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| Building a small and simple dividing head - CNC/Kwackers driven |
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| raynerd:
Hello, I don`t often post before I have something to show, but I`m making an exception here as I need some advice! I have a really lovely Rawyler Swiss made Horizontal miller that I want to use for pinion and gear cutting and I`m needing to make a divider and I will be runing this on one of Kwackers CNC index controllers that is built and ready waiting. Pictures tomorrow (well, OK, I do have something I could have shown!!). I need to keep costs to a minimum and use things I already have as much as possible so please bear that in mind. I intend to make something fairly simple like our very own madmodder, Dean made on his website... I`m not showing this as an image..because IT IS NOT MY PICTURE!!, this belongs to deansphotographica: http://www.deansphotographica.com/machining/projects/divider/1stassy.jpg I have all ready and waiting: straight 16mm shank ER16 collet chuck 16mm ID olite bushes cast iron block 50 x 50 x45mm which will need raising another 30mm on a ally base 120:1 suitable sized worm and wheel Using the straight shank er16 chuck straight out of the box, if I bored he cast iron block for the bushes, I`d have an instant spindle! Then by mounting the worm wheel directly on the shaft, I could then use some mounting brackets to mount the worm above or below the wheel and I`d end up with something directly like Dean has made.... BUT .... .... I intend to drive this off a stepper motor. Now it only is a tiny thing with very small mounting holes, spaced in a square 31mm x 31mm. My problem is, if you look at the image above, I`d not have any material to mount the motor bracket/motor onto! In an ideal world I`d have the motor running directly being the dividing head, inline with the spindle and table but I`m guessing that would be an aweful lot more work to rotate the worm shaft by 90 again to get the rotation back parallel with the spindle! I`d just like any thoughts or suggestions or build ideas. Especially how to mount the motor and worm arrangement. Chris |
| Scuba1:
You got any pictures of the worm gear box ? As that would help a bit with making suggestions ATB Michael |
| raynerd:
Scuba, it isn`t a box... I simply have a worm wheel which is about 60mm dia, the worm which is on about a 6mm shaft and then a block for the main body...plus other materials to make brackets etc. If you look at the picture I linked to, then I`ll end up with a setup similar to that... it is just how to mount the motor as there isn`t much material around it to locate a motor bracket onto!! Any thoughts? Chris |
| Raggle:
This page by Tony Jeffree should interest you. http://www.jeffree.co.uk/pages/divheadmk2.html This version of his dividing head (there is a simpler, earlier one) has 2 modes to drive the worm, plate and arms or stepper motor. You unbolt one system and bolt on the other. Hope this helps Ray |
| raynerd:
Ray...fantastic!! To be honest, it is the only sort of arrangement that I was thinking about...just looked a bit too faffy in my head!! lol That page shows that it can clearly be done!! Many many thanks!! Chris |
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