conning tower nut #MODS
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Les and forum.
Please see attachments.not in any order. I will ask Charlie to send photos (jpg?s) of the nut installed as i cant find any in my files. I made 2 versions, solid cast iron and a 2 part phosphor bronze which i prefer. The CI nut was back bored to produce the spigot with a Whaulopter "wally" boring head. A full article is available from?Home Shop Machinist, I am sure G Bulliss editor and forum member will oblige if you need any further help Charlie meticulously prepared the article for publication as he is brilliant at this technical write up stuff, I am useless, also he fitted a conning tower nut to his lathe. Hope of interest? -- John |
¿ªÔÆÌåÓýCharlie,
Is this the "CONNING TOWER"
nut?---Edited photo attempted to be attached-
Little Machine shop says this is a
locking lever
This is what I thought was a "CONNING
TOWER" nut, Am I missing something??
I thought ----Conning Tower on a
submarine.....
On 10/9/2019 8:02 AM, CLevinski wrote:
John,
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Hi, Jon,
Sorry, I should have been more specific.? A conning tower nut is a nut that is threaded on to the cross-slide lead screw and actually moves the cross-slide.? As the lathe is originally delivered, the cross-slide nut that is used makes a poor connection to the cross-slide.? Many industrial lathes use a nut that has a high spigot (the entire nut looks a bit like a submarine conning tower, hence the name).? This spigot engages a matching opening in the cross-slide, ensuring a far more secure connection.? I have attached a few pictures I took during the implementation of mine which I hope will help make matters clear. The lowest picture below shows the original cross-slide nut on the left, and the conning tower nut on the right. The first picture below shows the conning tower nut on the cross-slide lead screw without the cross-slide.? Please note that my lead screw looks short because I have a cross-slide extension installed.? (Note: photo accidentally deleted on 11/23/2019.? See post of that date, which shows the missing photo.) The second picture below, (sorry, I haven't quite worked out yet how to put the photos in my desired order when I load them), shows the "conning tower" fully engaged in the cross-slide.? Please note that the conning tower in this photo is too high for this particular cross-slide.? It was necessary to reduce the height of this conning tower so the flat head screw shown near the conning tower could be properly installed and adjust the nut height, keeping the lead screw properly aligned throughout its travel. I hope this helps clarify matters... -- Regards, Charlie New Jersey, USA |
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Hi i liked your conning tower idea but I was already making a special nut with a delrin? insert see pics I apologise for poor quality and detail. Essential I used a 20 x 16 x 30 steel block with three clamping 3mm cap screw this was bored out to 13mm to receive a 13mm delrin bush tapped to m10 LH. It uses the original locating boss Regards Les
On Sunday, 20 October 2019, 06:42:00 BST, John Lindo <bechetboat@...> wrote:
Les. Playing catch up with the forum. Are you now OK with the principles of the "conning tower" nut. I called it that as it looks like a submarine LOL. I see Charlie attached some good photo?s, this saves digging out mine from 7 years ago. If in doubt please yell out. -- John |
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Hi found another pic. The nut is effectively twice as long as the original? and so far pleased with effectively no backlash. I don't know about the longevity of the delrin but I can make inserts easily and if all fails I make a bronze nut. I also fitted double ball thrust bearings as well? Regards Les
On Sunday, 20 October 2019, 11:13:39 BST, les higgins via Groups.Io <leshiggins@...> wrote:
Hi i liked your conning tower idea but I was already making a special nut with a delrin? insert see pics I apologise for poor quality and detail. Essential I used a 20 x 16 x 30 steel block with three clamping 3mm cap screw this was bored out to 13mm to receive a 13mm delrin bush tapped to m10 LH. It uses the original locating boss Regards Les
On Sunday, 20 October 2019, 06:42:00 BST, John Lindo <bechetboat@...> wrote:
Les. Playing catch up with the forum. Are you now OK with the principles of the "conning tower" nut. I called it that as it looks like a submarine LOL. I see Charlie attached some good photo?s, this saves digging out mine from 7 years ago. If in doubt please yell out. -- John |
John Lindo
