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Cautions for Installing Hydraulic Collet Chucks

Release date:

2025-11-13

Uniting the strength of machinery to embark on a journey of progress

What exactly are the principles for selecting CNC tool holders?

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Backhand tool holder: Anti-interference in deep hole machining

The pullback toolholder solves the problems of loosening and precision issues in traditional toolholders with its mechanical anti-loosening structure and ultra-precision manufacturing, making it particularly suitable for deep cavity machining and high-speed precision milling.

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Uniting the strength of machinery to embark on a journey of progress

Summary description)Uniting the strength of machinery to embark on a journey of progress

Cautions for Installing Hydraulic Collet Chucks

What exactly are the principles for selecting CNC tool holders?

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Prohibited Content		Explanation
Mistake	The handle of the clamped tool and the inner bore of the tool holder were not thoroughly cleaned before inserting the blade.		When the hydraulic tool holder clamps down, there is significant pressure between the inner wall of the holder and the tool itself. Even the tiniest residual particles can lead to damage on the inner wall of the holder, potentially causing issues such as difficulty removing the tool, loss of precision, or even tool drop-offs. The presence of oil contamination can reduce the clamping force of hydraulic tool holders by more than 50%.
Correct	Clean the tool handle and the inner bore of the chuck, using an organic solvent to remove oil contamination from both the handle and the inner bore.
Mistake	Directly clamping incomplete tools by their shanks.		Clamping the hydraulic tool holder into the inner bore forces it into the notched section of the tool shank, making it difficult to remove the tool. In severe cases, this can even lead to plastic deformation of the inner bore, rendering the tool irretrievable or causing a loss of precision and ultimately leading to its disposal.
Correct	Clamp cylindrical-shank tools with a complete handle, or use a reducing sleeve to hold tools with an incomplete handle.		The tapered sleeve provides a certain level of protection for the tool holder, thereby preventing the issues mentioned above.
Mistake	Clamping the tool handle beyond the tolerance range.		For diameters less than 6 mm, the shank tolerance is H5. For diameters equal to or greater than 6 mm, the shank tolerance is H6. If the tool shank dimensions fall below the lower tolerance limit, it can easily lead to tool drop-offs, resulting in tool damage or scrapped workpieces. Conversely, if the shank dimensions exceed the upper tolerance limit, it may cause difficulties when removing the tool from its holder, potentially shortening the tool holder's service life.
Correct	A tool with its shank held within the tolerance range.
Mistake	The cutting tool touches the bottom of the inner bore of the handle.		Without the installation of the axial adjustment screw, when mounting the tool, contact the cutting edge with the bottom of the tool holder. The slight deformation that occurs as the tool holder is tightened can compromise the precision of the clamped tool, ultimately reducing tool life and leading to defective parts during machining.
Correct	Maintain a gap between the tool and the bottom of the tool holder's inner bore.
Mistake	The tool clamping length does not exceed the minimum clamping length.		Without the installation of the axial adjustment screw, when mounting the tool, contact the cutting edge with the bottom of the tool holder. The slight deformation that occurs as the tool holder is tightened can compromise the precision of the clamped tool, ultimately reducing tool life and leading to defective parts during machining.
Correct	The tool clamping length exceeds the minimum gripping length. The minimum gripping length is usually clearly marked on the tool holder.
Mistake	The tool coating is partially inserted into the handle.		After the tool coating is inserted into the tool holder, the compressive stress generated when the holder is tightened can cause the coating on the shank to peel off. Once peeled, the coating may damage the inner bore of the tool holder, ultimately reducing its service life.
Correct	The knife handle is inserted only into the uncoated tang.
Mistake	When performing heavy cuts or continuous machining, the tool holder is not continuously cooled.		The optimal operating temperature for the knife handle is 20°C to 50°C, with a maximum limit of 80°C and a minimum of 10°C. Excessively high temperatures can cause the internal pressure within the hydraulic tool holder to exceed its designed maximum, potentially even leading to cracking of the holder. Conversely, excessively low temperatures may result in insufficient internal pressure, preventing the tool holder from securely clamping the cutting tool effectively.
Correct	When machining with large material removal rates or during continuous cutting, ensure adequate cutting fluid or compressed air is used to continuously and directly cool the hydraulic tool holder clamping area, preventing overheating during operation.
Mistake	Tighten the compression screw when no tool is inserted; never operate under air pressure alone.	Tightening the compression screw—also known as air pressure—when no tool is inserted can lead to severe, irreparable damage, such as excessive deformation of the tool holder’s inner bore and subsequent hydraulic leakage.
Correct	Continue using this tool holder even if the tightening torque of the compression screw exceeds the recommended limit.
Mistake	Continue using this tool holder even if the tightening torque of the compression screw exceeds the recommended limit.	When the compression screw is tightened, continuous squeezing and friction occur between the tooth surfaces. Without adequate lubrication or cleaning, this can lead to tooth decay or even damage to the screw, making it impossible to remove. Especially when there are many clamping cycles, high operating temperatures, or abrasive dirt or chips present. To ensure optimal lubrication of the press screws, we recommend using molybdenum disulfide lubricant containing copper powder.
Correct	After cleaning or re-lubricating the pressurized screw, use the hydraulic tool holder again.
Mistake	The clamping force was not tested before use—simply installed and put into operation.	When the hydraulic tool holder is left unused for an extended period, the internal hydraulic system may require re-lubrication, leading to a reduction in the internal hydraulic fluid. Meanwhile, even when the compression screw is tightened, there will inevitably be a minuscule amount of leakage. Re-check the clamping force in the following three scenarios: When using for the first time Used more than 100 times Verify at least once every three months
Correct	Perform a clamping force test before use, and only proceed with machine operation if the test is合格 (qualified).