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Headstock Spindle Back Stop

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PeterE:
Seeing or reading about attachments and accessories that can/should/is required when making stuff in my workshop always starts a kind of solution process. At this time it started off when I read about and saw Stilldrillinīs (Daveīs) simple back stop for the spindle. I will need something like that in a while to make the support pillars for the Trojan.

Daveīs idea is just one of several, and I have the GHT  workshop book with another solution. The third version appeared in MEW as an extension for the C3 headstock dividing attachment.  Hmmm I have to make a choice  :scratch: 

What I want to achieve is something that answers as many as possible of the following:

* Easy to both attach and remove
* No banging or thumping to spare the spindle bearings
* Wide range of length making use of as much of the 215 mm long spindle as possible.
* Includes a dividing gear that is positioned to utilize the already existing stop.
* Can be exchanged for a back-end spider for long pieces.
* As large diameter as possible.
* Easy to make on the C3
The internal diameter of my spindle (C3) is 20,5 mm so around 15 to 16 mm free inner diameter all through the spindle would be good. The chuck end MT3 taper ends 70 mm in from the chuck and is around 23,7 mm at the edge.

My thought is to go the GHT way by making a "pipe with 15 mm inner diameter and just under 20,5 mm to pass through with a shoulder 25 mm diameter at the front end. The back end is a large nut with a 60 tooth gear attached and attachments for either back-stop or spider. Something like below.

Picture went bad :palm: New coming tomorrow as drawing is on another machine (at work). When picture updated in P-bucket it will automatically show.


I hope you can de-cipher the sketch. It is not finished yet as this is where the idea stopped for the moment.

Comments?

BR

/Peter

Fergus OMore:
Two more books- Peter :coffee:
One is GHT's Workshop Techniques- which brings in Dividing and Graduating and then GHT's old friend Jack A Radford from New Zealand's book.

What you really have is in Classical English- a Nest of Singing Birds- all inspiring each other.
Chaddock, Cleeve, Tubal Cain, GHT, Ned Westbury, Bradley, Hallows and dear old Sparey.

My collection of earlier references went to the 'poubelle' today but I kept my Hozapffels-- just in case.

Worth every euro! :bow:

Jonny:
Does the spindle protrude at all?
If so could clamp up off o/d that and in turn not limit what you can get up the spout.

PeterE:
Fergus,

I have both the GHT Workshop Techniques and the Radford Accessories to your lathe. Goldmines in ideas!

Jonny,

Very good comment!  :thumbup: I know th free end at the back end of the spindle (to the left in the picture) is only a short piece, somwewhere around 5-ish mm or so. It has a 27x1.5 mm thread asused for the spindle lock nuts.

But the idea is very worth looking closer into. Have to measure a bit more because the existing distance is a bit short really for a good and secure grip by just threading, it would probably need something to lock the "nut" if used.

Hmmmm.

Have to think a bit more ....

BR

/Peter

PeterE:
Had to find out more closely on how it actually looks and to get some measures.


As can be seen, the end of the spindle only protrudes a small amount after the spindle lock nuts. The protrusion is 3.7 mm or about 9/64-ish. With a thread having a pitch of 1.5 mm that would make two threads which I regard as far too little for a useful grip.

I have some memory of at least three threads to get a good grip but preferable more. To get more space I could of course thin the lock nuts a shade. As delivered they are 7.5 mm wide (5 threads) each. If I thin them down by 1.5 mm (1 thread) I will get just over 6.5 mm free end (=4 threads) which well could work.

I really do not want to exchange one of the lock nuts for a special as my though with the attachment is to make it detachable and exchangeable for a similar with other functionality. With this in mind, a screw-on attachment with a separate lock (set) screw would probably work.

If that route is not the way to go, I think I will stick to my original idea, hmmmmm  :scratch:

BR

/Peter

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