Instruction/ maintenance manual of the product CM/200/1 Cobra Electronics
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TM Cobra Magnetic Drilling Machine Models CM/200/1 & CM/200/3 OPERATOR’S MANUAL Rotabroach, Imperial works, Sheffield Road, Tinsley, Sheffield S9 2YL. England. Tel: (++44) 0114 221 2500 Fax: (++44) 0114 221 2560 Email: info @rotabraoch.co.uk Web: www.
RLL233 Issue 4 Aug 2007 1 CONTENTS OF THE MANUAL. Page [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] Specification of machine. General procedures and safety measures. Operating instructions. Extension cable selection. Mounting of cutters.
RLL233 Issue 4 Aug 2007 2 [1] ROTABROACH MAGNETIC DRILLING MACHINE MODELS CM/200/1/ & CM/200/3 Maximum hole cutting capacity in .2/.3C steel = 65mm dia. x 50mm deep Arbor bore = 19.05mm (3/4") dia. Motor Unit Voltages 110v 230v normal full load 14 A 1400 W 6 A 1400 W Electro Magnet 0.
RLL233 Issue 4 Aug 2007 3 READ BEFORE USING THE MACHINE [2] SAFETY PROCEDURES • When using electrical tools, basic safety precautions should always be followed to reduce the risk of electric shock, fire, and personal injury. • Do NOT use in wet or damp conditions.
RLL233 Issue 4 Aug 2007 4 • On completion of the cut, a slug will be ejected. DO NOT operate the machine if the ejected slug may cause injury. [3] OPERATING INSTRUCTIONS • Keep the inside of the cutter clear of swarf. It restricts the operating depth of the cutter.
RLL233 Issue 4 Aug 2007 5 SPEED SELECTION The machine is equipped with two speed ranges, High, and Low, and a stepless variation of each range. The speed range is changed by the rotary change switch located on the gearbox side. Do not change gear while the motor is in motion.
RLL233 Issue 4 Aug 2007 6 [6] CUTTERS AND PILOTS Diameter. Pilot type. 12 RA3057 13 -18 RA359 19 - 52 RA3047 12 RA3013 13 -17 RA3030 18 - 65 RA356 18 - 36 RA3047 12 SRA3057 13 - 52 SRA25 12 SRA3013 13 - 65 SRA50 18 - 36 SRA25 SCRWC SRC, SRCV SRCL, SRCVL CRWC RCL, RCVL Cutter & Pilot relationship.
RLL233 Issue 4 Aug 2007 7 [7] REMEDIES FOR HOLE MAKING PROBLEMS Problem Cause Remedy 1) Magnetic base won't hold effectively Material being cut may be too thin for efficient holding of magnet Swa.
RLL233 Issue 4 Aug 2007 8 Problem Cause Remedy 3) Excessive drilling pressure required Incorrectly re-sharpened, worn or chipped cutter Coming down on swarf lying on surface of work-piece Gibs out of adjustment or lack of lubrication Swarf accumulated (packed) inside cutter Incorrect speed selection.
RLL233 Issue 4 Aug 2007 9 [8] WIRING DIAGRAM.
RLL233 Issue 4 Aug 2007 [9] EXPLODED VIEW OF COMPLETE MACHINE.
RLL233 Issue 4 Aug 2007 Page 11 Item Component Part No. Item Component Part No. Item Component Part No. 1 Guard assembly RD25501 6.6 Internal washer RD4069 9.6 Chain bush RD4521 1.1 Guard RD35522 6.7 Washer RD4070 9.7 Countersunk set screw RD4018 1.2 Pan head screw RD4077 6.
RLL233 Issue 4 Aug 2007 Page 12 [10] EXPLODED VIEW OF GEARBOX AND MOTOR UNITS.
RLL233 Issue 4 Aug 2007 Page 13 Part list of motor & gearbox(Cobra) Item Component Part No. Item Component Part No. Item Component Part No. 1 Motor assembly (110v) RD25521 3.7 Speed controller assembly (110v) RD23330 7.7 Disk spring RD45506 1 Motor assembly (230v) RD25523 3.
RLL233 Issue 4 Aug 2007 Page 14 [11] PIPE ADAPTOR KIT RD2311 FITTING INSTRUCTIONS • Dependent upon the size of the pipe to be cut (see illustrations) attach adjustable angle plates RD3328 with cap screws RD4325 and washers RD4205 (4 off each) to the magnet sides.
RLL233 Issue 4 Aug 2007 15 [12] WIRING OF MAINS PLUG The wires of the mains lead are coloured in accordance with the following code: GREEN and YELLOW EARTH BLUE NEUTRAL BROWN LIVE As the colours of th.
RLL233 Issue 4 Aug 2007 16 13] CUTTING SPEEDS. Material Surface speed (M/min) Aluminium 60-90 Cast iron Soft 30-50 Hard alloy 15-21 Malleable 15-30 Steel Mild (460 N/mm_) 24-30 (460-770 N/mm_) 15-27 (.
RLL233 Issue 4 Aug 2007 17 Cutter diameter and speed relationship High gear. Low gear. Selector No RPM Cutter Dia. Selector No RPM Cutter Dia. 1 300 32 1 150 62 2 360 26 2 180 52 3 430 22 3 215 46 4 5.
RLL233 Issue 4 Aug 2007 18 [14] REPLACEMENT OF MOTOR SUPPLY CABLE. TO REMOVE OLD CABLE AND CHAIN Ensure that the machine is disconnected from any source of power. Failure to do so may result in personal injury. • Remove screws #73 and withdraw the control unit from the housing.
RLL233 Issue 4 Aug 2007 19 The replacement is a complete factory produced assembly, and RD272 (230v) is illustrated below. TO REMOVE OLD CABLE FROM MACHINE • The machine MUST be disconnected from any source of power supply before attempting to conduct any maintenance work.
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