[tachus42]

The circuit has a softstart and a undervoltage lockout so it should be ok to switch the supply. Still it woult be wise to set the speed to low before turning it on.

[mike3]

in any instance .. Tachus42 you have been an very great help .. thanks... and you too Bunalmis ... Great Guys... and Mark .. I don't have any experience in machining .. so after I learn more about the Lathe .. I will take you up on the CNC offer.. is there any books you recomend to learn machining .. I have a few .. I have , Machine Shop tools & operations 5th ed, by Rex Miller & Mark Miller .. and The home Machinist's Handbook .. by Doug Briney .. and for cnc I have 7 Easy steps to CNC programing .. also if you do the Eagle circuit board drawing with the Mod by Bunalmis.. could I get a copy of the file ... I started it point to point on a perfboard without Bunalmis's Mod...which will be ok for now but I would like to do it neater .. Thanks... Mike ...

[RotarySMP]

What trace width would be recommended on the power traces of this circuit if it is built to power a 100V 250W motor?

Might be a while before I get a chance to do this eagle layout of this circuit (I won't actually need the controller until I start making my tool post grinder, unless I toast the standard mini lathe one!).

I don't have any machining books, but try your local library. Most have a stash of machining texts in their model section.The Villiage Press has a bunch of the British home machinist books from the 50's and 60's which I liked.

The main thing is just to get stuck in a try stuff.

There is a ton of machining information on the web. A good reference are the yahoo groups started by JW Early. He has been scanning in articles from old model engineering magazines and saving them in the files sections:
http://groups.yahoo.com/group/mlprojects/ - this one has an idex to the different groups.

http://groups.yahoo.com/group/mwlatheideas/
This is where I got the idea for my T slot cross slide:
http://www.wrathall.com/Interests/ma...oss_slide1.htm

http://groups.yahoo.com/group/mwhints/files/
http://groups.yahoo.com/group/mwhints2/files/

[tachus42]

There is a online calculator for pcb trace width here:http://www.desmith.com/NMdS/Electronics/TraceWidth.html
250Watts/100Volts is only 2.5 amps so 0.1 should be fine.

[RotarySMP]

Thanks, That makes things easier.