I still have my old 1970s b/d mains drill as good as the day it was made.
Over engineered but then if everyone made things this way they would never
get another sale would they? grin.
Brian

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"The Natural Philosopher" wrote in message
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On 12/07/18 10:28, Harry Bloomfield wrote:
I asked some while ago if these things might include a clutch to prevent
overload, because the drive was frequently slipping and received no
answer. It is the 600w model, with a blade able to be rotated from H to V
cut.

I have been inside and no, there is no clutch at all. The slippage was
due to a worn drive system.. The end of the motor shaft has a pinion,
which drives crown wheel, which was partially supported on one side by a
casting. The quite soft metal crown wheel had worn in one spot, which was
where it was causing slipping. The crown wheel was on a spindle, with a
small roller bearing top and bottom, bottom in rigid casting, top bearing
supported by the plastic housing. Absolutely no adjustment anywhere at
all and a very poor design.

I fitted a small washer under the bottom bearing, to push the crown wheel
a tad further out of the casting, making the crown wheel a tighter fit
against the motor pinion. It will not likely last long.

I have had it around three years, during which time have have probably
cut our bit of hedge around nine times in total, so rather disappointed
that it survived such a short time.

Ihave found that sort of behaviors in many later electric triummers. They
are built to a price and a quality that just takes them through warranty.

A cast mezak crown wheel is pence. To machine a decent one out of hard
steel is pounds.

Go figure.

I inherited a B & D electric drill from my father - he got it around 1960.
It lasted until 1995

I have had three sinec then, all scrapped.



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