Gibbs Machinery Co
21500 Hoover Rd
Warren
MI
48089-3160
Tel: 586-755-5353
Fax: 586-755-0304
sales@gibbsmachinery.com
www.gibbsmachinery.com
12"#GCY, National Broach Gear Shaver, Crowning Attachment, 9" Cutting Head,#5219
[5219]
EQUIPPED WITH:
Crowning Attachment 9" Cutter Head
Power Tailstock Traybon Lube System
Power Door Coolant System
RECONDITION SCHEDULE
Work Gear Pitch Dia. ....................................... 1" - 12"
Work Gear OD, Max. ......................................... 12 3/4"
Work Gear Diametral Pitch................................... 4 - 20
Cutter Size - 9" Head....................................... 7" - 9"
12" Head....................................... 7" - 12"
Cutter Speed 9" Head....................................... 71 - 281 rpm
12" Head....................................... 65 - 258 rpm
Table Speed Reciprocation................................... 1.34 - 13.89"min.
Distance Between Centers.................................... 23 5/8"
Crossed Axes Angle, Max. ................................... 25 deg.
Floor Space................................................. 41" x 55 3/4"
Height...................................................... 86 3/8"
Net Weight.................................................. 11,200 lbs.
The principal design innovations include a rearrangement of basic machine
elements to provide easier operation and faster machine changeover between
jobs.
CUTTER DOWN-FEED REPLACES KNEE UP-FEED:
Instead of the knee feeding the work upward into the cutter during the shaving
cycle, as in previous models, the cutter head of the GCY is fed downward into
the work mounted on a table which remains fixed in elevation. Thus, the
conventinal knee construction is eliminated and the height of the work centers
remains constant at about 45" above floor line.
This new arrangement has two principal advantages. It permits a lower table
height which, in turn, facilitates loading and unloading the work. For heavy
work parts, this is important.
Cutter down-feed brings all compressive stresses into conformity with the
action of gravity, to attain maximum stability throughout the system and
thereby improve precision capability.
QUICK JOB CHANGEOVER:
Several ideas have been incorporated to reduce changeover time from one job to
the next. A signigicant advantage in job-shop operations.
The cutter-head slide, in addition to its feed mechianism, is equipped with
power traverse for quicker positioning. This eliminates the former job of
hand-cranking the knee up or down when changing from one size gear to another.
Table reciprocation and cutter drives both operate through dial-set shift-type
transmissions, rather than by the slower alternative of change-gears.
A parallelogram linkage and sector gear mechanism permit quick traverse angle
setting without disturbing work table alignment.
The down-feed mechanism is simple and easy to set. It provides selectivity in
both increments of stock removal and in the number of table strokes of a cycle
FLEXIBILITY OF THE SHAVING CYCLE:
The character of the automatic down load mechanism provides considerable
flexibility in the shaving cycle:
* The value of feed increments is selective and ranges from .0005" upward.
* Value of increments used in a cycle need not be uniform.
* Dwell strokes may be introduced at will.
Thus, a cycle might consist of a series of progressively lighter cuts,
followed by one or more dwells. This is all controlled by positioning switch
dogs on a master dial. No special cams are needed. If the same feed cycle is
permissible on successive work gears having differant diameters and tooth
characteristics, changeover requires merely a repositioning of the master dial
THREE OPTIONAL SHAVING METHODS:
The user has a choice of three distinctly differant shaving methods:
* Axial Traverse (Conventional)
* Angular Traverse (Diagonal)
* Right Angle Traverse (Tangential)
CROWNING:
Standard constant tooth thickness shaving cutters are used to crown-shave or
taper-shave gear teeth by either the Axial Traverse or Angular Traverse
methods of shaving. Crowning is accomplished by rocking the table which
progressively increases cutter feed toward the ends of the teeth. by either
method (Axial or Angular Traverse), the table is rocked in the plane of the
work axis - NOT in the diagonal plane of Table Traverse Teeth may be taper-
shaved and crowned simultaneously.
TUNNEL-TYPE COLUMN:
The new column is a sturdy integral casting which adequately assures desired
overall rigidity. As a column, it also provides maximum compatibility with
all types of loaders, used in automated installations.
SAFETY FEATURES:
Overtravel of the work table is prevented in case the table reversing switch
happens to fail. This is accomplished by a safety switch which, after setting,
needs no readjustment even though alterations are made in the length of table
stroke. The cutter is likewise protected by a backup safety switch for the
cutter head slide in the event of a failure of the down feed limit switch.
POWER UNITS:
Two motors are located in the head. One is used to drive the cutter, the other
serves the feed and power traverse mechanism. One of two motors in the base
of the machine powers table reciprocation. The other serves the coolant and
lubricant systems.
RED RING ROTARY GEAR SHAVING PRINCIPLE:
The work gear is rotated in close mesh with and in a crossed axes relationship
with a gashed-tooth cutting tool in the form of a helical gear. The cutter
being uppermost, permits the chips to fall clear of the cutting contacts. It
also prevents cutter damage if the work gear is accidentally dropped while
being loaded.
With the work gear driven by the cutter, the former is reciprocated across the
face of the latter and the direction of rotation reversed at the end of each
pass. The angle between the work gear axis and the direction of reciprocation
or traverse varies with the shaving method. Center distance between cutter
and work may or may not be reduced at each table stroke, depending on the
shaving method.
This Machine Was Purchased From National Broach (Natchi) On 10-29-01-
The Machine Was in the Lab for Experimentation of Differant Controls
It is for All Practical Purposes a New Machine.
Picture Shows an Experimental Control. It is Now Being Converted to Standard
Controls.
UED-ed is published by
Used Equipment Directory
45 Eisenhower Dr 5th Fl, Paramus NJ 07652
Robert Scofield, Publisher. Email: bobs@buyused.com,
Tel: 201-845-2452 Fax: 201-845-2496
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