A collet is like a chuck in that it applies clamping force around a tool, holding it in place. The difference is that the clamping force is applied evenly by forming a collar around the tool shank. The collet has slits cut through the body forming flexures. As the collet is tightened, the tapered spring design compresses the flexure sleeve, gripping the shaft of the tool. The even compression provides an equal distribution of clamping force resulting in a repeatable, self-centered tool with less runout. Collets also have less inertia resulting in higher speeds and more accurate milling. They provide a true center and eliminate the need for a sidelock holder that pushes the tool to the side of the bore resulting in an unbalanced condition.
There are two types of collets, workholding and toolholding. RedLine Tools provides a selection of toolholding collets and accessories such as Rego-Fix ER, Kennametal TG, Bilz tap collets, Schunk hydraulic sleeves and coolant sleeves.
Recommended torque values:
TG or Tremendous Grip collets were developed by
the Erickson Tool Company. They have a 4 degree taper which is much less than
ER collets that have an 8 degree taper. For that reason, the grip force of TG
collets is larger than ER collets. TG collets also have a much longer grip length resulting in a larger surface to grip with. On the
flip side, they are more limited in the range of
shank collapsibility. Meaning you may have to purchase more collets than you
would ER collets, to work with your range of tools.
Because TG collets grip carbide tooling much
tighter than ER collets, they are ideal for end milling, drilling, tapping,
reaming, and boring. RedLine Tools
offers the two different sizes; TG100 and TG150.
Recommended torque values:
Quick-Change tapcollets are for synchronous tapping systems using a Rigid tap holder or tension & compression tap holders that allow you to change and secure taps in seconds. The tap fits on the square and is held securely by the locking mechanism. The collet bore is measured to the tool diameter, with square drive for accuracy. By using Bilz Quick-Change tap collets, the time to change out taps is greatly reduced. On transfer lines and special application machines, cost savings can be significant.
Intermediate sleeves, or hydraulic sleeves, utilize hydraulic pressure supplied by a hydraulic chuck to collapse the sleeve around the shank of the tool. They extend the available tool shank diameters from 3MM to 25MM for a single hydraulic tool holder. They tend to control runout better than collet chucks and offer vibration-dampening characteristics to improve tool life and part finish. The real benefit is their slim design, which allows more clearance around parts and fixtures than collet chucks or mechanical milling chucks.
Coolant seals prevent the loss of coolant and pressure on tools and holders with inner coolant passages such as drills, end mills, taps, reamers and collet chucks. By applying maximum coolant pressure directly on the cutting tip, higher speeds & feeds and longer tool life can easily be attained. No special wrenches or hardware are needed to install. Installation is quick and easy allowing for zero down time. Once the seal is installed you will notice the constant pressure that is emitted. Your tools will perform at peak performance with no adverse effect on accuracy or clamping ability.