Hi all been busy this summer - back for a while,-
Wowwee. Test run yesterday of the Stevo Eee-lec-tronik hobber. Quick run down on what this is. Simply put it's a stepper driven dividing head that reads the impulses from an arbor driven shaft encoder vis a 'black box' [ nothing to do with Niomie Campbell ] Using this idea does away with a complex gear train between the arbor and the dividing head making setup times quicker. Managed to get the stepper driven head mounted on the horizontal mill table in between customers calling and ringing up and generally being a pain. Finished tidying the wiring for the driver box and connected this to the head and the arbor driven encoder. Found some scrap brass blanks and a decent 12 DP gear hob so I turned three blanks up all the same. Fitted the blanks to the stepper head and set the table over by 3 degrees 20 minutes which is the lead angle of the hob. Set the depth, wound clear and started this up, amazing to see it start cutting and all the while you are expecting this to run all the teeth off. First one off had wavy teeth because I'd forgotten to tighten the blank up. I won't mention what happened to the second one After all this is ONLY a test run, isn't it ? Turned all three blanks down to get rid of the mistakes and restarted using fewer teeth No problems this time. I've put some pics on my web space, 10 in all Just keep changing the last number from indexer1 thru to indexer10Pics 1 and 2 are the head being built up and 3 is the driver box rated at 67 volts and 4 amps. Pic 4 is an overall view of the setup on the Victoria mill. Pic 5 is a close up of a 12DP 21 tooth gear being cut. Pic 6 is a close up of the finished driver box with plugs fitted but before painting. Pic 7 is similar to pic 4. Pic 8 is a nice one. It shows three gears I cut tonight, all the same size OD but they have 20, 21 and 22 teeth on them and they all mesh together perfectly, only the 21T is the correct standard. These are 12 DP cut in brass. Pic 9 is a close up of the finish obtained. Pic 10 is a 20DP nylon gear of 52 teeth. Ironically I cut this for a friend with a Micron hobber who's missing a 52 tooth gear and he needs a 52 tooth to make one !!
This pic is 4 Myford 21T metric gears that took 8 minutes to cut the 4 gears.John S.
Duct tape is like the Force. It has a light side and a dark side, and it holds the universe together.