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Valve seat grinding machines PEG: the different models

Valve seats grinding machine peg 8-10-90-125-175

Valve seat grinding machines PEG: the different models

In this article we will see the various versions that make up the wide range of PEG orbital valve seats grinders.
Let’s start by presenting the different models that are part of the Peg valve seat grinding machine series which are as follows:

In turn, some of these models can be supplied in different variants depending on the configuration and the accessories included in the machine.
The 4 variants in which the PEG valve seat grinding machine can be supplied are:

  • Standard
  • Univer
  • Motorized unit only
  • Avio

What differentiates the various versions is precisely the provision of grinding wheels and pilots that are supplied with the machine and we can summarize it as follows:

  • Standard: basic equipment of pilots and grinding wheels, dressing tool and accessories
  • Univer: complete equipment of pilots and grinding wheels, dressing tool and accessories
  • Motor unit only: no pilot, grinding wheel or dressing tool supplied with the machine
  • Avio: particular variant for machining valve seats of engines with blind cylinders. The Avio version is normally made on request, in accordance with the technical specifications requested by the customer.

Technical specifications and working range

Let’s now see in detail every single model of valve seat grinding machine that the PEG company offers, starting from the smallest to the largest model.

PEG 8 – Valve seat grinding machine

The valve seat grinding machine PEG 8 is the model for those who have to rectify valve seats of small engines such as motorcycles or cars.
Its working range in fact covers a diameter range of Ø 16 ÷ 48 mm.
It is only available in the Standard, Univer, Motorized Unit Only and Avio versions.

Working field Ø 16÷48 mm
Grinding wheel rotation speed 13000 Rpm
Relative motion 30 Rpm
Fixed eccentricity 1,5 mm
Motor power 250 W
PEG 8 valve seats grinding machine
PEG 8

PEG 10 – Valve seat grinding machine

The PEG 10 is suitable for machining valve seats on medium engines such as cars, vans and trucks.
Its working range is between Ø 20÷65 mm.
It is available in the Standard, Univer, Motorized Unit Only and Avio versions.

Working field Ø 20÷65 mm
Grinding wheel rotation speed 11000 Rpm
Relative motion 27 Rpm
Fixed eccentricity 2,5 mm
Motor power 350 W
PEG 10 valve seats grinding machine
PEG 10

PEG 90 – Valve seat grinding machine

The PEG 90 finds its best field of application in medium-large size engines, such as those of caterpillar, tracked or articulated vehicles.
It has a range of work that is around Ø 40÷90 mm.
It is available in the Standard, Univer, Motorized Unit Only and Avio versions.

Working field Ø 40÷90 mm
Grinding wheel rotation speed 8000 Rpm
Relative motion 18 Rpm
Fixed eccentricity 3 mm
Motor power 600 W
PEG 90 valve seats grinding machine
PEG 90

PEG 125 – Valve seat grinding machine

The PEG 125 valve seat grinding machine is suitable for those who have to work large engines such as those of small boats or locomotives.
Its working range is from Ø 50÷120 mm.
It is available in the Standard and Motorized Unit Only versions.

Working field Ø 50÷120 mm
Grinding wheel rotation speed 5500 Rpm
Relative motion 12 Rpm
Fixed eccentricity 3 mm
Motor power 600 W
PEG 125 valve seats grinding machine
PEG 125

PEG 175 – Valve seat grinding machine

The PEG 175 is the largest model in the range and in fact lends itself well to very large engines used especially in the naval sector.
Its working range is between Ø 120÷180 mm.
It is supplied in the Standard version and also offers the possibility of adding the speed variator.

Working field Ø 120÷180 mm
Grinding wheel rotation speed 2800÷5600 Rpm
Relative motion 8÷16 Rpm
Fixed eccentricity 3 mm
Motor power 1300 W
PEG 175 valve seats grinding machine
PEG 175

Summary table

To help readers in choosing the PEG valve seat grinding machine that best suits their working needs, we have decided to enclose all the different models and their versions in a summary table that you can find below.

PEG 8 PEG 10 PEG 90 PEG 125 PEG 175
STANDARD
UNIVER
MOTOR UNIT ONLY
AVIO
Ø 16÷48 mm Ø 20÷65 mm Ø 40÷90 mm Ø 50÷120 mm Ø 120÷180 mm
Rettifica sedi valvole per moto Rettifica sedi valvole per veicoli Rettifica sedi valvole per automobile Rettifica sedi valvole per furgone Rettifica sedi valvole per truck Rettifica sedi valvole per Locomotore Rettifica sedi valvole per nave

Centering pilots, grinding wheels and wheel grinding dresser

As mentioned, except for the Motorized Unit Only variant, all PEG grinders are supplied with their own series of grinding wheels, centering pilots and wheel dressing dresser.

Centering pilots

The series of centering pilots is quite large and ranges from smaller diameters such as Ø 4 – 4.5 – 5 mm up to Ø 20 mm.
All the most commonly used inch versions are also available, such as Ø 7⁄32 “- 3⁄8” – 5⁄16 “up to 1⁄2”.
PEG offers its customers the opportunity to make custom-made pilots according to specific needs.

Centering pilots for valve seats
Centering pilots for valve seat grinders in various diameters and lengths

Grinding wheels

The entire range of grinding wheels that PEG has for its machines is very large, and includes diameters ranging from Ø 18 to 120 millimeters and more.
All the grinding wheels can also vary according to the abrasive grain, depending on the material to be worked.
In this case, in addition to the abrasive material, the grinding wheels differ in color and are:

  • Silicon carbide – Gray
  • Silicon carbide – White
  • Corundum – Red
  • Cubitron – Blue
Grinding wheels for valve seats grinding machine
Grinding wheels for valve seats in various diameters and abrasive materials

Grinding wheel dressing tool

The wheel dressing device with diamond dressing tool is available in the Standard and Univer kits, and can also be sold individually.
This tool allows to revive the grinding surface, but it is also used to set the angle to the profile of the grinding wheel.
In the dressing device there is a protractor that allows you to set any angle, even if the most used are those at 30° and 45°.

Comment and share

We end this detailed overview of the different models and versions of the valve seat grinding machine PEG, remaining available for any type of technical or commercial information.
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About the author

Grown up working in Comec, he’s every since introduced in automotive business. Today he collaborates with with various companies in the industry as Area Manager and Marketing Manager. He’s also the promoter of The Ultimate Tooling project that he personally follows. 

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