I use double nutted ball screws . Get the nut preloaded and be sure to run an oil line to the nut. Be sure the end bearings are in good shape and preloaded.
Hi,
A year ago I installed Chinese single ball nuts on X and Y. I know, they are Chinese after all but outside the machine they felt not tight but not loose either. So I installed them. Now I have 0.0875mm backlash on the X and 0.1375mm on the Y which I believe is far from acceptable.
Is there anything I can do to tune up and decrease the backlash to an acceptable range (what range is acceptable anyway?) or is double ball nut the only way to go?
Best,
Suat
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Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
I use double nutted ball screws . Get the nut preloaded and be sure to run an oil line to the nut. Be sure the end bearings are in good shape and preloaded.
Sounds about right. You should fit double (DFU) nuts and AC bearings/carriers. The problem is that those single nuts generally have a slight wobble. Feel OK when they're off but once on the machine the wobble creates a delay in carriage movement. You could find some oversized balls to re-ball the nuts, but DFU is the way to go. You can also pack a DFU's spacer with thin tin-foil/aluminium-foil to make it tighter. Not much you can do with a single.
I had single on the minimill and had exactly the same results. So,I fitted DFU and AC bearings (in custom bearing blocks) onto a new 25LV mill. Tightened the DFU using the foil method. I'm down to 0.025mm on both axis.
Last edited by dazp1976; 10-18-2022 at 04:26 PM.
Actually I already have DFU's but problem is that I don't have a second mill to remove the material to make them fit. My best option is tu use a die grinder for it.
Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
OK I'll give it a try. Thanks @dazp1976 and @gabedrummin
Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
Hello again,
I cut the X axis DFU flange. Now I'll make a locking mount for it.
PS: I did cut ball nuts in the past but this one was unbelievably hard. I broke 4 cutting inserts to get it done.
Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
Here's the X axis ball nut housing (or mount) I just made. It takes the first part and one third of the second part DFU 1605. The only thing I'm concern is that I made it off aluminum. Should I make a new one using steel?
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Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
I'm surprised how this jigsaw cut cast iron like butter.
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Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
I also changed the oil lines for m 6mm to 4mm. I'd like to use copper tubes instead but I never had luck with them.
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Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby
I put the machine all together. Now I measure 0.0213mm on both axes. However I noticed the long 2 segment arm of the magnetic base for the dial indicator is moving a little when the dial pin touches the gantry. So the backlash could be even smaller.
Suat
Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby