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PRECISION SPINDLES NUT OR AIRCYLINDER ACTUATION
Spindle/Headstock Spindle/Headstock
40 Tapered Nose Model 
Nut Actuation		 Plain Nose Model with Air Collet Actuator and Pulley

How Is It Used?

The highly accurate Dunham Tool Centric Spindle/Headstock line now includes five models to allow the creation of small polishing machines, special lathes and 5C collet equipment in the tool room or machine shop. Or they can simply be used as accurate inspection workheads on lathes or cylindrical grinders, or as aids in building new equipment.

Using inexpensive 5C collets, spindle capacities range from 1/18"quot; to 1 1/18" for OD holding, 3/4 " to 3" for step chuck 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 or Hardings step chucks up to 6" diameter). Spindles include a standard unit with nut closer for through work or a standard unit with quick-acting lever collet closer; additionally, the spindle/headstock assembly can include a Dunham Air collet Closer with vee or timing belt pulley.

In all modles, the precision preload ball bearing spindle is guaranteed within 0.00005" TIR.

Series 50M Spindles (Centric)
Part # Description
50MP-1 3600 rpm Plain Nose 50M Centric Spindle (does not include collet closing device)
50MT-2 3600 rpm 4 Degree Tapered Nose 50M Centric Spindle (does not include collet closing device)
50MMP-3 1200 rpm Plain Nose 50M Centric Spindle Motorized (does not include collet closing device)
50MMT-4 1200 rpm 4 Degree Tapered Nose 50M Centric Spindle Motorized (does not include collet closing device)
50MP-DACC 3600 rpm Plain Nose 50M Centric Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50MT-DACC 3600 rpm 4 Degree Tpaered Nose 50M Centric Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50MP-DACCOM 3600 rpm Plain Nose 50M Centric Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50MT-DACCOM 3600 rpm 4 Degree Tpaered Nose 50M Centric Spindle DACC-Air Closer, DT-14 Drawtube (requires pulley selection)
50M Spindles Accessories
3.5VPULYDACC 3.5 Pitch Vee Pulley fits both style spindles
28HB100D-SA Timing Belt Pulley 1/2" pitch, 1" wide belt, 28 groves, 4.456" flange diameter, fits both style spindles
28HB150D-SA Timing Belt Pulley 1/2" pitch, 1 1/2" wide belt, 28 groves, 4.456" flange diameter, fits both style spindles
MA338-M Mount for spindle/actuator assembly without pulley
50DLC Lever Collet Closer for Plain Nose 50M Centric Spindle
50DLCT Lever Collet Closer for 4 Degree 50M Centric Spindle
60CN Closing Nut for Plain Nose 50M Centric Spindle
50CNT Closing Nut for 4 degree 50M Centric Spindle
MB797 Keyway Option for 50M Centric Spindle Headstock
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