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Leadscrew nut material

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John Rudd:
What are the preferences for material for making leadscrew nuts from?
I'd like to make new one for my Ajax mill's Y axis which has been bastardised.....Its been cut with a BSW thread which Im sure isnt original....

The material used looks like Phos B.....but to buy a piece the same size is going to be a kings ransom....

How about cast iron? ( meehanite? )

Fergus OMore:
John

Will it tin?. I did one years ago on a Pools Major lathe with a thin tinning with the feed screw in but it was covered in soot to stop the lead/tin sticking.

You'll need a lot of muscle to free the screw but it does work.


Why not try it

The alternative is to put a split in the nut- and nip it up.

Hope this helps

Norman

John Rudd:
Norman,
The issue is the block that forms the nut is about 1" thick and measures approx 1-3/4 square....

It looks like it has been fashioned from an offcut or scrap piece of phos-b....then a hole drilled and threaded 3/4 bsw....I dont believe the thread is original....so my plan is to make a new lead screw and nut with a finer thread....either bsf or bsc....

awemawson:
Would it not be more satisfactory to buy a length of trapezoidal threaded bar and matching nut, and fit the nut to your existing one?

something similar to:

http://www.ebay.co.uk/itm/Ultimaker-DIY-Trapezoidal-Lead-Screw-Nut-Kit-Z-Axis-T12-3-Screw-Rod-for-3D-/151498865030?hash=item2346093986

Halifax Rack & Screw carry loads of Metric and Imperial lead screws and nuts:

http://www.hrs-ccl.co.uk/

Bluechip:

--- Quote from: awemawson on October 14, 2015, 10:23:07 AM ---Halifax Rack & Screw

--- End quote ---

Can we Pre-book or do we have to queue up behind all the politicians and clergy ???

Dave

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