zarzul, although I dont need it at the moment you never know what the future holds so would appreciate if you could give the chip number. Is there anything else needed such as resistors or is it just a case of wiring direct to the chip?
Hood

it is a real simple chip,  NTE 2631,  it is a quad input differential line driver,  you can do up to 4 channels of differential output,  4 inputs.   No resistors needed.

Works great, if you need a work-around before getting one you can slave an axis and invert it to get the same thing if you have a lot of outputs and bandwidth to spare.

Thanks zarzul, cant see that one in the normal suppliers in the UK but there are others such as this http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=0630875
Not too hot on electronics (although they usually are after I have had them ) is that the kind of thing?
Hood

That the baby, should work fine.

great, might grab myself a few just in case my BOB smokes at some point as I like the differential Step/Dir :0
Hood

If you now have a servo motor for the spindle, how are you controlling the speed?  From what I understand, if you have is set for axis A, B or C you can't set it up as a spindle.

Vince

Have it set as the spindle and the drive accepts step/dir so spindle speed is just set via the normal S word and Dir is M3 or M5 like normal.
Hood

Well after a long time sitting in the back workshop I have finally got time to get the turret fitted to the front of the lathe instead of the 4 position toolpost. I now have 12 tool positions, 6 on rear  turret and 6 on front. The rear turret is slow as it only rotates one way and has to clamp every tool. The front turret I have converted to servo motor indexing and can rotate both ways and go direct to the programmed tool. Still have to make a cover for it and make sure the bars are on centre exactly but it seems to be working well now after initial teething problems.
The other great thing about this turret is the tool holders fit on to the  dovetails and are very accurate so I can set up different tools and just have them sitting ready to replace the current tools if I need them.
 The turret originally came off a Bullard twin turret lathe that my friend was scrapping.
In the video I am running a programme with tool changes and 2 second dwell between each one and have it looping with a M47
http://www.youtube.com/watch?v=geD2jbW9hUY
Hood

very interesting.
 i dont work Until now with lathe but i think is very different .
thx

Amir

Yes I thought working a lathe would be easier than a mill as you only have two axis but it is much more to think about.
Hood