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Harold Hall

Workshop Processes

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Photograph 8 shows a similar situation where a number of large washers were being made, making it necessary to part off at a large diameter of 38mm. Most lathe users will know that parting off is one of the more problematic tasks and can only be undertaken easily close to the chuck and with a rear mounted tool. However, the method described above works well showing that the fixed steady is not limited to just light duty tasks. If the task has been running for a few minutes though you will need to reset the steady's arms as even with the smallest clearance chatter will occur. In this case, for smaller diameters, just drop the top arm to take up the clearance, for larger diameters adjust all three.

 

The advantage of both the above examples being that there are no short pieces left that may never find a use, particularly worthwhile where large diameters, such as 38mm, are involved. If you do not have a motorised hack saw or band saw then the method can avoid the laborious task of cutting a piece off manually.

 

I realise that the above only describes a limited range of tasks but feel that the examples given cover the essential requirements.

 

Travelling Steady

Using the travelling steady is quite different from using the fixed steady in that the fixed steady is used for supporting mostly ridged workpieces that project too far from the chuck holding it, the problem being in the grip of the chuck rather than the flexibility of the workpiece. The travelling steady though is for machining parts that are too fragile to withstand the forces being placed onto it.

 

There are two ways of using a travelling steady, in one the arms are supporting the diameter in front of that being turned and the other supporting the diameter being turned. In the first method the arms lead the cutter whilst in the second method they trail the cutter, both having their advantages and disadvantages.

 

Method 1. Considering first the method where the arms are supporting the diameter in front of the cutter, Sk.3.A. The main advantage of this is that at the start of a cut the arms will already be supporting the material and so the start is problem free. How then is the steady set for this method. Having mounted the steady onto the saddle the cutter is set just behind the trailing face of the arms, say 4mm, using the top slide and the slide locked in this position.  With a short piece of the material projecting from the chuck and the arms well clear, machine a short length to the diameter eventually required and lock the cross slide. Following this the steady's arms can be moved in to contact the larger diameter and secured. This setting stage can be done using the material to be used for the finished part,  alternatively, a small scrap portion of the same diameter.

Fixed Steady, Using
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