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Harold Hall

Workshop Processes

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With the first pass completed without the stop, lock the saddle and set the stop at this position. For this, it will be necessary to use the stops inherent adjustment to be sure that it is only just contacting the lathe's saddle. Completing the machining will now be easy, Photograph 4, though if the length is critical the top slide can be advanced slightly to finalise the step's position providing the part was initially turned a little short, still using the stop of course.

 

And in Reverse

A less frequent requirement, but still not that unusual, is to machine to a right hand step, Photograph 5, a situation that requires the stop to be positioned on the other side of the saddle, Photograph 6. Many, more complex saddle stops will not permit them to be used in this way and is a definite advantage with the simple design seen in the photographs.

 

Headed Pins, or similar.

Sometimes a requirement surfaces to make a batch of headed components requiring the heads to be the same thickness, Photograph 7, screws would have a similar requirement. This is an easy operation with the head against the chuck's jaws and just facing each head in turn with the saddle locked in position. It does though need the cross slide to be moved well back so that the top slide does not interfere with the action of removing the finished part and fitting the next one for machining. Setting the saddle stop will allow the saddle to be wound well away from the chuck making it easy to remove and fit the workpieces unhindered.

 

Similarly, if using a back stop then typically machining a batch of spacers that do not have heads can also make use of the saddle stop for the same reasons. These simple examples illustrate that the saddle stop can be particularly beneficial when producing batches of components.

 

Milling on the lathe

It should not be overlooked that the saddle stop can be very useful for some situations where milling is being carried out. Unfortunately though, milling tasks are much more varied than those when turning and giving examples is not easy. One such operation that I remember has surfaced is the need to machine two faces at the same level but it being impossible to traverse the cross slide from one surface to the other due to the clamps being used to secure the item, preventing the cross slide from being traversed. I should add that I am talking about a part mounted on the vertical slide.

Lathe Saddle Stop, using
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Lathe Saddle Stop, reversed
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 4

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 5

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 6

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 7