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| Building a small and simple dividing head - CNC/Kwackers driven |
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| John Stevenson:
Chris, What about just getting one of those cheap reduction gearboxes that fit on electric motors and bung a stepper motor on and a chuck or something up the spout. Sort one out in a day. John S. |
| raynerd:
Hey John, would certainly be a good idea if I had one lying around. I`m not sure what size they are but my little 4" rotab is too big for the machine which is why I`m having to make something smaller. I wouldn`t have thought of using one and certainly something I`ll consider doing if I ever come across one at a good price. Chris |
| Dean W:
Hi Chris; You can use my pictures here, if you'd like. Thanks for thinking about that, though! I see you need to raise the finished divider some to work on your machine. You mention 30mm. I don't know how critical that measurement is, but if you have some leeway, you could use an inexpensive 1-2-3 block and mount your divider body to it. That's how I do mine. The block will also give you some mounting options for your stepper motor, I think. They have plenty of holes in them! If it would be more convenient to mount your stepper directly to the spindle, you can use a simple eccentric on the ends of the worm shaft, so it can be rotated down to disengage from the large gear. Then you would have the option of using the worm reduction manually, or disengage it for use with the stepper. Just a thought. Dean |
| raynerd:
Made a good start. Now the near side worm mounting block is to be replaced with something bigger to allow the mounting of the stepper. The spindle is an ER16 straight shank 16mm at was no price at all. Squared it up as John/Bogs showed us how in his minimag build. Some of the best advice ever given. 4 jaw for boring: Lump of ally for the base was then cut and milled to size and shape: The picture below shows the top sitting on the base. It has now been tapped in each corner and bolted through from below. And now with the worm wheel attached and spindle mounted. It is turning nicely so looks like it will work just fine. |
| John Stevenson:
Looking good, don't forget to work out some sort of cover for the worm and wheel to stop chips jamming it. I know it's not finished but easy to overlook in the heat of the moment. John S. |
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