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Brief Instruction
To guarantee a precise thread start position, the core holder must run against a fixed stop with its entire front surface area at a pressure not exceeding 40 bar.Once the holder lies flush against the fixed stop, the flow of hydraulic fluid must be shut off by means of a proximity switch.
For the core holder operating stroke, the unscrewing pressure
must be higher than the screw-in pressure. However, the unscrewing
pressure should not be higher than 100 bar. With OMM50 motors, this pressure should not exceed 70 bar.
The retraction of the core holder must again be stopped by a proximity switch. This will involve some afterrunning. Care should be taken to ensure that the core holder does not run up against a fixed stop at this point. In case this has happened, the core holder must be released manually.
With through-thread, note that the core holder must not touch but should have up to 0.02 mm play upon reaching the thread start position. This amount of play will not yet result in melt film formation.
In
order to maximize the positioning accuracy, the core holder must run
against a fixed stop with its entire front surface area (see area
marked in red). The thread core itself should not strike firmly against
a surface. We recommend approx. 0.02 mm core play.