VEVOR MR-20G Drill Bit Grinder Instruction Manual

VEVOR MR-20G Drill Bit Grinder

Product Information

The Drill Bit Grinder is a model MR-20G tool used for sharpening  drill bits. It is equipped with a Taiwan diamond grinding wheel,providing accurate angles and long service life. The grinder  features a powerful DC motor with stable frequency and strong horsepower. It operates on 220V, 50/60HZ power supply and has amotor speed of 4400rpm. The grinding range is between 3-20mm, and it weighs 11kg.

Product Usage Instructions

1. Before operating the Drill Bit Grinder, ensure that all switches turn off and on properly.
2. Setup the drill bit to the ER collet chuck:
   • Do not fully fasten the clamping nut with the collet chuck, allowing adjustment of the drill bit.
3. Align the drill bit:
   • Reset the scale ring by turning it clockwise and then anti-clockwise to match the drill size.
   • Insert the chuck set into the web adjustment shelf and connect it tightly.
   • Plug the drill and turn it clockwise until the end.
   • Turn the chuck set clockwise to the end and tighten it.
   • Slightly turn the chuck set anti-clockwise and gently remove it.
   • Ensure that the cutting lip of the drill is parallel to theslot of the clamping nut before starting the grinding job. Adjust if necessary.
4. Grind the point angle:
   • Turn on the power switch and wait for the motor rotation to stabilize (approximately 10 seconds).
   • Put the chuck set into the point angle grinding shelf, ensuring the slot of the clamping nut fits with the two pins of the grindingshelf.
   • Gently insert the drill into the grinding shelf until it reaches the grinding wheel.
   • Grind the drill by moving it left and right until the grinding sound disappears.
5. Point grinding and point splitting:
   • Put the chuck set into the point splitting shelf, ensuring the slot of the clamping nut fits with the pin of the grinding shelf.
   • Gently insert the drill into the grinding shelf until it reaches the grinding wheel.
   • Grind the drill by moving it left and right until the grinding sound disappears.
   • Turn back to the center of the pin, take out the drill, and repeat the process on the other side.
   • Note: The lip relief face is adjustable by taking out the pin and placing it in another hole.
6. Clean and maintenance:  
   • After use, clean the entire unit with an air blow gun, payingspecial attention to the holes.
7. Replacing the wheel:
   • Ensure that the power cord is unplugged before proceeding.
   • Use a 4mm hex wrench to loosen the screw and open the wheelcover.

OPERATING INSTRUCTION

PLEASE REMEMBER

1. When using electric tools, machines or equipment, basic safety precautions should always be followed to reduce the risk of fire, electric shock, and personalinjury.
2. Keep work area clean. Cluttered areas invite injuries
3. Consider work area conditions. Don’t use machines or power tools in damp, wet or poorly lit locations. Don’t expose equipment to rain, keep work area well lit. Don’t use tools in the presence of flammable gases or liquids.
4. Keep children away, all children should be kept away from the work area.
5. Guard against electric shock. Prevent bodily contact with grounded surfaces such as pipes, radiators, ranges, and refrigerator enclosures.
6. Stay alert. Never operate if you are tired.
7. Don’t operate the product if under the influence of alcohol or drugs. Read warning labels on prescriptions to determine if your judgment or reaction might be impaired.
8. Don’t wear loose clothing or jewelry as they can be caught in moving parts.
9. Wear restrictive hair covering to contain long hair. Use eye and ear protection.
10. Keep proper footing and balance at all times.
11. Don’t reach over or across running machines.

Before operating

1. Be sure the switch is OFF when not in use and before plugging in.
2. Don’t attempt to use inappropriate attachments in an attempt to exceed the tools capacity. Approved accessories are available from the dealer or machine maker.
3. Check for damaged parts, before using any tool, any part that appears damaged should be carefully checked to determine that it will operate properly and perform its intended function.
4. Check for alignment and binding of all moving parts, broken parts or mounting fixture and any other condition that may affect proper operation. Any part that is damaged should be entirely or replaced by a qualified technician.
5. Do not use the tool if any switch does not turn off and on properly.

MAIN APPLICATION AND CHARACTERISTICS

1. It can sharpen the drill bit front cutting lip ,lip relief angle and point angle,you also can control the center spot at random instead of center drill,escape of chips easily.drill with a light heart.
2. With Taiwan diamond grinding wheel, it can be equipped directly with an accurate angle and long service life.
3. The electrically controlled and powerful DC motor: stable frequency, strong horsepower and long service life.

Model| Grinding

Range

| Point

angle

| Power| Motor/

Speed

| Weight| Dimension
---|---|---|---|---|---|---
MR-20G| Ф3-ф20

mm

| 100°(95°)-

135°

| 220V,

50/60HZ

| 120W/

4400rpm

| 11KG| 34×18×20

cm

Standard Equipment

| Grinding wheel :CBN (for HSS)×1 piece
---|---
11 ER20 collets: ф3-ф13

7 ER25 collets: ф14-ф20

collet chuck (ER20) ×1piece

Collet chunck(ER25)×1piece

Electric wire: 1piece
2 pcs hexagon wrench (2.5, 4mm)
Optional Equipment| grinding wheel :SD (for Carbide)
ER20 collet: ф2.5, ф3.5 ф4.5 ф5.5

OPERATIONS

• A. Setup the drill bit to the ER collet chuck
• Please follow step 1,2 to set up the drill bit to the chuck (without tightening)

1. Determine diameter of your drill bit, and then select the proper collet and collet chuck.
2. Insert collet into collet chuck by 45°angle, and tighten nut slightly.
3. Insert drill bit into collet chuck and nuts out 35mm or so from the collet chuck, but do not tightened the drill too tight.
   • Do not fully fasten the clamping nut with collet chuck, keep the drill able to be adjusted.

Align drill bit

1. Reset the scale ring: turn the ring all the way clockwise, and then turn it anti-clockwise to the number same as the drill’s size.
2. Insert the chuck set into the web adjustment shelf. Then connect it tightly. Turn it clockwise to the end.
3. Plug the drill to the end and turn it clockwise to the end.
4. Turn the chuck set clockwise to the end and tightens it
5. Turn the chuck set a little to the anti-clockwise and taking it out gently.

• Make sure the cutting lip of drill is parallel with the slot of clamping nut before grinding job started. If it is not parallel, adjust it again.

Attention: If the cutting lip is downward, must increase the scale of web adjustment shelf. If it is upward, please decrease the scale of the web adjustment shelf.
When the flute length of a drill becomes shorter, the web thickness of a drill would become thicker. So, for the same diameter of drills, the shorter length of a drill, the higher scale of web adjustment shelf need to be increased..

• C. Grind the point angle

Turn the power switch on and wait until the motor rotation is stable (about 10 seconds), put the chuck set into the point angle grinding shelf.The slot of clamping nut must fit with the two pins of the grinding shelf. Insert the drill gently into grinding shelf until reach the grinding wheel.Grind the drill by moving left and right until the grinding sound disappears. And then turn to the other side, do the same to grind the drill.

• The grinding size of drill is 2mm-13mm(15mm）
• The point angle of drill is from 95°to 135°。
• While grinding, don’t hold the stem of drill, it will affect the accuracy.
• D. Point grinding point splitting

Put the chuck set into the point splitting shelf. The slot of clamping nut must fit with the pin of the grinding shelf. Insert the drill gently into grinding shelf until reach the grinding wheel.Grind the drill by moving left and right until the grinding sound disappears. Turn back to the center of pin and take out, then turn to the other side, do the same to grind the drill.
Notice: The lip relief face is adjustable by taking out the pin to the another holes.

CLEAN AND MAINTENANCE

Please clean the whole unit with an air blow gun, especially the holes before and after use

REPLACING THE WHEEL

• A. Open the wheel cover
• Make sure it is safe that the power cord is unplugged
• Then use the 4mm hex wrench to loose the screw to open the cover.
• B. Take out the grinding wheel

1. Use the brush to clean the machine, then use dry cloth to clean the surface.
2. If you just use the the machine, please wait 3 minutes after the grinding temperature is fall.
3. Use the left hand to hold the wheel, then use the 4mm hex wrench to loose the screw counterclockwise by right hand.
4. Take out the diamond grinding wheel on the machine.
5. Replace the new grinding wheel.
6. Put the wheel into the principal axis of motor, and tighten the screw and the wheel cover to complete.

Notice: motor principal axis is very precise, if wrong work may be leading to the damage, thus affecting grinding wheel position.

More machine………

Documents / Resources

| VEVOR MR-20G Drill Bit Grinder [pdf] Instruction Manual
MR-20G, MR-20G Drill Bit Grinder, Drill Bit Grinder, Bit Grinder, Grinder, Sharpener
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