SG7MTS – MANUALMATIC Cylinder Head Seat and Guide Machine

Rottler SG7MTS MANUALMATIC Cylinder Head Valve Seat and Guide Machine.

General Details
Rottler’s SG7MTS model is the most reliable and economical Cylinder Head Seat & Guide Machine on the market today. The SG7mts features Rottler’s trademark CONCEN that guarantees you get the most accurate and versatile machine possible. Rottler combines precision carbide centering pilots with a light weight air float workhead to give you perfect centering with the valve guide – every time. This guarantees the best CONCEN of valve seat to valve guide centerline in the industry.
  • Seat & Guide Machining
  • Cylinder Head Shop
  • Diesel Rebuilder
  • Engine Building
  • Jobber Shop
  • Motorcycle Engine
  • Performance Racing
  • Small Engines
  • Vintage Engine Rebuilding


  • Concentricity – Rottler’s Rigid Precision carbide centering pilots are manufactured to less than one tenth tolerance. Combined with the light weight air float workhead the SG7 gives perfect centering in the valve guide and the best concentricity of any machine on the market.
  • Built in Vacuum Tester for quick checking of valve seats before removing the cylinder head.
  • Storage Cabinet – Three drawers and top tray allows convenient storage of wide selection of tooling available from Rottler.
  • 360 Degree Rollover Fixture – Provides quick loading and easy access to all sides of the head. Quickly levels head using the micro adjust feature. Fixture bolts down firmly with quick release handles. Clamps onto table firmly for chatter free cutting with extremely accurate concentricity.
  • Rigid Machine Construction – Heavy thick wall cast iron machine castings and precision machining during the manufacturing process give excellent chatter free valve seat cutting. Heavy duty cabinet/base extended to the rear for safe handling when machine has to be moved. Recessed toe kick allows more comfortable machine operation.
  • Light Weight Workhead – The SG7 has a light weight workhead for extremely fast and accurate centering for the ultimate minimum concentricity. Outer spindle support bearings are adjustable over the whole length of the bearing area, similar to High Precision Boring Bar design.
  • Variable Speed Spindle from 40 to 400 rpm – Accurately select specific spindle speeds required for different machining operations. Soft touch buttons and bright digital display allow ease of operation.
  • Electronic Level – Digital readout for quick, accurate adjustment.
  • Depth Indicator – Shows the operator exactly how much has been removed from the seat assuring consistent seat depth. Also useful for installing seat rings, reducing valve guides, facing spring seats, etc.
  • Adjustable Depth Stop
  • Dual Speed Spindle Feed – Large handwheel provides rapid feed and small handwheel allows precise fine feed control of the spindle. Very helpful when depth of cut must be maintained to extreme levels of accuracy.
  • 15 Degrees Tilt – Spindle tilts up to 15 degrees from vertical in both directions , providing quick alignment on all canted valve cylinder heads. Cuts each seat to the exact same depth – a must for today’s computer controlled engines.
  • Spindle Nut – Offers quick tooling change for a wide selection of tooling and spindle adapters.
  • Rottler Patented Tooling – Rottler’s patented SG tooling totally eliminates any bounce springs. The quick change spherical spindle adapter allows different tool holders to be changed in a few seconds, change from multi angle seat cutting to pocket boring or reaming in just a few seconds! When the collar is moved down it aligns the tool holder vertically to allow the tool holder to be easily lowered down over the fixed pilot. While the tool holder is being lowered, the collar is lifted to release the sphere for precision centering and cutting. One hand pilot removal wrench allows fixed pilots to be moved from guide to guide – fast and easily.


With the Rottler SG7MTS you can accurately select specific spindle speeds required for different machining operations. The bright touch screen digital display allow ease of operations. With Rottler’s Dual Speed Spindle Feed you can use the steering wheel to provide rapid feed and the small handwheel for precise find feed control of the spindle. The Air Float Work Head utilizes foot pedal control. The 360 Degree Rollover fixture provides quick loading and easy access to all sides of the head.
Standard Equipment
  • The Standard Control has 2 modes of operation:
    1. MANUALMATIC Touch Screen Control for increased production
    2. MANUAL Touch Screen Control for simple manual operation
  • Operations such as valve guide reaming, drilling and tapping are included
  • LightWeight Air Float Work Head for precise centering
  • Universal Bolt Down 360 degree Roll Over Cylinder Head Fixture
  • Holder Kit for heads that Roll Over Fixture is not able to clamp – two piece frame – adjustable for different length heads
  • Maximum Cylinder Head Length in 360 degree Roll Over Fixture – 28″ (700mm) adjustable to 32″ (800mm)
  • Rottler R1 Taper 2.25″ (58mm) Hardened and Ground Spindle with 8″ (200mm) of hand wheel travel
  • Spindle Rotation Speed Infinitely Variable from 40-400RPM with AC Motor and Vector Drive
  • Quick change of Spindle RPM from High to Low for fine finishing of the valve seat
  • Quick Change Tool Retention System for fast location over pilot and accurate centering (Patented)
  • Steering Wheel for Rapid and Fine Spindle Feed for Precise Valve Seat Depth and Finish
  • Work head tilts 15-degrees in both directions for Canted Valve Guides
  • 2 LED Work lights – either side of the spindle giving shadowless view of valve seat area
  • Tool Storage Cabinet with three drawers, mounts on the machine and swivels for ease of use
  • Digital Electronic Level for quick, precise alignment of Fixed Carbide Pilots
  • Digital Display for repeatable Depth Control of Spindle Travel
  • Built in Vacuum Tester complete, Kit includes hose and quick change pads
  • Space requirement with Tool Cabinet mounted: 52 X 34 X 78″ H (1321 X 864 X 1981mm)
  • Paint Color Code: RAL9002 (Grey White)
SG7MTS Machine Specifications





Machine Weight

1800 lbs

818 kg

Travel – Spindle Nose to Table

18.625″ – “

473 – mm

Spindle – Taper

R30 Quick Change with Automatic Lock

Spindle – Diameter



Spindle – Rotation Speed

40 to 400 RPM

Spindle – Motor

3/4 HP

0.56 Kw

Valve Seat Diameter Range



Cylinder Head Dimensions (with 360 degree rollover fixture)

31L x 9W x 6H

787L x 230W x 150Hmm

Cylinder Head Dimensions (with Diesel Fixture)

37.5L x 12W”

950L x 305Wmm

Spindle Travel/Stroke Vertical



Workhead Travel Horizontal – Airfloat/Airclamp



Workhead Travel In/Out – Airfloat/Airclamp



Workhead Tilt (either side of vertical zero)

15 Degrees

Roll Fixture Movement In/Out with Clamp



Dimensions – Machine

32D x 38W x 72″ H

813D x 965W x 1829mm H

Dimensions – Shipping

37D x 49W x 83″ H

940D x 1245W x 2108mm H

Electrical Requirements

208-240V, 15A, 50/60Hz, 1Ph

Air Requirements

cfm @ 90 psi

l/min @ 6 bar

Paint Color Code

RAL9002 (Grey White)

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