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DIAMOND SAWS
After conducting extensive trials with marble, granite and other stones from various sites in Rajasthan, Andhra Pradesh and Karnataka, Bhukhanvala introduced circular Easi-cut Diamond Saws nearly two years ago in the Indian market with principally five different bond systems. They found immediate acceptance, since their use resulted in higher production and productivity, better quality and lower production costs and at the same time ensured smoother and reproducible operations with the available machinery. In course of time, many special bond systems have been independently developed at their R&D centre to meet more specific and rather stringent requirements on a case to case basis, and today Bhukhanvala produces Easi-cut Diamond saws with more than 150 combinations of time-tested bond systems, grit sizes and diamond concentrations not only for marble, granite and sandstone but also for all types of refractories, graphite and asbestos. In time, bonds have been developed even to suit individual machines -be they foreign or Indian -so that they would realize their peak efficiency. Today, Easi-cut saws are natural leaders and firmly implanted in all segments of the stone industry.

Bhukhanvala now advances a step further and introduces the frame saw for India's gigantic marble cutting industry as an import substitution item using steel blanks made in association with Mummenhoff, famous the world over for their premium quality. Specific bonds have been developed to work with imported machines like BRETON, BRA, KARL-MAYER. ARABUS, GREGORI etc. as well as for the common Indian machines. Bhukhanvala's saws, be they circular or frame saws, are produced on sophisticated imported equipment using only high purity raw materials. The steel blanks for saws are imported and made from sheets/coils of special quality Electric Furnace Steel. They are also properly tempered and tensioned. For high stress applications, the slots in circular saws are specially laser cut to prevent cracks and premature breakdown.

The saws are supplied in various bonds, grit sizes and diamond concentrations to suit specific requirements. As a rule, however, particulars of the bond, grit size or concentration are treated as strictly confidential and not disclosed to the buyer / user. Truly, to optimize the performance of saw segments for a specific job is no simple matter. Indeed, it is quite complex involving a delicate balance between the bond system, the grit size and the diamond concentration for a set of machine operating conditions and hence the secrecy.

The circular saws are made both in normal (or wide) slots and reduced (or narrow) slots. Generally, saws with normal slots are used for granites, refractories and hard stones. This type of saw is ideally suited for deep and slab cutting and gives a satisfactory finish of the sawn surface. It also ensures optimum coolant feed and removal of the cut material. Saws with reduced slots are generally used for marbles, ceramics, glass and with materials having sensitive edges and corners. This type guarantees precision cutting as well as clean edges on previously polished work pieces.


Saw Specifications
  Saw dimensions are shown in Figure 1
and the various standard sizes are listed
in Tables 1 and 2.
 

 

The Easi-Cut 'LC' saws are provided with special
kind of laser cut slots to achieve the advantages
of low noise and higher cutting speeds.
They usually give 10 to 20% longer life. These are
high priced premium grade saws and are supplied
only after consultation

Figure 1 : Saw specifications

 
Rules For Saw Selection
In selecting a circular saw for cutting stones, rocks, refractories or other such materials, the following points must be carefully considered:

i) The material to be cut
ii) Cutting quality and thickness desired
iii) Service life of the saw desired
iv) Machine characteristics

Only after properly considering the above, it is possible to correctly decide the saw dimensions (i.e. diameter, type of slot, segment thickness and depth of diamond impregnation) and the segment specifications (i.e. the bond, diamond grit size and its concentration). Primarily, the hardness and abrasivness of the stone or rock would decide the segment specifications. At the same time, however, one must also consider whether the saw is to provide basically a high output or a long service life.
 

Fast cutting saws naturally have a short life, since a softer bond and/or a lower concentration is used. This type of saw can be used satisfactorily only on sturdy and nearly vibration-free machines and that too at high peripheral speeds only. Conversely, saws for a long service life must operate at low cutting rates and require higher drive outputs. Machines susceptible to vibrations and having somewhat lower peripheral speeds could also be used with such saws. Briefly, a high cutting rate would result in high production output and also high cost of saws, but at the same time low wages and machine over-heads. In contrast, a long saw life would result in low production output and also low cost of saws, but correspondingly high wages and machine overheads.

Obviously, maximum economic efficiency can only be achieved by a judicious balancing of high cutting rate with long blade life

ORDERING

When ordering for the first time, please let us know the
i) Diameter of the saw and bore diameter required
ii) Material to be sawn
iii) Machine data such as Motor HP, Speed Range (RPM), Rate of Feed (m/min), Flange Diameter and Make and Model No. of the machine
iv) Details of the saw used at present

For repeat orders, however, only (iv) need be specified. it would be sufficient to give the Serial No. of the saw or the Delivery No. or the Invoice No.

Please fill in the attached questionnaire form to enable us to assess your requirements and problems so that we could provide special attention and give such service that would enable your unit to function uninterruptedly and efficiently, thereby increasing production and productivity.


STANDARD SAW SIZES & SPECIFICATIONS - NARROW SLOTS


TABLE 1: Standard Segmental Saw Sizes and Specifications - NARROW SLOTS
  Recommended for Marbles, Ceramics & Soft Stones
                     
Catalogue Segment Nominal  Cutting  Depth of  Overall Segment  Saw Blank  No. of Bore
No. Spacing  Diameter  Width Diamond Depth of  Length Thickness Segments  
          Segment          
    D T* X XI* L2 E     H
BDT 200 N Narrow 200 2.0 5.0 7.5 40 1.2 13  

BDT 250 N Narrow 250 2.4 5.0 7.5 40 1.6 18 **
BDT 300 N Narrow 300 2.8 5.0 7.5 40 1.8 21  
BDT 350 N Narrow 350 2.8 5.0 7.5 40 2.2 25  
BDT 400 N Narrow 400 3.2 5.0 7.5 40 2.5 28  
BDT 450 N Narrow 450 3.6 5.0 7.5 40 2.8 32  
BDI   500 N Narrow 500 4.0 5.0 7.5 40 3.0 36  
BDT 550 N Narrow 550 4.5 5.0 7.5 40 3.5 40  
BDT 600 N Narrow 600 5.0 5.0 7.5 40 4.0 42  
BDT 700 N Narrow 700 5.5 5.0 7.5 40 4.0 50  
BDT 800 N Narrow 800 6.0 5.0 7.5 40 4.50 57  
                     
ALL DIMENSIONS IN MM ** or 17
Nominal size. It will vary depending on application.
 
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