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The ongoing saga of John's floor

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John Stevenson11/06/2011 17:12:37
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5068 forum posts
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Watch the lips.
 
NO SPARE BIT OF THREAD, JUST THE 4' SCREW.
 
Tony mentioned the cast method using Moglice and whilst I can't see a problem with it I don't have any and couldn't wait for a delivery.
 
Old nut not usable, it was in made two pieces, one piece threaded into the alloy retainer, M24 x 1.5 and the other somehow fasted to it to form an adjustable anti backlash arrangement but something had broken off when it completely stripped the thread out of one half and the other has about 1/4" of linear play.
 
Amazing how it had managed to keep working.
 
The new nut is black oil filled Delrin.
 
John S.
Versaboss11/06/2011 22:58:59
512 forum posts
77 photos

Aah, Delrin!

So you possibly warmed the screw to 150 or so deg. and pressed two pre-formed oversize Delrin blocks around the screw? After this, machine the outside(s) to measure.

Greetings, Hansrudolf

John Stevenson11/06/2011 23:32:05
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5068 forum posts
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Hansrudolf nearly has it.
 
Been around for a while and I believe it was 'discovered' by a guy called Darryl on the Practical Machinist forum to give the correct credits.
 
Get a block of Delrin and bore a hole thru it with a diameter halfway between the OD and the root diameter, in my case this was 7/16", not too critical, then split the block from one side to the centre.
 
Open the gap up with a couple of screwdrivers and force the screw in with about 3" or so sticking out one end.
 
Then clamp the split up in the vise and heat the screw with a hot air gun equally from both sides and keep the vise tight. Eventually after about 20 minutes the gap will be closed and you will see some melted Delrin at the ends.
 
DO NOT try to wind the screw thru as it will rip the thread out, it needs to be static.
 
Once done and cooled down in my case I drilled for two clamp screws and one central jacking grubscrew so the preload can be set.
 
John S.
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