DC300A Optional Accessories - Products

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►DC300A Optional Accessories

Bundle clamping system for small diameter bars

PETRA Machines has designed and developed a Clamping System for Small Diameter bars in Bundle, which effectively hold the bars in position, allow machine to cut at optimum speeds and feeds,avoid burrs and increases the durability of the blade.


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This Clamping system for Small diameter bars in bundle has been successfully integrated with PETRA Machine's standard Dual Column Bandsaw Machine Model DC300A.
Anyone cutting the small diameter bars in bundle knows,how difficult to cut. Practically speaking,it is not from the point of view of 'Cutting difficulty' of these diameter bars, but from the point of view of the its end result and henceforth its cutting and operational cost.

The main problem occur in a normal standard machine(even after using a correct TPI blade, speed and feed) are:
01.Burrs on the face of the cut piece.
02.Some times one of the bars in the bundle rotates and damages the blade.
03. Reduction in the blade durability.

Normal working pressure in a standard bandsaw may be 40bar, which may exert a force of 1 ton and this force is very high as far as 12 mm dia bars clamped in bundle is concerned.This high pressure tend to make the bundle gets disturbed and bars may jump of or even rotate.

At PETRA Machines, we analyzed these problems and concluded to have a reduced clamping pressure in the Feeding vise and a top guide at the shuttle vise, which would not exert any pressure on the bars, but shall touch the bars and restrict their upward movement and most importantly an extra vertical clamp just near to the blade at the exit. This clamp is a mechanical clamp with adjustments for various sizes and keeps the optimum pressure on the 'Cut lengths', to avoid any movement after the cut is over.

The unique feature of this clamp is , to reduce the feed at the 'near end of the cut' to avoid any damage to the bar edges.

The machine is already having its standard vertical clamp at the front vise, behind the blade line.This comprehensive clamping system for such applications, has given the best results in terms of , nearly eliminating the burrs at the edges and improvement in tool life, with optimum speeds and feeds. Hence reducing the cutting time.
A 12mm diameter bundle (12mm dia x 14 no bars in a single row bundle) takes only 12 seconds to cut, mainitaining the excellent surface finish and durability of the blade.The results are excellent and encouraging too for other small size below 35mm diameter.

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