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Author Topic: Lathe controls  (Read 11390 times)

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Offline Hood

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Re: Lathe controls
« Reply #10 on: October 21, 2007, 05:41:48 PM »
I think Steve Blackmore on the Mach Yahoo group was going to be building or has built one, seem to remember he was going to post details but could be mistaken.
 The one on my lathe is original and hydraulic controlled and only moves in one direction.

Hood

Offline TT350

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Re: Lathe controls
« Reply #11 on: October 21, 2007, 06:23:17 PM »
If you run up on a link post it if you don't mind.

Offline Hood

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Re: Lathe controls
« Reply #12 on: October 21, 2007, 07:04:02 PM »
Been searching through the Yahoo group and all I could find was Steve mentioning that he was going to be starting again on his project, that was back in 2005 though and no mention since :(
 I did a quick google and found this, might be of some help.
http://www.issintl-inc.com/latheturret/
Hood

Offline TT350

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Re: Lathe controls
« Reply #13 on: October 21, 2007, 07:12:53 PM »
That's funny! I just save this to my deck top LOL!!!

Thanks!!

Offline TT350

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Re: Lathe controls
« Reply #14 on: October 22, 2007, 11:25:39 PM »
Well I've been doing some digging and found out that a spindle encoder is required to be able
to do treading and from what I found out it hooks into a brakeout board or something.

So I really don't won't to go monkeying around with the boards in my mill.

I have decided build the whole thing from scratch so I need you guys to
help me with what's needed as far as brake out boards drives and power supply.

My plan is to put steppers on it,1200oz on the Z and 640oz on the X.
If some one could put me a shopping together that would great!

Thanks again guys
Chris
« Last Edit: October 22, 2007, 11:31:08 PM by TT350 »

Offline zarzul

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Re: Lathe controls
« Reply #15 on: October 23, 2007, 10:27:43 AM »
How big is your lathe?

Offline TT350

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Re: Lathe controls
« Reply #16 on: October 23, 2007, 11:27:56 AM »
14x40 import.

This is my lathe. http://www.billstoolcrib.com/CT1440.htm

Offline Hood

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Re: Lathe controls
« Reply #17 on: October 23, 2007, 03:56:19 PM »
You could probably get away with smaller motors but depends on what you are gearing them I suppose.
 You will need a power supply, you can make one quite easily out of a transformer a capacitor and a rectifier. Bob Campbell has a good pdf on this, see here http://campbelldesigns.com/files/power-supply-part-1.pdf
 You will also need a breakout board, some drives and some limit switches. I like Gecko drives for steppers, have tried some others but the Geckos are way ahead of the others I tried. Then again the other ones I tried were cheap crap so ........
 Limit switches can be of many types but if you want accurate homing then optical ones are good. Its easy enough to make your own optical limits up, bit of work if you use coolant as you will need to make a case for them that is waterproof but if you dont use coolant then just some shields should do.

Hood

Offline TT350

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Re: Lathe controls
« Reply #18 on: October 27, 2007, 07:43:22 PM »
What size steppers would use for the Z&X?  Ball screw leed .200 on the Z and .125 on the X

Offline Hood

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Re: Lathe controls
« Reply #19 on: October 27, 2007, 08:30:21 PM »
are you gearing them or direct drive? what kind of rapids are you wanting?
 Reason I ask is I have 916 oz/in on my Bridgeport Boss , they are geared 2:1 but they have more than enough torque,  they would have enough torque to direct drive them. The rapids I get are 2500mm/min (100IPM) which is more than enough for the short travels on the mill and is the reason I have not changed to direct drive.

Hood