Planer wood electric

[Speedy Builder5Participant @speedybuilder5]

I have a Bosch PBO-1 electric hand planer. Recently, there is undue vibration from the cutting drum. It seems that the roller bearing on the end of the drum opposite the drive belt had run dry (greased for life) and has worn the shaft down by about 0.003″.

I was puzzled that the toothed pulley on the motor shaft had a LH thread, but that on the drum it is a RH thread. Rotation of the motor viewed from the pulley end is clockwise.

I don’t understand!

[Tony Pratt 1Participant @tonypratt1]

The LH and RH thread configuration is to keep every thing tight in operation, much like a bench grinder.

Tony

[not done it yetParticipant @notdoneityet]

One pulley may be keyed?

[Speedy Builder5Participant @speedybuilder5]

Tony, both pulleys are in the same plane. The motor spindle pulley is prevented from turning by way of a LH thread, so it is self tightening. The planer drum pulley does sit on a taper, but if the taper failed, the pulley would wind itself off and smash into the plastic casing.

NDY, no keys, just a taper on the drum spindle.

[Charles LamontParticipant @charleslamont71117]

As Tony says, I think. Remember the motor pulley is driven by the motor, but the drum pulley is driving the drum.

[Speedy Builder5Participant @speedybuilder5]

Understood, thanks Gents, regarding the planer, the replacement drum, bearings and probably a new set of brushes is about the same as a Lidl special. I may pass the planer onto my neighbour to totally abuse it like he has done to some of my other tools!

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