• What Is The Mechanism Used In Slotting Machine For Sale
• What Is The Mechanism Used In Slotting Machinery
• Which Mechanism Is Used In Slotting Machine
• What Is The Mechanism Used In Slotting Machines

In slotting machine work is held in vertical position on the table of slotting machine. The cutting tool in slotting machine reciprocate in vertical direction and removes the extra material from work piece, work is done only at downward stroke i.e cutting action takes place at downward direction and the remaining upward stroke is idel one. DRC Planer & Slotting Machines Features1: The table of the planer can rotate the left and right angles, and the worktable has a moving structure of lateral and lifting; it is used to plan the inclined plane, thereby expanding the scope of use.2: The feeding system of the planer adopts a cam mechanism, and it is very convenient to adjust the.

QuickReturnMechanism

The ram moves at a comparatively slower speed during the forward cutting stroke. During the return stroke, the mechanism is so designed to make the tool move at a faster rate to reduce the idle return time. This mechanism is known as quick return mechanism.

As the ram moves at a faster rate during return stroke, the time taken becomes less. The total machining time decreases and the rate of production increases. The following mechanisms are used for quick return of the ram.

1. Crank and slotted link mechanism
2. Hydraulic mechanism
3. Whitworth mechanism

CrankandSlottedLinkMechanism

An electrical motor runs the driving pinion(S) at a uniform speed. This pinion makes the bull gear (M) to rotate at a uniform speed. Bull gear is a large gear fitted inside the column. The point ‘O’ is the centre of the bull gear. A slotted link having a long slot along its length is pivoted about the point ‘K’. A sliding block ‘N’ is fitted inside the slot and slides along the length of the slotted link. ‘P’ is the crank pin and ‘OP’ can be considered as a crank.

When the bull gear rotates, the sliding block also rotates in the crank pin circle. This arrangement provides a rocking movement to the rocker arm. As the top of the slotted link is connected to the ram, the ram reciprocates horizontally. So, bull gear rotation is converted into the reciprocating movement of the ram.

What Is The Mechanism Used In Slotting Machine For Sale

Quick Return Mechanism

As shown in the diagram, ‘KA’ indicates the starting point of the forward cutting stroke and ‘KB’ the end of the cutting stroke. The rotation of the crank ‘OP’ in clockwise direction through the angle P₁RP₂ refers to the forward cutting stroke. The rotation of the crank in the same direction through the angle P₂LP₁ refers to the return stroke. As the angle P₂LP₁ smaller than the angle P₁RP₂, the time taken for the return stroke is less than that of forward stroke. So, it is evident that the speed at which the ram travels during return stroke is more.

Time taken for forward cutting stroke angle P₁RP₂ 216⁰ 3

————————————————- = —————————- = ——————- = ——————

Time taken for the idle return stroke angle P₂LP₁ 144⁰ 2

In some machines this ratio can be set as 7/5.

The strokelength of a ram is the distance the ram moves forward or backward. It depends upon the distance between the centre of the bull gear and the centre of the sliding block. it is adjusted according to the length of the work.

Machining is basically one material removal process where excess material is sheared off by the mutual interaction between workpiece and cutting tool. There exist several machining processes to cater the need of processing a wide variety of workpiece materials in innumerable ways. For examples, lathe operations (such as straight turning, taper turning, internal turning, threading, grooving, etc.) are primarily carried out to generate cylindrical or conical surfaces. Milling operations are carried out primarily for generating flat surfaces. Similar to the lathe and milling operations, shaping and planing are two machining processes that can generate flat surfaces at different planes or orientations. However, the rotation of workpiece or cutting tool imparts necessary cutting velocity the lathe operations and milling processes. On the contrary, both shaping and planing processes utilize only reciprocating motion to provide three necessary process parameters (cutting velocity, feed motion, and depth of cut).

Since reciprocating motion is utilized to impart cutting velocity both in shaping and planing, so either the cutting tool or the workpiece is required to reciprocate. Here, only forward stroke is utilized for removing material, while the backward stroke is kept idle. So cutter engages with the workpiece only in forward stroke. Since backward stroke does not involve in cutting, so the time of this redundant stroke can be reduced while giving more time for forward stroke. Quick-return mechanism is commonly employed to for this purpose. Although both shaping and planing utilize quick-return mechanism, their main difference lies on the point of application of cutting velocity. In shaping, the reciprocating movement of the tool provides cutting velocity; while in planing reciprocating movement of work table (workpiece) provides intended cutting velocity. Accordingly, quick-return mechanism is integrated with the cutter for shaping operation and with the worktable in planing operation. Although there are many similarities among shaping and planing, they are different in many aspects, as discussed below.

What Is The Mechanism Used In Slotting Machinery

• Both shaping and planing are conventional machining operations that follow subtractive manufacturing approach (layer-by-layer removal of material from a solid blank).
• Both utilizes general purpose machine tools (shaping machining and planing machine).
• None of them utilize any rotational motion (as in case of turning, milling or drilling). Only reciprocating motion is used to impart required cutting velocity, feed and depth of cut.
• Areas of application of both the processes are also similar. This includes making straight slots, grooves, pockets, T-slots, V-blocks, etc.
• None of them can produce any curved slots (like circular or parabolic slot).
• In both the cases, excess material is removed from the workpiece in the form of chips (this is unlike non-traditional machining processes where material can be removed in various forms including ions, atoms, vapor, solid debris, etc.).
• Both utilize single point cutting tool (shaping tool and planing tool have only one active cutting edge that participates in material removal action at a time).
• Quick return mechanism is employed in both the machine tools; however, their point of application are different.

Which Mechanism Is Used In Slotting Machine

Shaping	Planing
Shaping is one machining operation where workpiece is held stationary while cutting tool (ram) is reciprocated across the work.	Planing is similar machining operation but here the cutting tool remains stationary while workpiece (worktable) is reciprocated under the cutter.
Workpiece (bed) imparts feed motion, while cutting tool gives cutting motion.	Workpiece (table) imparts cutting motion, while cutting tool gives feed motion.
Shaping operation is performed in a machine tool called Shaper (also called shaping machine).	Planing operation is performed in a machine tool called Planer (also called planing machine).
Here quick-return mechanism is integrated with the ram that holds the cutter. So shaping machine uses quick return mechanism for tool movement.	Here quick-return mechanism is integrated with the worktable that holds the workpiece. SO planing machine uses quick return mechanism for worktable movement.
Shaper is traditionally a small machine and preferred for smaller jobs.	Planer is larger machine and can accommodate heavier and larger jobs.
It provides low MRR, thus shaping is less productive.	Planer has longer stroke length and can take heavy cuts, so MRR is high and the operation is productive.
Only one cutting tool can be used at a time.	Facility to accommodate multiple tools and simultaneously using all of them is also available in some planing machines.

References

• Machining and Machine Tools by A. B. Chattopadhyay (Wiley).
• Metal Cutting: Theory And Practice by A. Bhattacharya (New Central Book Agency).
• DeGarmo’s Materials and Processes in Manufacturing by J. T. Black and R. A. Kohser (Wiley).

What Is The Mechanism Used In Slotting Machines