Precision Vises - Workholding.net

Precision Spindle Headstock
Dunham Tool

M Precision Spindle Headstocks

Features and Benefits

Dunham Tool manufactures precision spindle headstocks which are available as complete spindle headstock assemblies and can be equipped with collet actuators or chuck actuators and pulleys as optional attachments. Dunham Tool's 50m precision spindle headstock assemblies can be used with a variety of standard and special workholding fixtures, and Dunham Tool will provide the spindle adapter to accommodate your workholding specification. The 50m precision spindle is designed to accept and actuate 5c collets directly. These spindles will also accept 1c collet, 3c collet and r8 collet sizes and manual collet actuators. Our precision spindles are designed for use in and on a variety of mounting platforms, either horizontal or vertical.

The highly accurate Dunham Tool centric precision spindle headstock line now includes models to allow the creation of small polishing machines, special lathes and 5c collet, 1c collet and 3c collet equipment in the tool room or machine shop. They can also be used as accurate inspection heads, lathes or grinders, or as aids in building new equipment.

Using a 5c collet, 1c collet, or 3c collet, precision spindle capacities range from 1/64" to 1 1/16" for OD holding, 3/4" to 6" for step chucks OD holding and 1/4" to 6" for ID holding with expanding collets.

Each model is available with either plain nose or 4⁰ taper nose (which accepts closing rings for Hardinge step chucks up to 6" diameter). Precision spindle headstock assemblies include a standard unit with nut closer for through work or a standard unit with quick-acting lever collet closer. Additionally, the precision spindle headstock can include a Dunham Tool air collet closer with vee or timing belt pulley.

In all models, the pre-loaded ball bearing spindle is guaranteed within 0.00005" TIR.

Unit can be bench mounted, used to replace worn workheads on lathes or grinders or for building new equipment.
Pre-loaded ball bearing precision spindle with 0.000050" TIR accuracy.
Rugged 28 pound gray iron body with crackle paint finish.
Uses all 1c, 3c or 5c collets.
Taper nose model accepts step chucks to 6" diameter, 3-4-6 jaw chucks.
Air collet closer has 1 1/16" clearance through drawtube, provides balanced gripping pressure (adjustable) even with .005" part diameter variations.

roduct Drawings for 50M Precision Spindle Headstocks
Choose either the GIF format to open in your browser or .dxf format which is in a self-extracting zip file. After downloading the file to a directory of your choice double click the .exe file and the .dxf files will be available for viewing in your CAD program. Refer to text file for the index of drawing listings.
50MT-2 Centric (4 degree taper nose) gif format 50MP-1 Centric (plain nose) gif format 50MT-2 Centric (taper nose) w/DACC, DS100, 3.5 PD V-pulley gif format 50MT-2 Centric (taper nose) w/DACC, DS100, adapter, & 28HB100 gif format 50 MP-1 Centric (plain nose) w/DACC, DS100, 3.5 PD V-pulley gif format 50MP-1 Centric (plain nose) w/DACC, DS100, adapter, & 28HB100 gif format

0M Precision Spindle Headstocks

Series 50M Precision Spindles (Centric)
Part #	Description
50MP-1	3600 rpm Plain Nose 50M Centric Precision Spindle (does not include collet closing device)
50MT-2	3600 rpm 4 Degree Tapered Nose 50M Centric Precision Spindle (does not include collet closing device)
50MMP-3	1200 rpm Plain Nose 50M Centric Precision Spindle Motorized (does not include collet closing device)
50MMT-4	1200 rpm 4 Degree Tapered Nose 50M Centric Precision Spindle Motorized (does not include collet closing device)
50MP-DACC	3600 rpm Plain Nose 50M Centric Precision Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50MT-DACC	3600 rpm 4 Degree Tapered Nose 50M Centric Precision Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50MP-DACCOM	3600 rpm Plain Nose 50M Centric Precision Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50MT-DACCOM	3600 rpm 4 Degree Tapered Nose 50M Centric Precision Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50M Precision Spindles Accessories
3.5VPULYDACC	3.5 Pitch Vee Pulley fits both style Precision spindles
28HB100D-SA	Timing Belt Pulley 1/2" pitch, 1" wide belt, 28 groves, 4.456" flange diameter, fits both style Precision spindles
28HB150D-SA	Timing Belt Pulley 1/2" pitch, 1 1/2" wide belt, 28 groves, 4.456" flange diameter, fits both style Precision spindles
MA338-M	Mount for precision spindle / actuator assembly without pulley

50DLC	Lever Collet Closer for Plain Nose 50M Centric Precision Spindles
50DLCT	Lever Collet Closer for 4 Degree 50M Centric Precision Spindles
50CN	Closing Nut for Plain Nose 50M Centric Precision Spindles
50CNT	Closing Nut for 4 degree 50M Centric Precision Spindles
MB797	Keyway Option for 50M Centric Precision Spindle Headstock