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Marunaka   Supersurfacers

HomeUsed  SupersurfacersMarunaka  GrindersRebuilt Gallery

Watch my videos on YouTube: YouTube Channel

Unique machines for superfine finish planing of solid wood.

For information on blade setup and Chipbreaker research scroll to the bottom of the page.

 

 

Educational Video on "Influence of the Cap-iron on Hand Plane."

> Created by Professor Yasunori Kawai and Honorary Professor Chutaro

> Kato, Faculty of Education, Art and Science, Yamagata University.

> Video taken in Yamagata Prefecture, Japan.

Below is an excellent video made by Arco-beleno the Swiss importer of Marunaka machines

visit their website:  http://www.arco-baleno.ch/

 

           

 

 

 

 

  And... yES they do cut hardwoods! With the grain or against the grain!

 

What are they? Machines for fine finishing of solid wood boards and timbers
How do they work? They work by planing a very fine shaving from the surface of the  board much like a finely tuned hand plane.
What are the advantages? Impeccable Finish Quality /  provides the Best surface for glue or finishes / Very Fast / Very Accurate / Low Power Requirements / No Dust / Low Noise level / Compact Size etc....
How often do you have to sharpen

the blades?

Disposable blade lasts approx. 4600Ft and standard blade lasts approx.1650Ft when finishing Japanese Cypress.

Disposable blade lasts 2.5-3 times longer than standard blade.

Disposable blade has only 1 cutting edge per blade.

We have carbide blade for standard blade, but not for disposable blade.

Carbide blade is used for very hard wood only, such as rosewood and ebony. We don't recommend it for other than very hard wood.

Who use them? Furniture makers / Window and door makers / Organ builders/          Timber framers / musical instrument makers etc.
SUPER MECA

Work width x Height : 250 mm(40) , 165mm (60) x 180mm
Feed motor : 2.2 Kw
Head elevation motor : 0.1 Kw
Front knife size : 335 x 66 x 8mm
Net Weight : 430Kgs
SUPER MECA,
 Marunaka's new basic machine !
High rigid and stable machine form promises best surface finishing. The turn-table permits the bias angle to vary 0 ~ 60 according to the material.
Auto-return (once, twice or repeat) or One-way surfacing can be selected by micro-computer. Machine operating status is shown at monitoring lamp.

  Call for price

PDFカタログ      Super Meca 1 Mx pro & Super Meca

ロイヤル14FXROYAL 14FX CUSTOM


Work width x Height : 350 x 240mm
Feed motor : 3.7Kw
Front knife size : 500 x 66 x 9mm
Net Weight : 640Kgs
The ROYAL 14FX is an open sided machine and is capable of handling  work pieces up to 350mm. The turntable permits the bias angle to vary from 0 to 60 according to the workpiece.

 Call for price

PDFカタログ  

ROYAL 18FX CUSTOM


Work width x Height : 450 x 240mm
Feed motor : 5.5Kw
Front knife size : 640 x 66 x 9.5mm
Net Weight : 1,140Kgs
To strengthen the workpiece feeding capacity, the ROYAL 18FX has an enlarged body of heavy-duty construction. With the workpiece feed area so expanded, the ROYAL 18FX is capable of cutting a 450mm wide work at the maximum with stability.

PDFカタログ    Call for price

GT SLIDER
Work width x Height : 250 x 180mm
Knife bias angle : 42 fixed
Feed motor : 2.2 Kw
Head elevation motor 0.1 Kw
Knife stock slide motor : 0.2 Kw
Front knife size : 335 x 66 x 8 mm
Net Weight : 590 Kgs
Unique and patented "SLIDER" system employed which performs forward and return cutting with separate knives, which realizes the best finishing quality and also extends the life of the knives.

      Call for price

GT- Slider Video GT-Slider 1 Video GT-Slider 2 Video GT-Slider 3 Video GT-Slider 4 Video GT-Slider 5 Video GT-Slider 6 Video PDFカタログ

MX Pro-25
Work width x Height : 250 mm(40) , 220mm (45) x 240 mm
Knife bias angle : 20 ~ 45
Feed motor : 2.2Kw / Head elevation motor : 0.2 Kw
Knife stock slide motor : 0.2 Kw
Front knife size : 335 x 66 x8mm
Net weight : 750 Kgs
The Best Seller model of among our "SLIDER" series
A combination of five cutting methods and four reciprocating frequencies can be selected by micro-computer control. This high performance machine provides a superior finish. Unique and patented slider system, which performs forward and return cutting with separate knives, also extends the life of the knives. All operations, such as head up/down, feed start/stop and discontinue of reciprocating are performed by foot-switch for excellent convenience.

                                           PDFカタログ     Call for price    MX Pro-25 Video

MX Pro-30
Work width x Height : 300 mm(35) , 250mm (45) x 300 mm
Knife bias angle : 20 ~ 45
Feed motor : 3.7 Kw / Head elevation motor : 0.2 Kw
Knife stock slide motor : 0.2 Kw
Front knife size : 370 x 66 x8mm
Net weight : 815 Kgs
A combination of five cutting methods and four reciprocating frequencies can be selected by micro-computer control. This high performance machine provides a superior finishing by once putting the material. Unique and patented slider system, which performs forward and return cutting with separate knives, also extends the life of the knives. All operations, such as head up/down, feed start/stop and discontinue of reciprocating are performed by foot-switch for excellent convenience.

PDFカタログ     Call for price

MX Pro-35
Work width x Height : 350 mm(45) x 300 mm
Knife bias angle : 20 ~ 45
Feed motor : 3.7 Kw / Head elevation motor : 0.4 Kw
Knife stock slide motor : 0.4 Kw
Front knife size : 500 x 75 x 8 mm
Net weight : 1,200 Kgs
A big & heavy duty super surfacing machine !
A combination of five cutting methods and four reciprocating frequencies can be selected by micro-computer control. This high performance machine provides a superior finish. Unique patented slider system, which performs forward and return cutting with separate knives, also extends the life of the knives. All operations, such as head up/down, feed start/stop and discontinue of reciprocating are performed by foot-switch for excellent convenience.

                                           PDFカタログ    Call for price

ULTRA WII
Work width x Height : 250 x 180mm
Feed motor : 2.2Kw x 2
Front knife size : 335 x 66 x8mm
Net weight : 1,090Kgs
Top planing and bottom planing performed by one machine. Since two knives, one for rough planing and one for finish planing are set at both of the top and bottom, both sides can be planed with just one workpiece feed. Therefore, planing time can be shortened considerably. It can also be built into a line. Variable bias angle system permits to choose the optimum bias angle to obtain the best finishing for the workpiece according to its hardness and moisture content.

PDFカタログ  Call for price

NEWTON-W
Work width x Height : 250 mm x 20mm
Max. length : 300 mm
Knife bias angle : 40
Feed motor : 5.5 Kw
Conveyor belt motor : 0.1 Kw
Front knife size : 335 x 66 x 8mm
Net Weight : 670 Kgs
NEWTON-W is a very unique machine that is developed to finish short & thin material like lamellas for chopsticks with high feed speed of 97 m/min.(50Hz). Double-knife system on top & bottom + special auto-return conveyor belt performs to plane both faces along with grains just by once putting the material.

PDFカタログ     Call for price   Newton Video 1 Newton Video 2

      

RIGHT-ANGLE  25
Work width x Height : 250 x 150mm
Min. work width x Height : 10 x 10 mm
Knife bias angle : 40
Side feed motor : 2.2 Kw
Bottom feed motor : 2.2 Kw
Side head motor : 0.1 kw
Bottom head motor : 0.1 Kw
Side front knife size : 335 x 66 x 8 mm
Bottom front knife size : 335 x 66 x 8 mm
Net Weight : 1,430 Kgs
RIGHT-AN 25 performs to finish side & bottom face (right-angle) of the material at the same time with each double knife system.

                                            Call for price    PDFカタログ

  

CV-100BN
Work width x Height : 1,000 x 400 mm
Feed motor : 15Kw
Feed speed : 8 ~ 40 m/min.
Knife length : 1,150 mm
Net weight : 9,600Kgs
-An unique, four column type slicer for wide material up to 1,050mm.
-Roller table for smooth slicing.
-Specially designed for slicing resin & plastic.

  Call for pricing

V-62A
Work width x Height : 620 mm(45) , 440mm (60) x 180mm
Knife bias angle : 0 ~ 60
Feed motor : 7.5 Kw
Head elevation motor : 0.75 Kw
Turn table motor : 0.1 Kw
Front knife size : 880 x 85 x 9.5 mm
Net weight : 3,020 Kgs
An unique, four column type slicer for wide material up to 620 mm.
Employed turn-table system for variable knife bias angle which can be adjusted according to the material.
Most suitable for finishing ,for example, wider furniture parts etc.

PDFカタログ   Call for pricing

CV-62B
Work width x Height : 620 mm (40), 440mm (60) x 180mm
Feed motor : 7.5 Kw
Feed speed : 40 m/min.
Knife length : 880mm
Net Weight : 3,000 Kgs
-An unique, four column type slicer for wide material up to 620mm.
-Employed turn-table system for variable knife bias angle which can be adjusted according to the material.
-Suitable not only for wooden material, but also for plastic and resin.

    Call for pricing

CV-100B
Work width x Height : 1,050 mm x 240mm
Feed motor : 15Kw
Feed speed : 6 ~ 30m/min.
Knife length : 1,150mm
Net Weight : 5,000Kgs
-An unique, four column type slicer for wide material up to 1,050mm.
-Specially designed for slicing resin & linoleum.

    Call for pricing

Home

 Disposable Blade knife -set

lasts approx. 4600Ft and standard blade lasts approx.1650Ft when finishing Japanese Cypress.

We can say that changing blade lasts 2.5-3 times longer than standard blade.

 

I sometimes have used machines for sale or can get them, please enquire.

 

 

used 1973

GL-450nl Grinder/Lapper

Manual

 

Rebuilt Ultra II

Price $4,500 USD  Sale $3,900 USD 

 

  Grinder  video

 
       
Grinding & Lapping Stone for surfacer knife grinder
       
  Grinding Stone Lapping Stone  
Type WA80H-V TM-5  
Abrasive grains white alundum Mineral  
SiC(over50%)  
MgO(over 30%)  
MgCl2  
Grit #80 #4,000 - #5,000  
Grade H N5,000  
Bonding Agent Vitrifyed Magnesia oxicloride  
size 255 x 16 x 25.4mm 100 x 80 x 15.88mm  
  (out. diameter x thickness x hole dia.)    

 

  Rebuild Gallery

 

Contact me for more info and to see what I have available for sale.

A  Supersurfacer works similar to a large finely tuned hand plane turned upside down.  It consists of one fixed blade in the table and a heavy duty power feeder overhead which shoots the wood at high speed across the blade.  It takes a super thin shaving off the wood and leaves behind a beautiful shiny, mirror smooth surface. This type of Supersurfacer has the blade mounted in a huge turntable so that you can set a skew angle for the blade. The skew angle of the blade is fully adjustable from 0 degrees to 60 degrees! to perfectly match with the wood that you are cutting.

  Finishing a surface with the MARUNAKA Supersurfacer offers the following advantages:

  • Smooth and beautiful surface, best quality finish
  • Excellent results in all woods from Balsa to Rosewood; the blades are fitted in a turntable so that you can adjust blade shear angle
  • The only machine for high tolerance work such as craftsman style furniture, window and door making and musical instrument making
  • Wide range of applications from tiny musical instrument components to large beams for timber framed houses
  • Best adherence between lacquer and wood or veneer (tested by the German Institute for wood research in Brunswick)
  • The dimensions are absolutely precise
  • High feed speed, the fastest way to finish solid wood
  • No sanding necessary after varnishing ( t

    his saves one total working operation! )

  • No dust
  • No noise
  • Less energy consumption
  • Connection of the two models - Royal FX and Royal UP - dresses both sides in one operation
  • Compact machine takes only a small amount of valuable shop space
  • Reasonable price to performance ratio

 

SUPERSURFACERS

The sharpest blades

 

It is said that there are two kinds of woodworkers;  

      Those who sharpen blades when they are dull.

      Those who sharpen blades when they know they can be sharper.

The correct and most precise setup

The finest shavings

 

 

The finest finish

The shortest time.

Home

Sharpening Links                                        

http://bladetest.infillplane.com/index.html
http://www3.telus.net/BrentBeach/Sharpen/index.html
http://www.battlering.com/overkillsharp.html
http://www.cianperez.com/Wood/WoodDocs/Wood_How_To/INDEX_How_To.htm
http://www.e.yamagata-u.ac.jp/~ckato/video/video.html

Marunaka Blades setup

 

MARUNAKA Precision knife setting gauge

 

 

EFFECT OF KNIFE CHIPBREAKERS ON SURFACE FINISH

 

Professor Chutaro Kato

Yamagata University, Yamagata, JAPAN
 

ABSTRACT

A video was made to show how a chipbreaker (cap-iron) functions during orthogonal cutting of wood. A video tape of the cutting action was made using a microscope and video camera. The cutting action is almost the same as that produced by a Japanese hand plane except for the very low cutting speed. The tool angle is 30. The clearance angle is 10. The edge angle of the chipbreaker is either 50 or 80. The depth of cut is either 0.05 mm or 0.1 mm. The inclination angle of grain to the cutting direction is either +7 or -7. The negative number of the inclination means that cutting is against grain, which results in a high probability of chipped or torn grains. This video shows exactly how the chipbreaker prevents the generation of the chipped or torn grains in cutting against the grain.
 

INTRODUCTION

Wooden studs with a 5 in ~ 5 in cross section are frequently used in the construction of typical Japanese houses. The faces of the studs are exposed on both the inside and outside of the rooms in the house. The surfaces are usually finished by cutting with hand planes, are exceptionally smooth, and are kept natural without paint. A wooden stud whose surfaces are not coated with paint adjusts to the humidity inside a room so well that an individual can live comfortably. In order to get the fine surfaces, Japanese-type hand planes are used by carpenters. Recently, a woodworking machine which has the same cutting principle as a hand plane was designed. This machine is called a super-surfacer in Japan. Super- surfacers have replaced the hand planes to reduce the labor intensive nature of the finishing process. Surfacers have a very sharp cutting knife that produces exceptionally thin chips (< 0.1 mm). The wood cells must be cut cleanly without crushing them in order to get the fine surface finish. Japanese middle school curricula have technology as one of the required subjects, which includes woodworking. A hand plane is used as a teaching tool for making some small wooden products such as a book shelf. This video was made for the purpose of helping persons, including middle school students, understand wood cutting principles so that they can master woodworking technology efficiently. PROCEDURE FOR TAKING VIDEO This video demonstrates how a chipbreaker (cap-iron) functions during orthogonal cutting of wood. A video tape of the cutting action was made using a microscope and video camera system as shown in Figs.1-3. The cutting knife was fixed to the vertical axis of a plain milling machine (Fig.1). The workpiece was set on the table feeding slowly at a fixed speed. The depth of cut was set by adjusting the height of the table. The knife consisted of a tool and a chipbreaker (Fig.2). The position of the chipbreaker was adjusted by turning a micrometer screw until its edge came to one of the predetermined position marks. The position marks were made on the rake face of the tool with Vicker's micro-hardness tester at the distances of 0.1 mm, 0.2 mm, and 0.3 mm from the tool cutting edge (Fig.3).


 


 

Fig.1. Video camera and microscope system.
Notes: 1: workpiece , 2: table of milling machine, 3: displacement meter, 4: microscope, 5: video camera, 6: lights


 


 

Fig.2. Cutting knife and micrometer adjustment.
Notes: 1: tool, 2: tool holder, 3: chipbreaker (cap iron), 4: screws to make chipbreaker edge parallel to the tool edge, 5: micro-meter for adjusting chipbreaker position.


CUTTING CONDITION

The cutting action is as shown in Fig.4. The tool angle (wedge angle) is 30 and the clearance angle is 10. The edge angle of the chipbreaker is either 50 or 80. The depth of cut is either 0.05 mm or 0.1 mm. The inclination angle of grain to cutting direction is either +7 or -7. The negative inclination angle means that cutting is against grain. This produces a high probability that chipped or torn grains will occur.


 


 

Fig.3. Cutting action.
Notes: : 50 and 80, : +7 (cutting with grain) and -7 (cutting against grain), D: 0.1, 0.2, and 0.3 mm, t: 0.05 and 0.1 mm, cutting speed: 0.4 mm/s, wood: Hoonoki (Magnolia obovata Thunb., moisture content: 10 %, specific gravity: 0.45)


 

SAMPLE PICTURES

The nine combinations of cutting conditions were recorded on the video camera system and are shown in Fig.4-Fig.12.


 


 

@Fig.4. The knife without a chipbreaker is cutting wood with the grain. The depth of cut is 0.1 mm. This cutting condition produces a good surface finish.


 


 

Fig.5. The knife without a chipbreaker is cutting wood against the grain. The depth of cut is 0.1 mm. The chip forms by cleavage failure which extends into the workpiece and below the plane generated by the path of the cutting edge. As the result, this type of failure produces a machining defect commonly called chipped or torn grain.


 


 

Fig.6. The knife without a chipbreaker is cutting the wood against grain. Chipped grains are not generated and surface finish is good. Only the depth of cut is now changed from 0.1 mm to 0.05 mm.


 


 

Fig.7. The knife with a chipbreaker is cutting wood against grain. The depth of cut is 0.1 mm. The chipbreaker is set at the farthest position of 0.3 mm from the cutting edge and has an edge angle of 50. When the chip is sliding along the chipbreaker face, frictional forces must be generated between chip and chipbreaker, which tends to reduce the amount of cleavage fracture. However, the action is still not good enough to eliminate chipped or torn grains completely.


 


 

Fig.8. The chipbreaker whose edge angle is 50 is set at the position of 0.2 mm from knife cutting edge. The depth of cut is 0.1 mm. The effect of the chipbreaker is to reduce the occurrence of chipped and torn grains considerably.


 


 

Fig.9. The chipbreaker whose edge angle is 50 is set at the closest position of 0.1 mm from the knife cutting edge. The depth of cut is 0.1 mm. Initially the chip thickness varies but then stabilizes after a short time. Neither chipped nor torn grains occur. The surface finish is good.


 


 

Fig.10. The edge angle of the chipbreaker is changed to 80, which is the largest used. The chipbreaker is set at the position of 0.1 mm. The depth of cut is 0.1 mm. Neither chipped nor torn grains occur. Deformation of the chip, however, extends below the plane generated by the path of the cutting edge. The chipbreaker position is too close to the knife cutting edge. The surface finish is good.


 


 

Fig.11. The chipbreaker is set at 0.2 mm, which is the mid-position from the knife edge. The chipbreaker has the edge angle of 80. The depth of cut is 0.1 mm. The chipbreaker is working well. Chipped grains are not generated and surface finish is good.


 


 

Fig.12. The chipbreaker is set at 0.3 mm, which is the farthest from the knife edge. Deformation of the chip against the chipbreaker is reduced and serious cleavage failure of the chip does not occur. The surface finish is good.


 

CONCLUSION

  1. There is an absence of surface damage when wood is cut against the grain without a chipbreaker at a depth of cut of 0.05 mm.
  2. In cutting against the grain at depths of cut greater than 0.05 mm the chipbreaker should be set at the correct position depending on the depth of cut.
  3. The knife with a chipbreaker whose edge angle is 80 has a larger effect on the prevention of surface damage than one with a chipbreaker whose edge angle is 50.
  4. I hope the video has provided some understanding of the action of a chipbreaker in orthogonal machining of wood.

 

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