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27-09-2013 #1
Hi all
I run a HOBBYMAT BFE65 vertical milling machine c.1984. I am looking to fit anti backlash nuts, but i seem to have hit a problem, Does anyone in CNC land know exactly what the Lead-screws are? i have measured them at 14 mm outside diameter, single start with a 2 mm pitch per single evolution, the problem is i am having difficulty finding out if they are ACME, METRIC or TRAPEZOIDAL, and i can only find 3 mm pitch on the internet (TR14 3)
Any help on this subject would be very helpful.
Regards
Ray
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08-05-2014 #2
Ray did you ever get an answer to this?
.Me.Me
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08-05-2014 #3
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08-05-2014 #4
If the pitch is metric the leadscrew is Trapazoidal(Trapazoidal is the metric version of Acme)
Not all the pitches are show on the charts i had a look @. I was looking for data for turning an M8 x 2 leadscrew and couldn't find it,fortunatelly i have a tap and will make the nut first and leadscrew to suit.
MikeLast edited by mekanik; 08-05-2014 at 03:29 PM.
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The Following User Says Thank You to mekanik For This Useful Post:
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08-05-2014 #5
Many Thanks Mick.
I have not fitted backlash nuts yet, but this info will be valuable for the future.
Regards
Ray
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09-05-2014 #6
Hi Ray,
Why not replacing the leadscrew all together with a known diameter / pitch?
Trapezoidal screws are fairly cheap these days.
RNR
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09-05-2014 #7
It's all well and good doing that but as a rule there's an indicator dial on the end of it so you need to make a new one. i am replacing a 1mm pitch screw so bought 2mm pitch tap so can go off half a division of dial. As it's for the topslide it only gets used for doing facing cuts and infeed when screw cutting. you could get a 4mm screw and do the same.
Mike
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