SOLID WOOD PROCESSING - SPINDLE MOULDER
This article explains the working of the Spindle Moulder for solid wood processing.
Spindle Moulder is the most versatile machine in any Solid Wood or Panel Processing factory. It is used for Shaping, Profiling, grooving, Tenoning, Milling etc. The material, which can be worked up on, is Solid wood, plywood, Chipboard, MDF, Pre Laminated board etc. The machine can be either manual feed or with Auto feeder with variable speed.
The machine is composed of (1) Main shaft/spindle, (2) Spindle Speed Selector, (3) Fence, (4) Guide for Milling Template. (5) Pressure unit.
• Spindle : The spindle of the Moulder can be Fixed or Tilting type. In the first case the spindle can move up or down only. The diameter of the shaft of the moulder is selected in such a way that inter-changeability is achieved with other moulders or 4 side planner moulder in use.
The spindle can be Tilting one with 45° tilt. This makes it possible to have more profiles by using Single cutter block. In certain cases where the repeated production is planned after some interval of time, it is suggested that one should have interchangeable spindles with the machine. The tools are mounted on the interchangeable spindle A & the whole assembly is changed before making a chart of the positions of various fences & spindle height. For setting the machine in this type again the respective interchangeable spindle is fitted on the main shaft & the fences are set in the old positions (as per chart). The machine will be ready for the production without any loss of time.
• Spindle Speed Selector : The spindle speed should be selected according to wood, Tool, Tool Diameter and the working. The following chart indicates how to select the speed of the shaft according to rim speed & diameter of the tool.
The table gives the approx. values of the Rim speed accordingly to the material to be
The thumb rule for spindle speed is -bigger the tool diameter : lower speed
smaller the tool diameter : higher speed.
The V belt tension should be checked after 10 to 12 hours of working of the machine. The belt tension is accurate when, by applying 3 kg of force on the belt center you get a deflection of about 5 mm. The belt tension should be checked periodically every 6 months.
• Fence : The fence has two halves P & M, which need setting as per the diameter & profile of the tool. The compression springs A, when properly adjusted, ensure constant pressure on the work piece.
Aligned fence Halves : Two halve of the fence M & P are aligned in straight line. A wooden piece L is inserted between the fence in order to protect hands This wooden piece is 2 mm away from external tool diameter. Then machine is started & the wooden fence is gradually pushed against the tool till the tools protrude out by amount equal to the depth of the cut required.
Not Aligned Fence : Usually the spindle rotates counter clockwise. The two fence halves M & P should be aligned as much as possible with maximum diameter ofthe cutter Both the fence halves shall be as near as (2-3 mm) possible to the external diameter of tool. To adjust the material removal depth or cut, set the fence half P as per requirement.