The Master Jaw System

This patented system from EDI Tooling Systems installs in less than five minutes to convert a CNC lathe chuck into a precision-length* collet system using readily available 5C collets.

ACCURACY:
The Master Jaw System is manufactured to exacting tolerances of less than .001 TIR. Users report typical installed runouts in the range of .0008 to .0015 TIR. This may vary depending on quality of collets used and condition of lathe chuck.

Experience has shown the system to be suitable for better than 95% of first operation work and better than 85% of second operation work.

The initial cost for the system is much lower than for other precision length collet systems. 5C collets are less costly than other collet types and are readily available through most tool supply outlets. Consider also the savings that result from being able to install and remove the Master Jaw System without the hassle of removing the chuck. The initial low cost and tremendous time savings over the life of the Master Jaw System make it an excellent and essential investment.

This ingenious system consists of a collet adapter which radially and axially locates the 5C collet and three jaws which actuate the collet. It is installed as quickly and easily as installing a set of top jaws! The chuck, draw tube, etc. remain on the machine and are not disturbed. In addition to tremendous time saving the system offers several other benefits:

• Elimination of the need to drill and bore soft jaws for small diameter parts. No more broken boring bars, tapered holes and wasted time!
• Quick changeover to different stock size and shapes; there is a 5C collet to cover round stock from sizes .0469 to 1.125, as well as hex, square, and metric sizes.
• Easy installation of collet stop for chucking work, or works equally well with bar feed or bar puller.
• Change back to soft jaws or hard jaws for larger diameter parts in five minutes or less.

Part #	Fits chuck model #
MJSK6LA	Kitagawa B-206
MJSH6LA	Howa HO37M6
MJSK8SA	Kitagawa B-08, HOH-08K, MMK HA6-8-46, H-8-46
MJSK8LA	Kitagawa B-208, MMK ZA6-8-52, Strong N208, PBA
MJSH8LA	Howa HO37M8
MJSH8SA	Howa HO27M8
MJSH10SA	Howa HO27M10
MJSK10SA	Kitagawa B-10, HOH10K
MJSK10LA	Kitagawa B-210, MMK ZA8-10-75, Strong N210, PBA
MJSH10LA	Howa HO37M10
MJSK8LA-16	Kitagawa B-208, MMK ZA6-8-52, Strong N208, PBA
MJSK10SA-16	Kitagawa B-10, HOH10K
MJSK10LA-16	Kitagawa B-208, MMK ZA6-8-52, Strong N208, PBA
The above list includes (but is not necessarily limited to) the chucks that our system can adapt to. Please give us a call if you do not see your particular chuck listed.