Methods of Achieving Straightness

Unless special straightening is requested by the customer, Roton will ship screws in “as rolled” straightness condition. For most applications, this level of straightness is sufficient and cost-effective. But some applications have more demanding straightness requirements.

Users with applications requiring screw shafts to be straightened beyond “as rolled” condition should specify a finished cut length and the straightness requirements in TIR. The shafts should be purchased cut to length and straightened at our facility. It is imperative that all the handling and other precautions detailed in the “Preserving Straightness” section below be observed and followed to avoid the loss of this added value.

Users with high part volumes or a variety of part lengths might find it more economical to operate their own straightening equipment. In either case, since the longer the shaft is the more difficult and time consuming the straightening is, costs can be minimized if shafts are finished cut prior to straightening.

Because straightening can be expensive, users who have more liberal straightness specs may choose the option of buying random lengths in bulk, cutting to length first, and then segregating and straightening only those parts that are too bent to be used. This is especially effective for meeting “visual” straightness specs, where a screw’s wobble is a perceived defect.

For more detailed discussions about achieving straightness or to discuss a particular application, contact Roton Application Engineering.