Ray Foster MT10 Manual

MODEL TRIMMER
MODEL MT10, MT12, and MT15
Operating and Maintenance Instructions
Sales, Service, and Technical Assistance
Call Toll Free 800 / 654-4519
Ray Foster Dental Equipment
5421 Commercial Drive
Huntington Beach, CA 92649
714 / 897-7795, Fax 714 / 898-6013

INTRODUCTION
Thank you for purchasing a quality Foster product. Your Foster Model Trimmer
is designed to give years of trouble free service with minimal care and
maintenance. Before putting your new machine to work, please become familiar
with this operator's manual to obtain maximum performance and satisfaction.
IMPORTANT SAFTEY INSTRUCTIONS
WARNING! When using electrical tools, basic safety precautions should always
be followed to reduce the risk of fire, electrical shock, and personal injury
including the following:
Read and Save this manual for future reference.
Use Proper Grounding. Your Foster Model Trimmer is equipped with a
three-conductor grounded cord and plug. It should be plugged into a three
hole grounded receptacle of the same voltage as inscribed on the machine.
Power Cord. Power supply, plug configuration, and electrical codes vary
from country to country. The cord supplied with your Foster Alloy Grinder is
approved for use in the country of destination. Use only this power cord or
one that is approved for use in your country.
Plug into a Branch Circuit with 16A Circuit Breaker. To reduce the risk of
fire and to protect the units electrical system plug into a branch circuit with a
16 amp circuit breaker.
Disconnect the Power Cord. Before performing any maintenance or repairs
turn the unit off and unplug the power cord to prevent electrical shock or
unintentional starting.
Wear Additional Eye Protection. Protect your eyes from model trimming
debris and the possibility of a fractured wheel by utilizing approved safety
glasses or goggles when operating the Foster Model Trimmer.
Wear Respirator Dust Mask. To protect against the inhalation of dust and
fumes a dust mask should be worn while grinding.
Keep Your Fingers Away From the Grinding Wheel. Use caution when
operating the model trimmer. If the abrasive wheel appears dull, don’t
compensate by applying more pressure, change the wheel.
Always Keep the Door Securely Closed . Be certain that the door is closed
and secured with the door secure knob before turning the machine on.
NEVER turn the motor on with the door open.

Wear Proper Clothing. Do not wear loose clothing or jewelry, which may get
caught in rotating parts. Tie back long hair.
Maintain the Unit. Inspect periodically for damaged or worn parts. Follow
the instructions for maintenance. Don’t use if the power cord, motor, switch,
or other parts are in poor condition. Don’t use if the unit has been dropped or
damaged. Have a qualified service person inspect and replace parts when
necessary.
For Laboratory Use Only. The Foster Model Trimmer is intended for use by
trained professional laboratory personnel only.
INSTALLATION
Place the model trimmer in a suitable counter top location next to a sink and near
a water source.
Water is supplied to your Foster model trimmer through a flexible polyethylene
hose, which is fitted with a 1/4" male pipefitting. If the available water source is
other than a 1/4" female pipe fitting, an adapter must be obtained to complete the
installation. A local plumbing supply will usually have the required adapter.
NOTE: It is recommended that you do NOT use copper tubing to connect the
model trimmer to the water supply. The problem with copper tubing is that it is
not flexible. This nullifies the feature of the hinged door because the hose must
flex when opening the door.
Water is discharge from the model trimmer through a 24" x 1” ID flexible hose.
Be sure that the hose slopes downward to the drain allowing gravity to drain the
model trimmer.
Longer lengths of both water supply and drain hose are available from Ray
Foster Dental Equipment if needed.
PREVENTIVE MAINTENANCE
FLUSH THE MODEL TRIMMER DAILY
Your Foster model trimmer is a workhorse in the dental laboratory. It requires
daily flushing and cleaning to prevent gypsum buildup and clogging. At the end of
each use allow the motor to remain on and open the water adjustment to
maximum for about 20 seconds. Turn the water off and allow the motor to run for
an additional 10 seconds. Wipe the exterior of the model trimmer off at the end of
each workday.

ELECTRIC MOTOR
The motor installed on Foster model trimmers is equipped with permanently
lubricated, sealed ball bearings. No lubrication or maintenance is required.
DOOR SECURE
When closing and securing the door, do NOT tighten the door secure knob. It is
only necessary for the door to "touch" the base casting for a leak free fit. Over
tightening may cause leakage.
USE PLENTY OF WATER
The use of an adequate amount of water while trimming will keep the wheel
clean and cutting. An inadequate volume of water will result in a clogged
unusable wheel.
CHECK THE WATER SPRAY TUBE
It's a good idea to occasionally check the water spray tube to be sure all holes
are open. A straighten paper clip is useful in opening plugged holes.
WATER VALVE
The brass water valve located on the door of the model trimmer is intended to be
used as a flow control only, and not intended to be used as a water shut-off
valve.
MODEL AND SERIAL NUMBER
When ordering parts or requesting service always give the machine model
number and serial number which are inscribed on the identification plate located
on the front of the Lab Master Model Trimmer.
EXCESSIVE VIBRATION
Excess vibration from your model trimmer is a result of one or both of the
following:
1. An imbalance in the aluminum back plate as a result of accumulation of
plaster and stone on the back.
2. An out-of-balance abrasive wheel due to stone build-up and/or wear, or an
improperly balanced or non-balanced wheel. NOTE: Abrasive wheels
purchase from us are precision balanced for smooth running. This is done by
removing a portion of the heavy edge. As a result of the balancing process
the wheel may be out-of-round, but is in balance.
To determine and correct an imbalance follow this procedure:
1. Remove the abrasive wheel from the model trimmer, close and secure the
door, and turn the model trimmer on with the wheel removed. If the vibration
has ceased, the problem lies with the grinding wheel, and a replacement is
needed. NOTE: Sometimes the center mounting devise of the wheel (P/N
M095 - Lock Button) is worn and does not center the wheel properly. A wheel
that is mounted off center will also cause vibration. To check the Lock Button,
remove it together with the wheel, and check it's fit in the center hole of the

wheel. It should slip into the center hole with no play. If it is not a snug fit, it
should be replaced.
2. If the vibration is still present with the wheel removed, the problem lies with
the aluminum back plate (P/N M222 for MT10, P/N M221 for MT12 and
MT15). The backing plate must be removed and cleaned of all plaster, or
replaced. To remove the aluminum back plate a Back Plate Removal Tool
(item M816) is needed. Please refer to the "Accessories" section of this
manual.
INSTALLATION OF REPLACEMENT WHEELS
1. Unplug the model trimmer from the electrical power source, remove the door
secure knob (A), and swing the door open wide.
2. Loosen the three screws and remove P/N M095 Lock Button (B). The old
wheel may now be removed from the trimmer. Remove the P/N M096 Cork
Gasket (C) from the backside of the attach button, and replace it with the new
gasket included with all Foster replacement wheels. If only reversing the
existing wheel or using a wheel from a source other that Ray Foster, make
sure that the existing cork gasket is in good condition, if not, a new one is
needed. This is essential in preventing slippage of the abrasive wheel.
3. Install the new replacement wheel flush with the aluminum back plate,
aligning the center of the wheel with the arbor hole of the back plate, and
aligning the drive pin hole (D) of the wheel with the drive pin of the back plate.
4. Replace the lock button with the three screws. Tighten the three screw
evenly, in rotation, and firmly enough to pinch the cork gasket.. Close the
door of the model trimmer, and secure it with the Door Secure Knob (A). Your
Foster model trimmer is now ready to operate. CAUTION: NEVER
OPERATE OR TURN ON THE MODEL TRIMMER WITH THE DOOR OPEN.

ACCESSORIES FOR FOSTER MODEL TRIMMERS
Automatic Solenoid Water Valve – Cat. No. M008
Turns the water on and off automatically and simultaneously with
the motor. A great convenience item. Comes complete with
illustrated instructions for easy installation.
Sediment Tray – Cat. No. M006
Helps keep the counter free of splash and drippings. Handy tray in
front for models. Made of sturdy cast aluminum and powder coated
to match your Foster model trimmer.
Foot Switch – Cat. No. M802
Maintained operation: Push-on / push-off, rated at 10 amps.
Orthodontic Work Table Complete – Cat. No. O100
Convert your 12” Foster Model Trimmer to an Orthodontic Model
Trimmer capable of trimming accurate and attractive study models.
Back Plate Removal Tool – Cat. No. M816
If the Aluminum Back Plate (P/N M221 / M222) must be removed
for imbalance corrections, repairs, etc., a Back Plate Removal Tool
is essential. Simple illustrated instructions included.
Splash Shield – Cat. No. M005
Protect your face and clothing from splatter with an easily installed,
fully adjustable splash shield.
Diamond Abrasive Wheel
Cat. No. D912 – 12” Diameter, Coarse
Cat. No. D910 – 10” Diameter, Coarse
Coated Abrasive Adhesive Discs
Cat. No. A025 – 12” Diameter, Coarse #50 Grit, 4 Pcs
Cat. No. A028 – 10” Diameter, Coarse #50 Grit, 6 Pcs
Cat. No. A031 -- 12" Diameter X 3/16" Plastic Mounting Wheel
Cat. No. A032 -- 10" Diameter X 3/16" Plastic Mounting Wheel

PARTS DIAGRAM

PARTS LIST
REF. PART
NUMBER NUMBER DESCRIPTION
1 M009.................................................................................Screw, Switch Box Attach
2 M020........................................................................................Switch Mounting Box
3 M024....................................................................................... Rubber Switch Cover
4 M081.................................................................................................... Motor Switch
5 M138..........................................................................................Electric Power Cord
6 M201...........................................................................Motor Mount Bolt (4 required)
7 M202......................................................................................... Washer (8 required)
8 M203........................................................Rubber Motor Mount Bushing (8 required)
9 M210......................................Base Casting for 10" M.T. (sold as set only with Door)
M212……... ............................Base Casting for 12" M.T. (sold as set only with Door)
10 M211......................................................................................................... Hinge Pin
11 M204..............................................................................Nut, Motor Mount Retaining
12 M216...................................................................... Set Screw, Back Plate Retaining
13 M221.................................................................... Aluminum Back-Plate for 12" M.T.
M222.................................................................... Aluminum Back-Plate for 10" M.T.
14 E022 ............................................................... Abrasive Wheel, 12" Medium Coarse
E21A ............................................................... Abrasive Wheel, 10" Medium Coarse
15 M097................................................................................... Screw, Wheel Mounting
16 M104KIT .................................................................... Door Gasket, Silicone Rubber
17 M240......................................Door for 12" M.T. (sold as set only with Base Casting)
M241......................................Door for 10" M.T. (sold as set only with Base Casting)
18 M018............................................................... Water Spray Tube & Valve Assembly
M019............................................................... Water Spray Tube & Valve Assembly
19 M244................................................................................ Plastic Knob, Tray Secure
20 M245................................................................................................. Washer, Nylon
21 M117.............................................................................. Water Supply Hose, 3 Feet
22 M108................................................................................................. Door Lock Bolt
23 M095................................................................... Lock Button with Screws & Gasket
24 M096..........................................................................................Lock Button Gasket
25 M247...................................................................... Standard Work Tray for 10" M.T.
M248...................................................................... Standard Work Tray for 12" M.T.
26 M249.......................................................................................................... Drive Pin
27 M255...........................................................................................Rubber Water Seal
28 M257........................................................................................ Cap Nut (4 required)
29 M258................................................................................... Rubber Feet (4 required
30 M259.......................................................... Screw, Front Feet Mounting (2 required)
31 M260........................................................... Screw, Rear Feet Mounting (2 required)
32 M136.................................................................................................Clean Out Plug
33 M263.........................................................................................Adapter, Drain Hose
34 M130........................................................................................... Drain Hose, 2 Feet
35 M109............................................................................... Plastic Knob, Door Secure
36 M100.................................................................................Motor 1/3 HP for 10" M.T.
M120.................................................................................Motor 1/2 HP for 12" M.T.
M816................................................................................. Back Plate Removal Tool
When ordering replacement parts always include machine model number
and serial number as well as individual part number.

Warranty
Ray Foster Dental Equipment warrants Foster Model Trimmers to be free of defects
in material and workmanship for a period of one year from the date of purchase by the original
user.
To obtain warranty service, the Model Trimmer or defective part, together with proof of
date of purchase, must be delivered freight prepaid to the factory in Huntington Beach,
California. t its option, Ray Foster Dental Equipment Company will replace or repair the
defect free of charge, providing the Model Trimmer has not been subjected to abuse, neglect,
damage, or used in a capacity other than which was intended.
Ray Foster Dental Equipment
5421 Commercial Dr, Huntington Beach, CA 92649
714 / 897-7795, Fax 714 / 898-6013