It is impossible to ignore the significance of moving parts when working with keyways, splines, or internal profiles. The important part of the slotting machine is the ram, which holds the cutter and makes each stroke. All this influences the accuracy of slot making. Knowledge about the importance of this element allows operators to work with precision and efficiency, make clean cuts, extend tool life, and produce slots straighter.
What Is a Ram in a Slotting Machine?
The ram is the primary motion-making component in a slotting machine. The ram is a robust rigid slidable component which is fitted with the cutting tool and is made to move up and down in a vertical direction. The vertical motion of the ram makes it possible for the cutting to take place on internal keyways, splines, slots, and even irregular shapes which cannot be done by other machines.
How Does the Ram Function?
The ram operates within the guideways that are built in the column of the machine. It is provided with reciprocating motion through a driving arrangement. The common drives include:
- Crank and slotted link drive: It converts the rotational motion of the gear to reciprocating motion of the ram. Also gives a quick return.
- Rack and pinion drive: It is a direct stroke.
- Hydraulic drive: It provides smooth motion and also uniform cutting speed.
The tool is mounted in the tool post at the bottom of the ram. The cutting action takes place during the down stroke while the up stroke of the ram brings back the tool without cutting. This is why each stroke saves time. In case you are preparing for a new setup or buying machinery, the type of ram drive system of your slotting machine will depend on your requirements.
Functions Performed by the Ram
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Holds the cutting tool: The ram clamps down on the tool and positions it during the entire stroke.
- Delivers the cutting action: This vertical action delivers cutting action for removing metal from the job.
- Stroke regulation: The stroke is adjustable according to the size of the cut, which makes the process more efficient.
- Accuracy: Precise and rigid movement within the guideways ensures straight slotting and proper dimensions.
- Quick return: Faster return stroke increases efficiency.
- Position adjustability: The ram can be positioned for varying height jobs.
Why is the Ram Important for the Cutting Operation?
The accuracy of a slotted piece greatly relies on the quality of the ram. When the ram is rigid, there will be no deflection when it receives cutting forces, resulting in straight and square slots. A ram that is old and out of alignment leads to vibration, poor cuts, and poor finishes on the workpiece. Since the cutting force acts directly on the ram during each downstroke of the tool, wear and misalignment of the guideways translate to poor cut quality.
Maintenance of the Ram
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Lubricate the guideways for smooth ram movement.
- Align the ram to the table.
- Adjust the gib to eliminate play but do not make it tight.
- Prevent chips and dust from entering the guideways.
- Properly set the stroke length before you start each job.
Conclusion
The ram is the heart of the slotting machine. The ram holds the tool that performs the cutting action on the slots. If the ram is maintained well and remains strong, it ensures good performance of the slotting machine.
Frequently Asked Questions
Is the ram cut performed on both strokes?
No. The tool performs the cut only on the descending stroke. The ascending stroke is called the return stroke and does not perform any material removal operations.
Is the stroke of the ram adjustable?
Yes. The stroke is set by the operator in accordance with the size of the stroke and contributes to the efficiency and safety of operation.
What will happen if the ram gets worn?
Worn ram is characterized by vibration, inaccurate work and poor surface finish. Regular lubrication can reduce such failures.
What kind of work is the ram of a slotting machine designed for?
The ram holds the tool that performs the cuts of internal keyways, splines, slots and other irregular profiles. These profiles are hard to obtain using other machines.
How frequently should the guideways of the ram be lubricated?
The guideways should be lubricated prior to each shift.