SKH · MQ · HQ series · Scrap cutting
Scrap Chopper Machine for Punch Presses
Cut continuous metal strip and skeleton waste into short pieces, right at the press.
See how this automatic scrap cutting machine works at the die outlet. Then select the model around your scrap width, thickness, material and production speed.
How the scrap chopper works 45-second demonstration
Illustrative 3D demonstration of an SKH-100 scrap chopper.
A compact cutter on an adjustable stand
The SKH chopper is one compact unit: a vertical gear motor on a body of precision-ground steel plates, carried on two columns over a floor base. Scrap enters the hopper at the top, and the cut pieces drop out underneath into your bag, bin or drum.
- Vertical gear motor. It drives the cutter through an eccentric; the motor has thermal protection.
- Machined steel body. Plates and slide in 45-grade carbon steel, lubricated as the manual specifies.
- Moving and fixed blades. SKD-11 or DC53 in the listed series; SKH-9 can be assessed for your scrap.
- Hopper on the slide. It guides the strip or skeleton down to the cutting line.
- Adjustable stand. Column clamps set the height and the tilt to match the die outlet.
- Switch box and oil cup. Start and stop at the machine; lubricate the sliding assembly.
One configuration is shown. The supplied model, blades, stand and guarding are selected for your actual scrap and installation.
The model number is only a starting point
Two waste strips with the same overall width and thickness can impose different cutting loads. Describe the working combinations and the connected material that reaches the blade.
What is the corresponding material thickness?
What is the corresponding scrap width?
Material grade and strength
Send the grade, condition and available tensile strength or hardness. High-strength steel or hard stainless scrap may require a heavier-duty or custom build even when it appears to fit a standard table.
Cross-bridges and scrap shape
A bridge across the waste strip can put more material into the cut at once. Send a flat photo or drawing that shows the complete repeating shape and the intended feed direction.
Speed and cut length
Provide feed pitch, operating press speed and preferred chopped length. The required cutting frequency is assessed together with the peak load and the scrap route.
For demanding scrap, confirm by test cutting. Wide, thick, high-strength or heavily bridged scrap should be reviewed with representative samples. We agree the blade, drive, frame and test conditions before recommending a final configuration.
See the scrap shape before selecting the machine
These application views show different waste forms and collection arrangements. Each example requires its own material and operating details; a photo alone does not establish cutting capacity.
Skeleton scrap with cross-bridges
Review the transverse connections and the amount of material engaged in each cut, not just the outside strip width.
Large round-hole skeleton
Review the remaining webs, strip stiffness and how the skeleton travels from the die into the inlet.
Narrow punched strip
Review the remaining connections, cut direction and discharge route for the actual punched strip.
Perforated strip into a collection drum
Match the chopped length and collection arrangement to the production rate and handling space.
Narrow continuous waste strips
Assess each waste stream and its inlet path. Narrow material still needs material and cutting-load checks.
Press-side collection
Confirm the available installation height, bin clearance and access for emptying and service.
Standard, medium-duty and heavy-duty series
Use this table to discuss the available configurations. Listed width and thickness bands are not a guarantee that the maximum width and maximum thickness can be cut together.
Final selection requires your material and scrap sample. Material grade/strength, width at each thickness, cross-bridge geometry and production duty determine suitability. The reference does not specify a single base material or strength for all rows.
Estimate the cutting frequency your line needs
Start with average strip advance, then relate it to the desired scrap cut length. This is a rate calculation, not an automatic model selector.
Estimated cutting cycles/min = average strip advance ÷ target scrap cut length (mm)
Cutting-frequency estimate
Example: 50 × 120 = 6,000 mm/min; 6,000 ÷ 30 = 200 cutting cycles/min.
Press speed and cutting speed are different. This estimate assumes one feed pitch per press stroke and one cut per cutting cycle. Intermittent feed timing, peak speed, loop behavior and cutting load require a separate review. A shorter cut length increases the required cutting frequency.
Fixed-speed and VFD configurations can be discussed. Reference cutting-frequency options include 70, 95, 120, 150, 200, 300 and 500 cycles/min. These are configuration options—not a universal speed range or a matching press-speed rating for every model.
Watch continuous scrap become manageable pieces
The latest application video follows perforated skeleton, narrow punched strips and ladder-shaped waste from the press outlet to the cutter and collection container.
Larger frames, covers and electrical options
Machine size and enclosure design can be adapted to customer requirements. These views show configurations; appearance alone does not identify the material capacity or standard supply scope.
Larger frame configurations
Discuss wider cutting assemblies, larger support frames and collection clearance around the actual waste path.
Project-specific guarding
Mesh guards, covers and access arrangements can be designed around site requirements and the approved operating layout.
Electrical supply to order
Specify voltage, phase and frequency. The motor and controls are configured for the agreed supply, rather than assumed to switch automatically between voltages.
Custom covers and collection space
Cover and inlet layouts are agreed for the customer installation. Confirm service access and the collection-container arrangement.
VFD and control-cabinet options
Variable-frequency-drive and control-cabinet configurations can be specified for the cutting duty and site interface.
From die outlet to collection container
The installation must handle the real scrap path and operating rhythm. An average feed-rate calculation alone does not establish the inlet layout or required cutting load.
Match the outlet and inlet
Review die-exit height, approach angle, available space and support for the actual strip or skeleton.
Agree the operating controls
Specify fixed speed or VFD, start/stop requirements and any requested press interface. Do not assume one chopper stroke for every press stroke.
Plan the collection route
Provide room for the required bag, bin or drum and convenient removal without blocking the scrap path.
Verify at production duty
Check representative scrap at the intended feed and cutting conditions, including transitions across bridges and changes in shape.
Match the blade and maintain the sliding assembly
Blade condition, lubrication and a suitable cutting arrangement support consistent chopping. Service settings must follow the manual for the supplied model.
Machined sliding components
The supplied technical reference specifies 45-grade carbon-steel plate and slide construction. Keep the sliding assembly lubricated and inspect it according to the operating manual.
Blade configuration
SKD-11 and DC53 are listed across the reference series. Discuss application-specific options, including suitable SKH-9 blades, for the selected material and duty.
Overload and service checks
The supplied reference describes motor thermal protection. Confirm it in the selected electrical configuration; it does not replace proper selection, lubrication or stopping to investigate a blockage.
Blade replacement and inspection
The existing tutorial provides a maintenance overview. Isolate power before clearing waste or servicing the cutting area, and use the instructions for the supplied model.
- Check for wear, incomplete cuts, folding or abnormal noise.
- Follow the model-specific lubrication schedule.
- Set the blade arrangement and clearance for the actual material.
- Stop and investigate repeated overload or scrap accumulation.
CE documentation and supplied-machine records
The existing CE document remains available here. Request the applicable certificate and supporting documents for the model and configuration being quoted.
Confirm documents with your quotation
Ask for the model identification, electrical specification, operating instructions and relevant CE documentation for the proposed supply.
Customized electrical systems, guarding and interfaces should be described in the agreed equipment specification.
Workshop and configuration gallery
Additional views of the inlet, support frame and electrical arrangements. Keep the exact configuration in the quotation matched to the intended scrap.
View seven additional equipment photos
White adjustable-stand configuration
Full-height equipment view.
Control-cabinet arrangement
Side view of the cabinet and stand.
Standard-style equipment in the workshop
Inlet, motor and support detail.
Wide-build workshop view
Larger cutting assemblies and frame layouts.
Inlet and stand overview
Alternative view of the white equipment configuration.
220 V labeled configurations
Examples shown with 220 V labels; specify your own voltage, phase and frequency.
Variable-speed equipment lineup
Additional view of the controls and support arrangement.
Send the scrap details. We will review the configuration.
A model number or one maximum dimension is not enough for a reliable recommendation. Send the working pairs and a clear view of the waste shape.
Your selection checklist
- Widest scrap: width and its corresponding thickness.
- Thickest scrap: thickness and its corresponding width.
- Material: grade, condition and available strength or hardness.
- Shape: photos/drawing of holes, cross-bridges and the repeating pattern.
- Production: feed pitch, normal/maximum press speed and target cut length.
- Installation: outlet height, feed direction, available space and collection route.
- Options: voltage, phase, frequency, guarding, controls and destination.
Have several different scrap types?
Send the widest and thickest working combinations separately, plus the hardest material and most demanding bridge pattern. Include photos or a short video for each relevant case.
For wide, thick, high-strength or heavily bridged scrap, discuss representative test cutting before confirming the model.
Price and delivery depend on the selected configuration and agreed supply scope. Request a project quotation.
Scrap chopper FAQs
Answers for selecting a press scrap cutter and preparing an application-specific request.
What is a scrap chopper machine used for?
Can I select a model from thickness and width alone?
Why do cross-bridges in skeleton scrap matter?
Can the chopper cut high-strength steel or stainless steel?
Is 500 cuts per minute the same as a 500-SPM press?
Can voltage, machine size and guarding be customized?
Can the cutting speed be adjusted?
What blade materials are available?
When should I send scrap for test cutting?
What should I check during maintenance?
How is the scrap chopper price determined?
Explore the handling method and application
Use the product page for configuration and quotation; these guides discuss specific choices and waste forms.
