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As the name implies, Hammond Flat Finishers are designed to finish flat surfaces including ferrous and non-ferrous metals, plastics, rubber, mica, wood, carbon, and even paper.  Using abrasive belts, wheels, or brushes, the Flat Finisher will accomplish stock removal, fine finishing, deburring, and scale or oxide removal.

STANDARD EQUIPMENT  -  includes an abrasive conveyor belt; variable speed conveyor drive; steel platen; one urethane-coated upper pulley and one steel or neoprene contact roll per head; and single hold-down rolls.

PRODUCTIVITY  -  Hammond Flat Finishers can eliminate many single operations by using multi-head construction.  An example would be to have a series of abrasive heads starting with coarse and ending with fine.  The parts or materials pass continuously underneath the heads reducing production time per piece.  Often the number of pieces produced per hour is limited only by the speed of loading the conveyor.

ECONOMY  -  Constant pressure and speed during use, unlike manual operations, increases the life of the abrasive belt or finishing wheel.  Also, many applications can be done wet mechanically that would require dry manually.  This keeps the finishing media clean and free-cutting for longer life.  The abrasive cost savings are in addition to the time savings.

WORK ACCURACY  -  Hammond Flat Finishers are high production surfacing machines, not precision machines such as surface grinders and not designed for use with hard grinding wheels.  Variables (e.g. the moving conveyor belt, conveyor platen, resilient contact roll and finishing media) do not allow holding of a close tolerance on production.  The typical tolerance range for this equipment is plus or minus .001" to .002".

CONVEYOR  -  The most common conveyor belts are abrasive or a rubber and fabric ply with a plain or sponge rubber cover.

An abrasive conveyor belt is usually used with an electro-magnetic platen.  The initial cost is low and, as no grinding is done with the conveyor belt, it is usually long lived.

A rubber and fabric ply conveyor belt does not produce as accurate work as an abrasive belt, but is very effective for gripping wide tolerance parts as they are slightly impressed into the belt during surfacing.  This type of belt can also be cut out in areas to accommodate protrusions on the bottom of the parts to be processed.

Sponge coverings on rubber belts are used for wide or no tolerance parts that are not uniform in thickness.  The parts depress into the sponge under the heads which compensates for the variation in thickness for this class of work.

6-inch abrasive belt on a Hammond Flat Finisher

Flat Finisher Abrasive Belt Heads are built in 6" and 12" widths.  All heads have spindles mounted on a vertical slide; have air belt tensioning; and are available for wet or dry operation.

The heavy duty abrasive belt head is accurate and designed for heavier grinding requirements.  It features automatic belt tracking and is available in 6" and 12" widths.  The automatic tracking keeps the belt between 1/4" limits using an air device which senses movement of the belt edges and pivots the upper pulley as required.  The urethane-coated pulley has a low crown and is dynamically balanced.  Manual tracking is also provided for original orientation of the belt.

Planetary Brush Heads are mounted within a cast aluminum housing; three (3) brush spindles per head.  The size of the housing and individual brushes are relative to the size of the parts to be processed and conveyor width.  The planetary action is created as the housing is rotated counter-clockwise, and the (3) individual brushes are rotated (2) clockwise and (1) counter-clockwise.  The housing drive is a 1 HP, V-belt drive developing 350 rpm.  The brush drive is a 2 HP, direct drive developing 1800 rpm for each spindle.  The head support is cast iron with a dovetail slide and is manually adjustable to compensate for brush wear.

Platens on the Hammond Flat Finisher support the conveyor belt and parts to be processed under each head.  Standard steel platens are used for non-magnetic applications. 

Electro-magnetic platens are used for magnetic materials and have variable control to adjust the magnetic density relative to the parts size and shape.  It is important when changing from one size part to another to provide the best control under the finishing head.  Magnetic chucks are provided with leveling screws.  The illustration shows an electro-magnetic platen below the heavy duty abrasive belt head.

Heavy duty belt head with emphasis on the electro-magnetic platen

Specifications for Hammond Flat Finisher Model FF-6
No. of Heads	1	2	3	4
Max. HP per Head	7-1/2	7-1/2	7-1/2	7-1/2
Max. Work Height	4"	4"	4"	4"
Contact Roll - diameter	6"	6"	6"	6"
Contact Roll - length	6-1/2"	6-1/2"	6-1/2"	6-1/2"
Abrasive Belt - width	6"	6"	6"	6"
Abrasive Belt - length	90"	90"	90"	90"
Abrasive Belt - SFPM (std.)	3800	3800	3800	3800
Conveyor Belt - SFPM - variable	45 max.	45 max.	45 max.	45 max.
Conveyor Belt - ht. from floor	37"	37"	37"	37"
Conveyor Belt - width	6"	6"	6"	6"
Conveyor Belt - length	107"	148"	189"	230"
Conveyor Belt - drive HP	1/4	1/4	1/4	1/4
Conveyor Belt - load area	16"	16"	16"	16"
Conveyor Belt - unload area	13"	13"	13"	13"
Coolant Tank Cap. - w/filter	54 gal.	74 gal.	93 gal.	107 gal.
Coolant Tank Cap. - w/o filter	78 gal.	107 gal.	135 gal.	156 gal.
Coolant Tank - Pump HP	1/4	1/4	1/4	1/4
Coolant Tank - Gal. per Minute	55	55	55	55
Dimensions Overall - height	82-86"	82-86"	82-86"	82-86"
Dimensions Overall - length	69"	93"	117"	141"
Dimensions Overall - depth	49"	49"	49"	49"

Available Accessories

Exhaust Tops - Standard for dry operation; funnels the process air and allows connection to DusKolector or customer's central exhaust system.  Also available with exhaust closures for wet applications.

Power Elevation - Motorized gear box with reversing switch permits rapid raising or lowering of head for quick change of head height.

Contact Rolls - Neoprene covered for stock removal and fine finish; available in various durometers and faces.  Steel rolls with knurled face available only for accuracy work where finish is not important.

Conveyor Brusher - Power-driven rolls brush both sides of the conveyor belt to remove grinding swarf during tolerance operations.

Work Hold-Down Rolls  (pictured at left) - (2) and (3) roll units available when careful control of the work is required.  Usually used when magnetic platens cannot be utilized.

Parts Brusher - Incorporates work hold down rolls and low RPM power driven brushes for removing grinding swarf on dry operations.

Demagnetizer - Straddles the conveyor belt at the discharge end; for removing residual magnetism from the work as required.

Access Doors - For hand application of grease or oil to grinding belt during dry operations.  Includes safety hand guard inside hood.

Parts Washer - Located on discharge end of conveyor for washing grinding swarf from work.  Includes brush guard to control overspray.

Coolant Filter - Automatic advancing paper bed filter located directly under the Hammond Flat Finisher.  Sludge tank receives used paper and grinding swarf.  Used for heavy stock removal and fine finish requirements.  Should be considered for all multi-head machine installations.

APPLICATIONS

The following are examples of the parts processed with the Hammond Flat Finisher.

Safety Deposit Box Doors     (Application #FFP-940A)

Part Size:  2" x 5" up to 10" x 11"; 1/2" thick

Material:  mild steel, C-1018

Process Requirement:  produce an acceptable uniform finish for clear lacquering

Equipment:  Hammond FF-12-4 Wet Flat Finisher with (4) heavy duty abrasive belt heads, magnetic platens, and parts washer.

Production Rate:  350 pcs. per hour

NAISC Code:  332321

Finishing Square Tubing Prior to Plating  (Application #FFP-853A)

Part Size:  1" square x 4' long

Material:  mild steel

Process Requirement:  polish (4) outside surfaces to an acceptable finish for plating

Equipment:  Hammond Model FF-6-4 Wet Flat Finisher with a 6" wide conveyor, (4) 6" x 90" abrasive belt heads, special return conveyor, and coolant system.

Production Rate:  15' of finished tubing per minute

NAISC Code:  331210

Sizing Hand Gun Frames  (Application #FFP-1327)

Part:  Hand Gun Frame                                

Material:  aluminum

Process Requirement:  remove stock from both sides to produce an acceptable finish for dry peening, and overall thickness of 1.000-.004"

Equipment:  Hammond Model FF-6-2 Flat Finisher with fixtured conveyor belt, magnetic platens, and self-contained coolant system with filter.

Production Rate:  200 sides per hour

NAISC Code:  332994

Finishing Aluminum Die Casting   (Application #FFP-1331)

Part:  Two matching die castings  

Material:  aluminum

Process Requirement:  produce suitable surface for gasket fit

Equipment:  Hammond Model FF-6-2 Flat Finisher with automatic belt tracking, magnetic chucks, fixture plates, and self-contained coolant system with filter.

Production Rate:  200 pcs. per hour

NAISC Code:  331521

Production Grinding of Automotive Disc Brake Pads   (Application # FFP-887R)

Part Size:  5" long

Material:  composition molding

Process Requirement:  grind on (1) side only to a thickness of .425" (± .003")

Equipment:  Hammond Dry Model FF-6-2 Flat Finisher with variable speed; abrasive conveyor belt 6" wide; (2) heads with air-tensioned abrasive belts 6" wide x 90" long; serrated rubber contact rolls of 90 durometer; and with hold down rolls on both sides of each head to hold part in place.

Production Rate:  1200 pcs. per hour

NAISC Code:  336340 

Removing Paint from Etched Surface  (Application #FFP-1274)

Part:  ruler; 12-inches long    

Material:  stainless steel

Process Requirement:  remove the paint from face leaving identification markings and satin finish

Equipment:  Hammond Model FF-6-2 Wet Flat Finisher with 6" wide conveyor belt and (2) 6" wide abrasive belt heads.

Production Rate:  1000 parts per hour minimum.

NAISC Code:  332212

Sizing Hack Saw Blades  (Application #FFP-854A)

Part Size:  25" long, before teething

Material:  steel body with high speed steel strip welded to one edge

Process Requirement:  grind to a thickness of .125" (± .001") by removing stock from both sides.

Equipment:  Hammond Model FF-12-3 Wet Flat Finisher with (3) heavy duty abrasive belt heads, magnetic platens, and variable speed conveyor belt.

NAISC Code:  332213

Automated Flat Finishing of Fineblanked Workpieces