Hey Mr Tan, regarding to your question- "the problems and constraints of Cantilever Racks used in warehouse or distribution centre".
> The cantilevel rack is less effective in space usage as it uses many number of
aisles. In a warehouse, it is most ideal to have as minimal number of aisles as
the space used of the aisles could be use to accomodate more products.
> It has low storage density. Products that are heavy in their mass, are not able to
be supported by the cantilever as there is only a limited weight allowance a
cantilever is able to endure.
Although the parallel-flange beam section is being adopted by the art since it is a more economical section for most purposes. However, the parallel flange itself is weaker than the tapered flange which creates problems in the use of the cantilever racks of the indicated type because of the increasing possibility of failure of the column flanges. While this problem is partially overcome by the design shown in U.S. Pat. No. 4,065,089 because the point of load is at the root of the fillet of the flange as compared with the tip of the flange, there are other problems created with the loading at the root fillet such as penetration failures in light flange columns from the point loading of this construction. Also, this construction is undesirable in that it is necessary to mount all the cantilever arms on the column from the top down.
A limitation of the prior art cantilever rack constructions is their capability of carrying very heavy loads. Under these heavy load conditions the prior art devices are subject to the possibility of column flange tip failure and failure of the connector between the horizontal arm and the column flange.
Unlike all the above racks, cantilever rack does not have vertical members or columns in the front of the rack to limit the width of the loads to be stored. As the name implies, the storage levels are cantilevered from a rear vertical support only.
Sunday, January 13, 2008
Thursday, January 10, 2008
Cantilever rack reduces waste, simplifies handling (Article)
Buffalo Veneer and Plywood, located in Buffalo, Minnesota, is a supplier of specialty plywood using common North American tree species.
By Staff -- Modern Materials Handling, 10/2/2005
Buffalo Veneer and Plywood, located in Buffalo, Minnesota, is a supplier of specialty plywood using common North American tree species. While others in their industry have focused on large lot sales and a few woods, Buffalo Veneer remains true to its roots.
"We supply oak and birch plywood to Menards and Home Depot, but we also deal with fine cabinet makers all over the country," says Paul Erickson, company president. "We still do custom four or five sheet orders. Our reputation was built on quality and our ability to work with a variety of materials."
This kind of craftsmanship can be expensive, but it also means that Buffalo Veneer can get top dollar for the two to three truckloads of product it ships each day. The downside to this high-end market position is the cost of waste, which becomes a significantly more expensive problem as the cost of each unit goes up.
The company was experiencing some costly problems in their finished wood storage and staging area. Sheets were simply stacked on top of each other leading to hazardous lifting and product damage.
The answer to these problems was to install modular cantilever rack storage. The modular nature of the system meant that it could easily fit the available space, including the full building height that so often goes to waste in many storage facilities. Heavy duty enough to handle the heaviest loads, the modular system can be reconfigured or added onto as needed.
Wood sheets now stored individually or in small bundles to reduce abrasion and scratch damage. The product is off the floor and out of traffic lanes, eliminating accidental damage from heavy equipment. Pallets are also eliminated, along with the strap damage that goes with them.
By Staff -- Modern Materials Handling, 10/2/2005
Buffalo Veneer and Plywood, located in Buffalo, Minnesota, is a supplier of specialty plywood using common North American tree species. While others in their industry have focused on large lot sales and a few woods, Buffalo Veneer remains true to its roots.
"We supply oak and birch plywood to Menards and Home Depot, but we also deal with fine cabinet makers all over the country," says Paul Erickson, company president. "We still do custom four or five sheet orders. Our reputation was built on quality and our ability to work with a variety of materials."
This kind of craftsmanship can be expensive, but it also means that Buffalo Veneer can get top dollar for the two to three truckloads of product it ships each day. The downside to this high-end market position is the cost of waste, which becomes a significantly more expensive problem as the cost of each unit goes up.
The company was experiencing some costly problems in their finished wood storage and staging area. Sheets were simply stacked on top of each other leading to hazardous lifting and product damage.
The answer to these problems was to install modular cantilever rack storage. The modular nature of the system meant that it could easily fit the available space, including the full building height that so often goes to waste in many storage facilities. Heavy duty enough to handle the heaviest loads, the modular system can be reconfigured or added onto as needed.
Wood sheets now stored individually or in small bundles to reduce abrasion and scratch damage. The product is off the floor and out of traffic lanes, eliminating accidental damage from heavy equipment. Pallets are also eliminated, along with the strap damage that goes with them.
Tuesday, January 8, 2008
We shall now look into Single Sided Cantilever Rack and Structural Cantilever Rack.
Structural Cantilever Rack
Structural cantilever rack is a multi-level high density storage system designed to handle long length materials. Structural I-Beam cantilever rack is the most efficient and affordable way to store lumber, engineered wood products, re-bar, metal roofing, pipe, etc. Structural I-Beam cantilever rack can be used indoors or out, so it is extremely rugged. Plus, it's economical and versatile, whether it's used as stand alone storage unit, or used to support the roof of a shed or building.
Single Sided Cantilever Racks
Single Sided Cantilever Racks are ideal for against-the-wall applications. They are completely adjustable and eliminates storage problems. Long, unwieldy stock is handled quickly and efficiently by forklift; instant accessibility to one piece or a full load.They have a base assembly and arms on one side only. The arms are adjustable up and down the length of the upright wherever there are pre-drilled holes. To adjust align arms with pre-drilled holes and bolt in. All arms feature lips to prevent product from falling off.
Pictures of single sided cantilever rack
Monday, January 7, 2008
Cantilever Sheet Metal Racks
Vertical & Horizontal Sheet Metal Racks
A standard vertical sheet metal rack is designed for the vertical storage of sheet goods. Standard unit comes with four bays. Intermediate floor bracing gives added steel support while keeping material off the floor. Capacity per bay is 1,500 lbs. Unit is supplied with lag down points. Powder coat finish.
Vertical or horizontal sheet storage rack for sheet metal, plastic sheets and plywood. Sheet racks helps organize your shop and allows for easy access and identification. We supply heavy duty roll-out shelf racks, cantilever rack and steel storage racks for bar stock, rods, steel angle, pipe and tube storage.
Horizontal sheet racks are designed for storage of sheet goods and similar materials. The flat storage of our horizontal sheet metal rack reduces warping of thin materials. Five shelf design allow for generous storage of multiple thickness materials. Distance between shelves is 91/2". All welded steel frame allows for 2,000 pound capacity per shelf. Four sided access when using 4' x 8' sheet or smaller. Sheet metal racks are supplied with lag down points.
Lumber Rack (For Home Centers & Lumber Yards)
Upright is 4"x4" lumber appropriate length for building height.
Uprights are spaced so as to hit studs in wall. A 6" lag screw is driven through top of each post and into stud (drill pilot holes).
Shelves are ½" black iron gas pipe (have cut at local supplier to 15"-18"). Shelf bottom plate is pressure treated (if on concrete) and is anchored to floor via anchors. You may also fit PVC pipe over top of black iron piping to prevent marring lumber.
Layout shown is for side wall (wall supporting truss). If this is built on adjacent wall, turn top plate 90° and secure top plate to wall instead of ceiling.
Drill perpendicularly into uprights to receive gas pipe. Suggest a 6" hole spacing pattern for maximum flexibility. Space bottom shelf holes close to floor for maximum storage.
Horizontal shelf behind rack is for plywood storage. it is not necessary to support shelf.
On the uprights, a 10° angle is used to help center load over bottom plate, and to limit stress on wall. The angle was selected because it was center of gravity for a nine foot high shelf.
Shelf can be installed over drywall, or on bare studs.
Eight of these units spaced 16" apart can store 12' lumber. Use more or fewer units as needed. Spacing is then close enough to sticker and stack lumber for drying. Also great for storing dried project lumber.
Recommend uprights are cut to length individually to accommodate uneven floors…while in place, use chalk line to lay out pipe holes.
Sunday, January 6, 2008
Heavy Duty Metals Rack
It makes storage of long or awkward materials safe and efficient which saves time and money. Often business warehouses put bulk items like aluminum sheets, flake board, dry wall and steel sheets in piles on the floor creating an unsafe and unorganized working environment for warehouse personnel. Instead of having warehouse staff constantly sort and organize unrelated bulky and awkward material, cantilever racks allow you to segregate and store bulky materials by commodity and size. Over time cantilever racks will pay for it self by reducing injuries to employee, increase worker efficiency and improve employee accuracy in stock selection.
It also offer clear frontal access to the storage levels. Unlike conventional racks, cantilevers have no vertical obstructions in the storage area. That lets you make full use of space from side to side on each level. Store materials of varying lengths without interference or modification to the cantilever rack.
The rules governing how to position heavy duty cantilever rack arms:
Rule 1 - use the correct amount of arms so the divided weight does not exceed arm capacity. So a 6000 pound load would require at least 6 arms with 1000 pound capacity per arm.
Rule 2 - total overhang = (1/#arms) X Product length. For example, a 20 foot run with 4 arms. Total overhang = (1 / 4) X 20 feet = 5 feet. So in this case 2, feet can overhand left and right. This is as complicated as cantilever racks get!! Not exactly rocket science.
Rule 1 - use the correct amount of arms so the divided weight does not exceed arm capacity. So a 6000 pound load would require at least 6 arms with 1000 pound capacity per arm.
Rule 2 - total overhang = (1/#arms) X Product length. For example, a 20 foot run with 4 arms. Total overhang = (1 / 4) X 20 feet = 5 feet. So in this case 2, feet can overhand left and right. This is as complicated as cantilever racks get!! Not exactly rocket science.
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