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General Safety Instructions: 
 

Operating  a  bench  top  grinder  can  be 
dangerous  if  safety  precautions  and  common 
sense  are  not  followed.  The  operator  of  the 
machine 

should 

be 

familiar 

with 

and 

understand the manual before operation of the 
tool.  Do  not  operate  this  bench  top  grinder  if 
you  have  not  read  the  manual  and  are 
understanding  of  the  limitations  of  this 
machine. DO NOT modify this machine in any 
way. 
 

Before Operation of Grinder: 
 

WARNING!!! 

In order to avoid any potential serious injury 
or property damage, read and follow the 
safety and operating instructions laid out in 
this manual. 

 

1.) Some debris and dust generated by use of 
this  bench  top  grinder  may  contain  chemicals 
like:  
 

  Lead from lead-based paint 

  From Crystalline silica from bricks, 

cement, and other masonry 
products. 

  Arsenic and chromium from 

chemically treated lumber 
 
 

Your  risk  of  exposure  to  the  above  listed 
chemicals  varies  based  on  the  type  of  work 
being  performed.  Always  work  in  a  well 
ventilated  area  and  with  the  proper  approved 
safety equipment. Use of a dust mask capable 
of  filtering  out  microscopic  particulates  should 
be worn during operation of the bench grinder. 
 
 
 
 

2.) Read  through  the  owner’s  manual 
thoroughly  and  understand  how  to  use  this 
machine for its intended applications. 

 

3.) Ground  all  machines.  If  the  machine  has 
a  3  prong  plug,  it  must  be  used  in 
conjunction  with  a  3  prong  electrical 
receptacle. The purpose of the third prong is 
to  provide  grounding  for  the  machine  and  to 
prevent accidental electrical shock. DO NOT 
under  any  circumstance  remove  the  third 
prong. 
 
4.) Avoid 

possible 

hazardous 

working 

environments.  Avoid  using  any  electrical 
tools or machines and wet or damp locations. 
Do not expose to rain. 
 
5.) DO not use electrical machines or tools in 
the  presences  of  flammable  gasses  or 
liquids. 
 
6.) Always keep the work are clutter free and 
clean. Work area should be free from debris, 
slippery floors, grease, and wax. 
 
7.) Keep  children  away  during  operation  of 
the  machine  and  keep  everyone  out  of  your 
immediate work area. 
 
8.) Do not use the machine for purposes that 
are  not  intended  for  which  the  machine  was 
designed. 
 
9.) Do  not  wear  loose  fitting  clothing,  neck 
ties, gloves, or jewelry. These items increase 
the  risk  of  serious  injury  as  they  may  be 
caught  by  the  machine  during  operation  and 
pull  the  operator  in  towards  the  machines 
moving  parts.  Long  hair  should  also  be 
covered  and  kept  away

 

from  the  machine 

during  operation  to  avoid  getting  caught  as 
well.

 

 

Summary of Contents for CX904

Page 1: ...MODEL CX904 3 Mini Grinder with Rotary Shaft Version 1 ...

Page 2: ... 7 Unpacking Your CX904 8 Specifications 9 Control Components 10 Inventory 11 Assembly 12 Adjusting Spark Deflector 13 Operation 14 Wheel Dressing 15 Installing Removing Grinding Wheel 16 Buffing 17 Types of Buffing Compounds 18 Using the Buffing Wheel 19 Maintenance 20 Trouble Shooting 22 Parts 24 Parts List 25 Wiring Diagram 27 Warranty 28 ...

Page 3: ...n of the bench grinder 2 Read through the owner s manual thoroughly and understand how to use this machine for its intended applications 3 Ground all machines If the machine has a 3 prong plug it must be used in conjunction with a 3 prong electrical receptacle The purpose of the third prong is to provide grounding for the machine and to prevent accidental electrical shock DO NOT under any circumst...

Page 4: ...ys keep machine clean and in proper working order Dress the grinding wheels and replace other abrasive accessories when worn out 21 Before operating machine check for any damaged parts or accessories Thoroughly check all safety guards are operating as they should and are not damaged Also check for the alignment binding breaking of moving parts 22 Do not operate machine under the influence of drugs...

Page 5: ...y to warm up reducing the chances of wheel damage Do not grind on the sides of the grinding wheels or use coolant or cutting liquids directly on the surface of the grinding wheel 7 The Grinding wheel should be dressed often to keep the wheel surface flat and free of contaminates like residue or glaze 8 Tool rest should be kept securely in place and used to position your work piece for grinding 9 D...

Page 6: ...avoid these issues insure you are connected to a circuit in which meets the specified circuit requirements for this piece of machinery WARNING Do not connect machine to power before setup has been fully completed to avoid risk of personal injury or property damage CIRCUIT REQUIREMENTS FOR CX904 3 MINI GRINDER BUFFER The CX904 has been prewired at the factory for operation on an electrical circuit ...

Page 7: ...sed electrician NOTE If ever you notice damage or ware to either the cord or plug disconnect it immediately from the power supply and have it replaced by a licensed electrician or service tech before any further use of the machine USE WITH EXTENSION CORDS If you absolutely must require the use of an extension cord with your machine do so on a temporary short term basis only NOTE We recommend that ...

Page 8: ...u may need to repeat this step a couple times to remove all protective coating NOTE Do not use gasoline acetone or paint thinner to remove protective coating as they may damage the painted areas 3 Compare all the items from the carton with Figure 1 Make sure all items in the inventory are accounted for before throwing away carton and packaging materials WARNING If any parts of the machine appear t...

Page 9: ...A Minimum Circuit Size 15A Connection Type Cord Plug Power Cord Included Yes Power Cord Length 6 1 2 ft Plug Included Yes Plug Type 5 15 Switch Type Toggle ON OFF Switch Motors Main Type Induction Horsepower 1 14 HP Phase Single Phase Amps 0 4A Speed 3450 RPM Power Transfer Direct Drive Bearings Shielded Permanently Lubricated Main Specifications Operation Info Right Wheel Type Aluminum Oxide Left...

Page 10: ...erator during grinding operations C Tool Rest Flat surface for resting the workpiece during operation D ON OFF Switch Turns the motor on when pushed to the right and off when pushed to the left E Wheel Guard Protects the operator from accidental contact with the grinding wheel and helps to contain sparks while performing any grinding operations F Rotating Shaft Rotary tool attachment that connects...

Page 11: ...eft 1 F Tool Rest Right 1 G Pin Wrench 1 H Open End Wrench 10mmx7mm 1 I Collet Wrench 1 J Wing Bolts M4 0 7 3 K Phillips Head Screw M4 07x40 2 L Flange Nut M4 0 7 1 M Flat Washers 3 N Phillips Head Screw M4 0 7x8 2 MOUNTING The grinder features four pre drilled holes on its base which allow mounting it to the workbench There are two ways to mount the grinder onto the workbench through mount and di...

Page 12: ...6 below Figure 6 3 Connect each tool rest to the grinder using 2 4mm flat washers and 2 M4 7 x 10 wing bolts as seen in figure 7 below Figure 7 Adjusting Tool Rests The tool rest supports the workpiece when grinding hence it is important to adjust the tool rest correctly The tool rest should be positioned at 1 16 1 8 from the grinding wheel As the grinding wheel wears and the gap between the grind...

Page 13: ...assembled the grinder and verified that grinding wheel is secured it is then time to do a test run and see that the machine powers up and runs properly To rest run the grinder Remove and clear away all the tools and objects used for assembling the machine Make sure you have read and understood the instructions given in this user manual and your grinder is set up properly Connect the cord to the po...

Page 14: ...l may crack or become damaged more easily and grinding of the other objects will be difficult If the workpiece becomes hot dip it into the water or oil to cool it preventing surface hardening or temper loss If the surface of the grinding wheel is no longer square the wheel should be reshaped using a wheel dressing tool or replaced GRINDING WHEEL INSPECTION The CX904 comes with an aluminum oxide gr...

Page 15: ... the possibility of breaking apart during operation and injuring the operator or others in the area Tips to Help Avoid Breaking a Wheel Always store and transport the wheels with care Wheels can become damaged if dropped or if heavy objects are place on top of them Only use wheels that are compatible and are rated for the RPM of your grinder Use the proper grinding wheel for the application Do not...

Page 16: ...ove M6 1 hex nut See Figure 12 below Figure 12 5 Remove outer wheel flange along with the paper disc Note hold grinding wheel with free hand to stop the spindle from turning while removing the hex nut 6 Now remove the grinding wheel and bushing from the spindle Pay attention to the fiber or paper disc between the wheel flange and wheel The paper disc is there to cushion the pressure of the wheel f...

Page 17: ...ot to use too much compound Place your workpiece under the wheel when you are applying the compound on to the buffing wheel By doing this should any of the compound drop it will land on the workpiece and won t be wasted on the floor To start buffing you will need to place your workpiece on to the tool rest and slowly start moving it towards the buffing wheel You must always hold the workpiece firm...

Page 18: ... with sisal and airway hard buffing wheels The black compound is perfect for the initial rough cut on stainless steel and iron Tripoli This is a middle of the road abrasive that provides a great medium cut for aluminum brass or zinc alloy Installing Removing Buffing Wheels The CX904 has a left and right shaft to allow for the option of mounting grinding or buffing accessories dependent on the appl...

Page 19: ...s disconnected from its power supply 2 Remove cover and screw or thread rotating shaft onto spindle located on the right hand side of the grinder See figure 15 Figure 15 NOTE Hold the wrench on flats of the rotating shaft then rotate the grinding wheel counter clockwise with spare hand to tighten Installing Bits in Rotary Shaft CX904 s rotary shaft uses cutter and bits with a 1 8 shaft diameter Ho...

Page 20: ...ose or severely worn buffing wheel Check chord for any wear or damage Grinding Wheels Grinding wheels must be inspected before each use You can use a method called the ring test that was mentioned in the wheel inspection section of this manual When storing grinding wheels you have to mindful to keep them from potential damages by being dropped or having other items stacked on top of them Grinding ...

Page 21: ...or heat Buffing Wheels Buffing wheels must be raked out before each use and when buildup becomes heavy during operation Raking is cleaning the buffing wheels with a wheel rake to remove any build up of compounds or metal debris When using a wheel rake always use light pressure ...

Page 22: ... Motor is overheating 3 Bearings for motor are at fault 4 Run capacitor is at fault 5 Motor has been wired incorrectly 1 Try new grinding or buffing wheel and slow your feed rate 2 Let motor cool down Clean motor and reduce the workload 3 Test bearings Repair or replace 4 Test capacitor Repair or replace 5 Re wire motor correctly Machine is noisy or vibrates during operation 1 Component or motor i...

Page 23: ...ot being held firmly 2 Wheel surface has an impurity 1 Utilize a holding device to securely retain workpiece 2 Grinding wheel requires dressing Workpiece has burnt spots or cracks 1 Using the wrong type of grinding wheel for the application 2 Workpiece Material requires quenching 3 Improper feed rate 1 Use a grinding wheel that is a softer style or coarser grit 2 Use water to quench and cool down ...

Page 24: ...24 Parts ...

Page 25: ...L GUARD RIGHT 12 PCX90412 INNER WHEEL GUARD RIGHT 13 PCX90413 SCREW PH HD M4 0 7 X 10 W WASHER 14 PCX90414 SCREW PH HD M4 0 7 X 40 15 PCX90415 WASHER FLAT M4 16 PCX90416 SPARK DEFLECTOR 17 PCX90417 TOOL REST RIGHT 18 PCX90418 SAFETY SHIELD 19 PCX90419 NUT HEX FLANGE M4 0 7 20 PCX90420 SWITCH ON OFF KEDU HY35C 21 PCX90421 STATOR 22 PCX90422 EXT RETAINING RING 10MM 23 PCX90423 ROTOR 24 PCX90424 WASH...

Page 26: ...CREW PH HD M4 0 7 X 10 W WASHER 35 PCX90435 GRINDER BASE COVER 36 PCX90436 RUBBER FOOT 37 PCX90437 SCREW PH HD M4 0 7 X 6 W WASHER 38 PCX90438 GROMMET 6MM 39 PCX90439 ROTATING SHAFT COVER 40 PCX90440 ROTATING SHAFT 42 PCX90442 SCREW PH HD M4 0 7 X 12 W WASHER 43 PCX90443 PIN WRENCH 3MM 44 PCX90444 COLLET WRENCH 45 PCX90445 WRENCH 10MM X 7MM OPEN END ...

Page 27: ...27 ...

Page 28: ...usive to Busy Bee Tools For replacement parts directly from Busy Bee Tools for this machine please call 1 800 461 BUSY 2879 and have your credit card and part number handy You can find the part number in the back of your owner s manual under the parts list exploded diagram All returned merchandise will be subject to a minimum charge of 15 for re stocking and handling A Machinery Return Form must b...

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