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Dividing Head / Rotary Table

Discussion in 'SHOP-MADE TOOLING' started by Surprman, Apr 9, 2017.

  1. Surprman

    Surprman United States Active User Active Member

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    I have been posting my initial efforts in the "what did you do in your shop today" thread, but since I am getting farther along I figured I would put it in my own post. My motivation for making this stems from the fact my milling machine is small and even the poor quality Chinese dividing heads are pretty expensive - plus it seems like a fun project. I am focused on making the critical items first and then will design the rest of the unit around them. The critical items are: the worm/worm gear and the spindle. I've had some good luck with making the worm/worm gear. I've made a hob and tested it out on an aluminum blank. Even though I messed up the orientation of he slots in the gashing operation, it still came out good. I am waiting on getting a piece of brass from my friend to make the final gear. (I'm going with a 40:1 ratio).

    Yesterday I figured I would create the final worm (since I still had the gears set-up on the lathe from making the hob). It came out great. I learned something in the process. I was turning the part between centers. Don't try to part off while turning in this manner. Luckily it only slightly marred the edge of the cut when it bent the remaining stump and halted the spindle (belt drives are my friend). Until my brass arrives I am going to work on my spindle. My plan is to kind-of replicate the design of my SB 9C lathe. I want to have the same thread so I can use my existing 3 and 4 jaw chuck plus a faceplate (when I eventually get one). I also have a nice set of 3C collets so I will be boring out the spindle to accept those. I want to be able to use this in the horizontal and vertical orientation, but if that is not doable, I will just make a separate rotary table later- on. I plan to be using some of the ideas that I have seen in some of the other posts on this site as I design this and I'll reference them as I go along.
     

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    royesses, savarin and rdean like this.
  2. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    Nice job on the hob and the worm and worm gear! You are correct, parting when the part is trapped by a center is not a good idea!
     
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  3. Surprman

    Surprman United States Active User Active Member

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    I am making the spindle for my dividing head now and had a lot of meat to take off. I decided to be a little more aggressive with the amount of metal I took off per pass. I went up to 0.150 depth of cut with the back gear engaged. Man - it took that off like it was nothing! It helps that I ground my tool properly and have it in my new Aloris tool post. My swarf looks almost like the examples in the SB "How to run a Lathe book". (Up until now I've been conservative and most of my swarf has been tiny shavings with lots of passes.). I like running the lathe even more now! I included a picture of the stock I started out with. (Got to use my HF 4x6 bandsaw to cut it to size - so nice. I had cut the stock on both sides previously with a bi-metal blade in a saws-all. I still remember how difficult that was! A little better than a hacksaw , but not much!)
     

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