Table of Contents | Bosch Power Tools 3912 instruction

Safety

!WARNING “READ ALL INSTRUCTIONS” — Failure to follow the SAFETY RULES identified by BULLET (l) symbol listed BELOW and other safety precautions, may result in serious personal injury.

Double Insulated Tools

Double insulation is a design concept used in electric power tools which eliminates the need for the three wire grounded power cord and grounded power supply system. It is a recognized and approved system by Underwriter’s Laboratories, CSA and Federal OSHA authorities.

•Servicing of a tool with double insulation requires care and knowledge of the system and should be performed only by a qualified service technician.

•WHEN SERVICING, USE ONLY IDENTICAL REPLACEMENT PARTS.

•POLARIZED PLUGS. If your tool is equipped with a polarized plug (one blade is wider than the other), this plug will fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install the proper outlet. Do not change the plug in any way.

“SAVE THESE INSTRUCTIONS”

Extension Cords

•Replace damaged cords immediately. Use of damaged cords can shock, burn or electrocute.

•If an extension cord is necessary, a cord with adequate size conductors should be used to prevent excessive voltage drop, loss of power or overheating. The table shows the correct size to use, depending on cord length and nameplate amperage rating of tool. If in doubt, use the next heavier gauge. Always use U.L. and CSA listed extension cords.

RECOMMENDED SIZES OF EXTENSION CORDS

Tool’s		120 Volt A.C. Tools
Ampere		Cord Length in Feet
Rating		Cord Size in A.W.G.

	25	50	100	150

3-6	18	16	16	14
6-8	18	16	14	12
8-10	18	16	14	12
10-12	16	16	14	12
12-16	14	12	–	–

NOTE: The smaller the gauge number, the heavier the cord.

	Page		Page
Safety	2-6	Installation	44, 46
General Safety Rules for Benchtop Tools	2-3	Mounting Applications	46
Safety Rules for Miter Saws	3-6	Basic Saw Operations	48-54
Table of Contents	6	Body and Hand Position	48
Electrical Requirements	7	Workpiece Support	50, 52
Getting to Know your Miter Saw	8-9	Switch Activation	52
Assembly	26-32	Detent Override	54
Tools needed for Assembly and Alignment	26	Sliding Base/Fence Extension	54
Unpacking and Checking Contents	28	Saw Operations	56-72
Installation of Miter Lock Knob	28	Miter Cut	56
Installation and removal of the Blade	30	Bevel Cut	58
Assembling Dust Elbow and Dust Bag	32	Compound Cuts	60
Adjustments	34-44	Base Molding	62
Blade square to Table (90°)	34	Cutting Crown Molding	65
Blade 45° to Table	36	Special Cuts	72
Blade Square to Fence	38	Accessories	74
Miter Scale and Vernier Scale Usage	40	Maintenance and Lubrication	76, 78
Miter Scale (Vernier) Indicator Adjustment	42	Trouble Shooting	80, 82
Crown Molding Detent Adjustment (Bevel)	42