www.bosch- pt.com
The Bosch product use advice team will be happy to help you with any questions about our products and their accessories.
In all correspondence and spare parts orders, please always include the 10‑digit article number given on the nameplate of the product.

Disposal

Measuring tools, battery packs/batteries, accessories and packaging should be sorted for environmentally friendly recycling.

| Do not dispose of the measuring tools or rechargeable/non-rechargeable batteries with household waste.
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Only for EU countries:
According to the Directive 2012/19/EU, measuring tools that are no longer usable, and according to the Directive 2006/66/EC, defective or used battery packs/batteries, must be collected separately and disposed of in an environmentally correct manner.

CUSTOMER SUPPORT

People’s Republic of China China Mainland
Bosch Power Tool (China) Co. Ltd.
Bosch Service Center
567, Bin Kang Road
Bin Kang District
Hangzhou, Zhejiang Province
China 310052
Tel.: (0571) 8887 5566 / 5588
Fax: (0571) 8887 6688 x 5566# / 5588#
E-Mail: bsc.hz@cn.bosch.com
www.bosch-pt.com.cn