Originally Posted by SailboatRon
If I go back into freshwater I will have to have a ladder like this , if I launch her in the ocean this year I might not have passengers interested in swimming as much . I can build one out of steel
but it will rust badly so have not do so.
If you want to make one out of mild steel
, look into salt
bath nitriding. So long as the welds & base metal are okay with the heat involved in said process that is. And also, that you do ALL of the machining which you need to on it, prior to having it treated. As afterwards, such is nigh on impossible.
Said processes key perk (in this application) is it's virtual imperviousness to corrosion
. It's something which they do on high wear engine parts
, such as those associated with turbochargers & such.
Albeit the cost of said treatment may exceed that of having a custom fabricated stainless ladder made.
Regarding custom stainless fabrications done. A couple of tips:
- Have compression
tubes added through each rung, for the bolts of the teak
treads. They'll help with the load, but especially in maintaining the ladder as a sealed unit.
That, or if you prefer plain holes for such bolts, a couple of drain holes in the ladder's bottom might be wise.
- Get it passivated/passivate it.
- Welds are okay for a lot of work. But if you can swing it, fiscally, it might be worth looking innto having lugs added to each joint. So that the area of each connection is a lot bigger.
As stainless can be prone to cracking in welded areas which have repeated cyclical loading.
By lugs, I'm referring to those akin to old school
, light weight, steel, racing
bicycle frames. http://www.bing.com/images/search?q=...Lugs&FORM=IGRE
Lugs were/are commonly used to build such frames so that they can use much thinner tubing, & still have them hold up. Via the lugs spreading out the loads over more of the tubing at each joint.