Dumore 57 Series Manuale utente

DUMORE CORPORATION

Quality is our legacy

1030 Veterans Street, Mauston, WI 53948-9314

Telephone 608-847-6420 FAX 1-800-338-6673

884-0263

REV. 11/2019

29696

Printed in USA

TOOL POST GRINDERS

MODEL 8587-210

MODEL 8584-210

MODEL 8588-210

MODEL 8479

SERIES 57

PARTS LIST

AND

OPERATING

INSTRUCTIONS

www.dumoretools.com

INTRODUCTION

Dumore tool post grinders have an international reputation for quality and dependability. Our Series 57 will turn a standard

lathe or other machine tool into a versatile, accurate, internal-external grinder. Cylindrical parts can be machined and then

finished ground in the same set-up. The Series 57 can be mounted on the compound of a lathe in a matter of minutes.

Features include nine spindle speeds and coil spring applying constant belt tension assuring proper alignment. A wide

range of spindles are available for toolroom, maintenance and production line needs.

POLICY STATEMENT

Dumore Corporation is committed to providing products that meet the ever expanding needs of our customers. It is our goal

to be the continuing leader in product quality, safety, and reliability.

TABLE OF CONTENTS

Introduction, Policy Statement Page 2

Safety Instructions Page 3 - 4

Specifications Page 5

Rules for Safe Grinding Page 6 - 7

Mounting Criteria Page 7

Safety Warnings Page 8

Set-Up Instructions Page 9 - 11

Face Grinding Page 12

Internal Grinding Page 12

Wheel Dressing Page 12

Selecting the Proper Wheel Page 12

Selecting the Proper Spindle Page 13 - 15

Grinding Wheel Listing Page 16 - 17

Pulley & Belt Combination Chart Page 18

Maintenance Instructions Page 18

Exploded View Page 19

Parts Listing Page 20 - 22

Mounted Wheel Chart Page 23

Warranty Page 24

Authorized Repair Centers Page 24

READ AND SAVE THESE INSTRUCTIONS!!

THE NEED FOR GROUNDING

In the event of a malfunction or breakdown, grounding provides

a path of least resistance for the electric current to reduce the

risk of electric shock. This tool is equipped with an electric cord

having an equipment grounding conductor and a grounding

plug. The plug must be plugged into a matching outlet that is

properly installed and grounded in accordance with all local

codes and ordinances.

s Note: Do not modify the plug provided - if it will not fit the

outlet, have the proper outlet installed by a qualified

electrician.

Improper connection of the equipment-grounding conductor

can result in a risk of electric shock. The conductor with

insulation having an outer surface that is green, with or without

yellow stripes, is the equipment - grounding conductor. If repair

or replacement of the electric cord or plug is necessary, do not

connect the equipment-grounding conductor to a live terminal.

Check with a qualified electrician or serviceman if the grounding

instructions are not completely understood, or if in doubt as to

whether the tool is properly grounded.

Repair or replace damaged or worn cord immediately.

Periodically check the ground circuit of the cord for continuity.

The use of a ground-fault protected receptacles is

recommended.

s WARNING: THIS TOOL SHOULD ONLY BE USED WHERE

POINT OF OPERATION GUARDING DEVICES HAVE BEEN

PROPERLY INSTALLED SO THAT IT IS IMPOSSIBLE FOR

THE OPERATOR’S HANDS OR FINGERS TO REMAIN

WITHIN THE POINT OF OPERATION DURING THE ACTUAL

MACHINE CYCLE.

s WARNING: Read all instructions. When using electric

tools, basic safety precautions should always be used to

reduce the risk of fire, electric shock, and personal injury,

including the following:

1. ALWAYS USE SAFETY GLASSES

(ANSI Z87.1 with side shields or an equivalent).

Polycarbonate lenses have been found to provide better

impact resistance than glass lenses

2. WEAR PROPER APPAREL

No loose clothing, gloves, neckties, rings, bracelets, or

other jewelry to get caught in moving parts. Non slip

footwear is recommended. Wear protective hair covering

to contain long hair.

3. DO NOT USE IN DANGEROUS ENVIRONMENT

Do not use power tools in damp or wet locations, or expose

them to rain. Keep work area well lighted. Do not use tool in

presence of flammable liquids or gases.

4. KEEP WORK AREA CLEAN

Cluttered areas and benches invite accidents.

5. DO NOT OVER-REACH

Keep proper footing and balance at all times.

6. REDUCE THE RISK OF UNINTENTIONAL

STARTING

Make sure switch is in off position before plugging.

7. CHECK DAMAGED PARTS

Check for alignment of moving parts, breakage of parts,

mounting, and any other conditions that affect its

operation. A part that is damaged should be properly

repaired or replaced by an authorized service center

unless otherwise indicated elsewhere in this instructional

manual. DO NOT USE TOOL IF SWITCH DOES NOT

TURN IT ON AND OFF. HAVE DEFECTIVE SWITCHES

REPLACED BY AUTHORIZED SERVICE CENTER.

8. DISCONNECT TOOLS

When not in use, before servicing and when changing

accessories, such as grinding wheels, etc.

9. REMOVE KEYS AND WRENCHES

Form habit of checking to see that keys and adjusting

wrenches are removed from tool before turning it on.

10. MAINTAIN TOOLS WITH CARE

Keep tools sharp and clean for best and safest

performance. Follow instructions for lubricating and

changing accessories. Inspect tool cords daily and if

damaged, have repaired by authorized service facility.

Inspect extension cords before use and replace if

damaged. Keep handles dry, clean, and free of oil and

grease.

s SAFETY INSTRUCTIONS

FUSE INTACT

HOT LINE

THIS SYSTEM IS DANGEROUS!

Don’t act as a conductor—Make

sure the tool is grounded through

the cord.

GROUNDING

BLADE COVER OF

GROUNDED

OUTLET BOX

GROUNDING MEANS

COVER OF

GROUNDED

OUTLET BOX

19. DO NOT ABUSE CORD

Never carry tool by cord or yank it to disconnect from

receptacle. Keep cord from heat, oil and sharp edges.

20. USE RECOMMENDED ACCESSORIES

Consult this manual or any Authorized Dumore Distributor

for recommended accessories. The use of improper

accessories may cause risk of injury to persons.

21. SET-UP

Do initial set-up and adjustment at an empty station. Keep

hands and clothing out of path of tool.

22. LOCKOUT / TAGOUT

Whenever maintenance work is being done on electrical

equipment, the Lockout/Tagout Procedure as required by

OSHA standard

23. SAVE THESE INSTRUCTIONS

s THIS SYMBOL IS USED THROUGH OUT THE

MANUAL TO HIGHLIGHT POTENTIAL DANGERS

11. SECURE WORK

Use clamps, a vise or fixture to hold work. It’s safer than

using your hand and it frees both hands to operate tool.

12. USE RIGHT TOOL

Do not use tools or attachments to do a job it was not

designed for.

13. DO NOT FORCE TOOL

` It will do the job better and safer at the rate for which it was

designed.

14. NEVER LEAVE TOOL RUNNING UNATTENDED,

TURN POWER OFF

Do not leave tool until it comes to a complete stop.

15. KEEP CHILDREN AWAY

All visitors should be kept safe distance from work area.

Do not let visitors contact tool or extension cord.

16. STORE IDLE TOOLS

When not in use, tools, should be in dry, high or locked-up

place out of reach of children.

17. STAY ALERT

Watch what you are doing. Use common sense. Do not

operate tool when you are tired, under medication, or

under the influence of drugs or alcohol.

18. KEEP COVERS IN PLACE AND IN WORKING ORDER

SPECIFICATIONS

MODEL 8587-210

Motor: 1/2 HP Universal open type, fan cooled (with intake air

filter)

Power Supply: The Model 8587-210 Grinder is equipped with a

120 Volt Universal Motor. Be sure that the voltage of the power

supply agrees with the voltage shown on the motor nameplate.

Spindles: Interchangeable. Spindles are not included. See

spindle chart on page 14.

Grinding Speeds: 3,750 to 45,000 RPM

Grinding Wheel Capacity: 1/2” to 6” (Varies with quill used)

External Grinding Capacity: To 6” diameter wheels (Varies

with quill used)

Internal Grinding Capacity: 18” deep at diameter of 1-7/8”

(Varies with quill used)

Mounting: T-Bolt

Dimensions:

Center line of spindle to base - 1-1/8”

Center line of spindle to center line of mounting post - 1-3/4”

Weight: Ship Weight: 46 lbs, without spindle.

SERIES 57

SPECIFICATIONS

MODEL 8584-210 (w/intake Air Filter)

Motor: 3/4 HP Universal open type, fan cooled ventilation

Power Supply: The Model 8584-210 Grinder is equipped with a

high speed, universal motor which operates on 120 Volt, 60 Hz.

Be sure that the voltage of the power supply agrees with the

voltage shown on the motor nameplate.

Spindles: Interchangeable. Spindles are not included and

must be ordered separately. See spindle chart on page 14.

Grinding Speeds: 3,200 to 42,600 RPM

Grinding Wheel Capacity: 1/2”to 6” (Varies with quill used)

External Grinding Capacity: To 6” diameter wheels (Varies

with quill used)

Internal Grinding Capacity: 18” deep at diameter of 1-7/8”

(Varies with quill used)

Mounting: T-Bolt

Dimensions:

Center line of spindle to base - 1-1/8”

Center line of spindle to center line of mounting post - 1-3/4”

Weight: Ship Weight: 46 lbs, without spindle.

SPECIFICATIONS

MODEL 8588-210

MODEL 8479

Motor:

Model 8588-210 has a 1 HP Universal open type, fan cooled

(with intake air filter). Model 8479 has a 1 HP induction: totally

enclosed, fan cooled.

Power Supply: The Model 8588-210 Grinder is equipped with a

120 volt Universal motor. The Model 8479 Grinder is equipped

with a 220/380-440 volt, 3 Phase, 50-60 Hz. induction motor. Be

sure that the voltage of the power supply agrees with the voltage

shown on the motor nameplate.

Spindles: Interchangeable. Spindles are not included. See

spindle chart on page 14.

Grinding Speeds: Model 8588-210: 3,560 to 47,500 RPM

Model 8479: 3,600 to 32,600 RPM

Grinding Wheel Capacity: 1/2” to 6” (Varies with quill used)

External Grinding Capacity: To 6” diameter wheels (Varies

with quill used)

Internal Grinding Capacity: 18” deep at diameter of 1-7/8”

(Varies with quill used)

Mounting: T-Bolt

Dimensions:

Center line of spindle to base - 1- 1/8”

Center line of spindle to center line of mounting post - 1-3/4”

Weight: 8588-210: Ship Weight: 46 lbs, without spindle.

8479: Ship Weight: 58 lbs, without spindle.

s RULES FOR SAFE GRINDING

1. Always wear Suitable Safety Glasses

(ANSI Type Z87.1 with side shields or an equivalent) Also

wear a face or dust mask if grinding operation is dusty.

2. Always “Ring or Vibration Test” Straight Wheels

Before Use

Sound wheels produce a definite ring when struck lightly

with a non-metallic object - screwdriver handle, etc.

Cracked wheels produce a dull or dead sound. Suspend

the wheel from a hole using a small pin or finger and test

spots about 45 degrees apart around the wheel, see figure

2 below. Never use wheels that do not ring

satisfactorily. Damaged wheels should be replaced

immediately. The wheel hole should be suitably oversize

to assure safety clearance under normal operating heat

and pressure. Certain wheels require vibration testing. See

page 17 for vibration testing.

3. Always Use Proper Wheel Balance

Never exceed the speed on the blotter of a grinding wheel.

Never mount a wheel on a grinder without checking pulley

combinations to make sure the speed is safe for the wheel

diameter and type. Blotters should be large enough to

cushion flange pressure for the entire bearing surface of

the flange.

4. Only Use Flanges Furnished With The Grinder

Flanges must match on straight wheels. If flanges are not

the same diameter, the wheel is under a bending stress that

is likely to cause fracture. If they are not properly relieved,

pressure is concentrated on the sides of the wheel at the

hole, a condition which sets up tremendous stresses and

which may cause the wheel to break.

• Both flanges, between which a wheel is mounted,

should be the same diameter and properly relieved.

The minimum size of flanges for straight wheels should

be at least one-third of the diameter of the new wheel.

• Straight wheels must have an outer flange. Both

flanges serve a useful purpose, and neither should be

omitted. Flanges should be checked for distortion or

abrasion.

• The outer flanges must not be reversed. The raised

bearing surface (relieved side) must be against the

wheel. Otherwise, unequal bearing surfaces produce

the same effect as unmatched flanges.

• A flat washer, a steel punching, or any other type of

filler material must not be used in place of a properly

relieved flange as the bending stress imposed upon

the wheel may cause it to fracture (see figure 1).

5. Always Use A Wheel Cover on External Grinding Jobs

The wheel cover will minimize the possibility of accidental

contact with the wheel by the operator and will help confine

grinding dust and grit. It will also aid in protecting, but does

not provide total protection, for the operator should the

wheel explode. Damaged wheel guards should be

replaced immediately.

6. Do Not Over Tighten Wheel Nut. Over Tightening Of

The Wheel Nut May Spring The Flange.

A sprung flange can cause stress concentrations which

may break the wheel. Under tightening of the spindle end

nut can permit wheel slippage which may result in

breakage.

• Torque wrenches are not applicable to tightening

single end nuts because normal thread wear cause a

continual change in the relationship between torque

applied to the nut and flange pressure on the wheel.

• The direction of the thread shall be in such relation to

the direction of rotation that the nut will tend to tighten

as the spindle revolves. The following rule will assist in

determining the proper relationship: “To remove the

nut it must be turned in the direction that the

spindle revolves when the wheel is in operation”.

All threads of the wheel nut should engage when tight.

CORRECT INCORRECT

Figure 1

CORRECT AND INCORRECT METHOD OF

MOUNTING STRAIGHT WHEELS

WHEEL BLOTTERS

FLANGE RECESS

TOWARD WHEEL

WHEEL NUT THREADS

FULLY ENGAGED

SPINDLE

FLANGES UNIFORM IN

DIAMETER AND

BEARING SURFACE AREA

FLANGE NOT RECESSED

WHEEL NUT THREADS

NOT FULLY ENGAGED

NO WHEEL BLOTTERS

FLANGE SPRUNG FROM

EXCESSIVE WHEEL

NUT TORQUE

SPINDLE

ONE FLANGE LARGER

IN DIAMETER THAN

THE OTHER

Figure 2

7. Stand At One Side

When starting and during the first minute of run time.

8. Run At Full Operating Speed

With wheel cover in place for at least one minute before

applying work.

9. Always Remove Pulleys, Wheel And Adjusting

Wrenches From the Grinder When Not In Use.

This compels every operator to make the speed selection

for the wheel diameter they are using.

10. Always Store Wheels Safely

Store them where they are protected from jarring, falling, or

blows from other objects. Do not store wheel in the grinding

case. Protect wheels from high humidity and freezing

temperatures.

We Recommend That Dumore Wheels Be Used With

Dumore Grinders.

s This Symbol Is Used Throughout The Manual To

Highlight Potential Dangers

MOUNTING CRITERIA

The Series 57 Tool Post Grinder is designed for use on lathes

with a 9” to 20” swing. All tool post grinding is done with the

grinding spindle center adjustment to the exact height of the

work center. Therefore, the distance from the top of the

compound to the center line of the lathe spindle, “X,” (Figure 14)

must always be equal to or greater than the distance from the

base of a grinder frame to the center of the spindle (commonly

referred to as the minimum mounting distance). If this condition

does not exist, the grinder will not fit the lathe, because the

grinding spindle cannot be set at work center. If the grinder is

being used on one lathe specifically, a good time-saving idea is

to make a metal spacer plate to fit between the mounting post

base and the base of the grinder frame so the tool automatically

lines up with the work center.

Figure 2

WARNING

PART #

MAX RPM

DUMORE CORPORATION

1030 Veterans Street

Mauston, WI 53948

NEVER EXCEED MAXIMUM RPM

AS LISTED ON WHEEL BLOTTER.

NEVER EXCEED MAXIMUM WHEEL

SIZE FOR SPINDLE OR GRINDER

NEVER RUN WHEELS WITHOUT RING

TESTING OR VIBRATION TESTING

BEFORE EVERY USAGE.

NEVER RUN GRINDER WITHOUT

BELT GUARD IN PLACE

NEVER RUN GRINDER PRIOR TO

CHECKING PULLEY COMBINATION FOR

RPM LESS THAN MAXIMUM RPM LISTED

ON BLOTTER

sVIOLATION OF THESE AND OTHER SAFETY INSTRUCTIONS AS LISTED IN THIS MANUAL

CAUSE RISK OF SERIOUS PERSONAL INJURY.

NEVER DO EXTERNAL

GRINDING WITHOUT

WHEEL GUARD ATTACHED.

Figure 6

Figure 5

Figure 4

Figure 3

Setting Up On A Lathe

Before setting the grinder up on lathe, mount the workpiece either

in a chuck, collet or between centers. The Series 57 Tool Post

Grinder is designed to fit in the T-slot of a lathe compound.

SET UP INSTRUCTIONS

1. Remove the mounting post from the grinder by loosening

the lock nut on the right side of the frame and pulling the post

free. Insert the T-bolt of the mounting post into the T-slot of

the lathe compound and tighten nut at the top as illustrated

in Figure 3.

2. After the mounting post is tightened, set the lathe

compound at any angle listed on the Chart, Figure 7 on

page 10. The starred 60° angles setting seems to be ideal

as the feed is set at .001”, and the actual cut into the work is

.0005”, while the reduction in the diameter of the workpiece

is .0010”. The gradations on a lathe compound dial are in

thousands, and your work will often call for accuracies of

tenths of thousands. The chart will be helpful in determining

how much stock is being removed, the actual cut, and

approximately what reduction is being made in the diameter

of the work.

3. Slip the grinder onto the mounting post and tighten the lock

nut, see Figure 4.

4. Loosen the two screws on the front of the grinder and insert

the grinding spindle into the grinder with the strip pin on the

grinding spindle engaged in the slot in the grinder. A

screwdriver may be used to temporarily expand the slotted

frame while inserting the spindle. Tighten the two screws on

the front of the grinder.

5. Loosen the lock nut and position the tool so that the spindle

is parallel with the workpiece. Set the center line of the

spindle at the center line of the workpiece and tighten the

lock nut. the tail stock center can be used to center the

spindle accurately.

6. Select the proper pulleys for the size of the grinding wheel

which is to be used and install the pulleys on the motor and

grinding spindle as shown in Figure 5. The proper pulley

combination is shown on the speed chart which is fixed on

the motor or belt guards. Check the speed chart each time

for proper pulley recommendations for each wheel size.

s WARNING: DO NOT EXCEED WHEEL SPEED

RECOMMENDATIONS, OR THE WHEEL COULD

EXPLODE.

s Caution: Do not plug grinder into the power source

until the grinder is completely set up and ready to grind.

The wheel cover is assembled to the grinder by slipping it over the

grinding spindle and tightening the screw as illustrated in Figure

6. First mount the wheel guard to the spindle. Next mount the

wheel flanges and proper wheel to the spindle. And lastly

assemble the wheel guard cover.

s WARNING: DO NOT EXCEED MAXIMUM RECOMMENDED

WHEEL SPEEDS AS MARKED ON EACH GRINDING WHEEL.

RING TEST EACH WHEEL FOR CRACKS PRIOR TO

ASSEMBLY ON THE SPINDLE. OBSERVE CAREFUL

HANDLING AND STORAGE OF GRINDING WHEELS. RUN AT

FULL OPERATING SPEED WITH WHEEL COVER IN PLACE

FOR AT LEAST ONE MINUTE BEFORE APPLYING WORK.

DURING THIS TIME, AND PARTICULARLY WHEN STARTING,

THE OPERATOR SHOULD STAND AT ONE SIDE.

Figure 10

NOTE: Before mounting the wheel, make certain that it is sound

and free of fractures; and it is equipped with proper wheel

blotters. This is done by ring testing the wheel to make

certain that it has not been damaged from improper

handling or improper storage. To do this tap the wheel

gently with a light non-metallic implement such as the

handle of a screwdriver or a rawhide mallet. (See “Rules for

Safe Grinding”). If the wheel sounds cracked or dead it

should not be used and should be thrown away.

7. Tap the wheel about 45° each side of the vertical center line,

and about 1” or 2” from the periphery. Rotate the wheel 45°

and repeat the test. A sound and undamaged wheel will give

a clear metallic tone or ring. If cracked, there will be a dead

sound - not a clear ring. The wheel can be suspended from

the hole by a small pin or finger. This test should be made

prior to mounting a new or used wheel, or if damage is

suspected.

8. Mount the wheel between wheel collars on the grinding

spindle. The relieved side of the collar should be towards

the grinding wheel on both sides. (See “Rules For Safe

Grinding”). With one wheel collar on each side of the wheel,

tighten the wheel and pulley nut. Do not tighten this

spindle nut, since this may cause excessive stresses

on the grinding wheel. A moderate tightness will suffice.

s WARNING: ALWAYS USE THE WHEEL COVER ON

EXTERNAL GRINDING OPERATIONS.

s NOTE: THE WHEEL COVER WILL MINIMIZE THE

POSSIBILITY OF ACCIDENTAL CONTACT WITH THE

WHEEL BY THE OPERATOR AND WILL CONFINE

GRINDING DUST AND GRIT. IT WILL ALSO AID IN

PROTECTING, BUT DOES NOT PROVIDE TOTAL

PROTECTION FOR THE OPERATOR, SHOULD THE

WHEEL EXPLODE.

9. The Series 57 Tool Post Grinder has automatic belt

adjustment by means of a tension spring. Since the motor

pivots on a tension shaft, the belt can be installed by

pushing the motor forward and slipping the belt over the

pulleys. By releasing the motor, the belt automatically

becomes taut. Attach belt cover hanger to frame and add

belt cover as shown in Figure 8.

10. At this point the grinder has not been plugged into the power

source. Make certain the switch is in the “OFF” position.

Spin the wheel mounted on the grinding spindle by hand to

make certain everything is free and in clearance.

s Check to make sure the supply voltage is correct. A 115 Volt

grinder plugged into a 230 VOLT socket would substantially

over-speed the motor and grinding spindle and could result

in an excessive speed which would cause the wheel to

break. After verifying the voltage, plug the cord, into a

suitable grounded outlet.

Figure 9

Figure 8

Angle Setting of

Lathe Compound

Feed On

Compound in Inches

Actual Cut Taken

Into The Work

Reduction in

Work Diameter

30°

45°

*60°

70°

75°

80°

84°

.001

*.001

.001

.00087

.00071

*.00050

.00034

.00026

.00017

.00010

.00173

.00141

*.00100

.00068

.00052

.00035

.00021

Figure 7

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