[modeleng] Re: GHT Dividing Head

Roger,

From memory the plate with all the holes in it is keyed to the spindle, =
hope
that helps.

Regards, IP

"Life should NOT be a journey to the grave with the intention of =
arriving
safely in an attractive and well preserved body, but rather to skid in
sideways, Champagne in one hand - strawberries in the other,=20
body thoroughly used up, totally worn out and screaming WOO HOO - What a
Ride!"=20
=20
Priest & Sons Model Engineers
http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm


-----Original Message-----
From: modeleng-bounce@xxxxxxxxxxxxx =
[mailto:modeleng-bounce@xxxxxxxxxxxxx]
On Behalf Of Roger Mason
Sent: 30 April 2005 09:58
To: Model Engineering List - Latest
Subject: [modeleng] GHT Dividing Head


Hi,

    As there is a demand for ME related postings - I have a query about=20
a George Thomas dividing head.

    I own one of these rather nice dividing heads,  but I did not make=20
it,  thus I am not familiar with the intricacies of its mechanism.   I=20
want to make a handwheel for the Allchin with five spokes and thought it =

might be rather interesting to use the dividing head to get the spokes=20
evenly divided.   This means using the worm and wheel to do the dividing =

(not the 24 holes in the worm wheel,  which allows easy dividing into =20
2,3,4,6,etc.,  but not five!).   I set it all up and I cannot see what=20
holds the plate (the plate with all the holes in it) from rotating?  =20
Clearly if this plate is free to rotate,  then the divisions can be=20
inaccurate.   Anyone have details as to how this should be stopped from=20
rotating?

     The best that I can do is to bolt on the subsidiary dividing worm,  =

as this engages with the smaller worm wheel which is attached to the=20
plate.   However I am sure there must be another way of holding the=20
plate from rotating.

    I am sure I have George Thomas's book on dividing,  which describes=20
the construction of this dividing head in some detail.   However do you=20
think I can find it?   Sod's Law is alive and thriving in this =
workshop!!

    I look forward to any input on this subject.


       Cheers,


          Roger Mason,  in a still sunny St. Agnes.

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