Houfek R530 Surface Planer

If you are looking for the best, look no further than the Houfek R range of surface planers. Available in 430mm and 530mm working widths, the R models feature SUVAMATIC cutterhead guard and powered infeed table adjustment with table top electronic dial control for instant precision setting. Processing work pieces over 3m long, the R range of surface planers are built for those who won’t accept second best.
The R surfacer is equipped with powered movement to the infeed table settable using an ergonomically positioned dial wheel with electronic digital display. These features are combined with a table length of over 3000 mm and width capacity of 530 mm.

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Столы изготовлены из стали, а не чугуна... Чем это обусловлено и как в практике, плоскостность не меняется со временем? Спасибо.