Centroid Performance Racing

Centroid Performance Racing

The world's #1 choice for performance racing machine tools

B4250 CNC Engine Block Machining Center

B4250 4-Axis CNC Engine Block Machining Center

Flexible fixture and software allows for easy machining of any block

Discover the CENTROID advantage with the B4250: we provide the machine, tooling, software, and personalized on-site training you need to blueprint, machine, and rebuild engine blocks. In addition to the included ready-to-run block programs, our conversational software gives you the power and flexibility to easily add new engine blocks and operations, so you'll never need to purchase additional programs or edit G-code. CENTROID puts you in control of your shop!

Now you can 5-axis port cylinder heads on the same machine: check out the A532-PB!

Quick links: B4250 Brochure (PDF) | Request a quote or in-person demo | Find your local representative

CNC engine block cylinder boring

B4250 Turnkey Package Includes:

  • 4-axis machining center
  • M400 CNC control
  • Universal block fixture
  • Conversational block software
  • On-site personalized training
  • Standard tooling package
  • Digitizing probe
  • Auto tool length setter
  • 24-tool automatic tool changer (ATC)
  • MPG electronic handwheel
  • Industry's best warranty & support

The B4250 is a complete turn-key CNC engine block machining package. We supply the accessories, tooling and the training so you will be blueprinting and machining blocks in no time.

The B4250 will CNC blueprint an engine block faster and more accurately than the competition. Equipped with a 24 tool automatic swing arm tool changer, CENTROID has made advancements to the machine, the block fixturing and the CNC control that allow you to produce accurate race winning cylinder blocks quickly and easily.

The CENTROID patented digitizing probe will automatically determine the location, diameter and angle of any feature on the block. CENTROID's easy preprogrammed conversational cycles take the hassle out of programming. No G code experience necessary. The actual cnc blue print information is displayed on the screen beside the factory information. Both a table and a graphic display shows the operator the differences, choose to make the appropriate adjustments and then automatically CNC machine the block to the new specifications.

Machine a block and CNC port heads with the same machine!

Now you can have the best of both! The B4250 is also available as the A532-PB, with both the universal block fixture and the cylinder head machining fixtures! Port heads in the morning and Blueprint Blocks in the afternoon. Save space, save money, and do it all with the CENTROID A532-PB.

Included standard tooling package

Included Standard Tooling Package

CENTROID includes a high quality tooling package with each machine to get you up and running quickly!

  • Cylinder boring tool
  • Tool setting micrometer
  • 12" deck surfacing tool
  • Lifter boring tool
  • Lifter spot-facing tool
  • Cylinder chamfering tool
  • Main cap conversion tooling
  • Digitizing probe and stylus






CNC Block Blueprinting with the DP4 touch probe

Automatic CNC Block Blueprinting: CNC Probing

Blueprinting any block begins by making very accurate measurements of the existing features so corrections can be made. The old way of laborious manual measurement has been eliminated. The CENTROID B4250 CNC Block machine is equipped with a high tech digitizing probe which automatically locates and measure cylinder bores (diameters, locations and angles), deck heights, and lifter bores with our exclusive easy to use block specific conversational software. To measure an entire block, simply choose the features to blueprint and the probe automatically measures the block and displays the actual diameters and positions of the cylinder bores (and other features) and compares it to the factory specs. The operator then chooses to make any modifications necessary.

The CENTROID DP-4 Probe is a state of the art, made-in-USA highly precise probe which can detect in all axis and directions. Since the probe is made by CENTROID the entire probing system is integrated and streamlined into the CNC machine, making block digitizing and probing a quick and simple process. Much more accurate, faster and repeatable than manually blueprinting a block!

Cylinder Boring

CNC Engine Block Cylinder Boring

Automatic Boring cycles are pre programmed and are menu driven with a simple fill-in-the-blank format. 360 degree CNC rotary axis will position the block at the exact blueprint angle automatically. Machine both cylinder banks with the same setup. Block database saves your work for future jobs. Bore on probed centers, blueprint, or any other specified location. Specialized boring tooling included. Quick, simple programming gets the job done accurately the first time. Operators program the block work to be done right at the machine.

Deck Surfacing with the CENTROID Flycutter

CNC Engine Block Surfacing

With a quick push button tool change the machine will surface the block to the exact deck height specified. The probe automatically detects the block existing surface height at multiple locations so the operator can choose the proper surface depth to machine to for a perfectly flat and square deck to the cylinder bore. Specialized CNC block surfacing tooling is included which produces incredibly smooth surfaces for superior gasket performance.

Lifter Bore Spot Facing

CNC Spot Facing

Spot Face Lifter bores automatically. You have the ability to create and save your programs with CENTROID user friendly CNC Block software. No need to go out of house or learn G codes, our easy to learn Block Software is made specifically for engine builders saving you time.

Lifter Boring

CNC Lifter Bore Machining

Machine lifter bores to the exact diameter, location and angle needed with one simple setup. True up the stock size and location or bore complete new diameter, location or angle. Easily control feed and speed within the CENTROID conversational software, the computer remembers your data for the next job as well, no need to reprogram. Easy manual override of programmed feeds and speeds via the operator control panel makes fine tuning adjustments easy to do on the fly.

Main Bearing Cap Conversion

4-Bolt Main Bearing Cap Conversion

The best way to accurately convert a block to 4 bolt mains. Automatic CNC drill and tap routines are pre programmed, the operator simply answers a few questions and the machine does the rest. CNC Angle Drilling and tapping for perfect 4 bolt main conversions.

Cylinder Bore Chamfering

Cylinder Bore Chamfering

Chamfer cylinder bores automatically. Operators specifies amount of chamfer. Machine chamfers perfectly concentric with bore.

O-Ring Grooving

O-Ring Grooving*

Add o-ring grooves the the deck of any block. Any width and any depth, operator specifies oring specs and the machine does the rest.

* O-ring tooling is optional.

Grid digitizing a block face to create the profile

CNC Block Lightening

Automatically remove excess material. The probe copies the shape of the block and creates a tool path that perfectly matches the contour of every detail.

Choose the amount of material to remove, press cycle start, and the tool will machine the block surface to your specs.

Arrow

A specified amount of material can be removed.

Engrave letters, numbers, and logos.

CNC Engine Block Engraving

Quickly and easily engrave letters, numbers, symbols and logos. Phone numbers, serial numbers, web addresses and company logos are now simple to automatically add onto every block you blueprint.

B4250 Engine Block Machine Footprint

Machine Specifications

Table Size 18" x 56" (457 x 1422mm)
Longitudinal travel (X) 41" (1041mm)
Cross travel (Y) 21" (533mm)
Vertical travel (Z) 34" (863mm)
Spindle nose to table top 39" (990mm)
Spindle center to column 22" (659mm)
Maximum table load 2420lbs (1100kg)
Spindle power 10Hp / 7.5kw
Optional: 15 or 20HP dual vector drive spindle
Spindle taper CAT40 / BT40
Spindle speed 6000 RPM
Optional: 8000 RPM spindle with chiller
Automatic tool changer (ATC) 24-position swing arm
Rapid feed rates (X,Y,Z) X-400, Y-400, Z-350 IPM
Accuracy 0.0005" (0.0127mm)
Repeatability 0.0002" (0.0060mm)
Axis drive motors (X,Y,Z) 1kw AC Brushless Servos
Coolant pump 1/8HP 55 Gallon Capacity
Auto lubrication pump 105W 1.75 Liter Capacity
Power requirement 14kVA, 50-60Hz, 208-240v, 3-Phase
Air requirement 90-100 PSI (6.2-6.8 Bar)
Other Options Through-spindle coolant (TSC)
Chip augers
Boring diameter range* 0.984" - 1.26" (25-32mm)*,
2.68" - 5.91" (68-151mm)*
Boring depth (max)* 9.5" (242mm)*
Milling width (max)* 12" (305mm)*
  * as equipped with standard tooling

Machine Footprint

Length 134" (3404mm)
Width 92" (2337mm)
Max. Height 123" (3124mm)

Shipping Footprint

Length 88" (2235mm)
Width 96" (2438mm)
Height 98" (2490mm)

Weight

Machine 10,077lbs (4,570kg)
Fixture 612lbs (278kg)

Machine Features:

  • 10 Hp Spindle motor w/Hi-Lo range
  • Laser calibrated for high accuracy
  • C3 double nut ballscrews
  • 4 box way on Y axis
  • Hardened & Ground TurciteB Guideways
  • FC30 Meehanite Casting Stress relieved
  • Auto Tool Coolant system
  • Telescopic steel way covers
  • Auto central lubrication system

B4250 open machine configuration

Open machine configuration also available

The CENTROID CNC Engine Block machine is also available in an open frame design. With or without the automatic tool changer. Includes all the machining features of the enclosed model.

Both models are equipped with the following capabilities yet not limited to: Automatic CNC Blueprinting, Boring (rough and finish), Surfacing, Lifter boring and facing, Engraving, Block digitizing and material removal for block lightening, Auto probing finds any and all dimensional data, O-ring grooves, push rod clearance machining, stroker rod clearance machining, drilling and rigid tapping, 4 bolt main conversions, splayed caps, chamfering, shell milling and any general 3 or 4 axis machining work including 3D digitizing!

Related videos:

CNC head porting and block blueprinting on the same machine!

CNC Cylinder Head Porting AND CNC Block Blueprinting and Machining on the Same Machine!

CENTROID's flagship A532-PB: save space and money at the same time with one machine that can do it all! Combines the proven A532 5-axis cylinder head porting machine, the B4250 engine block machine, and a fully capable machining center in one affordable package. Port heads in the morning and blueprint and machine blocks in the afternoon!

PRI '09 Video

CENTROID Demonstrates Automotive Engine CNC Machine Tools at PRI '09

If you didn't get a chance to make it to the 2009 Performance Racing Industry Trade Show in Orlando FL, check out what you missed in this video of the action at the show. A great introduction to the complete CENTROID machine tool line-up!

CENTROID M400 CNC Control with Block Interface

CENTROID M400 Conversational CNC Control

Our CNC Block conversational software is a integrated part of the control system. This quick and simple to use Block specific software guides you thru the process with graphics and a simple fill in the blank format. Our Block blueprint data base is standard and expandable, nothing extra to buy. Operators can easily add their own work to the data base. The control remembers all your data and programs. Easy transfer to a USB thumb drive for backup & safe keeping, USB 2.0 ports are a standard feature of the PC based CENTROID cnc control along with a robust solid state hard drive made for harsh environments for reliable operation for years to come.

A large color LCD screen with an anti glare layer makes the control easy on the eyes, grease and chip proof. The operator control panel has dedicated buttons for common machine functions that makes the control simple and intuitive to use. The included electronic remote hand wheel makes block setups quick, accurate and easy. Simply turn the dial to move a machine axis, a selection of increments on the dial allows fine adjustments. The control stand itself allows and operator to stand or sit with a comfortable working position.

The CENTROID M400 CNC control is a full function 4-Axis CNC that has additional built in conversational pre programmed canned cycles for everyday machining tasks, such as automatic pocketing (circular, rectangular, irregular with cleanout), drilling cycles( peck drilling, deep hole and regular), Tapping (compression, reversing and Rigid! w/ special deep tap cycles), Frame milling, Engraving, Lines, Arcs, repeat, rotate, mirror, depth repeat and much more... In addition to the extensive conversational software the CENTROID M400 is a G and M code CNC control which uses industry standard G codes so you can use any CAD/CAM system to program a part.