Member postings for uli Schnelzer

I remember several articles of Gear hobbing in ME and MEW. in one they use the DP thread cutting feature of the machine to drive the hob. And then the building of a complete one purpose hobber in MEW iirc from the numbers 245. At the moment I try to make a similar project with my little Emco C5. I want a life toolholder from a CNC lathe with a motor and an encoder. The measure of the encoder will divide with an arduino or simpler an oldschool ttl-ic circuit to the desired tooth number.

If I use an 500 cpr encoder so I get 2000 peeks/rev with the decoupled spindelmotor. I want to drive the spindle with a 10/1 geared stepper motor, so I get 2000 steps/rev of the hob. The divider give 1 peek out per tooth of the gear. the feed of the machine can be made with the normal feed of the machine from the spindle.

The biggest problem for me, is the electronic part. It were good, if I can start with the index peek from spindle and hob encoder, so I can go a bit deeper, if the geartooth isn't deep enough, but I haven't any idea, how I can realise this.

Edited By uli Schnelzer on 15/04/2022 10:13:36

I know, it's gravedigging. long long ago, I had the same problem with my C5. I added a polechanger switch to reverse the rotation of the motor, but without a neutral position between. That has killed one or more of the 5

TO- 220 parts on the small side of the Motor controller mounted to the aluminium angle. 2 and 3 are the same 1 a transistor and the other a rectifier. Because I don't have the possibilities to test the parts in the circuit, I changed all 5 parts and the motor is running again. Later I changed the direction switch to a type with a neutral middle position. since then I wait until the spindle standstill, no other Issue happend.