A couple of nice slot milling images I discovered:
through the slot
Image by joysaphine
index_head_closeup
Image by smellsofbikes
I took a big chunk of aluminum and bored a hole via for the spindle, which fits the Atlas lathe chuck. (I had the spindle sitting about from several I cut when I was thinking about developing my own mill.) The two holes at the leading of the block are the pinch bolts that act as spindle brakes the index plate at the back is engaged with a swingarm and plunger. The swingarm is internally bored and fitted with a spring and bearing ball to act as a detent for the plunger.
50 Pence coin 1994 – 50th anniversary of D-Day – Normandy Landings
Image by ell brown
Coin souvenir’s that had been in the back of a drawer. Believed I would share them.
I think that this 50p coin from 1994 was the the 50th annivesary of the D-Day landings. I had two of them.
Fifty pence (British coin)
The British decimal fifty pence (50p) coin – frequently pronounced "fifty pee" – was issued on 14 October 1969 in the run-up to decimalisation to replace the ten shilling note. Regardless of the coin’s novel shape, there was initial confusion amongst some members of the public, with the coin becoming mistaken for both the old half crown and the new ten pence piece.
The coin is minted from a cupronickel alloy of 75% copper and 25% nickel. Amongst 1969 and 1997 the coin weighed 13.50 grams and had a diameter of 30. millimetres. In 1997 the coin was lowered in size to weigh eight.00 grams with a diameter of 27.three millimetres. Apart from the reduction in size the style remained essentially the exact same (though the original is no longer legal tender).
The coin is not circular but is an equilaterally curved heptagon to aid identification. The sides are not straight but are curved so that the centre of curvature is the opposite apex of the coin. In other words, whilst the coin is of a shape which doesn’t have a fixed radius about any point, it does have a fixed diameter as a minimum dimension across the face of the coin. This makes it possible for the coin to be much more easily utilised and verified as legal tender automatically in vending machines and slot machines for instance and also to roll freely (see also curve of continual width). The exact same shape, although of a smaller diameter, was also later used for the twenty pence piece.
The obverses from 1985 to 1997 the head of Queen Elizabeth II by Raphael Maklouf.
Big – commemorative issues
1994: 50th anniversary of the Normandy Landings ("D-Day").
Obverse: Maklouf head, inscription ELIZABETH II D G REG F D 1994, starting to the bottom left of the head.
Reverse: An invasion force of ships and planes, 50 PENCE to the appropriate. Made by John W Mills.
Reasonably modest numbers issued into circulation.
