MITS FP-21T 60 Manual

MITS ELECTRONICS
Aug 25, 2008
Maintenance
Procedure
SpindleMotorfor
FP‐21Tmodel60‐100
MITSElectronics

1
Thank you for purchasing our PCB prototyping machines.
To ensure correct operation, please read this manual carefully to learn how to handle
the spindle motor provided with the PCB prototyping machine.
[Before using the spindle motor]
This spindle motor is used for FP-21T model 60, model 100 of our PCB prototyping
machines. It has great features of high speed and high precision. This spindle motor
is widely used for same types of machines provided by many other companies. From
this fact it is obvious that it is the only one spindle motor in the whole world which
has advantage of compactness, high velocity revolution, and high precision.
Although it has great features, the spindle motor is such a delicate product that it
needs to be handled with great care. We are asking you to use the spindle motor with
great care in order that you should take full advantage of the spindle motor without
any troubles.
Please ensure to use this spindle motor in accordance with the following instructions.

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1. Needs Frequent Cleaning
The initial failure of a spindle motor is mostly caused by scraped particles getting
inside a collet chuck.
Scraped particles are generated every time when the spindle motor cuts a board or
etc. We have already provided our PCB prototyping machine with vacuum cleaner
function. However, it is difficult to completely avoid a small amount of scraped
particles getting into the engagement region between the collet and the body of the
spindle motor.
The parts shown in the picture above have the structure as shown in the drawing at
right. You need to clean these designated parts: the inside diameter region, the slit,
the taper, and the pilot of the collet; and the taper region within the spindle motor.
Even a small amount of scraped particles remaining in the engagement region can
deteriorate the rotational precision and weaken the holding power of a drill.
Gradually the drill may become loose resulting in failure of the spindle motor and
finally damage to our PCB prototyping machine.
We highly suggest that you clean the spindle motor with the cleaning set provided
every time you finish processing.
<How to clean the spindle motor>
Clean the inside of the taper with a brush provided with the system.
Do not use the air unit while cleaning the spindle motor. If you use the air, scraped
particles are more likely to get into the inside of the spindle motor.
Inside diameter region
Slit Taper of spindle motor
Taper of collet Pilot

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1) Remove a connector of the motor.
2) Mark the place for the motor to be mounted with a colored tape or etc. as shown in
the photograph.
3) Loosen the set screws of pressure foot.
4) Remove pressure foot.
5) While holding the spindle motor, loosen screws of the spindle motor.
*Note: Do not tighten the screws too hard when mounting the spindle motor again.
6) Remove the spindle motor through the top.
Connecto
Mark tape
Pressure
f
oot
Spindle motor holder

4
7) Press down a change knob, and then rotate the change knob counterclockwise (as
viewed from the top) to remove the collet gradually. The knob should be pressed
down firmly while being rotated.
Scraped particles are remaining in the collet, and the taper region inside of the
spindle motor.
8) Remove scraped particles from the collet and the taper region.
Never use the air when removing scraped particle.
Scraped particles are remaining

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9) Set the collet in the spindle motor after finishing cleaning,
There is a projection on the inner surface of the spindle motor for securing the
collet.
Ensure that the flat area of the collet (see the photograph at left) is fitted to this
projection. Turning the collet little by little in order to fit to this projection. The
collet can easily go all the way to the end, if it is fitted in the right spot. Do not
push the collet with excessive force. It will hurt a shaft within the spindle motor.
Projection inside for securing the collet Projection inside for securing the collet
A flat area for securing the collet within
the spindle motor
The collet after being inserted into
the spindle motor completely
Be sure to install a dummy tool in the collet after setting the collet.

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After setting the tool, press down the change knob, and then rotate the knob
clockwise as viewed from the top.
Knob should be rotated while being pressed down firmly.
2. Ensure to prevent scraped particle from entering inside through the knob.
For the same reason above, the force of fastening the drill will become weaken if
scraped particles get inside through the part designated with an arrow as shown in
the photograph below.
Please be sure to use the spindle motor with less dust
3. Handling a Knob
1) Release a Knob lock.
After completing the replacement of a drill, please ensure that the knob is in
upward position.
In the operation of spindle motor, do not turn on the power with the knob in
downward position. It may cause burnout.
Press down the knob firmly
Do not rotate it unless the knob is pressed
down enough. It will cause wear and tear of
the engagement inside.

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2) Replace the tool after the motor has completely stopped
Never turn the knob to replace the tool before the motor has completely stopped.
It is extremely dangerous to do this, and will also lead to damage of the knob
engagement.
3) Tightening the drill completely
Ensure that the knob engagement is in proper position. Turning the knob in
improper position will damage its engagement tooth.
Especially for router cutting, a large torque is needed. For this reason, if you fail to
fasten the knob enough, the tool will become loose gradually and coming off from
the chuck. You need to tighten the knob more firmly especially for router cutting.
4. Need to install a drill in the collet
Be sure to install a drill or a dummy tool in the collet all the time.
And also, never tighten the collet without installing any drill in it. It will decrease
the precision of the collet and cause malfunction.
Press down the knob firmly
Do not rotate it unless the knob is pressed
down enough. It will cause wear and tear of
the engagement inside.
Pull up the knob

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5. In case something abnormal occurs
If you find something wrong, stop the machine immediately.
Remove the spindle motor referring to the description in the section of “How to
clean the spindle motor” above, and then send this spindle motor to our company.
Please do not disassemble the motor and nor reassemble it by yourself.
6. Advice to have a spare spindle motor
If you use our prototyping machine too frequently, we encourage you to have a
spare spindle motor
7. Warranty for spindle motor
The spindle motor is covered by one year warranty under normal use with appropriate
maintenance. However even within one year, if the total operation hours of the spindle
motor exceeds 2000 hours, your spindle motor has to be repaired at your own expense. .
One year warranty does not cover damage by improper use as described above. The repair
cost is expected to be substantially high as the repair needs the replacement of precision
parts and precise assembly
8. Overhaul
Basically, we encourage you to overhaul your spindle motor with more than 2000
operation hours. After the overhaul, you will obtain the spindle motor having the similar
features as a new one.
9. Collets are expendables
Collets are expendables and need periodical replacement.
It is time to replace the collet when the surface of the collet become lusterless or the collet
is no longer able to chuck the tool bits securely enough.