Steven Kane | 07/05/2020 20:04:52 |
4 forum posts | I will take the top slide off tomorrow and have a look at the gib strip and try flattening it and polishing it to see what the difference is. It may well be wear in the top slide which I will have to get sorted. Thanks for all you comments! Steven |
Pete. | 08/05/2020 00:29:00 |
![]() 910 forum posts 303 photos | Posted by SillyOldDuffer on 07/05/2020 12:59:20:
Posted by Steviegtr on 07/05/2020 01:12:39:
My take on this, is that a gib strip runs on usually cast iron. we all know from metallurgy that for 2 metal rubbing together that one would be made from a hard metal substance & one from a soft substance. Hence my reasoning of cast iron to Phosphor bronze. Especially as the bronze can be oilite. It will stay lubricated for longer than any other metal. Or is it too soft & would not pack correctly. Silly old duffer will have an answer in the morning I am sure that will blow my theory away. Steve. Theory safe, but I can fill in some of the whys and wherefores! Not due to my natural genius, but I do have a collection of books!
Of these, not galling, generally means a bearing must be made of two different metals. The book says the main exceptions are: cast-iron may be run against cast-iron, and mild-steel may be run against hardened steel. Not any pair of different metals work without galling, examples of OK pairs given are:
So Phosphor Bronze is OTT for lathe gibs, cast-iron more likely, maybe mild-steel for cheapness, or brass because it can be polished. Big machine slides might be different, but gibs don't generally have to cope with high-pressure, high-loads, or high-speed. Be fun to fit silver gibs, massive boasting rights, and it would deter vampires! Dave Dave Thank you for taking the time to type that out, some interesting info there. |
Hopper | 08/05/2020 01:25:46 |
![]() 7881 forum posts 397 photos | Cast iron gibs would crack. |
Steven Kane | 10/05/2020 13:34:21 |
4 forum posts | I took the top slide off yesterday and decided that while it was apart, I would take the opportunity to clean it, sand the painted areas and prime it ready for finishing coats of Myford gray. The gib strip in the top slide looks to be in quite good condition, but I will flatten and polish it and see then if the slide ways are worn or not! In the week I shall be taking off the cross slide and will do the same ready for painting. Steven |
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