SIDE CUTTERS:-
Side cutter is an accurate method of stopping arrangement used mainly for thinner strips where it is difficult to accommodate the other type of stoppers.
A side cutter is a trimming punch which trims the side of the stock material, providing a shoulder. This shoulder is stopped against a hardened insert provided in the spacer in small tools the spacer may be fully hardened to avoid the insert. the width of the side cutter is equal to the pitch.
The allowance for side cutting depends upon the type and thickness of the stock material. Table gives the allowance for side cutting for different materials.
Side cutter is an accurate method of stopping arrangement used mainly for thinner strips where it is difficult to accommodate the other type of stoppers.
A side cutter is a trimming punch which trims the side of the stock material, providing a shoulder. This shoulder is stopped against a hardened insert provided in the spacer in small tools the spacer may be fully hardened to avoid the insert. the width of the side cutter is equal to the pitch.
The allowance for side cutting depends upon the type and thickness of the stock material. Table gives the allowance for side cutting for different materials.
NO
|
MATERIAL
|
SHEET THICK NESS
|
CLEARENCE
|
01
|
Steel
|
0.2-0.4
|
2.5
|
Brass
|
0.2-0.6
|
1.5
| |
Bronze
|
1.0-1.5
|
2.5
| |
1.5
|
1.5 x s
| ||
02
|
Copper
|
0.2-0.5
|
3
|
Zinc
|
0.5-0.1
|
2
| |
Aluminum
|
1.0-1.5
|
2.5
| |
03
|
Leather, paper
|
0.4
|
5
|
Fibers
|
0.4-1.0
|
4
| |
Card boards
|
1
|
3 x s
|
The size of the side cutter will be more than the pitch by 0.05-0.1 for the purpose of registry the strip with the pilot. But in case of tools without pilot, the side cutter is made equal to the pitch. The stop position and registry position will be the same.
Due to the unbalanced cutting force cutting force acting on the side cutter, the side cutter are provided with heels. the undercut provided on thee side cutter eliminates the difficulties of feeding due to thorn formation. Thorns are small projection which occurs at the side of the strips due to the punch wear out. In side cutting there is a tendency of the slugs being coming up with the punch, causing difficulties in further punching. Slug pushers are used to avoid this. A standard side cutter shape is shown in the fig.
Due to the unbalanced cutting force cutting force acting on the side cutter, the side cutter are provided with heels. the undercut provided on thee side cutter eliminates the difficulties of feeding due to thorn formation. Thorns are small projection which occurs at the side of the strips due to the punch wear out. In side cutting there is a tendency of the slugs being coming up with the punch, causing difficulties in further punching. Slug pushers are used to avoid this. A standard side cutter shape is shown in the fig.
THE ADVANTAGES OF SIDE CUTTER :
• It is a safer method than stop pin.
• Avoids the danger of the deformation of margins of thinner strips by the stop pins, when pressed against it.
• Preferred for small punching where it could be difficult to employ other types of stops
• It is economical and avoids complications in tools where number of stages are more
• Pilots can be avoided for punching components with moderate accuracy.
The side cutter is installed in the first position of the tool. this eliminates extra stops and simplifies both construction and operation of the tool. Usually the side cutter is located along the front edge of stock strip, because of the fact that the strip are usually meant to gauge of the tool
Two side cutters, one on each side is used where the number of stages are more or if pitch is less
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