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| Building a small and simple dividing head - CNC/Kwackers driven |
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| raynerd:
When you say a slug, so you mean so basically your screw is actually pushing down on a copper piece that is actually locking onto the spindle? only problem I`ll have is that the spindle is 12mm and it is running in bushes that are 16mm. The is a slight gap between the front and rear bush, therefore the location of the locking screw will probably end up in the middle, meaning there will actually be a 2mm gap between the the spindle and the wall of the block...I guess this just means that the copper slug would need to be a minmum of 3mm or so, so that it doesn`t fall out of position. Would copper be best or would brass do. Chris |
| Fergus OMore:
Literally bung something tightly into the drilled end of the stop which is not going to bruise your spindle. Copper or brass or aluminium at a pinch. As you rightly remark, it is only to lock the spindle-- without causing damage. A lot of us use a detent which is a plunger to fit into the index wheel which is graduated into 24 holes. So you can do multiples of 15 degrees without have to screw down to lock the spindle. Myford super 7 owners often do this on the bullwheel which is 60 tooth so that you can get 120 divisions- using the bottom and top of the teeth. You can also put division plates on the bullwheel with a worm but also a micro-attachment which will do things which the plates don't cover. 'Fraid your machine is too complicated for an ancient geyser to play with. However, enjoy it! |
| andyf:
Hi Chris, Rather than trying to clamp the spindle itself, could you arrange some sort of a clamp screw which pushes a concave brass pad down on to the collet chuck, just forward of the two flats on it? Andy |
| Fergus OMore:
I always risk getting 'chopped' but my versatile dividing head is a George Thomas affair- which uses a pair of split cotters and a ball handle for fast tightenning and subsequent quick release. I fitted the same sort of thing to my Quorn tool and cutter grinder. You could fit a pair of split cotters of brass- with a ball handle. Put gilt on the ginger bread? :poke: |
| Anzaniste:
I find that a hole in the end of a locking screw to take a domed copper rivet is a nice simple solution. |
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