capt lar once whispered in the wind:
there is a "sascot plow anchor" that is a copy of the lewmar cqr. they tell me "by vacuum casting instead of forging, sascot reduces cost without sacrificing strength...".
The Casting versus Forging issue has been a subject of much debate for some time.
I won’t solve the matter here - I just don’t know enough.
FWIW - Some Basics:
is the (relatively inexpensive) production of parts
by pouring molten metal into a mold
. The mechanical properties in a casting are distributed equally in all directions due to the unidirectional grain structure of a cast part. When the design of the part goes beyond a simple shape, a casting may quickly become a more economical choice than a forged piece.
There are two methods, and several mold
casting is the simplest, cheapest (& oldest) method, whereby the molten material is poured into a mold and allowed to cool. These molds are usually made by machining a piece of material on CNC machine equipment
to produce a part that only requires minor finishing (like drilling or possibly trimming of some excess metal) to be considered complete.
(low pressure or negative pressure) casting is a better method, whereby, instead of pouring the molten material into the mold, the molten alloy is drawn up into the mold using a high-pressure vacuum. This eliminates much of the trapped air found in gravity casting process, producing a stronger part that’s less porous than a gravity-cast part. Recent advancements in vacuum die casting (VDC) have resulted in improvements to the quality of these alloy castings, and VDC is currently being utilized as an alternative to precision forgings.
is the processes that uses plastic deformation, by pressure or impact blows, to cause a workpiece to attain the required shape. Usually the compressive force is in the form of hammer blows using a power hammer, or a press.
A forging will have higher strength in one direction than another due to its directional grain structure. Forging refines the grain structure and improves physical properties of the metal. With proper design, the grain flow can be oriented in the direction of principal stresses encountered in actual use. Grain flow is the direction of the pattern that the crystals take during plastic deformation. Physical properties (such as strength, ductility and toughness) are much better in a forging than in the base metal, which has crystals randomly oriented. Forged anchors are typically lighter and stronger than their cast counterparts; however they also tend to be more expensive due to the cost of the manufacturing and machining processes.
Forgings are consistent from piece to piece, without any of the porosity, voids, inclusions and other defects sometimes found in castings. Thus, finishing operations such as machining do not expose voids, because there aren't any. Also coating operations such as plating or painting are straightforward due to a good surface, which needs very little preparation.
Three types of forging are (hot & cold): open die, impression die, and closed die forging.
The metal can be forged hot (above recrystallization temperatures) or cold.
forgings or hand forgings are made with repeated blows in an open die, where the operator manipulates the workpiece in the die. The finished product is a rough approximation of the die. This is what a traditional blacksmith does, and is an old manufacturing process.
forgings and precision forgings are further refinements of the blocker forgings. The finished part more closely resembles the die impression.
is a closed die method, using a slow squeezing action of a press, to transfer a great amount of compressive force to the workpiece. Unlike an open-die forging where multiple blows transfer the compressive energy to the outside of the product, press forging transfers the force uniformly to the bulk of the material. This results in uniform material properties and is necessary for large weight forgings. Parts
made with this process can be quite large as much as 125 kg (260 lb) and 3m (10 feet) long.
Never having seen a “sasquatch”, nor a "sascot plow anchor", I cannot comment on it’s relative quality/value - tho’ I might place similar ‘faith’ in both ...