First remove any bit and unscrew the clamping nut completely from the holder. The collet now needs to be popped out of the retaining ring by pressing the collet over to the side (1) and then applying a push to pop it out (2).

ER11 Collet Set

Depending on the bits you use get the collets to fit them, if you frequently use 6mm bits then get a 6mm collet, if you often use 1/4” bits get a 1/4” collet, if you use both, get both.

The target audience here is a total novice using their first router. So if parts seem a little long winded to you then just skip the details.

ER11 Collets are described by the internal diameter. A 3mm collet is designed for a bit with a 3mm shank diameter. There is a bit of tolerance built in due to the clamping action so a 3mm collet should also take a 1/8” or 3.175mm shank. A 1/4” shank is 6.35mm so a 6mm or 7mm collet should work.

The drawback is that the size of the collet used must be matched to the diameter of the bit shank, but different sized collets are relatively cheap.

Feb 26, 2022 — the fit of the countersinks to each bit. Another factor to consider with straight bits is how clean the initial hole is. You might be thinking ...

ER 11COLLET dimensions

Above this is a retaining ring, this is very deliberately made wider at one side than the other. It’s not supposed to be concentric to the nut. This retaining ring fits into the groove of the collet. This holds the collet into the nut and also when you wish to remove a bit it forces the collet down out of the taper of the holder breaking any ‘cold welding’ which may have occurred and so releases the clamping round the bit allowing it to be removed easily.

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ER11 Collet 8mm

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Collets are also available in sets which can be cheaper and very useful if you also use drills. I use the SainSmart set.

The nut which secures the collet into the holder is an A type which means it has a hexagon nut on the outside, other styles are available which will require different spanners but the interior will be the same.

ER 11Collet holder

Locate the widest point of the retaining ring in the nut and engage the slot of the collet into it, while pushing it in to the nut (1) press it straight (2). After insertion check that the collet is straight and fully seated into the nut

er11 collet 1/4

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It will depend on where the direction of the sideways push is. It will be easiest to push out when you are lifting the collet slot over the narrowest point of the retaining ring on the nut as shown by the orange circle. As you cannot see where this is if it doesn’t pop out at the first attempt rotate it a bit and try again.

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ER11 Collet Nut

This is the ‘standard’ tool holder for small CNC routers. ER is the ‘name’ 11 means that it has an 11mm exterior collet diameter. The basic design goes back to 1973 and earlier.

At the base there is a bottom taper, this matches the taper angle of the bottom of the collet and ensures as it is tightened the collet is compressed evenly.

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.

Normally factory fitted onto the motor shaft as it should be 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.

ER 11Collet nut dimensions

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2017102 — The SFM calculation utilizes the industry standard of 3.82. Here, the cutter diameter of the chosen tool is multiplied by the speed or RPM. This ...

As the collets snap into the nuts to make my life easier I also have purchased separate nuts for each collet size I normally use See here This is not necessary but makes my life easier.

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.

Other sizes of collet are available using the same principles, these range from ER-8 to ER-50. These collets are NOT interchangeable being of different diameters.

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After mounting a bit, especially after changing the collet, manually rotate it and ensure the rotation of the tip of the bit is straight and true.

It has a tapered interior which matches the angle of the collet so that as the collet is forced into the holder the collet is compressed and clamps round the shank of the bit. A threaded area at the bottom to match the clamping nut and a couple of flats on the shaft allowing a spanner to be used to tighten and release.

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