SWISS-TYPE LATHE WORKHOLDING
How to Specify a Long-Nose Sub-Spindle Collet
A long-nose sub-spindle collet is normally produced by extending the front section of an existing standard collet. Correct identification therefore begins with the standard collet model, followed by extension length A, front-nose profile B, the gripping-bore specification and final overall length L.
DIMENSION REFERENCE
Which Dimensions Should Be Provided?
The reference below separates the unchanged standard collet body from the customized front extension. This makes it easier to confirm the correct machine interface before production.
Standard Collet Model
Provide the original model number, standard drawing or a confirmed sample. This identifies the body diameter, taper, clamping position and rear interface.
Extension Length
Dimension A is the added axial length at the front of the standard collet. It determines how far the nose reaches toward the workpiece.
Front-Nose Profile
Dimension B defines the outside size of the straight front section adjacent to the taper. It does not indicate the workpiece gripping bore.
Overall Length
Dimension L is the finished overall length from the extended front face to the rear end. It provides a final check against the requested extension.
START WITH THE STANDARD MODEL
Why the Base Collet Must Be Identified First
“Long nose” describes a customized front geometry, not a complete collet standard. Two collets can have the same bore and similar overall length while using different body diameters, tapers or spindle connections. A long-nose version must retain the mounting geometry required by the machine.
- Machine brand and exact model
- Main spindle or sub-spindle position
- Original collet number or standard dimensions
- Reference drawing, existing sample or clear photographs
- Required workpiece diameter and gripping profile
DRAWING CONFIRMATION
How We Record a Long-Nose Customization
To identify the component quickly and reduce drawing errors, we keep the standard collet reference and add a separate line for the customized front geometry.
Standard Collet Reference
Lists the original collet model and its standard interface dimensions. This confirms which existing collet family the customization is based on.
Customized Nose Dimensions
Lists extension length A, front-nose profile B, finished overall length L, the gripping-bore specification and any special gripping requirement.
Standard reference: Standard collet model and mounting dimensions
Customization: A = extension length / B = front-nose profile / L = overall length / bore = workpiece gripping size
Application: Machine model / sub-spindle / material / required quantity
TYPICAL APPLICATIONS
Why Use a Long-Nose Sub-Spindle Collet?
Extended Reach
The longer front section can reach a workpiece position that is inaccessible with the standard collet nose.
Part Pickup
On Swiss-type lathes, the sub-spindle may require extra reach to collect a finished or partially machined component securely.
Clearance Around Tooling
A customized nose can improve access when nearby tooling, shoulders or machine components limit the available space.
ORDERING CHECKLIST
Information to Send Before Production
Complete information allows the standard interface and customized front geometry to be checked together.
| Information | What to Provide | Why It Matters |
|---|---|---|
| Machine | Brand, exact model and spindle position | Confirms the intended installation location |
| Base collet | Model number, drawing or physical sample | Confirms taper, body and rear interface |
| Extension | Dimension A | Defines the additional front reach |
| Front profile | Dimension B, outside size/profile and tolerance | Defines the straight front nose adjacent to the taper |
| Gripping bore | Workpiece diameter/profile and tolerance | Confirms workpiece fit and gripping form |
| Overall length | Dimension L | Provides a final dimensional cross-check |
| Application | Workpiece material, gripping length and quantity | Supports material and gripping-surface selection |
You can also review our collet and guide bush model-number reference or browse Swiss-type lathe collets and guide bushes before sending your application details.
Need a Custom Long-Nose Sub-Spindle Collet?
Send the machine model, standard collet reference, extension length A, front-nose profile B, overall length L, gripping-bore specification, quantity and a drawing or sample for technical confirmation.