Band Saw
|Sheet Metal Shear |
|Dept: |Multi-department |Laboratory: |Student Machine Shop |Rm: |HML High Bay |
|Authored by: |________________________________________ ____________ |
| |Dick Sevier, Research Support Engineer Date: |
|Reviewed and Approved by: |________________________________________ ____________ |
| |Matt Lundgren, EH&S Lab Safety Officer Date: |
|Filename: |Sheet Metal Shear 17-Oct-11.doc |Revision: |1 |
|Procedure Type | Process/Protocol | Chemical | Hazard Class |
|Brief Overview & Scope |This procedure provides general instructions on how to use the sheet metal shear. The shear is used to make a straight cut in a |
| |piece of sheet metal. The material is introduced between the cutter head and the table. A foot switch is pressed to actuate a |
| |pneumatic cylinder, which drives the cutter head downward, shearing the sheet metal. |
| |This document describes typical operations only; consult a shop supervisor if you need to perform an operation not described |
| |here. Maintenance and setup of the tool are beyond the scope of this document due to the skill required and diversity of tools |
| |and processes associated with these operations. |
|Potential Hazards |Amputation or other injury to fingers or hand when placed between cutting head and table |
| |Injury to eye from flying debris |
| |Pinch or cut to fingers or hand if placed between sheet metal and table during actuation. |
| |Cuts to fingers when handling sheet metal |
|Engr. Controls |Blade guard on front., covered foot switch |
|PPE |Safety glasses, non-slip, close-toed shoes |
|Add'l Equipment, Tools: |none |
|Mat’ls, Supplies: |none |
|Add’l Training Requirements |All mandatory shop training modules |
| |Hands-on training for this tool |
|Special Requirements: |
|Handling & Facilities |n/a |
|Spill & Incident |n/a |
|Decontamation/ Waste Disposal |n/a |
|Sources/ |Some content for this procedure have been taken from the user manual for National N5212 air shear. |
|References | |
TABLE OF CONTENTS
Tool Components 2
General Tool Safety Rules 3
COMMON Tasks 4
1. Placing Sheet Metal on Shear 4
2. Setting Depth of Cut 4
3. Making Right Angle Cut 4
4. Making Angled Cuts 5
5. Cleanup 5
|Tool Components |
| |
| |
|General Tool Safety Rules |
|WARNING: Always operate this machine from the front; do not operate if there is someone standing behind it as they may be injured by coming in contact with the |
|moving cutter heard assembly. |
|WARNING: Never place a finger, hand or other part of the body underneath the blade or hold down area. |
|Failure to keep body parts from this area could result in severe injury. |
|WARNING: Take care to keep fingers above the material to be cut. If a finger is placed under the material, it will become pinched when the hold-down is lowered |
|against the top of the tool during cutting. |
|Safety glasses are required to use this tool. |
|WARNING: To prevent entanglement with cutterhead, tie back long hair and tuck under shirt, roll up long sleeves, and remove loose clothing. |
|Do not use any machine in which a guard or cover has been removed. Contact the shop supervisor immediately. |
|Avoid accidental actuation; know where foot switch is located. Move foot switch next to machine when not in use. |
|Maintain a safe working area free of people obstruction of 5' on sides and 10' in front of machine and 10' behind machine. |
|Wear slip-resistant shoes to maintain a secure footing and balance. |
|Disconnect the machine from the house air source immediately if odd noises are heard. |
|Material limitations: |
|Max thickness: 12 gauge (0.113" / 2.9 mm max) |
|Max. width: 48" |
|Acceptable materials: mild (low carbon) steel, aluminum, soft plastic sheet. |
|WARNING: Do not attempt to cut stainless steel, spring (high carbon) steel or brittle materials with this machine or injury and/or damage to equipment may |
|result. |
|If you have any questions about this tool or its use, stop what you are doing and ask a shop supervisor. |
|COMMON Tasks |
|Placing Sheet Metal on Shear |
|WARNING: When handling heavy pieces of sheet metal or sheet metal with sharp edges, put on leather or cloth goves to keep from cutting your fingers. |
|Place sheet metal on table and slide under cutter head. |
|Setting Depth of Cut |
|This can be done either one of two ways: |
|Using Backstop (can be used for repetitive cuts) |
|Loosen the knob and slide the backstop so that the stop surface is the desired distance from the edge of the lower blade. A scale is provided on the backstop |
|guides to show distance to blade. If more precision is required, use a tape measure on each side to measure distance from blade to backstop. |
|For square cuts set both backstops to the same distance. |
|Once the backstop is set, push the sheet metal between cutter head and table until it contacts the backstop angle. |
|Visual Alignment |
|Mark the material with the desired cut line. |
|Loosed the back stop knobs and slide the back stop well beyond the depth of cut needed. |
|Look straight down at the cutter head. There is a narrow gap between the upper blade edge and the hold-down that runs the width of the shear. |
|Align the cut line on material cutting edge of the upper blade or by setting the back stop angle behind the shear. Mark the point at which you would like to cut|
|the sheet metal. |
|Making Right Angle Cut |
|Slide material up fully against either the right or left registration guide according to preference while maintaining proper depth as described earlier. |
|Once material is properly positioned on the table, place one or both hands on the workpiece. WARNING: Failure to keep your fingers above the workpiece and/or |
|standing behind the machine when it is actuated could result in crush or amputation injury. |
|Slide a foot into the foot switch and press the pedal down once. This will bring down the upper blade and shear the material. |
|Making Angled Cuts |
|Angled cuts are best made using visual alignment as described in the Setting Depth section. |
|Once the material is properly positioned, place one or both hands on the workpiece. |
|WARNING: Failure to keep your fingers above the workpiece and/or standing behind the machine when it is actuated could result in crush or amputation injury. |
|Slide a foot into the foot switch and press the pedal down once. This will bring down the upper blade and shear the material. |
|Cleanup |
|Pick up any scrap material and recycle if possible. |
-----------------------
Cutter Head Assy
Upper Blade
(behind hold-down)
Material Supports
Hold-down
Foot Switch
Back Stop
Table
Upper
Blade Edge
Cut Line on Material
Material
Registration Guide
Upper
Blade Edge
Simulated Material
Material
Cut Line on Material
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