GRMA GRMB Series · R087
Long Reach Corner Radius End Mills for Graphite
When a graphite electrode has a recessed feature with a specified corner radius, the cutting profile and tool clearance both matter. Compare AXIMET’s GRMA and GRMB models by cutter diameter, corner radius and effective length before selecting the tool for your order.
- Two- and four-flute options in the listed GRMA and GRMB range
- Corner radius and effective length recorded by model
- Dimensions for checking access, holder fit and part geometry
Reach the Feature with the Required Corner Profile
A long-reach corner radius end mill combines a radiused cutting corner with a neck geometry intended to reach a recessed feature. Use the part drawing to determine the radius and required depth, then compare the catalogue drawing and model row with the available space.
- Corner radius: check the radius specified for the feature.
- Effective length: compare the catalogue dimension with the access requirement.
- Complete assembly: check the neck, holder and fixture clearance along the toolpath.
GRMA and GRMB Series
The catalogue lists 26 GRMA and GRMB model records. The listed GRMA models have two flutes; the listed GRMB models have four. Compare the cutting diameter, corner radius, flute length, effective length, overall length and shank diameter on the individual row before quoting.
Models with the same cutter diameter can have different corner radii or effective lengths. Do not substitute one for another without checking the component drawing and the intended holder. For a mixed assortment, list each complete model code and quantity separately.
For example, GRMA100601A and GRMA100801A have the same listed cutting diameter, corner radius and flute length, but different effective lengths. Check the drawing and holder clearance before choosing between them.
Check the Feature Before You Select Reach
Begin with the required depth, opening and sidewall geometry. A tool can have sufficient overall length but still interfere with the workpiece or holder at the entrance. Check clearance over the whole path, including the deepest point and any nearby walls or fixtures.
The catalogue identifies flute length (Lc), effective length (L1) and overall length (L) as separate dimensions. Flute length refers to the fluted cutting section. Effective length follows the reference points shown on the drawing; it is not automatically the length of cutting edge. Overall length is the entire tool, and does not by itself establish usable reach.
Where more than one length can access the feature, consider the shortest suitable projection for the intended operation. Share the cavity section and holder arrangement if clearance is difficult to establish from a model table alone.
Select the Corner Radius for the Part
A corner radius tool has a radius at the outer corner of its cutting end. It differs from a ball-nose end mill, whose rounded profile extends across the end. A matching diameter does not mean the two profiles will produce the same feature.
For a graphite electrode step or recessed transition, compare the cutter radius to the part’s specified geometry and the programmed path. If the component calls for a sharp internal corner, check whether the selected radius is acceptable or whether a separate operation is needed. For standard-access work, compare reach and dimensions with the standard graphite corner-radius range. For rounded contours, compare the graphite ball-nose range instead of substituting based on diameter alone.
Prepare Your Purchase and Trial Order
Provide the GRMA or GRMB model, quantity per item, graphite application, feature depth, holder and machine details. Include the part drawing and any requirements for samples, packing, labels or documentation. For a repeat order, keep the approved model and drawing revision on the purchase record.
Identify the dimensions and edge features important to sample acceptance. Review tool fit in the intended holder and machining setup. Graphite dust should be managed using extraction and handling arrangements appropriate for the machine and facility.
Catalog Series, Product Views and Dimension Drawings
Catalog Model Specifications
Use the GRMA and GRMB rows to select a cutter diameter and corner radius, then compare the drawing with the required reach.
GRMA GRMB · R087 · 2/4 FLUTES
| Type No. | Diameter (D, mm) | Corner R (R, mm) | Flute length (Lc, mm) | Effective length (L1, mm) | Overall length (L, mm) | Shank Dia (d, mm) | Flutes (F) |
|---|---|---|---|---|---|---|---|
| GRMA100601A | D1 | R0.1 | 3 | 6 | L60 | 4 | 2 |
| GRMA100801A | D1 | R0.1 | 3 | 8 | L60 | 4 | 2 |
| GRMA101001A | D1 | R0.1 | 3 | 10 | L60 | 4 | 2 |
| GRMA101201A | D1 | R0.1 | 3 | 12 | L60 | 4 | 2 |
| GRMA150601A | D1.5 | R0.1 | 4.5 | 6 | L60 | 4 | 2 |
| GRMA151001A | D1.5 | R0.1 | 4.5 | 10 | L60 | 4 | 2 |
| GRMA151601A | D1.5 | R0.1 | 4.5 | 16 | L60 | 4 | 2 |
| GRMA152001A | D1.5 | R0.1 | 4.5 | 20 | L60 | 4 | 2 |
| GRMB200801A | D2 | R0.1 | 6 | 8 | L60 | 4 | 4 |
| GRMB201201A | D2 | R0.1 | 6 | 12 | L60 | 4 | 4 |
| GRMB201601A | D2 | R0.1 | 6 | 16 | L60 | 4 | 4 |
| GRMB202001A | D2 | R0.1 | 6 | 20 | L60 | 4 | 4 |
| GRMB301502A | D3 | R0.2 | 9 | 15 | L60 | 4 | 4 |
| GRMB302002A | D3 | R0.2 | 9 | 20 | L60 | 4 | 4 |
| GRMB303002A | D3 | R0.2 | 9 | 30 | L60 | 4 | 4 |
| GRMB301505A | D3 | R0.5 | 9 | 15 | L60 | 4 | 4 |
| GRMB302005A | D3 | R0.5 | 9 | 20 | L60 | 4 | 4 |
| GRMB303005A | D3 | R0.5 | 9 | 30 | L60 | 4 | 4 |
| GRMB401502 | D4 | R0.2 | 12 | 15 | L75 | 6 | 4 |
| GRMB402002 | D4 | R0.2 | 12 | 20 | L75 | 6 | 4 |
| GRMB402502 | D4 | R0.2 | 12 | 25 | L75 | 6 | 4 |
| GRMB403002 | D4 | R0.2 | 12 | 30 | L75 | 6 | 4 |
| GRMB401505 | D4 | R0.5 | 12 | 15 | L75 | 6 | 4 |
| GRMB402005 | D4 | R0.5 | 12 | 20 | L75 | 6 | 4 |
| GRMB402505 | D4 | R0.5 | 12 | 25 | L75 | 6 | 4 |
| GRMB403005 | D4 | R0.5 | 12 | 30 | L75 | 6 | 4 |
Production Equipment Reference
The photographs below show production equipment and workshop operations used as manufacturing-reference material for carbide tooling enquiries. Process requirements are confirmed for the selected model and order.
Enclosed CNC tool-grinding equipment shown on the workshop floor.
Multi-tank cleaning equipment shown in the workshop.
A row of enclosed CNC grinding machines viewed from the workshop aisle.
Enclosed tool-grinding equipment with an adjacent operator area.
Tool-grinding equipment with a robotic handling enclosure.
Enclosed grinding and robotic-handling equipment shown from another workshop position.
CNC grinding machines arranged along a workshop aisle.
Enclosed tool-coating equipment shown in the production area.
Vacuum-chamber equipment shown in the coating area.
An operator works at an enclosed laser-marking station.
Machine workstations shown in a tool-finishing area.
An operator stands beside tool honing and polishing equipment.
An operator stands beside enclosed edge-honing and polishing equipment.
Enclosed wet-blasting equipment shown in the surface-finishing area.
A second workshop view of enclosed wet-blasting equipment.
Inspection and Measurement Equipment Reference
The photographs below show inspection and measurement equipment used when discussing drawing dimensions and order requirements. The inspection scope is confirmed for the selected order.
Operators work at optical inspection stations.
An operator positions a cutting tool at a profile-measuring station.
Optical measurement workstations shown in the inspection area.
A balancing instrument with a protective enclosure.
A tool presetting station with an optical measuring arm and display.
An optical tool presetter with a measurement display.
Operators inspect tools at camera-based optical workstations.
An operator positions a tool in an enclosed measuring machine.
Frequently Asked Questions
What is a long reach corner radius end mill for graphite used for?
It is considered for graphite features requiring both a radiused cutting corner and access into a recessed area. The chosen model must match the part geometry and setup.
How is it different from a ball-nose graphite end mill?
The corner-radius tool has a radius at the outer corner of its cutting end; a ball-nose tool has a rounded end profile. Compare the toolpath and required feature before substituting one.
Does effective length mean cutting length?
No. The catalogue shows effective length and flute length separately. Use the dimension drawing to identify each reference and check access along the full assembly.
Which GRMA or GRMB model should I order?
Start with the part’s diameter and corner-radius needs, then compare flute length, effective length and shank diameter on each model row. Include the drawing and machine setup in your inquiry.
Is the longest reach always the best choice?
No. Choose enough reach to clear the feature and fixture; unnecessary projection can change the setup’s rigidity. Check the tool and holder as an assembly.
What should a graphite tool distributor specify for GRMA or GRMB?
Send the GRMA or GRMB model and quantity, the required cutter diameter and corner radius, and the graphite feature drawing. Include the holder and any sample, identification or packing requirements relevant to the order.
Request a Quote for Long Reach Corner Radius End Mills for Graphite
Share your GRMA or GRMB model numbers, quantities, cutting diameter, corner radius and required reach. Feature dimensions and holder details help us review access before quoting.