Maintenance and Proper Use of the Saw Blades

it is necessary to regularly and properly maintain the tools to achieve their greatest possible lifespan and proper function.

Generally

We supply the tools "RP for setting“, “ RP for beetle“ and the tools with hard chrome coat as semifinished goods, therefore before first use it is necessary to properly set (beetle, equalize) and sharpen them.
We supply the saw blades with stelitte-tipped teeth already sharpened and prepared for work.

Furthermore in the text there are stated recommendations and instructions about how the tools should be handled. If they will not be followed, then unfortunately it is not possible to guarantee a problem free functioning of the tools nor to honor possible complains and claims arising from this.

Storage

It is necessary to store the tools at a temperature of 0°C - 45°C in an environment with the relative humidity of up to 60%. The tools, as all products made from iron metals, have a tendency to corrode in more humid environments. The same applies to environment that is colder than stated (condensation of humidity in the).

Operational Service

It is necessary to perform an operational service after every cutting.

The operational service is understood to be:

  • the inspection and correction of setting (for saw blades with set teeth)
  • the inspection and correction of beetle (for beetled tools)
  • re sharpening of the tools

If the tools will be out of operation for a prolonged period of time (several days) then it is a good idea to treat the surfaces with conserving oil. This will prevent the unwanted start of corrosion.

After every 5 - 6 re sharpenings it is recommended to inspect the inner tension of the tool, possibly to modify it to the required values.


Setting of Teeth

The proper setting of teeth has a great impact on the resulting roughness of the cutting area and mainly on the geometrical accuracy of the dimensions. Its value and evenness (and also obviously the movement of material into the cut) depends on the amount of removed material for one tooth.
The roughness value of the cut surface increases with the size of the setting (size of the deviation angle) and the higher movement onto the tooth.

The basis of reaching the correct setting of frame saws lies in the alternating bending of the teeth out to the side by the amount which will not be too great or too small (and the problems related to that - see above).

Generally the teeth should be set in about the 1/3 of the height from the tip of the tooth, where the setting to the one side should not exceed the value equal to half of the width of the body.

The size of the setting is affected by several factors:

  • the type of wood (for soft, pulp wood a greater setting is necessary)
  • the humidity and the thermal state of the wood (the moist wood tends to clamp the tool more than dry wood during the same setting)
  • precision of the tool's clamping
  • precision of trunk guidance (during non-precise guidance a greater setting is needed)
  • the planeness and the state of the tool (if the blades are bent, with bulges but it is still possible to use them, then it is necessary to use a greater setting)
  • tool dimensions
Recommended values for the RP setting
Wood Setting to one side
Soft - humidity up to 25% 0.55 mm - 0.65 mm
Soft - humidity above 25% 0.65 mm - 0.75 mm
Soft - frozen 0.55 mm - 0.65 mm
Hard - humidity up to 25% 0.45 mm - 0.50 mm
Hard - humidity above 25% 0.55 mm - 0.60 mm
Hard - frozen 0.45 mm - 0.50 mm

In order to achieve evenness of this deflection and with that also the acceptable quality of the cut area, the following is necessary:

A) The use of an adequate setting fixture
  • the ideal method is to use a setting machine
  • a less expensive method may be the use of setting pliers
B) The use of an adequate measuring device for the inspection of correctness of the setting
  • the ideal is to use a dial gauge

Causes, Consequences and the Removal of Possible Errors Caused by Incorrect Setting

Defect Cause Consequence Repair
One sided setting
Insufficient inspection of the setting Saw blade run in (so called S cut) Inspection by a precise measuring device, this straightening of the tool body, modification of the setting
Not precise setting
The setting is not being inspected; not precise measuring device of the setting; tool body is not straightened, the setting was not adjusted before sharpening and was not checked after sharpening Rough surface of the sawn wood; run in; low feed speeds Inspection and correction of setting after sharpening, removal of the needle, cleaning of the blades
Small setting
The setting is not being inspected; not precise measuring device of the setting Overheating of the tool, run in, feed speeds Following the instructions for the preparation of the tools
Large setting
Increased percentage of sawdust, greater consumption of energy, run in, rough surface, wave shaped cut
Damage of the teeth edges
Not careful handling of the tools Lowered performance of the tool, greater roughness of the surface Remove the causes

Proper Setting:

  • even on both sides
  • all of the teeth are set in the same manner, precisely
  • overlap to one side is not greater than ½ the thickness of the body of saw nor is it too small
 
 


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