Originally Posted by theonecalledtom
Got my first quote today for CP replacements
. 2-300$ a piece depending on polishing which I was told is the most intensive part.
I'm looking to replace 6, so this is painful!
Talking a metal yard I can get enough 316 for the job (all 6) for $120.
Does the approximate quote seem a bit over the top?
No, not really. Besides being dead sure that the fabricator of the new chain plate
follows the constraints and requirements for hole placement and metal required between the hole placement and the edges of the chainplate - the polishing is really where all the labor is involved.
- - Stress analysis for hole and shape can be referenced from Brion Toss's Riggers Apprentice book - not a small tomb but contains all the information and formula for making a viable and serviceable chain plate
- - I normally polish all the stainless steel
myself starting with the rolled plate cut and holed to specifications. The polishing normally takes me almost a week to work my way from 120 grit down to 2400 grit polishing paper which yields mirror bright finishes. Skipping any steps doesn't work as you spend twice the time and paper trying to make up for the missed grit step. I do use orbital electric
finishing sanders and plenty of water
on the surface when I get down to the finer grades.
- - In other words, the finishing is very labor intensive and if purchased would be a major price
factor. If you do it yourself, your labor rate is zero so that cost is saved.