Collets

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Regular replacement of collets should be considered part of good machine maintenance as the condition of your collets will directly reflect upon the tool life as well as quality of finish on your product. Collets that are worn and dirty will create vibration during the cutting process.

CNC Machine Collets

Inspect your cutting tools to see if collet marks are visible on the shank. If so, that is an indication of vibration occurring during the cut and it is time to replace your collet. Although, the vibration can also stem from an imbalanced collet nut or tool holder.

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Did you know that in addition to the standard collets with a tolerance of 0.5 mm, GUHDO also offers Premium collets with a tolerance of 0.15 mm?!

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For more information see our webpage at http://www.guhdo.com/toolholders-collets-arbors/collets.php

Clamping Systems

Clamping Systems are a decisive link between a tool and the machine spindle. Tool life and attainable work piece quality, but also safety are significantly influenced by clamping systems.

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Ideally the clamping system should be:

  1. of low weight
  2. of low imbalance
  3. compliant with the norm
  4. made of high quality steel

 

Clamping technology assumes a key position with regard to machining quality and safety technology. Considering that the purchase of clamping systems is a matter of trust, it is recommendable to rely on products of well known manufacturers and to take detailed advise from sharp tooling experts!

For more information visit guhdo.com

Looking for ETS Style Collets for your CMS Machine?

BT 30 Collet Chuck

BT 30 Collet Chuck

ETS Style collets for CMS routers are becoming more difficult to find and are very expensive to buy.  We have BT30 and BT35 tool holders for both machine brands that take standard ER collets….a much lower cost collet to replace. These tool holders come with a ball bearing collet nut, so they can be run in LH or RH rotation.  Don’t want to replace the entire tool holder?  Then you can also convert to ER style collets by simply replacing the collet nut on your existing tool holder.  ER collets are generally about 1/3 the cost of an ETS collet and much easier to source.

BT 30 Tool Holder

BT 30 Tool Holder

Click here for more detailed information on the BT Tool Holders.

BT Tool Holder for Heian and Shoda CNC Machines

BT Tool Holder for CMS Machine

The Importance of Tool Holders in Precision Machining

GUHDO HSK63F Tool Holder, Collet, Collet Nut, Router Bit

GUHDO HSK63F Tool Holder, Collet, Collet Nut, Router Bit

The selection and proper use of the tool holder is almost as important as the actual cutting tool selection. The tool holder is the contact point between the machine and the tool itself so it’s integral to the integrity of the connection to the machine spindle. It’s essential that the tool is properly inserted within the collet and that it rotates through its cutting path with little to no run-out.  Ball bearing collet nuts help ensure the collet is clamping the tool properly in order to avoid loss of tool efficiency and any possible deflection from the clamping source.   Should you experience a run-out or machine crash one of the most important things to do is re-calibrate the spindle using a  run-out arbor.

The collet style tool holder used most frequently in woodworking is the HSK style tool holders,  made up of three main parts: the actual tool holder body, the collet and the collet nut.  In the case of ISO, SK and BT tool holders the retention knob (also referred to as a pull stud) is a fourth part.

HSK Tool Holder

When changing the tool it is important to setup the tooling in the proper tool changing fixture to properly secure the tool holder while installing/changing tooling .  A  torque wrench should be used to tighten the collet nut as over or under tightening can be dangerous to the machining operators, also having a negative effect on the tool and spindle due to slippage and chatter caused by a lack of uniform compression on the shaft.

HSK63F Tool Holder with Router Bit

When installing the tool shank into the collet, it is important that at least 3/4″ of the collet is filled with the tool shank to avoid imbalance, vibration, risk of tool slippage and even tool breakage. It’s important to ensure that the spirals/cutting edge is not covered by the collet as it can damage the edge. Improperly balanced tools will lead to a  poor material finish and paying close attention to accurate tool clamping increases the tool’s longevity, reduces noise from the machine and severely decreases the chances that spindle failure or damages will occur. In the case that this occurs don’t forget, calibration arbors are great tools to keep your spindle healthy after a move or tool crash.

HSK63F Tool Holder and Collet Nut