Installation Manual

ManualsBrandsGenmitsu ManualsMilling machinesGS-775M 20000RPM 775 CNC Spindle Motor with 5mm ER11 Collet Set, CNC 3018 Upgraded Accessories, DC 24V, High Power, Noise Suppression, Electrical DC Motor for 3018 CNC Router Machine

How to Install the ER



Collet

Things you may need

Genmitsu ER

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Precision Spring Collet Set (https://www.sainsmart.com/products/genmitsu-

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pcs-er

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Genmitsu

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pcs ER

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-A Collet Clamping Nut (https://www.sainsmart.com/products/genmitsu-

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Introduction

What the ER



collet system is on your router and how to use it. This is very important to ensure

your bit is mounted correctly. This is the

standard

’

tool holder for small routers. ER is the

name

’

11 means that it has an 11 mm diameter at the bottom of the taper in the holder.

Why is a collet system is used, why not just mount a chuck which would be more versatile and

easier to adjust? A Collet system will:

Clamp the bit more

ﬁ

rmly.

Give a superior alignment of the bit within the holder.

The drawback is that the size of the collet used must be matched to the diameter of the bit

shank, but di

ﬀ

erent sized collets are relatively cheap.

It has 3 parts, Holder, Collet and Clamping nut:

•

Summary of content (7 pages)

PAGE 1
How to Install the ER Collet Things you may need Genmitsu ER Precision Spring Collet Set (https://www.sainsmart.com/products/genmitsupcs-er -precision-spring-collet-set?_pos= &_sid= c e f&_ss=r) Genmitsu pcs ER -A Collet Clamping Nut (https://www.sainsmart.com/products/genmitsupcs-er -a-collet-clamping-nut?_pos= &_sid= c e f&_ss=r) Introduction What the ER collet system is on your router and how to use it. This is very important to ensure your bit is mounted correctly.
PAGE 2
Holder Normally factory ﬁtted onto the motor shaft as it is a very tight or interference ﬁt onto the shaft in order to keep it exactly aligned. It is further held by two grub screws tightened onto the motor shaft. It can be removed and replaced but will probably require heating to slacken the ﬁt and the very careful application of force to avoid damaging the motor.
PAGE 3
The Collet ﬁts round the shank of the bit and slides into the tapered interior of the holder. Near the bottom is a groove which ﬁts into the clamping nut and at the bottom another taper which matches the clamping nut. The slots cut through the collet allow the segments to be forced inwards round the bit as it is tightened into the holder. There is obviously a limit to how much it can be compressed meaning the hole through the collet must match the diameter of the shank of the bit.
PAGE 4
ER Collets are described by the internal diameter. So a mm collet is designed for a bit with a mm shank diameter. There is a bit of tolerance built in due to the clamping action so a mm collet will also take a 1/8 ” or . mm shank. A 1/4” shank is . mm so it’s closer to the tolerances but a mm or mm collet should work. Depending on the bits you use get the collets to ﬁt them, if you frequently use mm bits then get a mm collet, if you often use 1/4” bits get a 1/4” collet, if you use both, get both.
PAGE 5
Before inserting a new collet make sure; • The inside of the tool holder is clean and free from dust and debris. • The collet itself is clean, on the outside of the tapers, in the spaces between the collet segments and in the bore which will take the bit. • The nut is clean and free from debris around the retaining ring and on the bottom taper.
PAGE 6
The left photo shows a correct alignment with the collet aligned with the nut and the bottom taper sitting on the corresponding part of the nut. On the right the collet is not aligned with the nut, the bottom taper is resting on the retaining ring rather than it being in the slot of the collet. When tightened from this position the collet will be forced out of alignment and damage to the nut, collet and tool holder could result. For ease of use I have purchased an ER- A clamping nut (https://www.sainsmart.
PAGE 7
If excessive vibration occurs when the spindle is turning a process of elimination can identify the cause. Remove the nut, collet and bit from the holder and try again. If the vibration persists check that the holder is straight and secure on the motor shaft, if it still persists then the motor itself is the suspect. Remove the bit from the collet and reattach the nut and collet into the holder and try again. If the vibration persists check the collet mounting into the nut.