4755 forum posts
Our CNC inspired bretheren will know all about this stuff already but less informed users like myself may not be aware of the huge range of potential leadscrews out there at not-alot-of-money prices just now
trapezoidal rod is very easy to obtain and can be used for upgrading almost any old lathe with a knackered leadscrew and comes in lengths of up to 3 metres from the usual suspects as well as the wider net
It's all metric of course but it's never been easier or cheaper to sort out a leadscrew issue
Edited By Ady1 on 04/01/2021 07:42:30
|Chris Evans 6||04/01/2021 10:39:43|
1960 forum posts
I concur, some years ago I bought a 1 metre length of leadscrew and two bronze nuts for around £65/£70 (memory ?) I had enough to replace the cross slide screw on my lathe plus make up a spare screw and nut. I still have the spare and a bit of the unused leadscrew.
|2267 forum posts|
Has anyone done this to a Myford Seven and, if so, how did they replace the half nuts?
|William Chitham||04/01/2021 11:26:03|
|125 forum posts|
Can't find 2.5mm pitch for us Boxford owners though.
1099 forum posts
This may also be of interest **LINK** for imperial screws etc
|Roger Best||04/01/2021 18:19:36|
|306 forum posts|
Good question, half nuts are often complex castings made using jigs. I assume Chris Evans 6 has a more sensible machine.
21468 forum posts
Should not be too hard to machine down an off the shelf nut, split it in half and silver solder to another bit of bronze that can be shaped to match the rest of the cast item.
|old mart||04/01/2021 18:34:08|
|3351 forum posts|
The museum's Smart & Brown model A has a 3mm pitch cross slide leadscrew with two long bronze nuts and as the machine is imperial, the scale is now 0-118 instead of the original leadscrews 8tpi 0-125. Backlash is set at 0.001".
Edited By old mart on 04/01/2021 18:35:00
|old mart||04/01/2021 19:04:21|
|3351 forum posts|
I have bookmarked the ABSSAC link from JohnF as I was interested in the 1 x 5 ACME and will probably check whether LH is available and for the price of a couple of feet. It would be for the Tom Senior knee which I have tooled up to make nuts for when the CO19 allows.
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