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Rottler HP7A HP7A Diamond Cylinder Hone

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The new Rottler HP7A Cylinder Honing Machine employs the latest technology available for today’s engine builder. The bright, user friendly, full color 10" (254mm) Windows Touch Screen Control makes honing faster, easier and more accurate than ever before. Rottler Manufacturing continues a lasting tradition of introducing state of the art machine shop equipment for the engine builder. Quality, service, and technical support is built into every Rottler machine.

The bottom line is greater control and efficiency with increased profits for today’s machine shop.

Machine Operations
  • Cylinder Honing
  • Liner Honing
Applicable Industries
  • Diesel Rebuilder
  • Engine Building
  • Heavy Duty
  • Jobber Shop
  • Performance Racing
  • Remanufacturing
  • Small Engines
  • Vintage Engine Rebuilding


Touch Screen Controls The HP7A boasts a full color, easy to read, 10" (254mm) Windows Touch Screen control that simplifies all aspects of honing. The computer automatically senses tight areas and actuates short stroke or dwell as required.

Automatic Load Control A must for diamond cylinder honing. Allows for faster
honing without bore distortion. Program the desired roughing and finishing loads and walk away! Without automatic pressure control, machine will continue to build pressure on cylinder walls when honing with diamonds causing bore distortion. The Rottler system controls stone pressure on cylinder walls thus reducing bore distortion and decreasing honing time.

Pneumatic Lock The hone head locks pneumatically with no handles.

Automatic Plateau Finish Cycle The HP7A computer has a program specifically for Plateau Finishing of cylinders. By counting the number of strokes with a light stone pressure, this automatic cycle guarantees the same exact finish hole after hole, block after block.

Linear Slideways Hardened steel precision ground linear roller bearing slideways reduce operator fatigue and produce no friction and long life.

Bore Profile The convenient, easy to read digital bore profile display allows you to  visualize the geometry of the bore while honing.

Simple Stroke Setting A thumb operated button locks the stroke position at the top of the cylinder to be honed. The lower stop can be adjusted while the machine is in operation to maximize stroking for blind hole honing.

Two Stage Auto Cycle The HP7A features a programmable roughing and finish cycle. This gives you greater control, allowing the machine to aggressively remove material in the roughing cycle, then switch to the finish cycle with a lighter stone pressure to finish the cylinder accurately with reduced stone load against cylinder wall In-Line and V-Block.

Fast Setup Both versatility and large capacity come together with the standard combination fixture. Securing blocks as well as single cylinders has never been easier. Any angle can be easily set (7.5, 15, 30, and 45 degrees).

Stainless Steel Doors Sliding stainless steel doors provide smooth movement and long life with wide opening for easy loading of blocks and cleaning of machine.

Rugged Design, Solid Construction Larger, heavy duty base increases the capacity of the machine and ensures a lifetime of rigidity and accuracy. Heavy duty industrial powder coating ensures a lifetime of rust free paint protection and easy cleaning.

Filtration System With increased coolant capacity to 75 (283 liters) gallons and a strong magnetic filter system, the coolant stays cleaner and cooler. Performance builders can use the optional two stage micron filter system to remove very small contaminants from the honing fluid.

Tooling for Tomorrows Standards Unmatched, proven performance is displayed by the superior accuracy of Rottler’s precision hone head. There is no other system that matches this in terms of flexibility and accuracy.

Water Based Coolant Water based coolant can be used with Rottler diamond honing stones, greatly reducing heat build up in the block during honing. Cost is substantially reduced over honing oils and block cleaning is almost eliminated. Disposal of used coolant is simplified as the water can be evaporated leaving only minimal condensed sludge for disposal – environmentally friendly.

International Language Touch Screen Computer Controls allow for easy translation into multiple languages.

Standard Equipment

  • 10" (254mm) Touch Screen Computer Controls
  • Bore Profile Display
  • Rottler Programmable Automatic Roughing and Finishing Load Sensing System
  • Rottler Automatic Feed-out System
  • Automatic Controlled Stock Removal with .0002" (.01mm) Resolution
  • Automatic Plateau Finish Program
  • Short Stroke or Dwell Finish Program
  • Infinitely Variable Stroke Speed Control
  • Infinitely Variable Spindle RPM Control
  • Combination Fixture for In-line and V-Blocks with support parallels
  • Stone Tray with Dial Bore Gage Holder
  • 75 gal (283liter) Coolant System with Magnetic Separation
  • Set Leveling Bolts
  • Instruction Manual


Rottler has been dedicated to the Engine Rebuilding industry since 1923 and has produced computer controlled machinery since the 1980s. We've used these years of experience combined with dedicated R&D and precision engineering to bring you the most advanced, easy to learn and operate touch screen controls available on the market today and into the future. This is the new standard in Diamond Honing.

Automatic Controls
The new Rottler HP7A control is the result of feed back from the market place of what is required and development by our team of technical and electronic experts. The new control is easy to understand and simple to use. The control handles a wide variety of precision bore finishing work - from automotive and diesel blocks to motorcycle, outboard marine, snowmobile, airplane, and industrial applications.

Program Select
With memory to store each job, operators can save programs to go back to without needing to re-enter any parameters. All settings for each block are saved under fully customized names for instant recall. Select any saved program from the startup screen and you're ready to start honing. This improves quality and consistency of the end users finished product.

Stroking System
The HP7A Stroking System changes direction instantly at top and bottom providing consistent cross hatch from the top to the bottom of the bore. Automatic Cross Hatch is simple to understand, automatically obtains any desired cross hatch angle and self adjusts automatically. There is no manual calculating. The Automatic Cross Hatch system is solution capable, simply enter the angle and the computer will maintain the angle from top to bottom of the cylinder.

The Key Features
There are several important features of the new Rottler HP7A computerized control which account for substantial improvements in accuracy and productivity.
  • The digital bore profile display projects an exact profile of the bore during honing.
  • The computer senses any taper and automatically dwells or short strokes - automatically correcting the tight area.
  • Two stage roughing and finishing cycle allows fast stock removal for roughing and light loads for finishing for productive and accurate cycles.
  • Infinitely variable hone head RPM allows high speeds for roughing and a slower speed for finishing giving the desired cross hatch angle and surface finish.
  • The finishing cycle operates much like a "spark out" system where there is very light stone load eliminating any distortion and resulting in accurate bore geometry and consistent surface finish.
  • Automatic Plateau Mode holds the stones at a preset load and counts down the number of strokes so that each cylinder has the same plateau surface finish.
  • Manual controls are available on the touch screen for fine adjusting settings during automatic cycles and R&D.


HP7A Machine Specifications American Metric
ControlTouch Screen
Touch Screen10"254mm
Machine Weight2300 lbs1045 kg
Travel - Horizontal (X Axis)40"1000mm
Spindle - Rotation Speed80 to 275 RPM
Spindle - Motor2 HP1.5 Kw
Coolant Capacity75 Gallons283 Liters
Hone Diameter Capacity Optional Range2.25" - 9.6" Diameter57.1 - 244mm Diameter
Power Stroke Length13"330mm
Maximum Length of Cylinder18"457mm
Stroking SpeedInfinitely Variable
Stroking DriveAir Hydraulic
Block Capacity55"1400mm
Coolant System Pump Motor1/15 HP 208/240 Volt Single Phase 50/60 Hz
Floor Space Required (with Standard Coolant Tank)72" x 72"1829 x 1829mm
Floor Space Required (with Optional Coolant Tank)84" x 60"2134 x 1524mm
Amp Draw20 Amps
Dimensions - Machine60D x 60W x 76" H 1524D x 1524W x 1930mm H
Dimensions - Shipping67D x 77W x 82" H 1702D x 1956W x 2083mm H
Electrical Requirements208-240V, A, 50/60Hz, 1Ph
Air Requirements5.7 cfm @ 100 psi l/min @ 6 bar
Paint Color CodeRAL9002 (Grey White)

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