XM91 Dense Pole Magnetic Chuck for Grinding Machine
The XM91 is a dense pole permanent magnetic chuck for surface grinding. The pole pitch is close, at 1.5+0.5mm, and that is the point of the design: with the magnetic lines packed tightly together the field is uniform across the face and short enough to grip a thin part that a coarse pole chuck would simply let go. Smal...
What This Machine Does
The XM91 is a dense pole permanent magnetic chuck for surface grinding. The pole pitch is close, at 1.5+0.5mm, and that is the point of the design: with the magnetic lines packed tightly together the field is uniform across the face and short enough to grip a thin part that a coarse pole chuck would simply let go. Small and thin workpieces that cannot be clamped in a vise without bending are held flat and ground on the first pass. Magnetism is 100 N/cm2 or more across the range. Being permanent magnetic, the chuck needs no power supply and does not heat up, so the ground surface is not affected by chuck expansion. Nine and more sizes are listed from 175x100mm up to 400x200mm and beyond, all at 45mm height, with net weights from 6kg to 28kg. The chuck is used on flat grinding machines, spark machines and cutting machines.
Why Buyers Choose This Machine
- Dense pole pitch of 1.5+0.5mm grips thin and small parts that coarse pole chucks release
- Uniform magnetism across the face holds the part flat so it grinds true on the first pass
- Magnetism of 100 N/cm2 or more on every listed size
- Permanent magnet design needs no power supply and no cable to the machine
- No coil heating means the chuck does not expand and pull the ground surface out of flat
- Size range from 175x100mm to 400x200mm and above suits most surface grinder tables
- Works on flat grinding machines spark machines and cutting machines alike
Where XM91 Dense Pole Magnetic Chuck for Grinding Mach Earns Its Place
Problems It Solves
- Thin parts bend when clamped in a vise and spring back out of flat after grinding
- Coarse pole chucks cannot hold small parts because too few poles are in contact
- Clamps and stops obstruct the wheel and leave areas that cannot be ground
- Electromagnetic chucks heat up and their expansion affects the ground surface
- Losing a small part off the chuck during grinding damages the wheel and the work
Who It Is For
- Grinding shops working on thin and small components
- Toolrooms grinding shims plates and die components
- EDM and cutting operations needing magnetic workholding
- Distributors supplying magnetic chucks to machine shops
Application Scenarios
- Surface grinding thin flat parts that cannot be clamped in a vise
- Holding small workpieces on a flat grinding machine table
- Workholding on spark erosion machines
- Holding parts on cutting machines where clamps would obstruct the tool
- Batch grinding of shims plates and thin blades
Technical Detail
Technical Features
- Dense pole permanent magnetic chuck design
- Polar distance 1.5+0.5mm
- Magnetism 100 N/cm2 or more
- Uniform magnetic field across the working face
- 45mm chuck height across the listed sizes
- No power supply required
- Suitable for flat grinding machines spark machines and cutting machines
Specifications
| Machine type | Dense pole permanent magnetic chuck |
|---|---|
| Models | XM91-100*175 XM91-125*250 XM91-150*150 XM91-150*300 XM91-150*350 XM91-150*400 XM91-150*450 XM91-200*400 |
| Working face sizes | 175x100mm 250x125mm 150x150mm 300x150mm 350x150mm 400x150mm 450x150mm 400x200mm |
| Height | 45mm on all listed sizes |
| Polar distance | 1.5+0.5mm |
| Magnetism | 100 N/cm2 or more |
| Net weight | 6kg to 28kg according to size |
| Power supply | None required permanent magnetic |
Figures above are taken from the product information we hold. Send us your application and we will confirm the exact specification for the model quoted.
How It Is Built and What Can Be Changed
Operations Performed
- Surface grinding
- EDM workholding
- Cutting
Quality Control
- Magnetism checked against the 100 N/cm2 figure on each chuck
- Working face ground and checked for flatness
- Polar distance verified against the 1.5+0.5mm specification
- Magnetise and demagnetise lever tested through repeated cycles
Customisation Options
- Chuck size chosen from 175x100mm up to 400x200mm and above
- Mounting and location arrangement prepared for your grinder table
- Back stops and side fences quoted where the work needs them
- Packing and marking prepared to your requirement
How It Compares With the Alternatives
| Magnetic lathe chuck | The round magnetic lathe chuck is rated up to 180 N/cm2 for lathe and cylindrical grinding; the XM91 is rectangular with dense poles for flat grinder tables and thin small parts |
|---|---|
| Coarse pole magnetic chuck | A coarse pole chuck grips larger parts well but cannot hold small thin work because too few poles make contact; the 1.5+0.5mm pitch of the XM91 keeps the grip on small pieces |
| Clamping with a vise or clamps on the grinder table | Clamping bends thin parts and obstructs the wheel; the magnetic chuck holds the part flat with the whole top surface clear |
Running the Machine
Step 1
Clean the chuck face and the underside of the part before loading
Step 2
Place the part on the chuck and fit back stops where grinding forces would push it
Step 3
Switch the magnet on with the lever and check the part cannot be moved by hand
Step 4
Take light grinding passes on thin work so the part is not pushed off the poles
Step 5
Release the magnet with the lever before lifting the part
Step 6
Demagnetise the finished part where residual magnetism would attract swarf
Step 7
Keep the chuck face free of debris and dress it when it loses flatness
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Questions About XM91 Dense Pole Magnetic Chuck for Grinding
Which size should I order?
Choose by your grinder table. The listed sizes run from 175x100mm to 400x200mm and above, all at 45mm height, with weights from 6kg to 28kg. Send us your table size and we will confirm.
How strong is the hold?
Magnetism is 100 N/cm2 or more. Actual holding depends on the part contact area, its thickness and its surface finish.
Why dense poles?
A close polar distance of 1.5+0.5mm means more poles under a small part, so the magnetism is uniform and thin small workpieces are held securely.
Does it need electricity?
No. It is a permanent magnetic chuck switched by lever, so there is no supply to run and no heating that would affect accuracy.
What can it hold?
Magnetic materials such as steel and cast iron. Non-magnetic materials such as aluminium, brass and non-magnetic stainless grades cannot be held this way.
Can it be used on an EDM machine?
Yes. It is suitable for flat grinding machines, spark machines and cutting machines.
What are your payment and trade terms?
FOB CFR and CIF. Payment is 30 percent by T/T on order and 70 percent before shipment, or an irrevocable L/C at sight.
Request a Quote on the XM91 Dense Pole Magnetic Chuck for Grinding
Send us the work you need it to do, the voltage on your site and the port you ship to. We will come back with the model, the tooling and the lead time.