Gallery, Projects and General > Project Logs
Electronic Leadscrew for the New Lathe
awemawson:
So it IS a lathe that you are building, not a ladder! The dog'll be really pissed off :lol:
ps no problem threading using TurboCNC - converted my first Denford ORAC CNC lathe that way an awfully long time ago !
bertie_bassett:
my ideas are purely in my head and have never ben tested, so bear that in mind!
with regard to reversing the lead screw with the spindle :- a spare contact on the motor contactor or switch can easily be used to tell the stepper to reverse.
or if you have a thread dial indicator thingy, just leave the spindle running, release half nuts at end of thread, manually wind back the carriage, adjust cutting depth and reengage half nuts when dial tells you to.
seems simple in my head.
other musings:
iv often wondered if a stepper were to be driven by the spindle, could the resultant voltage produced be enough to use as a speed reference? plus the stepper could also be used to drive the head for indexing or very slow speeds??
vtsteam:
Eric, Something like that, yes, looks promising. :coffee:
Russell, sounds like a good principle and idea, but I need something that is working now. :beer:
JHovel, there's a thread in this forum devoted to the problem of inconsistent threads w/single spindle point pickup-- don't have the address of the thread offhand, search if interested... :coffee:
John S. figured you'd know..... :dremel:
Pekka, I think I might have already touched on most of the questions you asked so far, but simple threading, acme feedscrew, and the spindle motor will be a 2.25 hp (mfr rating) DC treadmill motor and DanFoss Cycletrol 150 controller. It does still have the big cast iron flywheel on the motor and, if it would be an advantage, I could retain that (though I hadn't planned on it). This is for my new abuilding 9"x12" heavy mini-lathe, I mean dog ladder. :)
Bertie, some interesting ideas there. :smart: But not a working circuit/software/firmware reality.
Andrew, lathe? What lathe? This is just a what if kinda thing......... :poke:
bertie_bassett:
this any good to you?
http://www.homemetalshopclub.org/projects/electronic_lead_screw/els.html
PekkaNF:
The more I think this at my point of view the more I'm inclined to build "simplified" ELS type feed to chooce the feeds and rely gears on threading, very tempted to calculate simple norton gearbox for 90% of the three/four mostly used lead.
Normal feed is not that demanding on lead accuracy and does not need all calculation for threading start/approach stuff and no temptation to try out any automatic cycles.
There is one manufacturer that uses timing belt on threading least one Wabeco and I have seen timing belt on one Austrian lathe (it also has a "tow hich" to feed the tail stock).
http://www.lathes.co.uk/wabeco/img18.gif
But I don't see really any benefit on timing belt spagethi.
Pekka
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