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Home Workshop > Members > Forum > Projects Area > Machine Restoration > Parkson dividing head

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Parkson dividing head

Parkson dividing head

I have recently acquired a Parkson dividing head. The item bears no name itself but is identical to the ones shown on Tony's  lathes web site; the distinctive feature being the indexing arm, not directly fixed to the worm drive, but clamped with adjustment screws to alter the zero. It seems a well made device, despite, or perhaps because of, obvious neglect, to work smoothly. The issue is to do with the differential gear banjo mounting. On other such heads with this capability that I have had the first part of the support casting is machined to take the banjo bearing pinch clamped in position. This is not the case here; the casting is not machined, or only very slightly and not to much effect - this is not damage, it obviously never was serviceable for this function. Meanwhile there are two lugs bolted on to the back of the main body with no obvious purpose, except possibly to support a guard over the gears, though they are a long way from the line of the gear train; perhaps they held a kind og floating banjo, though again distance is against them. It would be easy enough to complete the machining of the casting, albeit in need of a sleeve to increase its diameter, but it makes me wonder if Parkson had a different solution. If someone else has a similar device in rather more complete form I would be delighted to hear from them.

Nick

When you stop learning you start dying

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Nick Kempley
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Re: Parkson dividing head

As chance would have it a Parkson dividing head has turned up on ebay. Slightly odd that it was shown as being by an international seller in Wallsall! It does include some very good pictures of a quadrant with gears, and an unusually complex thing it is. It is however clear that it is only for connection to the leadscrew, not for differential work; indeed all the pictures of this head in use in set up in that manner. This is slightly odd since the gears listed in the brochure I found on line is identical to that used by other manufacturers for differential work.

Nick

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Nick Kempley
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