KBC SG-612 Building instructions

MACHINEW DIVISION
6465 18 MILE ROAD
STERtiNG HEIGHTS, MI 4831 4
PHONE:
(586) 751 -3500 * 1-000-860- 1740
9 , 'T:m"a FAX:
(97J&acLJfljpj~@;fii]
-~..~-c!J
(556) 731 -7464 * 1 -800-862-1 740
MODEL SG-612
SURFACE GRINDER
THANKYOU FOR PURCHASINGWlTH KBC MACHINERY. ALL KBC
MACHINESARE BACKED BY OUR
1 YEAR PARTS REPLACEMENT
WARRANTY. WHEN USED AS INTENDED, AND WlTH PROPER
MAINTENANCE THIS MACHINEWILL PROVIDEYOU WlTH YEARS OF
TROUBLE-FREESERVICE. IFYOU NEED PARTSSIMPLY FILLOUT
THE PARTS REQUEST FORM, AND FAX OR E-MAILYOUR REQUEST.
ALL OTHER QUESTIONSPLEASECONTACT US
@ :
KBC MACHINERY
6465 18 MILE ROAD
STERLING HEIGHTS,MI 48314
PH [phone]
FAX [phone]
[email protected]
WWW.KBCTOOLSANDMACHlNERY.COM
www. KBCTOOLS. COM

PARTS REQUEST FORM
YOUR COMPANY NAME::
STATE/PROVINCE
YOUR NAME
PHONE # + EXT
FAX #
MACHINE INFO:
MAKE~MANFACTURER
MODEL NUMBER
YEAR MADE
PARTS REQUESTED:
PART# DESCRIPTION
PLEASE INCLUDE COPY(S) OF THE PARTS DRAWING FROM THE
MANUAL
AND CIRCLE THE PARTS NEEDED
FAX PARTS REQUEST TO (800) 862-1 740
E-MAIL PARTS REQUEST TO:
machinery@kbctools . corn
THANKS; KBC MACHINERY - MICHIGAN

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HAND OPERATED
SURFACE
GRINDING: MACHINE
SERVICE MANUAL
I ACCURACY
I FAST PRODUCTION
I LOW MAINTENANCE

Operating Controls and Set-Up Adjustments
of the
Precision Micromaster Surface Grinding Machine
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1. Spindle " start-stopv Buttons.
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2. Sable Dog.
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3. Vertical Adjustment Handwheel.
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4. Table ~o~sto~.
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5. ~able-~o~.
6.--Table TravelHandwheel.
7. Cross Feed ,Handwheel
8. Shield Plate.

Installing or Relocating the Machine
In liftingor moving the machine it is rexomended
that the rope be rigged as shown in Fig 1. Place
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wooden blocks or protective material be ween the
rape and the machine wherever the rope is 1 iable to
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damage any part.
If available, a '!tork-)ar~truck" can be used to
more t,e machine. The Iift
IS located under s!eel
bars positioned in the holes :in the base of the
macnine
CAUTION: DOnot push on the uprignt when mor-
ing the machine unless the rods and strap used in
Precision spirit level mddrive a woodcn ehingla
under any corngrpr corners that maybe-low.Mak
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sure that all four corners arr supported; then tigt
ten the lag screws, test the level of the tab1
surface again inboth directions and readjust i
necessary.
Connecting to Power Supply. The machine
should be connected to the power I ine and proper.
ly grounded. The lines from the power source
should be connected to the magnetic starter,
mounted on the right side of the machine.
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shipping are in pl8ce.The uprighl is a sliding mem- Checking Motor Rotation. Press the magnetic
her heldon by itsown ~e~ghtand the cross feed starter "start" and observe the direction of Spindlr
screw. Considerable dclmaqe can be caused to the rotation. The s~indleshould rota:+ :lockwis~ as
C~OSS :en3 screw II uprrght is tilted on its w3ys. seen from the front of the rnnch~ne. If the direc-
rhCmD:hln~ should be located on a level founda- tion of rotation is countercIockwlse, Change two
tion or !loor, a solid vibrationies; foundationbeing wires at the starter.
essential
where the finest finish must be produced.
If the machine must. iel
ol a wooden floor,locate
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it 3vft 3 heam and on a port~on 01 rhe lloor which
is frgn 3: \rlSrat$on.
In case the foundation or floor
ura,oicably transmits vib:ation to the machir#e,set
the mac'71ne on a s";ock-aSsorbing pad.
'ii"8mc tile rnachlne inposition, test the surface
of !he tnslc both long~tudinal any cross with a

Set-Up ~djustments
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Since the clamp screw merely holds the thrust
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collar inposition and &es not govern the closeness
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of adjustment, there is no reason to use excessive
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clamping pressure.
For normal surface grinding or when grinding
shoulders with the outer face Of the wheel, the
clamp screw can be released, leaving the thrust
springs to take
up end play automatically.
Wheel Speed. when the Spindle is driven by a
60 cycle direct drive motor, the full loadspeed is
3450 R.P.M. using a 7" diameter wheel, Y2" tnick.
Wheel Guard. The wheel guard is a one-pi+
jnit cover on the front. The cover opens upward
and is held closed by four knurled-head screws.
All that is required to remove the wheel is to lift
the cover.
However, it is necessary to remove the wheel by
guard-removethe wheel.
Two clamp screws located on the clamping edge
af the whee! guard support can be loosened and the
guard tipped either side of horizontal if necessary
Warning: Always make sure that the guard is
securely clamped before starting the machine; and
never run a wheel without having the guard and its
cover inplace.
Care and Use of Grinding Wheels
Selecting the Wheel. In order tc produce the
desired quality of work inthe shortest time real
care is necessary inchoosing the wheel which is
best for the job at hand.
Mounting Wheels. One general-purpose grinding
wheel and one wheel sleeve are furnished with the
rnachine. When additional wheels are used, extra
wheel sleeves should be procured
so that each
wheel can be kept on its own sleeve.Thus, in
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i,,g from one type of wheel to another, the wheel
and sleeve can be changed as a unit and will re-
;ain concentric,requiring only a minimuma mount
3f truing.
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The wheel should flt easlly on tM *meel sliev
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yet not l&sely, for If it Is lwselt.cennot be c
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tered accurately and will consequently be Out 0
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balance. Do not wrapthe sleeve with psper etc. to ~ ,,,, ;:.$
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make a wheel fit when the hole istoo large. it is . ; . .: .
The vertical adjustment hand wheel
is shown near the top of the uprtght
better from all standpoints either to discard such
a wheel or recase the core.
A wheel that fits a trifle tightly may crack if
forced on the sleeve. If the hole is only a little
under size it car easily be scraped out to fit.
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Warning: Before mounting a wheel, hang it in
the air on one finger; then lightly tap the edge of
the wheel and see
if it gives a clear ringing sound.
A wheel that does not ring clear is probably cracked
and should not be used.
The inner of the two flanges between the wheel
is mounted is a part of the wheel sleeve. The outer
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flange consists of asteel disk or washer,which is , :
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keyed to the wheel'sleeve to keep it from turning . ~,;ij3;~
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and loosening the clamping nut.
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..- truing should be discarded or returned to the wheel
mmufacturer-though incases of necessity the con-
STEEL
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wheel beneath the flange and filling with leadas
indicated by a test for static balance.
Wheel Truing.
A wheel truing fixture isfurnished
Proper mounting with the machine. The truing diamond
( furnished )
of grinding wheel. may be applied to the wheel along any
1 ine on the
lower half of the wheel circumference, though pre-
ferably at the bottom of the wheel
as show. To
To equalize the clamping pressure, washers of
cardboard or rubber should be placed between the
wheel and the two flanges, Most wheels of the sire
used on this machine have a ring of heavy blotting
paper on eacn sloe, which serves the Purpose.
Using the pin wrench furnished, tighten the
Clamping nut enough to hold the wheel firmly in
place On the sleeve. Do not tighten too much,how-
ever, as excessive clamping pressure will crack
the wheel.
Changing Wheels. In removing a wheel sleeve
from the spindle, always use the wheel sleeve
puller (furnished with the machine) to avoid any
chance of cracking ithe wheel or damaging the
spindle bearings by pounding. Remove the spindle
nut
( this nut has a left-hand thread the outer mem-
ber of the wheel sleeve puller into the wheel sleeve
and tighten the inner screw against the spin-die,
thus, loosening the wheel sleeve without harmful
jarring.
Inputting a wheel onthe spindle, examine both
the wheel sleeve hole and the spindle.end are per-
fectly clean. Then slip the sleeve onto the spindle,
seat it by hand and tighten by means of the clam-
ping nut and wrench.
Balance of Wheel. It is essential that the wheel
run perfectly true and without vibration. Grinding
wheels are balanced by the manufacturer and, in the
prevent gouglng, the center line of the diamond tool
should point slightly the center of the wheel inthe
direction of movement of the wheel surface.
The wheel should be trued each time it isput on
inespindie and wnenever it becomes loaoed, duli
or glazed. Pass the diamond across the wheel with
a slow, steady manual cross feed, taking care to
avoid any longitudinal movement of the table.
In truing a wheel for for rough grinding, take a
cut aWut O.Olm/m deep inone pass of the diamond
across the wheel and finish with a similar cut
0.000,25" deep. If the wheel is to be used for fini-
shing grinding,take two O.Olm/m cuts; then take twc
or three additional cuts removing about 0.000,25" eact
time, and finally pass the diamond across the wheel
once or twice without further advance of the wheel.
I. . . Wheel truing fixture in use.
case of wheels of the size used on. this machine,
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should not require attention inthis respect other than The figures stated are ao~roximateand under some
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conditions should be varied somewhat to give desired
truing. A whbel that runs badly out of balance after results.
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Movable wheel slide upright contributes
immeasurably to accurate slot
grinding.

optional Mechenism'and Additional Equipment
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(Furnished at~itracost) - ~ - ~~ ~-~~-
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Various items of add~tionalequipment avatlable
as extras are described and illustrated in this cha-
pter. Instructions are also given on their set-up
and use.
These extras include Magnetic Chucks and
Precision Grinding Vlse.
Magnetic Chucks
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The Rectangular Model Permanen: Magnet Cnu-
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cks provide a quick, easy means of holding a vai-
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iety of ferrous work for surface grinding. A 1800
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movement of the control lever turns the chuck on
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or off; and since the chuck does not use electric
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I! current, it can be left turned on for long as desired
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without heating.
Permanent Magnet Chuck.
Precision Grinding Vise
For highest accuracy ingrinding work parallel,
the top surface of the chuck should be ground each
time the chuck is mounted on the machine. Be
sure that the chuck isturned on before doing this,
and remove only the minimum amount of metal
required to grind the entlre top surface.
The chuck shouldnot be subjected to excessive
heat, shocks or blows, and the top sho!
' be kept
free from pits and scratches. Regrind the top sur,-
face occasional 1 y if necessary ,as a smooth surface
is essential for grinding work parallel.

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1 GRINDING SPINDLE ' - 30 BEARING
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2 FRONT~NUT . . .. . . 31ELEVATING SEAT
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3 GRINDWHEEL LOCKING NUT 32 ELEVATING BASE
4 GRINDWHEEL LOCKING BASE 21 L"CK-W€€
5 FRONT LOCKING NUT p
6 BEARING 35 SADDLE MOUNT
7 GRINDWHEEL BLOCK 36 PRESS BAR
8 BEARING 37 BASE
9 CONNECTION BOX
10 MOTOR CASE
1'1 HANDLE (PLASTIC)
12 HANDLE BAR
13 GUIDE ROD
14 WORKING TABLE
HEXAGON SCREW
RACK
GEAR
KEY
HANDLE
HANDWHEEL
DIAL
BEARING BLOCK
BEARING
LONGITUDINAL NUT
LONGITUDINAL WORM
HANDLE
HANDWHEEL
KEY
DIAL
38 POWER SWITCH
43 LIFTING RING
44 LOCKING SCREW 1
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46 PULLEY
47 ELEVATING WaRM
48 GUIDE PLATE
49 BEARING BLOCK
50 GEAR BOX
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