new  Pg.  345 PRENTISS TOOL & SUPPLY COMPANY.

CUTTER AND TOOL GRINDERS

MOTOR DRIVEN

 

 

PRENTISS TOOL & SUPPLY COMPANY.

 

 

CUTTER AND TOOL GRINDERS

MOTOR DRIVEN

This is, in every respect a complete toolroom grinder. We can supply it complete with motors as illustrated, or, when preferred, we can omit the motors and supply countershafts in their stead.

The motor driven machine is entirely self-contained, there being no overhead works whatever, and the main motor is mounted on an extension which is cast to and forms part of the base. This motor drives

—   at constant speed to the machine, the four speeds of the spindle being obtained by means of the cone pulleys on the machine. A small variable speed motor, en­closed type, direct current, especially adapted to this machine, is mounted directly on the swiveling head for revolving the work between centers, for cylindrical grinding; and also for internal grinding. The starting boxes for both motors are mounted on front of the machine within convenient reach of the operator. It is compact, and requires very little more floor space than the countershaft-driven machine.

The countershaft driven machine is supplied with

one countershaft with tight and loose pulleys driving direct to the machine with a constant speed belt. The four different emery-wheel speeds are obtained b means of the cone pulleys on the machine. From this same countershaft we drive a six-speed variable speed drum countershaft (permitting of in stantaneous speed changing while running) for revolving work be­tween centers, from which it will be seen that the entire grinder is driven by a single belt from the line shaft.

This machine is designed to meet all toolroom re­quirements. It is constructed especially with a view to meeting the demand for a substantial grinder for sharpening the large spiral mills and face mills that are in general use on large milling machines. This no wise affects its thorough adaptability for sharpening

the smallest cutters and reamers in common use. It                                                                                         No. 2. will handle the same great variety of work as the

No. i grinder.

In addition to this it is also thoroughly adapted for a general line of cylindrical, surface, internal aO(l (liSk grinding, and its design has been carried out with a view to satisfactorily handling such work. The automatic fee(l will cover cylindrical work 24 inches long, and will surface grind pieces 7 inches wide x 24 inches long, and also applies to all sorts of internal and disk grinding. It is built of very liberal proportions, giving it the necessary stiffness for grinding large cutters quickly and accurately. It is designed to give the utmost convenience in operation, and all bearing surfaces are large and are fully covered, so as to be thoroughly protected from dust.

Spiral mills and similar cutters are held between centers for the gjrinching. operations. These centers are mounted directly on the table, and the work is traversed past the emery wheel by means of the automatic feed actuating the slide. Such work is not slipped along a mandrel by hand, as is the case on many grin(lers. It will be seen from the following illustration that it is designed to do all sharpening with a cup-shaped wheel.

End mills are ground upon their own shanks, the large No. 12 taper hole in the swiveling head and the collets provided being suitable for holding shanks of any of the sizes in common use. Large face-milling cutters are held in a similar manner, and on both end-mills and face-mills all the grinding can be done without rechucking the cutter. To bring such work, as well as all sorts of angular work into convenient position with relation to the emery wheels the emery-wheel beach may be swiveled on the column and securely clamped in any position, there being a large base and graduated dial provided for this purpose. In this manner the work to be ground can be brought into any position whatever in relation to the emery wheels just as conveniently as it is done on our smaller grinder.

The table may be swiveled about a fixed center and set at convenient angles for grinding taper work, there being a graduated dial reading in degrees, and also a graduated scale from which the taper in inches per foot up to 2 inches may be read direct.

The vertical adjustment is provided with a micrometer arrangement to facilitate securing the exact adjustment required to give the proper clearance when sharpening reamed, milling cutters, etc.

The traverse motion of the table is also provided with a micrometer dial.

The automatic table feed is controlled from the front of the machine, and is arranged so that a change from a fast feed for roughing cut, to a slow feed for finishing, can be made in an instant and without stopping the machine. The adjustable dogs for tripping and reversing the feed are provided with a micrometer adjustment.

The internal grinding attachment is mounted oil the emery-wheel beach ouch is driven by a pulley on one eiid of the spindle. On the other end of the spindle a suitable wheel for disc grinding can be mounted at the same time. After the grinding of the hole has been Finished. the emery-wheel head may be swiveled through 90 degrees, into position for grinding the face of the work, which can be done at the same setting, without rechucking. When doing internal grinding, the work may be run clear of the attachment so as to give room for trying the plug or calipering, without disturbing the setting or moving the feed tripping clogs. This is made possible by the special construction of the trip pin on the reverse lever, permitting its instant withdrawal a sufficient amount to let the dogs pass.

 

SPECIFICATIONS.

 

Centers. Swing 12 inches diameter; take .36 inches in length.                                               Surface Grinding. It will take work 7 inches x 24 inches on Automatic Feed. 24 inches; 8 changes of feed for each table.

spindle speed, ranging from 8’ 2 inches to 65’ 2 inches per minute.          Swivel Vise. Has jaws 4 inches wide, i~Th inches cheep; Swivel Head. Has No. 12 B. & S. taper hole for holding opening, ~ inches.

  cutters on their own shanks for grinding. Will take face and                                                 Internal Grinding             Attachment. Will finish holes 34 inch
  side-milling cutters up to
24 inches diameter, 3-inch face, grinding                                      diameter ouch larger by 3 inches deep. It has four speeds, from

three sides of blades without rechucking.                                                                           7900 revohtmtions per minute to 19,000 revolutioiis per minute.

Spindle. Tool steel; rtmns in phosphor bronze boxes adjust-                                               Internal grinding can also be done by extension on main spindle. able for wear. It will grind holes “2 inch diameter and larger by ~ inches deep.

Spindle Speeds. 4 in number:                    i8oo, 2300, 3100 and 4300

revolutions per minute.

Table. 46 inches long. Has a Is-inch T-slot, and swivels                                                                                          CODE WORDS.

about a fixed center; has graduated arc reading in degrees, and                                                   Belt driven, . . . . . . . Bang scale at end reading up to 2 inch taper per foot. It can be lowered

12 inches below center of emery-wheel spindle.                                                                         Electric driven, . . . . . . Elecbang

 

 

 

 

 

 

p page seen below as scanned in OCRC

 

 

This is, in every respect a complete tool room grinder. We can supply it complete with motors as illustrated, or, when preferred, we can omit the motors and supply countershafts in their stead.

The motor driven machine is entirely self-contained there being no overhead works whatever, and the main motor is mounted On an exteiision which is cast to and forms part of the base. This motor drives at constant speed to the machine, the four speeds of the spindle being obtained by means of the cone pulleys on. thc machine. A small variable speed motor, en­closed type, direct current, especially adapted to this machine, is mounted directly on the swiveling head for revolving the work between centers, for cylindrical grinding; and also for internal grinding. The starting boxes for both motors are mounted oil front of the machine within convenient reach of the operator. It is compact, and requires very little more floor space than the countershaft—driven machine.

The countershaft driven machine is supplied with one countershaft with tight and loose pulleys driving direct to the machine with a constant speed belt. The four different emery-wheel speeds are obtained by means of the cone pulleys on the machine. From this same countershaft we thrive a six-speed variable speed drum countershaft. (permitting of instantaiicous

 

Speed changing while running) for revolving work be­tween centers, from which it will be seen that the entire grinder is driven by a single belt from the line she ft.

This machine is designed to meet all tool room re­quirements. It is constructed especially with a view to meeting the demand for a substantial grinder for sharpening the large spiral mills and face mills that are in general use oh large milling machines. This no wise affects its thorough adaptability for sharpening the smallest cutters and reamers in common use. It

 

Will handle the same great variety of work as the

No. grinder.

In addition to this it is also thoroughly adapted for a general line of cylindrical, surface, internal and disk grinding, and its design has been carried out with a view to satisfactorily handling such work. The automatic feed will cover cylindrical work 24 inches long, and will surface grind pieces 7 inches wide x 24 inches long, and also applies to all sorts of internal and disk grinding. It is built of very liberal proportions, giving it the necessary stiffness for grinding large cutters quickly and accurately. It is designed to give the utmost convenience in operation, and all bearing surfaces are large and are fully covered, so as to be thoroughly protected from dust.

Spiral mills and similar cutters are held between centers for the grinding. Operations. These centers are mounted directly Oil the table, and the work is traversed past the emery wheel by means of tile automatic feed actuating the slide. Stich work is not slipped along a mandrel by hand, as is the case on cmany grinders. It will be seen from the following illustration that it is designed to do all sharpening with a cup-shaped wheel.

End mills are ground upon their own shanks, the large No. 12 taper hole in the swiveling head and the collets provided being suitable for holding shanks of any of the sizes in common use. Large face-milling cutters are held in a similar manner, and on both end-mills and face-mills all the grinding can be done without rechucking the cutter. To bring such work, as well as all sorts of angular work into convenient position with relation to the emery wheels tile emery-wheel heath may be swiveled on tile column and securely clamped in any position, there being a large base and graduated dial provided for this purpose. In this manner the work to be ground can be brought into any position whatever in relation to the emery wheels Just as conveniently as it is done on our smaller grinder.

The table may be swiveled about a fixed center and set at convenient angles for grinding taper work, there being a graduated dial reading in degrees, and also a graduated scale from which the taper in inches per foot tip to  inches may be read direct.

The vertical adjustment is provided with a micrometer arrangen-ient to facilitate sectiring the exact adjustment required to give the proper clearance when sharpening reamers, milling cutters, etc.

The traverse motion of the table is also provided with a micrometer dial.

The automatic table feed is controlled from the front of the machine, and is arranged so that a change from a fast feed for roughing cut, to a slow feed for finishing, can be made in an instant and without stopping tile machine. The adjustable dogs for tripping and reversing the feed are provided with a micrometer adjustment.

The internal grinding attachment is mounted Oil the emery—wheel head and is driven by a pulley on one end of the spindle. On tile other end of the spindle a suitable wheel for chi~c grinding can be mounted at the same time. After the grinding of the hole has been flnished, the emery-wheel head may be swiveled through 90 degrees, into position for grintliiig tile face of the work, which can he done at the same setting, without rechucking. When doing internal grin(ling, the work may be run clear of tile attachment so as to give room for trying the plug or calipering, without disturbing the setting or moving the feed tripping dogs. This is made possible be the special construction of the trip pill on the reverse lever, permitting its instant withdrawal a sufficient amount to let the dogs pass.

 

SPECIFICATIONS.

 

Centers.

     Swing 12 inches diameter; take 36 inches in length.

Automatic Feed.                                                                                                                

    24 inches; 8 changes of feed for each spindle speed, ranging from 8’2 inches to 65’ 2 inches per miilute.                  

       Swivel head.

            Has No. 12 B. & S. taper hole for hloldiilg  cutters on their own shanks for grinding.

            Will take face and cutters up to 24 inches diameter, 3-inch face, grinding diameter groinding three

            sides of blades without rechucking.                                                                                                                       larger by 3 ,3’~ inches               deep.

Spindle.

    Tool steel; runs in phosphor bronze boxes adjtistable for wear.

Spindle Speeds.

   4 in number:   t8oo, 2300, 3100 and 4300 7900 revolutions per minute to 19,000 revolutions per minute.

           revolutions per minute.

Table.

    46 inches long. Has a 58-inch T-slot, and swivels about a fixed center;

     has graduated arc reading in degrees, and . . . .

            scale at end reading tip to 2 inch taper per foot. It can be lowered 12 inches below center of

            emery wheel spindle.

     Surface Grinding.

        It will take work 7 inches x 24 inches on table.

      Swivel Vise.

          Has jaws 4 inches wide. l ¾ inches deep. It has footer ~ inches sleep Internal Grinding Attachment.

 Will finish holes ¾ inch side-milling

Internal grinding can also be done by extension on main spindle.

 for wear. It will grind holes 112 inch diameter and larger by 5 inches able