"

MECHANICAL PRESS BRAKES

SERIES

TONS CAPACITY

TONS CAPACITY

90 TONS CAPACITY

TONS CAPACITY

STERLING MACHINERY EXCHANGE .. . the four with more! 9310 GARVEY AVE SOUTH EL MONTEJ CA 91733 BULLETIN CR-565

DREIS & KRUMP MANUFACTURING CO. 7400 SOUTH LOOMIS BOULEVARD CHICAGO, ILLINOIS, 60636, U.S.A.

DREIS & KRUMP-IZNA, S.A. MONTERREY, N.L., MEXICO

c L

R

j

.. . the four with more!

WHAT ,SHOULD YOU LOOK FOR WHEN YOU INVEST IN A PRESS BRAKE?

Dreis & Krump proudly offer the Series C, L, M and R CI-IICAGO Mechanical Press Brake lines for intermediate range work. We call them TH 4 WITH MORE. These machines provide maximum production of shcet metal and plate work at modest cost. Each embodies the most advanced design, backed by almost 50 years of Dreis & Krump ingenuity and experience in press brake construction. Series C, L, M and R press brakes bring you the ultimate in easy operation, reduced maintenance, smooth, quiet functioning, and unfailing accuracy. On both produetion and jobbing work, you gain the added economy of using the ideal machine for a panicular range of work, instead of slower machines of hcavier capacity. All these machines are similar in design and construction-the C's and L's long known for unexeelled performance throughout industry the M's and R's now bigger, heavier, incorporating higher tonnage capacities. With grcater tonnage, extra dcsign features, an expanded line of optional features, and a history of standout p{~rformance in hundreds of plant installations, Series C, L, M and R CI-IICACO Press Brakes merit your serious consideration. Remember, they're THE 4 WITH MOREmore advan tagcs for you!

2

c R

THE 4 WITH MORE

STANDARD FEATURES ENCL-O-P WRD IVE

EXCLUSIVE STANDARD EQUIPMENT AT NO EXTIRA COSTI

THE MOST EXCITING CONCEPT IN MODERN PRESS BRAKE TECHNOLOGY This is the heart of Series C, L, M and R power-packed performance-exclusive dual EnclO-Powr Drive available only from Dreis & Krump. Encl-O-Powr Drive brings together all ram-drive members into two contained units-one at each end of the press brake. Each unit is, iu effect, a sealed reservoir of power completely lubricated to permit transmission of friction-free drive throughout the entire power train for each complete ram cycle. This exclusive CHICACO Press Brake design is shown beiow in the phantom view of the right end mechanism of a Series C, L, M and R maehine. Note the unique double reduction gearing featuring high-speed herringbone gears, the one-piece eceentric and gear strap, and the heavy-duty plunger-all fully enelosed and running in an oil bath. All side-thrust in the knuckle connection between the eccentrie and the plunger is completely absorbed within the End-O-Powr housing and crown, transmitting only vertical power directly to the ram. The highly polished plunger slides directly up-and-down within the close-tolerance bronze sleeve, exerting maximum force within the rated tonnage eapaeity of the machine. Results: smooth power delivery, less wear, lower maintenance, and fasrer, more accurate bending.

STRENGTH AND ACCURACY WHERE YOU NEED THEM ... WHERE THEY COUNT!

THE 4 WITH MORE

STANDARD FEATURES continued

All Steel Construction The frame of balanced design is of all-welded, rolled steel plate construction with deep, box-type crown assuring utmost rigidity and permanent alignment while maintaining a fully streamlined appearanee. All machining on the frame is done on the eompleted weldment. There are no bolted conneetions to loosen and cause frame weaving. Machine is shipped in one piece, ready for immediate use.

Deep Section Bed and Ram Both bed and ram are made of solid one-piece rolled steel plate with extra depth and eross-sectional proportions to insure minimum defleetion when operating under the full load capacities. The bed is welded to the frame. No special foundation is required as bed is abovc floor level in all sizes.

Inboard Ram. Drive Proved through many years of rugged service on CHICAGO Press Brakes-and typical of the design long used by manufacturers of heavy-duty meehanieal presses where severe service is required-the complete eeeeutric gear drive at either end of Series C, L, M and R press brakes is mounted inside the end frame of the machine. A contoured crown with heavy cross bracing, betweeu one-piece side frames all welded as an integral unit, provides maximum rigidity and alignment of the drive housings. Inboard drive construction permits employment of full-width bearing areas in both pitmans, plus added support from inboard and outboard bearing. Distance between points of load application is decreased, thereby increasing ram stiffness. This in turn reduces deflection, even under extreme on- or off-center load conditions.

CH'ICAGO In,board Ram Drive assures

MAXIMUMRIGI,OllY

U'ndesirob'le Wide-Set Rom Drive results in

DEFLECTION

... ...

CHICAGO ASSURES YOU THIS

ACCURATE PARALLEL ALIGNMENT

NOT THIS

PERMANENT MIS-ALIGNMENT

Accuracy Starts with the Deep Section Bed and Ram Deflection of the bed and ram members of CHICAGO Press Brakes is among the lowest in the industry. This is achieved through the use of a single deep sectioned plate for eaeh member. Both the bed and ram are machined as straight and flat as modern precision machine tools will allow, providing accurate aligument between bed aud ram, housing gibs, die holder mouuting, and tools.

Compcnsatiou for normal deflection is provided through use of a removable precision crowned dic holder. Adequate for obtaining straight bends under average loading conditions, it may also be shimmed to allow for a chauging pattern of deflection caused by varying load conditions.

A removable crown, as opposed to a permanent type crown, is particularly useful when punching or notching. With the close tolerances clemanded between pierce punch and die on mallY light gauge metals, simply removing the precision crowued die holder provides a flat bed surface on which to mount tooling. This helps maintain the needed base parallelism between bed, ram and tools.

Schematic shows rigidity of CHICAGO rams due to c1oseset inboard Also, when attaching angles on bed and ram for a wide-area,ram drive. Ram stiffness increases inversely as the cube of dis tance between points of load application. Thus. deflection can occur flat mounting surface, there is no need to compensate for a in other press brakes having wide-set load points. permanent crown in the bed or ram.

4

IDEAL APPLICATION AND CONTROL OF ENGINEERED POWER!

Double Reduction Gearing and Twin Drive Double reduetion gearing is a feature usually found only in heavier capacity press brakes. High speed g-earing is of thc herringbone type for quiet operatioo and more efficient drive. Thc twin dri"e, which consists of two eccentric gears rotating on fixed, alloy steel pi ns, assures equal application of power over the full length of the ram. Multiple V-belt to flywheel is standard equipment. Drivc motor is standard on Series C and L press brakes-ean be purchased separately for Series M and R. Flywheel and drive shaft arc mountcd on selfaligning antifrietion bearings.

Reversing control permits reversing the motor and ram in the event of jamming or sticking due to improper ram adjustmen r.

Powerful Friction Clutch and Flywheel AsseIDbly A heavy-duty disc-type frietion e1utch is mounted on the drive shaft for effieient drive and sensitive eontrol of the strong, perfeetly balanced flywheel, This clutch is sensitive and can be slipped or inched at any point of the stroke of the ram. Clutch is easily adjusted without removing guards, and maintenanee is virtually nil. Heavy, large diameter flywheel has ample energy for handling any work within rated eapaeity of lhe machine.

Standard disc-type friction clutch is mounted on drive shaft. It is easily adjusted from the outside. Drive is by multiple V-belt to flywheel.

Spring -Loaded Shoe Brake An easily adjusted spring-loaded shoe brake is mounted on the drive shaft of the Series C, L, M and R press brake inboard of the Encl-O-Powr ram drive housing. This self-energizing brake stops the ram promptly, positively, whenever the clutch is released. Unit is completely accessible for normal easy maintenancc.

Rear view of press brake showing standard easilyadjusted, springloaded shoe brake on the drive shaft.

Housing and RaID Gibs Tough, resilient non-metallic housing gibs are bolted to the frame. Abrasion resistance and low eoefficient offriction make these gibs praetically nonscoring. Wear is redueed to a minimum, maintaining gib tole ranees longer. The ram gibs are of substantial length and have highly polished contact faees. They are readily adjustable for proper clearances and accurate alignment of the ram.

5

NEW DIMENSIONS IN BUILT-IN

THE 4 WITH MORE

STANDARD FEATURES continued

Motorized Ram Adjustment with Positive Lock PO\ver adjustment for raising and lowering ram is made by separate motor with UP-DOWN push-button eontrol. Ram is raised and lowered by a ball-bearing mounted, worm-gear drive rotating the buttress-thread adjusting screws inside the plungers. Motor and adjustment shaft are mounted on rear of ram. Split coupling on the worm drive shaft permits independent adjustment to either end of ram. Ram connections permit tilting for die alignment and normal fade out work without gib adjustment. The control used to open and close the split coupling also actuates the positive lock for ram adjustment, preventing any variation in ram adjustment setting.

Ram Adjustment Indicators Both the left and the right ram adjustment indicators on Series M and R machines are mounted together at the right front end for quick comparison reading by the oper

s ECIFICATIO s THE 4 WITH MORE

CHICAGO MECHANICAL PRESS BRAKES PROVIDE:

Increased Tonnage Range

Exclusive Encl-O-Powr Drive

MaxiInum Strength, Rigidity, Accuracy

Advanced Operating Features

Shipped Ready-to-Operate

Nationwide Sales and Service

r---c-~

r------- A -------~

~-tt------B-------+t-----;

I~ --+-----.-

T-3" Stroke

n~~~~ 6111"J- 81.1yzD Ole Space 12" ~ -l I-Yz"

I Stroke Down I I -l AdJust. Up . 4-'-~~

5Yz " E Ji *"

8

----

I I(F ? ~ ,--'(Yo SERIES W'l-t~!~::l~9~O , "':1 I!5~

-..-

-J,_ ~5 i/-,..

1012l I 46MMODEL NO. 46C 810C 1012C I 46l 1012M I 46R68C 68l 810l 68M 810M 68H 8IOR 10I2R 4' x Y4" 5' x V16" 6' x Y4 1/5' x Y4" 8' x Y4"Bending 8' x 3/16 /18' x 10 Ga 12' X VIG/I 10' X VIG" Capacity" 10' x 12 Ga 10' x10 Ga. 12' x 10 Ga. 14' x 10 Ga.

12' x 14 Ga. 12' x 12 Ga. 15' x 12 Ga. 18' x 12 Ga.

jTonnage Capacity 50/75 60/90 80/120 100/150Mid-Stroke!

Near Bottom

Stroke 3" 3" 3" 3" ,

Ram 5/14" 4" 5"I Adjustment I Strokes per 40 40 35 30Minute ,

Die Space-

Stroke Down, 12/1 12/1 12/1 12/1

Adjust Up

I 5 Hp.I 5 Hp. 5 or 7Y2 Hp, 7Y2 Hp. Drive Motor 1800 Rpm. 1800 Rpm. 1800 Rpm. 1800 Rpm.(standard) (optional)(standard) (optional) 81/1 81/1 116/1 140/1105/1 129/1 92/1 116" 140" 164/1153/1 105/1 129/1 153/1 164/1A 92"

72/1 72/1 72/1 96/1 144//144/1 96" 120/1 144// 96// 120/1 144/1 120/1B 96" 120" 72"

54/1 78/1102/1 126/1 126/1 102/1C 54" 78" 126"54" 78" 78" 102"102" 126" J 54/1

118/1 118/195\12 /I 95\12 'fD

34/1 34/1E 34Y2" 34Y2"

80/1F 60" 80"60"

48/1 48/1 56//56"G

Approximate Shipping 8,600 10,500 12,600 14,500 12,000 15,000 16,700 19,100 14,000 18,300 22,200 25,000

Weight, Ibs. 10,000 11,800 B,600 15,500

_I- -

"Bending capacity is based on 90' air bend on miid steei oyer a V-die opening eight times me/al thickness and with an inside radius approximately equal/a the metal thickness, Any machine in the indiYidual series can make the bends giYen for the series, proYided bed and ram haye sufficien/leng/h. Tonnage of mids/roke only is reduced on machines with greater than standard stroke.

9

EVERY "EXTRA" INCREASES THE

THE 4 WITH MORE

OPTIONAL FEATURES Available al exira cost

Extra Deep Throat Extra deep throat can be furnished to permit bending wide material the full length of the machine. Usually the side frames are made deeper, and the throat area may be reinforced, as illustrated. Individual requirements for deeper throat should be submitted to the factory.

'

-~._-----_.....

Special Stroke 'vVhen extra clearance is required at the top of the stroke, or for deeper forming, press brake can be built with a longer stroke. With inereased length of stroke, capacity at mid-point is redueed, while near-bottom capacity remains the same. Requirements for special stroke should be submitted to factory.

Air Counterbalance Air cylinders can be attached to counterbalance the ram. These eylinders may be required when heavy dies or attachments are added to the ram. Counterbalaneing assures smoother brake operation with less wear on bearings and gears. It takes up backlash in the gear teet.h, and play in bearings, adjust.ing screws and ram connections. \Vhen machine is used for punching, air counterbalance relieves shock load.

Punching causes shock load. reqUiring air counterbalance to offset shock.

Extra Die Space Larger die space than standard is available to accommodate deep box-forming dies and for other similar operations. Requirements for extra die space should be submitted to the factory.

Extensions to Bed and Ram (Horns) Press brake can be ordered with bed and ram extended beyond standard dimensions on one or both ends. These extensions give increased die surface for longer bends on lighter gauge material. The extension "horns" can also be used for forming tubular sections.

10

VERSATILITY OF YOUR CHICAGO PRESS BRAKE!

Tonnage Load Indicator Mounted on the side frame adjacent co the press brake gap, this indicator is calibrated in tons for direct reading of press brake load. It aids in keeping the work load within limits by warning through direct-reading dial when press brake is run over _capacity_

Overload Clutch Throwout For use with the tonnage load indicaror described above, this automatic release disengages the clutch and stops the prcss brake at any pre-set overload point.

Special Back Gauges Where frcquent gauging changcs are required, considerable time can be savcd by employing front- or side-opcrated back gauges_ These gauges are available with both manual and motorizcd operation. For full details of thesc accessories, sec Bulletin PBX_

Closeup view of front-operated back gauge handle for adjusting the gauge bar front to back, with indicator (extra) reading in inches and sixty-fou rths.

Rear view of front-operated back gauges shows synchronized uprights that support the cross bar, and adjustable fingers. Vertical travel is achieved by independently operated handle at top of each post. Front-to-back screws are supported from side housing on sturdy brackets for maximum rigidity_

Special side-operated precision back gauge is manually driven by a crank handle conveniently located on the right end housing. of machine. An indicator reading in thousandths is easily read from the operator control area.

Closeup view of one of the sideoperated back gauge upright supports showing wide base contact with the screw, and dual guide rods.

Rear view of a CH ICAGO Press Brake showing rugged mounting of the manually driven sideoperated precision back gauge. Mounted directly to the housings, gauge is extremely rigid. and screws and guide rods are permanently aligned. The aluminum cross bar is designed for minimum weight and is gusseted for strength, so that even a 12-foot span deflects an absolute minimum, preventing out-of-parallelism. Uprights supporting the cross bar have wide bases to avoid deflection when work is placed against the bar or when fingers are attached to the bar.

11

NOW- PIERCE ...... PUNCH ...... ON YOUR VERSATILE

THE 4 WITH MORE

OPTIONAL FEATURES Available at extra cost

WHILE THE PRIMARY FUNCTION of the press brake is the bending and forming of sheet metal, the die space, stroke, eapacity and width are ideal for a variety of punching and notching operations. Multiple punching on long work, or progressive operations on short work, are both within the scope of the modern press brake. CHIC,\GO Press Brakes in all sizes are available with several modifications in design which extend the advantages of press brake punching to a variety of work beyond the range possible with the standard machine. Some variations are shown in the accompanying illustrations.

Permanently Flanged Bed and Ram with Large Die Area The press brake can be built with permanent flanges on both are customarily used with this construction. It provides a the bed and the ram, providing a large die area for blanking, more rigid support and wider die area for the tooling than notching, punching and wide forming. Standard commercial available with removable angles. Long bousing gibs provide self-aligning punch and die units and standard notching dies full bearing surfaces for the ram throughout the stroke.

~11'" /"~ I I-L/_

Permanently flanged bed and ram with the flanges confined to the distance between housings. In this construction, extralong housing gibs can be provided to give full bearing surfaces to the ram throughout the entire stroke. This is especially important for off A typical permanently flanged bed and ram. Flanges extend the center loading. full length of the bed and the ram.

12

BLANK ... FORM ... NOTCH CHICAGO PRESS BRAKE

Pennanently Flanged Bed-Ralll Machined for Relllovable Angles CHICAGO Press Brakes ean be furnished with a permanently flanged wide bed-but a ram machined for removable angles. This provides a very rigid bed support for wide dies and punching equipment-while removal of the ram angles permits a wide range of normal press brake bending and forming operations.

Self-Contained Punching Units Many types of self-contained or speeial punching or notching units can be mounted on standard press brakes either directly over the die holder, speeially constructed sub-plate assemblies, or leader pin die sets. For more information contact the factory.

Both Bed and Ralll Machined for Relllovable Angles CHICAGO Press Brakes arc avaiLable with both bed and ram machined for removable angles. Photo shows angles in place, thus increasing the width of bed and ram to support punching u nits, punching allachments, and wide die sets. Machined commercial structural shapes or j~"ibricatcd angles are used, dt"[Jending on requirements. ''\Ihile the angles usually extend between the housings, shorter lengths may also be used. The angles also may extend the full length of both bed and ram. By removing the angles, a standard press brake is available for forming and bt"ndiug operations.

\

Special Applications Various modifications in design can be made to adapt CHICAGO Press Brakes to continuous production for many different special operations. The accompanying illustration shows a modified Series C press brake with special bed and ram length .

.'

iii

13

THE 4 WITH MORE

OPTIONAL FEATURES Available at extra cost

SPECIAL CLUTCH CONTROLS ... an added link between power supply and efficient production!

Variable Speed Drive A variable speed drive offers ideal speeds for safe, maximum produetion. The low speeds permit forming narrow flanges on wide sheet without fast whip-up of the wide portion of the sheet. Higher speeds are used where the nature of the work, size of the piece and operator's ability permit faster feeding of work. Variations in speed are controlled by a conveniently located hand wheel. Please note that the press brake will not operate in the lower speeds af .full rated tonnage pressure when making bmds.

Special Air- Electric Clutch ControIs Electrically controlled air operation of a mechanical clutch can be furnished as an extra, together with provision for regular mechanical foot treadle operation. The air-electric control can be operated by foot switch or palm buttons. For punching, narrow work and small piecework, the air-electric control is ideal because it lessens operator fatigue and increases production. When slipping the clu tch, as necessary for certain forming work, the mechanically operated foot treadle may be used. rllustration shows fully automatic control with selector switch for inching, single stroke, or continuous operation. Controls for inching only, or inching and single stroke can alsn be furnished.

41

Air Clutch and Brake When the press brake is to be used e~clllsively for punching or certain high-speed fabricating work whne clntch slipping is not required, it is well to consider the air clutch and brake instead of the standard mechanical clutch. With the air clutch, aireke tric con troIs are required.

14

LOWE'R 'COSTS ... INCREASE PRODUCTION WITH THE MOST VERSATILE RAM CO,NTROL IN THE INDUSTRY!

~eleef--()-~l!.euJ and Cycle Clutch Control with Exclusive 8-to-l Speed Ratio

Seleet-a-Speed is a compact planetary gear speed reducer enclosed within the press brake flywheel-with exclusive 8-to-1 gear ratio featured only in Dreis & Krump CHICAGO Press Brakes. Select-a-Speed changes the ram st.rokes per minut.e by means of two electrically controlled air-operated c1utchespermits instant select.ion of HI, LO, or a combination BI-LO ram speed-whichever sui ts the work at hand. With each of these speeds, a choice of INCB or ONCE cycling can be obt.ained by setting t.he Cycle COnirol Selector. The result is 6 different possible cycle-and-speed combinations with full raled tonnage capacity at whatever the speed.

What do Select-a- Speed settings mean?

HI-High speed, maximum standard speed of machiue in strokes per minute. for full ram cycle.

LO-Low speed, one-eighth maximum standard speed of machine in strokes per minutc, (or full ram cycle.

HI-LO-Combination of high and low speeds: high-speed ADVANCE. , . low-speed PRESS ... high-speed RETURN. Speed changes are smooth, instant.ancous, positive. PRESS portion of strokc can be lengthened or shortened 10 exae! degree required by sett.ing speed change control on back of ram.

Advantages of Operation

Increascd production Easier, safer work handling Uni formity of work. No whip-up on wide shects Faster, more accurate set-up No clutch slipping rcquired Reduced operator fatigue Easier line-up [or scribe-linc forming Minimum spoilage due to sheet breakback Minimum opcrator training

Also Available: HI- STOP- LO

This control is available at extra cost for use with Select-aSpeed. When foot switch is depresscd, ram desccnds in BI spced, to STOP at a position slightly above the work pre-set on the specd change control. Foot swit.ch is depressed again to form work in LO speed, At bottom of stroke, specd automatically changes back into BI for repeat of ram cyclc,

RAM CYCLE IN HILO SPEED

Low-Speed PRESS

(Length Adjustable)

High-Speed ADVANCE

Control Panel shows FORWARDREVERSE keylock for main drive; START-STOP pushbuttons for main drive; three-posi tion SELECT-ASPEED switch; and three,posltion CYCLE CQNTROL selector, Foot switch control with flexible cord is also included.

High-Speed RETURN

Speed Change Control on back of ram is completely variablepermits precise adjustment of PR ESS portion of stroke to suit work located over dies of ditterent heights when machine is operated in HI-LO,

15

OPTIONAL EQUIPMENT CHECKLIST

THE 4 WITH MORE

SELECT-ASPEED with Cycle Clutch Control for HI, LO, and HI-LO... 0 with special HI-STOP-LO Control. 0

VARIABLE SPEED DRIIVE 0

SPECIAL CLUTCH CONTROLS (Air Electric) INCH only .................................................... 0 INCH-ONCE. , _ 0 INCHONCECONTINUOUS 0 Foot Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 0 Palm Buttons 0

AIR CLUTCH-Spring Set Air Release Brake for punching or high-speed fabricating: (air-electric clutch control required) 0

AIR COUNTERBALANCE for heavy dies. punching. ram attachments 0

SPECIAL BACK GAUGES for frequent gauging changes: FrontOperated Back Gauges (one or two sets).. 0 SideOperated Precision Back Gauges........................ 0 Motorized " 0

EXTRA DEEP THROAT for bending wide materials fUll length of machine 0

TONNAGE LOAD INDICATOR with dial reading in tons 0

OVERlIJAD CLUTCH THROWOUT for use with tonnage load indicator 0

SPECIAL STROKE for deep forming or clearance at top of stroke 0

EXTRA DIE SPACE for deep box-forming dies, etc................................ 0

EXTENSIONS to BED and RAM (HORNS) for longer bends. tubular work. wrap-arounds 0

WIDE BED and RAM with LARGE DIE AREA Both Bed and Ram Machined for Removabie Angles. 0 Permanently Flanged Bed-Ram Machined for Removable Angles............................... 0

Permanently Flanged Bed and Ram 0

Standard-Type Press Brake Dies Off-/he-Shelf Delivery Dreis & Krump, with a network of distributors throughoul the United States and Canada, offer nationwide off-the-shelf delivery of 62 different sizes and styles of Induction Hardened slandatd dies. All are available in any length, stocked in four to 12 foot segments in two-foot increments for fast delivery. Standard-type Diekl'Ome dies are also available. Order by die number (see Bulletin STD or Catalog TD) from the factory or your Dreis & Kmmp Distributor.

Special Tooling for all makes of press brakes Dreis & Krump offer complete service in designing and building special Indllctioll Hardened or Diekromc dies

fOI' multiple bending and forming operations, and punching and notching set-ups for any make of press brake. For recommendations and quotations, submit draw ings or samples of parts to be produced, make of press brake, capacity, die spac~, stroke, and ram adjustmen l.

Press Brakes. Press Brake D'ies Hand and Power Bending Brakes Special Metal-Forming Machines

Form No. CR565 Printed in U.S.A.