Foredom T35A User Manual

FOREDOM®T-35A

General Information

The Foredom T-35A Air Turbine Handpiece is capable
of generating 350,000 RPM’s (revolutions per
minute) Rotation is accomplished by forcing air at a
maximum rate of 40 P.S.I.– (pounds per square inch)
across an impeller or turbine which holds the collet.

The unit generates substantial speed, but little
torque, making it ideally suited for operations such
as cutting, carving, engraving,texturing, and fine
detailing with carbide or diamond points on materi­als such as metal, bone,stone, porcelain, plastics,
glass, and hard woods.

Use a delicate touch on softer material and woods,
or the bur will bury itself and stall the handpiece, as
is the case when too heavy a cut is attempted.

Filtered and regulated air is fed into the handpiece
through an on/off foot pedal, or the air flow can be
turned off and on at the regulator. Clean, dry air is
an absolute requirement to run this machine effi­ciently,as any foreign particles generated by or from
the air source (compressor) will be thrown into the
turbine and eventually clog and/or damage it.

With proper use and maintenance, the Foredom
T-35A Air Turbine can give a lifetime of use.
However, if a few basics are not observed, like any
fine instrument or machine, the unit will eventually
develop problems that will worsen if not corrected.

Be sure that the tubing used to connect the
handpiece to the air source is rated for the out­put pressure of the compressor. The unit

• Wear a respirator to prevent the inhalation

of dust particles.

• Do not cover exhaust port at the rear of

handpiece during use.

• Keep the work area clean and organized.

• Keep children out of the work area and away

from any operating or moving machinery.

• Keep the foot pedal out of the way to avoid

accidental starts.

Changing Burs

To insert a bur, push the collet release plunger
and insert the bur into the collet. Make sure
that the bur is fully inserted into the collet
before releasing the collet release plunger.
Bur removal is easy: press the collet release
plunger and pull the bur out.

Service

Factory service is available by sending your
T-35A Air Turbine Handpiece with a note
stating the problem to:

The Foredom Electric Company

16 Stony Hill Road, Bethel, CT 06801 USA
Attn.: Service Department

Replacement Parts

Item Description Part No

Turbine Cartridge with Collet HP90038
Lubricant in Dispenser HP93514
Nose Cap HP93533
Spanner Wrench HP93513

Air Turbine Instructions

requires a minimum of 1.5 C.F.M.–cubic feet
per minute (42.5 liters per minute) of air at 40
P.S.I. (2.76 bar) which is also the recommended
operating pressure.A 1/4 HP or larger compressor
is required to generate this air pressure on a con­tinuous basis. If you have purchased a handpiece
only, you must install an industrial filter in the air
line.As air is being compressed in the compressor,
heat is generated that causes a temperature
differential between raw air and compressed air
introducing moisture into the system which, in
turn, is forced with the air into the air line
feeding the handpiece.Without an in-line separa­tor/ filter, impurities such as moisture or dirt are
carried with the air and forced against the
turbine impeller in the handpiece and will
damage the turbine.

Safe Operation

• Always wear proper eye protection when

using this and other power tools.

• Never operate the handpiece without a bur in

the collet.

• Always use 1/16″ (1.6mm) shank friction grip

burs rated for 350,000 RPM.

• Tie back long hair, and avoid wearing jewelry

or loose clothing that could get caught in a bur.

• Use a suitable dust collection system that will

remove not only larger dust particles, but also air
borne dust from the work area.

• Develop a light, but sensitive and controlled touch as

bur makes contact with material.

• For accuracy, dexterity, and comfort, hold the handpiece

loosely,but with enough pressure to maintain control.

Rev T-35A Inst. 2/7/03 2:38 PM Page 1

Lubricating the T-35A Handpiece

Oil daily prior to use with 2 drops of Foredom
Handpiece Lubricant in dispenser.

1. Turn Oil Hole Ring so that oil hole aligns with
red dot on handpiece housing.

2.Squeeze 2 small drops of oil into hole using
oil dispenser.

3. Turn oil ring about 1/4 turn to cover hole.

4. Run handpiece briefly to spread oil while cover­ing rear exhaust ports with a cloth or paper
towel to catch any excess oil that may blow out.

Caution: Never clean the turbine’s head
with compressed air– it can damage
the bearings.

Maintenance of Air Filter

If you ever notice an accumulation of liquid in
the air filter container, press the evacuation
valve upwards to evacuate the liquid. Check
your air source’s filter.

Oil Hole Ring

Oil Dispenser

Oil
Hole

Collet
Release
Plunger

Red
Dot

Installing/Replacing the
Turbine Cartridge with Collet

To remove a Turbine Cartridge follow these
instructions:

1.Remove the Nose Cap using the small end (8mm)
of the spanner wrench, and turn it counterclockwise.

2.Remove Turbine Cartridge by pulling it out
with fingertips.

To insert a new cartridge or to re-insert
one, be sure to follow these steps:

1.Line up the small knob or button on the
Turbine Cartridge (see below) with the Groove
inside the front part of the Handpiece Housing
(at left below) while inserting the Turbine Cartridge.

This is necessary for the cartridge to seat correctly
with the air ports in proper alignment.

2. When Turbine Cartridge with Collet is inserted into
position, screw on nose cap.Tighten firmly with
small end of spanner wrench. Insert a bur and
run handpiece briefly to be sure that it is
functioning properly.

Turbine Cartridge
with Collet

Small Knob
or button

Nose
Cap

Groove

The Foredom T-350K2Air Turbine
Kit Contains:

T-35A Handpiece with hose adapter
and instructions

Air Filter/Regulator in stand/wall mount
Push fittings
3 Assorted Carbide Burs
Owner’s Manual
2– 6’ lengths of Air Hose (The hose connecting

compressor to filter/regulator is not supplied.)
On/Off Foot Pedal

Form 906 n 1/03 Printed in USA

LIMITED WARRANTY

Foredom warrants the T-35A Air Turbine
handpiece to be free of defects in material or
workmanship for a period of 1 year after
purchase. This warranty does not cover
damage caused in transit or by accident,
misuse, or ordinary wear. Repair or replace­ment will be made at our option if the
product is returned post-paid to the address
on reverse. All warranty repairs must be done
at the factory. This warranty only covers the
original purchaser of the product.

Rev T-35A Inst. 2/7/03 2:38 PM Page 2